Well, life gets in the way. We've been building a house coming up on two years now, and we're still not done...
We never ended up going to EJS a few years ago, and so the clutch never got the attention it needed... the Comanche runs to town once in a while, and on an occasional forest service road around here. I have considered selling it, but my wife still objects.
This year, we have signed up for the Hole in the rock trail at EJS. Since it's a 3 day ride, with two nights of camping along the trail, I am really hoping to take the Comanche so we can stay in the roof top tent. More room in the back for our stuffs and the dog too, vs my TJ. I was hoping Frenchie would lead again, as he had previously approved the Comanche even though EJS says 33's and a locker are required, but another Moab local will be leading instead. I am hoping that he too will grant us permission to take the Comanche. As flexy as it is, I think the only thing that may pose a challenge is getting up the two ledges with so much rear overhang. I don't believe having 1" larger tires or a true rear locker will overcome the limitation of the long box rear overhang... I am sure that one of my fellow trail mates would be happy to offer a bit of assistance in the form of a strap, or at least be an anchor so I can winch up...
This MJ is open at both ends, and I have long wanted to have some sort of limited slip in the rear. It presently has a Dana 35 with factory 4:10 gearing. Being an early model, it has the larger drum brakes and bearing-retained axle shafts, rather than c-clips. As Dana 35's go, this is one of the better ones... I looked into doing an Explorer 8.8 swap, but I don't really care for the discs or their parking brake, and I don't have enough power to need the larger R&P. The nail in the coffin of that idea is that a 4:10 LSD Explorer 8.8's is ~$600 in my area. They also generally have 2-300k miles on them, meaning if I do find an axle with 4:10's and a limited slip, the limited slip will still need rebuilt anyway, as may the whole axle. Adding a spacer, an adapter for the driveshaft u-joint, new spring perches, and probably brakes and seals and a budget 8.8 swap comes out in the realm of $1000. Not gonna happen...
Since my Dana 35 is good, aside from having a bit of decel howl due to a lack of pinion preload, I decided putting some sort of LSD in the axle I already have was the cheapest and easiest plan. I considered just popping in a lunchbox locker, but I worry about the little Dana 35 shafts, and I really don't care for the popping and banging that seems pretty common when they are used behind a manual trans... An LSD made more sense as it's a bit less clunky on the street, and will hopefully keep us from breaking an axle shaft. I settled on the second cheapest option, a Grip PRO helical gear LSD from Powertrax. The cheapest option was a Traclok at about $330, while I paid $400 for the Grip PRO via 4 Wheel Parts. I would have preferred a Trutrac, but they were ~$150 more, and the Grip PRO works the same and has excellent reviews. Since this isn't a rock crawler by any stretch, I think this will be fine, and I'll be curious to see how the Grip PRO works. (No, I'm not sponsored, so I'll let everyone know if it turns out to be a POS.)
When I pulled the caps off the carrier bearings, the carrier pretty much fell right out. No preload left there... Not surprising for a 230k mile axle. I pulled the pinion and checked the bearings and both looked pretty good. I re-installed the pinion and tightened the pinion nut to get a minimal amount of preload on the bearings. Pinion rolls smooth, so that should take care of the decel howl.
Cleaned up and ready for the LSD...
Since this truck is 36 years old, I did take a bit of time to clean some surface rust out of the top of the axle tubes... I at least got all the chunkies out by pushing a rag through several times with a broom handle, and then blowing it clean...
I pressed new carrier bearings on the Grip PRO and installed the original ring gear onto the carrier with the original bolts and a bit of locktite. Actually used a torque wrench on the ring gear bolts...
I pushed it into the housing with new races and the stock side shims, and noted that it also had no preload... I checked backlash at about .001", which is not enough anyway. I added shims to the pass side pack until I had to work a bit to push it all into place. That put preload about where I like it, and I got between .004" and .005" of backlash. A bit under the recommended .005-.008", but good enough for the kind of work I do. I didn't bother to check the pattern, but with backlash in the ballpark, the pattern should be fine.
(Sorry, no pretty pic of the diff in the axle... My phone must have ate that pic...
I also confirmed that I would not need to do any grinding on the pinion, as the install instructions for Dana 35 units do say that some axles may need a bit of clearancing of the pinion to clear the case... This one clears, at least cold... If it rubs when hot, I guess it will self-clearance...
Next up, new bellhousing and a better clutch master/slave setup...