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I'm probably going to at least ATTEMPT to try and develop a homebrew TCU. But first, I'd like to have what the common issue with the TCU's, and what makes them $#!& the bed. Is it a hardware issue? Is it a software issue? Has anybody else attempted this? I am fairly new to this forum, and I'm sure a lot of you fellas have already looked at the threads way more than I have, but again, I'd like to troubleshoot the problem so I can decide how far I want to take this. If it works out, I'd like to post the entire process and open-source it so people don't get scalped on renix TCU's. A build list, an assembly guide, and a cost amount, assuming that this would come to fruition. Any help would be appreciated. Thanks in advance.

Alright so i’ve been preparing lately to drop an Ho motor in my 89, and so far the hardest thing has been finding a write up on the tps adaptor, the way I have done this modification requires no additional hardware, and uses unmodified Renix tps’s, while keeping the original amount of adjustment. Read Full Writeup Before Attempting To start you’ll need to take off the Tps connected to your renix throttle body. Next you will have to remove the arm attached to the throttle (see picture below) This can be difficult, I used screwdrivers to work it free, and then flattened the slight bends from removal in a vice. I then sized up the Renix arm I had just removed on the Ho Throttle body (where the Ho tps connects) I then filed down the shaft on the Ho Throttle body until the Renix arm fit ontop of it. (Note make sure the arm is clocked as shown, other positions will not work) Before After Then I tack welded it on to confirm it was in the correct location before burning it in completely After reaching this point you will need longer bolts and spacers to mount the Renix Tps to the Ho Throttle body. For bolts I found that the Ho map sensor bolts (located on throttle body) work perfectly. (see below) Finally For spacers I drilled holes in some 9mm Shell casings I had collected and they ended up being the perfect length without trimming (First remove primers by tapping them out, then drill) Finally bolt It all together and it should look something like this

Hey all, Here is the model and information you need to know about my Jeep. 1989 Jeep Comanche Eliminator, 4.0L Straight 6, Automatic Transmission, 2x4, I have A/C and cruise control. I have managed to complete my closed to open cooling system conversion. I did not spend a lot of money and I also did not go the cheapest route. I shouldnt have to replace any more water pumps or worry about cooling ever again. Here is a list of components that I bought: //////////////////////////////////////////////////////////////////////////////////////////////////// 2-Row Radiator - $100 https://www.amazon.com/gp/product/B01EVWTXLY/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1 Quality: 8/10 Functionality: 10/10 Comes with elbow and straight radiator cooling line fittings. Radiator Cap - $35 https://www.amazon.com/gp/product/B01F93S3E2/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 Quality: 9/10 Functionality: 7/10 It is very hard to turn on and off the radiator. 4' of 5/8" Black Heater Hose - ~$15 total Autoparts store 4' of 3/4" Black Heater Hose - ~$15 total Autoparts store (2) 5/8" to 3/4" Hose Adapters - ~$15 total Autoparts store One Gallon of Concentrate Coolant - $15 Autoparts store One Gallon of Distilled Water - $3 High Flow Thermostat Housing - $33 http://www.hesco.us/products/7882/cooling-system/133247/hi-flow-thermostat-housing-hfth2#.WRuBvWjyuwU High Flow 180deg Thermostat - $19 http://www.hesco.us/products/7969/thermostats-and-housings/43013/hp--gmfordamcjeep-thermostat-180-degree-4364#.WRuIYGjyuwU Thermostat Housing Spacer - $37 http://www.hesco.us/products/7969/thermostats-and-housings/43017/thermostat-housing-spacer-hesths#.WRuIiWjyuwU High Temp Blue Silicone Gasket Maker - $12 Autoparts Store Hi-Flow Water Pump w/ Gasket - $87 https://www.4wd.com/p/flowkooler-high-flow-water-pump-natural-1747/_/R-GNLS-1747 Hose Clamps - ~$10 Autoparts Store 6' of 5/16" Hose for Radiator Vent - ~$10 Autoparts Store (1) 5/16-18 by ~2" long (1) 5/16-18 by ~1-1/4" long *Not exactly sure on length because I gave up on using the housing spacer (I will explain later) *The housing spacer and thermostat housing comes with gaskets. Total: ~$396 Well worth it, will never have a cooling issue. Works like a charm. My Jeep is preventing global warming from happening. //////////////////////////////////////////////////////////////////////////////////////////////////// A few pictures of stuff I bought... Start taking off parts... I had to take off the supports on top of the radiator, loosen the belt, and accessory fan. See photo below. NOTE: See the square rubber supports on top of the radiator? You need to reuse those. Take them off and put them on the new radiator so you do not forget... :doh: At this point I drained the coolant and took off all the hoses and transmission cooling lines. There is no pressure in the transmission lines so no fluid should leak out! Here is my old radiator taken out of the truck. This also shows the fitting types for the transmission lines. See the bottom elbow transmission fitting? My new radiator came with a replacement. The stock one is one piece and not a swivel fitting like the new fittings. You MAY have to grind, file, sand, etc. the diameter of the new elbow fitting so the plastic quick disconnect fitting will slide on the new fitting. Either that or you can file the plastic piece like I did. See below. ^^ That plastic piece goes on the elbow fitting ^^ I found that there was two holes that did not line up to support the radiator...Both sides. So I zip tied them on. Not too important since there are other brackets supporting the radiator on the top. First issue I found with the housing spacer... The belt comes pretty close the to lower housing bolt. See below. Also you can see two brass inserts. That is a 1/4" plug on the right (wrapped in teflon tape) and 3/16" plug on the left. Normally sensors go there on the newer jeeps. The Renix older jeeps have the sensors elsewhere. Second issue because of stupidity (Halfway my fault). Hardware store worker said the housing bolts were M8-1.25. They are not... They are 5/16-18. So I stripped out the holes and the bolts. I said screw the spacer and used original bolts. Bad luck for trusting the hardware store kid. :fs1: A little fabrication was needed for the radiator cap on the support bracket. It comes pretty close. Also, the vent hose is a 5/16" hose. I re-purposed my coolant reservoir bottle for my overflow tank. I forgot to take a picture but the two heater hoses go straight into the heater core. This shouldn't affect the A/C as the heater valve is open when the A/C turns on. This info is straight from the Jeep service manual I have. Heat comes out of the vents when the blower fan isnt on which is the only case which could be bad... Heat could build up without the blower fan on and melt/overheat things in the HVAC. Other helpful things to note: Make sure to put fan belt shroud/cover on before the new radiator is in. Make sure to put the rubber supports from the old radiator onto the new radiator. !!!!!!!! LET THE SILICONE CURE BEFORE FILLING THE SYSTEM WITH COOLANT !!!!!!!! Feel free to message me for any questions about my experience with this upgrade. :cheers: :rock on: :clapping: :waving: . :MJ 2: .

