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Everything posted by mnkyboy
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You definitely want a full SYE kit for the strength upgrade, the stock output is pretty weak, a doubler would be really pushing it past its limits. I used cable shifters from JB Custom Fab, i set them into the floor when i made the new tunnel for the flat belly/tummy tuck.
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
- 798 replies
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- 2.5l
- supercharged
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It will typically lengthen the front shaft and shorten the rear shaft, how much depends on the crawl box/t case combo you go with. On an XJ that already has a very short rear drive shaft i think you would want to stretch it a bit to help make up for the crawl box.
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
Looks like the smaller pulley got me 7psi, it seems to like it.- 798 replies
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- 2.5l
- supercharged
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My 231 has been ok behind the crawl box so far but it has a SYE, 1.25" chain and 6 pinion planetary so It's basically running 241 guts. I wouldn't want a stock 231J behind a crawl box but some people get away with it for a long time. Behemoth seems to be doing much better than they were before Jacob vanished for a while, but they still have a lot of work to do. My brother has ordered some stuff recently and everything has shown up as promised, but it took forever to show up and came with the usual list of excuses that Behemoth is known for. NWF has been on point with everything he has ordered, definitely the better company to deal with.
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The Behemoth is a nice box, downside is Jacob at Behemoth has had some big issues with getting product out so it may take a while to get it. The other option is the NW fab ECO box, It's a little more money but they will be much easier to deal with.
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A 4:1 in a 231 has a hard time staying together in a single case, the weak planetary would be a grenade in a doubler set up.
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I run a Behemoth crawl box in front of a built 231 in my MJ, with an AX15 and 5.38s it puts me around 152:1 Functionally my box works identical to the 231 crawl box that Kris is selling in the link you posted, mine is just a bit fancier.
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
Today i finally swapped out the old leaky header, the truck sounds much better and my wideband looks to be happier too. I also tossed on the new supercharger pulley, i only drove it out in front of the house but it feels like it pulls a lot harder.- 798 replies
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- 2.5l
- supercharged
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Anybody running Split Second ECU?
mnkyboy replied to Jacob Ochs's topic in MJ Tech: Modification and Repairs
You could talk to Ryan Hogan at Flyin Ryan Performance, he can tune the 96 up ECMs for boost. http://www.frptuning.com -
Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
The supercharger and intercooler sitting on top of the intake is the biggest reason that i did it to the new one. On other vehicles i typically don't worry about wrapping them.- 798 replies
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- 2.5l
- supercharged
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
My 1st header lasted over 10 years with wrap on it, it ended up cracking one of the tubes but there's not really any rust on it. Heat is actually a bigger issue than moisture, since the wrap holds the heat in the pipe you end up over heating the header pipes which ends up hardening the metal making it more brittle, you typically get cracks rather than rust. It does however help keep the heat out of the engine bay, you will also get a minor performance increase from the higher exhaust velocity due to the hotter exhaust gasses. Like many things, it's a trade off.- 798 replies
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- 2.5l
- supercharged
- (and 7 more)
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
Finally got around to prepping the new header for the MJ, i got the additional O2 sensor bung welded in for the wide band and got the header wrap on. Now to get it installed on the truck.- 798 replies
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- 2.5l
- supercharged
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Sweet deal, they knocked $40 off an air tool I had been thinking about getting.
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Most of it is, there's a couple spots in the drivers floorboard that will need patched. I have a pretty good selection of metal working tools/machinery and the boy likes metal shaping so it will be a fun project for him.
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Today we got most of the interior out and pulled the rubber mat out so that we could take a look at the floors. Perfect floors would have been nice but compared to what many people find, i would say it's not too bad.
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
- 798 replies
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- 2.5l
- supercharged
- (and 7 more)
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Haven't updated in a while, the boy got the 6.5" lift and axles installed, finally got the front one in today. He also worked a deal and bought a 1990 MJ shell with a 4.0l, AX15, and a bunch of other parts that he plans to swap into the 87.
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Mnkyboys 89 Comanche project
mnkyboy replied to mnkyboy's topic in MJ Hardcore Tech: Epic Journeys to Greatness
Not much for updates,other than driving the truck a bit not much has changed and i still have a small list of things i want to get done. The other day my boy made me a hood ornament, he might make another that's a little larger but it looks pretty good on the MJ.- 798 replies
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- 2.5l
- supercharged
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The gear cut changed around 93 so you have to be careful swapping inputs, you can't mix early and late parts. You should be able to convert a 96 case to 21 spline by using an input from a 94 or newer 231 from a 2.5l rig.
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The 242 would need to come off an 87-90 AW4 to get the 21 spline input to fit an AX4/AX5
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1994-1999 AX15s will have the external slave bell. You will also need an external slave front bearing retainer for an AX15,a clutch fork and retaining clip for a 94 up AX5 or AX15, then your throw out bearing, and clutch hydraulics.
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I really like my little 2.5l, i used my MJ as a daily for years before i decided to go crazy with it, it has always been very reliable.
