The clunk thing

[Deigo]

i was going to ask about the clunk too. when im in low and shifting between drive and reverse there is a cluck and jerk. i twisted the drive shaft by hand and there is about a quarter inch of play, so i assume the clunk is the drive shaft twisting free before catching and that low range amplifies the jerk by applying more force( torque ). i was thinking worn u joints, but could you explain axle wrap as this may be the problem.

[WILLY]

Well i too have the sprung energy thing after releasing the brakes and i have thought it might b the brake callipers,my callipers although securely bolted on have a small amount of play in them when grabbing them and jerking front to back so i thought they might be being drivin forward when braking to a stop and then when the brake is released they spring back, idunno just a thought.

[tom4bren]

I guess I used the term axel wrap too generally. When your vehicle 'stands up' with the parking brake applied, the same forces are at work, just not to the same extent.

"Wrap-up - Referred to as both rear spring and rear axle wrap-up. As power is applied, torque load causes the rear pinion to pivot upward. Once this load reaches a certain point the leaf springs begin to deform, which stresses numerous driveline components. The "fix" is to increase spring strength, via add-a-leafs, or install traction bars."

I know that this definition is for leaf springs but similar effects will be in play with coil springs. Remember when Kicker shocks, sub frames & ladder bars were the 'all the rage' with agressively lifted trucks? Those were all cures for axel wrap (wheel hop) just like steering stabalizers were supposed to stop 'bump steer'.

[Solitude]

There is a TSB that says the clunking is normal.. Mine has clunked since it was brand new

[MoonRaker]

Well, theres all kinds of stuff that can clunk. Its the how bad is it or is it getting worse that you need to keep an eye on. If you run the the VX hard, things are going to wear alot quicker. I think im going to start buy making more of the shims I mentioned before and do part buy part while testing in between. Im still waiting for the clutch pack wich is on back order from isuzu. Id recomend that the guys that own one and plan on keeping it on the road withought a long wait start collecting parts. Were lucky that the tranny parts are readily available since its a common tranny but what about diff parts. Has anyone looked into diff parts? I havent had the time to pull any schematics yet.

[Ldub]

Well, theres all kinds of stuff that can clunk. Its the how bad is it or is it getting worse that you need to keep an eye on. If you run the the VX hard, things are going to wear alot quicker. I think im going to start buy making more of the shims I mentioned before and do part buy part while testing in between. Im still waiting for the clutch pack wich is on back order from isuzu. Id recomend that the guys that own one and plan on keeping it on the road withought a long wait start collecting parts. Were lucky that the tranny parts are readily available since its a common tranny but what about diff parts. Has anyone looked into diff parts? I havent had the time to pull any schematics yet.

For the rear diff., I just ordered...

L & R bearings, a complete set of shims, & 12 ea. ring gear bolts.

All ordered from Merlin, we also talked about pinion bearings, shims, seals, & crush collar.
There was no mention of any of these items being on back order, but I won't know for sure until they do, or don't, show up next week.

[MoonRaker]

All the seals and bearings shouldnt be hard to find what im worried about is all the gears to include the pinion. Ask if there available if you dont mind.