1988, Comanche, Pioneer 4.0 L / 2WD / Long Wheelbase Build date: Sticker Un-Readable Current Location: South East, Georgia, Atlanta Status: Still on the road - no rust - Work in Process Notes: I purchased this from a guy who had 3 Jeeps - Cherokee and 2 Comanches. I own two 95 YJs that I have tinkered with that my kids now drive. I wanted a truck and something else to tinker with so, I thought this would be a good option for me. The previous owner did a ton of mechanical work on the truck. I have stripped down the doors and windows and replaced all the rubber and fixed the vent windows, Replaced the big front bumper with a stock one. Had the Jeep painted. I am currently working on the stock flares and brackets.... you know the drill and plan to get the front window frame powder coated - the paint I tried did not work well. What's Next... Replace Carpet Lettering on Tailgate Rear Shocks - The Jeep has a 4 1/2" Rubicon lift but has the stock shocks on the rear which are topped out. Idle Sensor Tinker with a starting issue. Doesn't crank on the first try - much prefers the second turn of the crank. Bed Liner Hitch or Rear Bumper w/ Hitch A/C has a slow leak Spare Tire Holder Cabin Lights Reverse Lights Emergency Brake Tool Box and what ever else comes up or I think is necessary or desirable... Mostly - Just have fun. :cheers: This forum has been AWESOME. There are some very talented folks and the information that is shared really helps us weekend tinkerers. A BIG "Thank You" to everyone who shares.

stock gear box cleaned Remove the four main bolts inside you’ll find the retaining clip on the ballbearing case the bearings travel side to side in I started out by pulling as many balls out as possible. I didn’t have a magnet on a stick so I glued a magnet to a stick. take the shaft side nut loose with a spanner I don’t remember the number of ball bearing. But did get a pic of the ball bearing size. In some of the case there is two different styles of bearings some chrome. And some dull finish. Mine had both styles alternating but the same size. use the cylinder to push the aluminum end cap out with a wooden hammer handle to pry with after removing the lock ring Remove the snap ring from the bottom . Pull the seal out and then press the old bearing out while you have it this far apart. My deal was melted from trying to get the pitman arm off. The spot to drill is pretty easy to find. The castings are flat in this area. drill into the veins of the box but not to far as to go through the other side. I used a 1/4 npt tap Then blow through the box a few times with compressed air and maybe oven pour some fluid through the holes and then hit it with some compressed air. When reassembling the most important part is the bearings on the worm screw. The need to be added evenly along the screw. I had to move it back and fourth a few times as I was dropping them in. I used a little grease to hold them inside the u shaped case And filled it up before sticking it back in place and fighting the bolts down if you get it back together and it moves for a moment then stops your bearings are out of wack. Take it back apart and make sure the bearings are in correctly

