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I think you’re on to something here. The rear axles appear original, but I want to take the rear end apart and check each cv axle condition. I found an aftermarket cv axle that sounds like they use the rezepa style joint. I also see used axles on eBay for $120 each. Additionally, I thought I...

I tried adding both back in, separately and together. The trans damper definitely added a different, rpm related vibe back. The rear axle damper might have reduced the consistency of this speed related rumble/vibe. Right now, running the truck with the rear axle damper installed but no trans damper.

Love my Tdub for exactly the use case described here. Bring it with camping on the back of the truck and occasionally load it up for overnighters. It's a comfy mountain goat. Don't expect to cruise over 50mph though.

Hung ~290 lbs way off the back and the vibration is way lower maybe gone. So, either the lower ride height changes geometry enough to take the vibes away OR the bike acted as a big damper on the monocoque chasis

Pulled the second row seats and slept in the truck pretty comfortably in the desert. I'm 6'2" for reference. Truck towed a 1200lb trailer with two dirt bikes and all gear no problem up and down mountains. Upped the tire PSI from 31 to ~45 all the way around. Really increased the stability and...

Still working on this issue ya'll, just been busy with work and family. Thanks for the info, this is definitely something I'm thinking may be an issue. Since the rear is raised via a spacer, I'm wondering if the rear CVs are either worn, or at too high of an angle, or are aftermarket. I...

tested it out in AWD yesterday on dry streets and I think it drives smoother. Still some ruble from the rear end under load, buuuut, I think it's smoother. Based on this info, I'm going to try and swap out the rear diff bushings. For the center diff light blinking, it only happens after a...

Glad you didn't ruin the transfer case and you were able to make it work again. Thanks for the update

cool thread. I admire that you're modding your truck in a way that works for you while most of us would never dream of straying from stock. Any update on this?

Thanks for the FSM links. Had some rain yesterday and put it in AWD for a grocery store run, and noticed absolutely no difference. I did not take it on the highway though. I'll take it on the highway in AWD and see what happens

I've also got the center diff light blinking sometimes. Going to replace the 4x4 freewheel solenoid and see if there is any change. Another thread suggested the 4x4 solenoid malfunctioning could cause the 4x4 to engage when it shouldn't which could cause some driveline noise/vibes.

Motor mounts are difficult to inspect, but look pretty good: Rear diff bushings look suspect. But the front rear diff bushings are really tough to get a good look. I think this may be my issue:

Tires are new H/T tires from Falken. Installed at Discount tire. I've had unbalanced tires before, and this does not feel like that.

Drove about 30 minutes on the highway after an errand. Parked the truck on a level surface, put it in nuetral with parking brake on, kept the engine running. Tranny fluid was at just past the top of the "hot" mark. Slight oily smell, but super faint, and only if I put the stick or towel right up...

good info, thanks guys. I'll check my fluid level and color/smell and go from there.

Did you notice any difference in performance/feel?

Truck is brand new to me, haven't touched the tranny fluid. It's definitely on my maintenance list.

Great, thanks for the info. Might be next week when I can fully inspect. With these short days I have no light to work in after work. I'll keep ya'll posted

I'll take a peak at my engine mounts

Have not checked the engine mounts. It sounds like it's coming from the rear of the truck, so I didn't even suspect engine mounts. Is there an easy way to check the mounts?