RickTheEngineer
Member
- 231
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- 16
- Location
- Mount Laurel NJ
So I have this unusual situation. I was recently hit with some driveline vibration on my M1009, but it happened in a way that u haven't quite heard happen in the way mine did. At low speed (1-5ish mph) my truck as a noticable driveline vibration that shakes the cab enough for it to be heard and felt. I do have a 4" lift on it which might complicate things further, but please check out the details provided... I never had ANY vibration for the past 8,000 miles I have been using my truck post-lift install... It has a double caran driveshaft with the slip yoke. Here are some more details.
All new ujoints (8,000 miles ago)
New driveshaft (8,000 miles ago)
New output shaft seal (8,000 miles ago)
Ring and pinion look great (inspected 400 miles ago)
Tires balanced (no wheel weights missing)
Brakes are good (full service, drums and all 850 miles ago)
No strange differential noise (clicking, whirring, etc)
No grinding/binding sounds
No bent shafts
Ujoint bolts are tight
No rust around those spots
Could this be in fact a bad u joint? I did tow about 1,000 pounds for a 60 miles and it seems like it happened afterwards. Damaged ring/pinion? Only other symptom I can say really is that there is some tranny fluid around the body tub above the driveshaft joint closest to the front side of the truck (but what's even more strange is that whether I just drove or if the truck sits, there doesn't seem to be any sign of fluid leaking from the new output shaft seal I installed a few months ago, nor if the fluid right above it, it's above the joint, but the joint is dry?!). Anyways, sorry for the long post, I hope we can solve this mystery together.
All new ujoints (8,000 miles ago)
New driveshaft (8,000 miles ago)
New output shaft seal (8,000 miles ago)
Ring and pinion look great (inspected 400 miles ago)
Tires balanced (no wheel weights missing)
Brakes are good (full service, drums and all 850 miles ago)
No strange differential noise (clicking, whirring, etc)
No grinding/binding sounds
No bent shafts
Ujoint bolts are tight
No rust around those spots
Could this be in fact a bad u joint? I did tow about 1,000 pounds for a 60 miles and it seems like it happened afterwards. Damaged ring/pinion? Only other symptom I can say really is that there is some tranny fluid around the body tub above the driveshaft joint closest to the front side of the truck (but what's even more strange is that whether I just drove or if the truck sits, there doesn't seem to be any sign of fluid leaking from the new output shaft seal I installed a few months ago, nor if the fluid right above it, it's above the joint, but the joint is dry?!). Anyways, sorry for the long post, I hope we can solve this mystery together.
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