Hey guys! its been a while since I've been active on here and I wanted to give you guys an update on how mt build was going. So I've finally dropped the engine into the Comanche as of TODAY i have a few pics so ill start with that. ENGINE INSTALL: So I had decided to put the 4.0L I6 back into the car since the previous owner failed at doing a 4.3L v6 swap from a Chevy s10 (failed because he didn't put enough effort into the wiring and thus had several problems such as the entire gauge cluster not working, no high beams, and oh yeah, the thermostat was effed up and the heads blew) so once i finished absolutely gutting it, Ive been cleaning, painting, and buying parts for the new engine ever since. PLANS: I am going to finish up either this weekend or next by putting in the Aisin-Warner AW-4 four-speed automatic. I just need a transmission jack I need to swap the axles and do a whole suspension upgrade starting small with things like bushings and hardware. I plan on working my way up to stuff like shocks, coils, and eventually finding out how to get rid of leaf springs for something better. PROBLEMS: The. Seats. I have been looking up the bench seat to bucket conversion and taking the bench seat brackets seems not safe to me (probably because I'm an idiot lol). If anyone has any suggestions on that plz lmk. I've been looking at the threads as much as i can. The roof has been nothing but stress. I removed a god awful sunroof someone had put in even before the previous owner. I'm at the point now where if I see a Comanche at the junkyard i may just have to bring a generator and an angle grinder and take it.(also open to suggestions on this one please please) the heater core. on the donor xj i bought there was a really nice heater core and I messed it up trying to get it out. The bolts that hold it to the firewall were on too tight and when i began to pull it destroyed the plastic. For this I'm planning on trying out plastic welding it since the actual heater core is in excellent condition. just the plastic is messed up. The list goes on and on (as always). I appreciate all the elp you guys have been so far and I can't wait to keep adding stuff to my portfolio. I will try to post once a week but work and manche time take up most of my days. IMG_2334.HEIC IMG_2336.HEIC IMG_2337.HEIC

Since this has been a topic for a while I thought I would post my version for those that don't have access to a lot of special equipment. I had one good tailgate side insulator and one that was smashed.I removed the metal insert from the smashed one and cleaned it up. Made a plaster of paris mold of the good one. used silicon dielectric grease as a release on the rubber so it could be removed from mold, once mold has set up I drilled through original 3/16 to find center then removed original and drilled 1/2 hole through mold and inserted 1/2 dowel to support metal insert and used a small screw to hold insert to dowel, clamped dowel in vise to hold insert at proper height in mold, inside of mold and dowel get a lite coat of the dielectric grease as release, slowly pour FLEX SEAL LIQUID into mold till full I let it sit one week to fully cure. Both body side insulators were smashed so I cut one out of wood to form mold of it and poured that one today same process. This one turned out well and so far I have a $20 investment. I used FLEX SEAL LIQUID just cause its cheap but I believe windshield urethane would work as well and may set up faster. In pics original is on left FS part on right

Starting this post way late as I’ve owned the truck for 2 years almost and have done a lot to it already. So far I’ve done an engine swap (OEM motor blew #1&2 pistons out the block), new clutch, 4.5 inch lift, light bars, custom center console, window tint, paint, front and rear bumpers, ‘97 Cherokee mirrors, front and rear LED pods, rock lights, exhaust, LED front lights, converting everything to LED, clear turn signals and side markers. I still have a lot left in store for this rig such as a new 4.0l HO that I’m building with a voodoo cam (262/268), Dana 44 or Ford 9inch rear axle swap, and regear both axles to 3.73’s with ARB lockers, cromeolly axles, an 8 inch lift, slip yoke eliminator and longer drive shafts, bigger tires, custom rock sliders and fender flares, paint, new rear glass, front driver seat, new dash, floor pans, white face gauges. Not doing anything too too crazy as it will be a daily driver for a minute but any advice y’all got on parts or easiest and cheapest way to do it but still quality let me know thanks!!

