Engine/Transmission (1994 - 1998) 2wd grinding noise...

[9412v9824v]

so i put new carrier bearings in my 94 12v rearend... as i was talking about in another post... thats all set... now when i go down the road in 2wd there is a grinding noise which you can hear and feel in the floor boards... this only occurs when you are in 2wd and let off the throttle and coast over 20mph. now if you put it in 4wd... it doesnt do it... . i dont get it. . i have checked the vac lines i have checked the linkages the 2wd works just fine and so does the 4wd... so what gives?? i needa get this truck straight again... ive been working on it more lately then driving it!!!#@$%!#@$%!:-{}:--):--)

 

[NIsaacs]

As a general rule, when carrier bearings go bad, it is over a period of time. During this time of bearings failing, the ring and pinion run in a miss-matched condition damaging the gear pattern.



When you fix the bearings, the carrier and ring gear are now ridged, the gear pattern is still off and can't be fixed without a new set of gears. The noise in 2wd goes away when you put it in 4wd because the slack of the rear axle is now snug due to a slight binding the front axle causes.



Nick

 

[9412v9824v]

ok so i need to use the truck... am i ok to use it? jus gonna b noisey?? also the noise in 2wd only happens when your coasting. . if your on the throttle. . no noise... but when you coast. . there is noise... also the noise doesnt seem to b coming from rearend (like when the bearings went) seems like coming from tcase area?? i can also drive dwn the road in 4wd and pop it in 2wd and as long as i stay in gear coasting or not it wont make the noise in 2wd till i stop and change gears. but none the less there is no noise in 4wd at all. also if you drive down the road in 2wd... coasting listening to the noise and you pull 4wd lever back as if you were gonna pop it in 4wd (but dont pull it back far enough to engage 4wd) the noise then stops also... ughh help. . lol

 

[NIsaacs]

Drive train noise can be hard to pin down. The noise can travel. If you have a manual transmission I would drain the oil and look for contamination also the transfer case. Try to rule out any of the gear boxes you can, to help narrow your search.



If it is the rear axle causing the noise, and if it is just miss-matched ring and pinion pattern, you can drive it, noisy and all. They can run a long time if you don't tow. Also use 85/140 gear lube. Did you change the pinion bearings? They will be damaged from the oil contamination of the failed carrier bearings.



Nick

 

[9412v9824v]

well towing and plowing is this trucks point... lol its a workhorse... also the noise isnt coming from the rearend... there is a slight vibration under the driverside floorboard. . when the noise occurs... and you can tell noie is coming from the front sector of the truck. i already drained and refilled auto transmission i already drained and refilled both front and rear axles next i will drain tcase. as i think thats where ima have my issue.