Grinding/vibration at speed on coast or deceleration
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Three Wheeling
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Grinding/vibration at speed on coast or deceleration
All,
Bought and swapped in a used transfer case and f/r diffs to replace older worn ones on my D1 from someone on Dweb. Ever since I've been having issues with noise/vibration on declutch (it is a manual) and when decelerating in gear. Although it seems to have gotten worse recently. This was not happening before the swap. Cases below.
1) Accelerate at low speeds with no issues. Get to highway cruising speeds in fourth gear. Clutch in. Immediate noise (sounds almost like very fast grinding). Slot into fifth gear clutch return. Noise goes away immediately. Same thing happens going down from fifth to fourth or fourth to third.
2) in fifth gear cruising. Take foot off gas and start decelerating. Not touching brake or clutch (still in gear). Same grinding noises but with vibration. You can feel it in the pedal assembly and front floor (although I have no carpets). This occurs in both third fourth and fifth gears but mostly at speeds above 40mph.
I have done some initial investigation. Remove front DS drive around and try to replicate. Issues above remained. Replace front DS then remove rear DS and attempt to replicate. Issue 1 seemed to go away. Issue 2 was mitigated and I was only able to get it to occur during engine braking once and only briefly.
Therefore, i suspect something between the rear transfer case and the rear diff. I checked the preload on the pinion and the rear output flange with a torque wrench to RAVE spec and both were good. U-joints are old but I dont see any slop or play.
What next? Any suggestions for further analysis before I start guessing? Sound like any issue you've had before?
Bought and swapped in a used transfer case and f/r diffs to replace older worn ones on my D1 from someone on Dweb. Ever since I've been having issues with noise/vibration on declutch (it is a manual) and when decelerating in gear. Although it seems to have gotten worse recently. This was not happening before the swap. Cases below.
1) Accelerate at low speeds with no issues. Get to highway cruising speeds in fourth gear. Clutch in. Immediate noise (sounds almost like very fast grinding). Slot into fifth gear clutch return. Noise goes away immediately. Same thing happens going down from fifth to fourth or fourth to third.
2) in fifth gear cruising. Take foot off gas and start decelerating. Not touching brake or clutch (still in gear). Same grinding noises but with vibration. You can feel it in the pedal assembly and front floor (although I have no carpets). This occurs in both third fourth and fifth gears but mostly at speeds above 40mph.
I have done some initial investigation. Remove front DS drive around and try to replicate. Issues above remained. Replace front DS then remove rear DS and attempt to replicate. Issue 1 seemed to go away. Issue 2 was mitigated and I was only able to get it to occur during engine braking once and only briefly.
Therefore, i suspect something between the rear transfer case and the rear diff. I checked the preload on the pinion and the rear output flange with a torque wrench to RAVE spec and both were good. U-joints are old but I dont see any slop or play.
What next? Any suggestions for further analysis before I start guessing? Sound like any issue you've had before?
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TRIARII
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Nov 5, 2013 01:37 PM
