Eagle

3-foot length of 5/8" or 3/4" heater hose. Hold one end to your ear, move the other end around until the noise is loudest. That's your leak.

He is remembering incorrectly. Jeep never offered a limited slip in the front Dana 30. Not in the XJ, not in the MJ, not in the ZJ. Maybe his dealership was installing them as a dealer option, but it was not a factory option. I think a front limited slip would create some real handling problems in snow or ice.

#21 should do it for you. You will need to make a tool for installing it. What some people do is take a length of threaded rod and attach a few VERY LARGE washers to the end. Slide that into the axle tube from the outer and and use that to tap the new seal into place.

2001 Cherokee. On stock 225/75-15 tires the speedometer was off by about 2 MPH at 70. Speedo read faster than actual speed. It's now running on 235/75R15s and the speedo is dead nuts accurate at 70 MPH, confirmed by GPS. So one tire size makes a difference of 2.86%. In terms of engine RPM, we're talking in the vicinity of 2250 RPM, so the one size difference works out to 64 RPM -- at 70 MPH.

I sort of remember that I may have posted a link to my tire/gear/road speed spreadsheet on Google Docs awhile ago. Long enough ago that (if I did it) I no longer remember the link, or the user name and password I would have used for Google Docs. If anyone remembers seeing it, or has it bookmarked, please post the link. Mine offers two advantages: First, it gives you RPMs for both 4th gear and 5th gear. Second, the RPM calculations are based on actual tire manufacturers' revolutions per mile, so they are much more accurate than calculations based on theoretical tire size (which is what pretty much everyone else is doing with their on-line calculators and tables).

It sounds to me like you need a new radiator. The fact that the temp goes down when you turn on the heat is a clue. After all, the heater core is just a small radiator. If running coolant through that lowers the temperature, that pretty much tells us that the radiator isn't doing its job.

Clutch. Flywheel. Clutch shudder is often (usually?) a result of someone slipping the clutch too much, causing hot spots on the flywheel. The only real cure in that case is to replace the clutch and the flywheel, or have the flywheel resurfaced (the latter being a severe NO-NO for the 4.0L flywheel but is apparently okay for the 2.5L flywheel).

AX-15 with 3.55s? You swapped axles? My '88 was barely passable with 3.07s and 31s. 3.73s were better, but basically equal to stock with 3.55s. You'll be able to drive yours, but you'll be doing a lot of clutch slipping and downshifting for hills. It will be far from ideal. You really need 4.56s for 32s and 4.88s for 33s.

An AX-5 would be WORSE. The first four gears in the AX-5 are the same as in the AX-4. Fourth gear is direct drive (1:1). The AX-5 adds an overdrive gear. On 33-inch tires with 3.55 gears you will NEVER be able to use fifth gear, not even downhill with a tail wind.

I ran my '88 MJ with 3.73 gears on 31x10.50s, and my wife's "car" was a 2000 XJ Classic, totally stock (automatic with 3.54 gears). The overall final drive ratio, as expressed in RPMs at 60 MPH, was exactly the same for the MJ as for the XJ. IMHO 31's with the 4.0L really should have 4.10s. I installed the 3.73 gears because I had already bought them -- but I bought them with the intention of running them on the '88 XJ with 30" tires.

To most of us, "column" refers to the steering column, which happens to be where your transmission shifter is located. The 4WD shifter would be referred to as a "lever."

With the truck loaded (or unloaded) as you will normally drive it, crawl under and measure the distance between to lower and upper shock mount studs. Then go to the Monroe shocks web site and find their on-line catalog. At the back is a chart that lists the dimensions and mount types for every shock they make. Look for one with eye mounts top and bottom and lengths such that the measurement you took off your truck is at the mid-point between the compressed and extended length. That will give you a shock part number. You can then cross-reference that part number to find what make and year vehicle it fits. Once you know that, you can use that info to order any brand socks you like.

I wasn't happy with 31x10.50s behind a 4.0L and stock gears, although mine had 3.07s. I regeared to 3.73s because I had them, but 4.10s would have been better. I also have an 88 2.5L 4-speed with 3.55 gears. I can't believe you even drove it on 31s, and I'll virtually guarantee you that you aren't going to like it on 33s. You need at least 4.10s, and maybe 4.54s or 4.88s.

I'm confused by the original post. The column shift controls the transmission, not the ntransfer case. It has nothing to do with being in 2WD or 4WD. That said, I'm inclined to agree that the front axle disconnect probably isn't functioning.

You do NOT have an "overflow" tank. you have a pressurized surge tank. Do NOT fill it more than halfway when cold, and do not remove the cap when hot.

Burping is for the Renix-era closed system, not the later open system. We still don't know what year this truck is.

I believe you can buy "power chips" to fit the OBD-1 HO engines. I know they are available for the 4.0L engine in the ZJ grand Cherokees. However, every review I've seen (disclaimer: I haven't looked at this for several years) reported that it was necessary to run premium gas with the power chip installed. So you get more power, but you pay for it. With gas hovering around $4/gallon for regular, personally I would not be in a rush to install a mod that requires me to spend an extra 30 or 40 cents per gallon.

I would try to grind a flat surface. The u-bolts are much stronger than the straps.

He didn't ask about updating an 89 into a 99, he asked about making the 89 4WD. I agree with benjy_26 that an earlier year would be a better donor for the conversion, but if he already has the 99 he can do it.

This thread is about a Dana 35 rear axle. Your question is about a Dana 30 front axle. They are completely different. I believe you have an older front axle with the passenger side disconnect. If that's correct, there is no seal at the diff housing on the passenger side -- the seal is located at the point where the disconnect housing is located, so diff lube can lubricate the sliding disconnect mechanism. Since you already have another thread open to discuss your problem, I'm closing this one.

(1) There is no rear Dana 30 axle -- at least, not in a Jeep, and not in any other vehicle I ever heard of. (2) Jeep never offered a locker in an XJ or an MJ. They offered as an option a limited slip for the rear axle, but not for the front. I suspect you must have an older MJ with the front central axle disconnect. It's not a locker, all it does is allow the two front wheels to rotate independently, which leaves the differential and front drive shaft doing nothing when in 2WD mode. I'm pretty certain the seal you need is one of these: http://www.autozone.com/autozone/parts/1989-Jeep-Comanche-4WD/Axle-Shaft-Seal-Front/_/N-iuaiqZ6o3am?filterByKeyWord=front+axle+seal&fromString=search Note that some say they are for the "disconnect" axle, and some are not. I believe you have a disconnect axle, so look at those listings and tell us if one of them looks like your old seal.

We NEED to know what year this truck is, because the auxiliary fan operation is different between the Renix-era models and the later HO models.

You are correct in what it does. It was for the Renix models only. For the HOs, the ECU handles that function. I don't think it adds any power or torque, unless you run mid-grade or hightest gas. The Renix engines have a knock sensor to retard the spark when they sense detonation. And that usually happens under load. What the high altitude CPS really does is allow more advance under light load, which boosts the fuel economy.

They don't fit. Once again, the XJ rear wheel opening is smaller in both length and height than the MJ. 2-door and 4-door XJs have the same wheel opening and take the same flares.

Are those still available? I thought I bought the last one in captivity about four years ago.