DIY convert from closed to open cooling. This Write up is how I converted from closed to open cooling. You may choose other parts to achieve the same end result. I am converting because I am tired of messing with the pressure bottle, to remove the heater flow valve, and replace old hoses. Parts: Radiator with filler neck $82.57 * Part number: CU1193 Radiator cap $24.99 * (I bought a fancy cap with built in thermometer.) Part number: 2471S 2 Gallons antifreeze coolant $14.99 ea ($24.98 for 2) *** Item number: 7020022 10' 5/16 hose $19.90 *** $1.99 per foot Item number: 5194083 4' 3/4 heater hose $5.56 *** $1.39 per foot item number: 5192978 4' 5/8 heater hose $5.56 *** $1.39 per foot Item number: 5192951 Two 3/4 to 5/8 hose adaptors $2.99 ea ($5.98 for 2)*** Part number: 80424 A junkyard radiator bottle (I think mine was from a ZJ or WJ dad snagged it for me) Total conversion cost: $169.54 + S&H and tax Optional Parts: Later model thermostat housing with temperature switch new water pump Dual Fan Controller Second Electric fan for dual conversion Wire Relay or Fan Controller Power Switch MJ or XJ 2.5L Radiator Bottle $16.99 ** Part number: 52003213 MJ or XJ Bottle Cap $7.97 ** Part number: J3223202 Ordered from: Amazon.com * Morris4x4.com ** Advanced Auto Parts *** Tools: Gloves Safety glasses Knife or box cutter Phillips and flat head screwdrivers Bucket T-25 T-30 8mm Socket and or wrench 10mm Socket and or wrench Getting Started Start by draining out the old radiator fluid, removing the upper and lower radiator hoses, fan temperature switch, and if you have an auto transmission the transmission cooler lines from the radiator. Use an 8mm socket or wrench to remove the electric fan and clutch fan shroud. The radiator support is held on by several bolts 10mm and T-25 or T-30 (sorry mine where all stripped before I started not exactly sure the actual size). The bolts removed connect the support to the frame and front clip, then they are all out remove the radiator support. The radiator should come out without much fuss. With the radiator out of the way now would be the perfect time to convert to Dual electric fans and replace the water pump. Sadly I was running out of time due to fighting with stripped bolts so i was not able to do ether.... Depending on the radiator you get you may not need to change the thermostat housing. My thermostat housing is from a later model XJ, and can use a temperature switch. However the radiator I purchased has the hole for the fan temperature switch. Remove the 3/4 hose and the 5/8 hose from the thermostat housing and the water pump. Remove the old coolant pressure bottle and the hoses going to the heater core. Cutting the hose may be needed. The new hoses will need to be adapted from 3/4 to 5/8, the reason for this is the thermostat housing outlet is 3/4 connecting to the heater core that is 5/8, and the heater core outlet is 3/4 connecting to the water pump inlet that is 5/8. After all the old hoses are removed take your new 3/4 and 5/8 hose and route it however you like, then measure where to cut the hose in half. Use the 3/4 to 5/8 adapters as needed. Again the hose routing is: 3/4 from thermostat housing 3/4 to 5/8 adapter 5/8 to heater core inlet 3/4 from heater core outlet 3/4 to 5/8 adapter 5/8 to water pump The new coolant bottle is the next challenge. I ordered a 2.5L MJ/XJ coolant bottle that should fit on the drivers side fender, I will likely need to go back to a cone air filter to make room for it. Till I decide for sure what bottle I am sticking with I used one from a Junk yard Jeep and slightly modified it to work. I had to remove the old pressure bottle "shelf" to make room. I used a self tapping screw to attach the radiator bottle to the back of the engine bay where the old bottle was located. I routed the 5/16 hose around the back of the bottle and used the heater hoses as a bridge, ending where the radiator filler neck will be. Install the new radiator and reconnect the upper and lower radiator hoses. Reattach the radiator support. Connect the Coolant bottle hose to the filler neck. For good measure I zip tied all the new hoses in place. Fill the radiator system with 12 quarts (3 Gallons) of coolant. Must be a 50/50 mix, you can use pre-mix or concentrate with distilled water. you may not be able to fit all 12 quarts as there will likely be some coolant still in the engine. Bleed the air out of the system, Renix engines have a coolant temperature sensor on the back of the head accessible from the engine compartment. Clean up and all done Prior to this conversion My Jeep would boil over in 20 minuets and interstate travel was a no go. Now the temperature has yet to pass the 210 mark while traveling 75 mph on the interstate. A side note, my A/C seems to be blowing cooler as well now....

I just picked up a 2wd 88 eliminator and id like to do a 4x4 conversion. What all will i need to do to accomplish this task? I believe all i will need will be a front axle trans and matching t-case all linage involved a bell housing and a front driveshaft. Now this is my plan: I'd like to do a Dana 30 with 4:10 gear ratio, a bell housing from a late 93+ Cherokee with the external slave, an AX15 trans with matching NP231 t-case 23 spline, a new center console to account for the 4x4 shifter lever, and a custom front driveshaft. Now am i able to keep my original rear axle or will i have to swap that as well, And if i can keep it how can i change it to make it work with the 4:10 gear ratio i'm seeking? Let me know if i'm missing or forgetting anything. I'm also looking to give it a 3"-4.5" lift. With that lift what size tire would ​you recommend? I'm thinking of running 35's. ​​ :driving: