99 Silverado trans problem

[inafogg]

hello everyone,thanks for taking the time.i'll try to keep it short.99 silverado 5.3L/106k 4 wh 1500 series.son n law down the road possibilties
anyway he was having rear trouble ck out was told a gear or bearing
bad ok to drive till get parts?????no it was'nt blew the rear.after replacing rear w/used w/100k there is a vibration that gets worse w/speed from rear of car(can be felt in seat back)& there is no drive unless you manually up shift then trans shifts properly up/down until you stop.
i'm thinking maybe a balance issue w/drive shaft for the vibration but
dont no about the no drive problem.Thanks Again Mike
BTW after the rear locked up he put it in 4 wh & i guess dragged the rear???a couple of miles!!!!!

[Reflash]

The vibration sounds like U may have changed the pinion to drive shaft angle...is the replacement rear axle centered and properly located on the pins under the leaf springs? Just a WAG here, but if the vibe started after the rear axle was replaced, I'd go back and inspect all the work that was just done.

As for the trans...can u explain with a little more detail? U say there is no drive?...meaning when U first start off from a stop and the trans range is in D1 or OD1, does the truck move? And then it moves if U manually move the shifter to manual 1/lo and manually up shift for each gear? If that is the condition, most likely the sprag in the input hsng failed.

[j cAT]

Originally Posted by inafogg

hello everyone,thanks for taking the time.i'll try to keep it short.99 silverado 5.3L/106k 4 wh 1500 series.son n law down the road possibilties
anyway he was having rear trouble ck out was told a gear or bearing
bad ok to drive till get parts?????no it was'nt blew the rear.after replacing rear w/used w/100k there is a vibration that gets worse w/speed from rear of car(can be felt in seat back)& there is no drive unless you manually up shift then trans shifts properly up/down until you stop.
i'm thinking maybe a balance issue w/drive shaft for the vibration but
dont no about the no drive problem.Thanks Again Mike
BTW after the rear locked up he put it in 4 wh & i guess dragged the rear???a couple of miles!!!!!

sounds like the rear diff is in need of pinion bearing or sleeve wear...

transmission has no up shift ? I would check for DTC of drive train to determne why...

does this vehicle get regular maintenance`,,,sounds like not..
transfercase/transmission/rear diff need frequent servicing...also no operation of the 4X4 on solid dry pavement...

[sierra99]

Originally Posted by inafogg

hello everyone,thanks for taking the time.i'll try to keep it short.99 silverado 5.3L/106k 4 wh 1500 series.son n law down the road possibilties
anyway he was having rear trouble ck out was told a gear or bearing
bad ok to drive till get parts?????no it was'nt blew the rear.after replacing rear w/used w/100k there is a vibration that gets worse w/speed from rear of car(can be felt in seat back)& there is no drive unless you manually up shift then trans shifts properly up/down until you stop.
i'm thinking maybe a balance issue w/drive shaft for the vibration but
dont no about the no drive problem.Thanks Again Mike
BTW after the rear locked up he put it in 4 wh & i guess dragged the rear???a couple of miles!!!!!

I just had my tranny replaced and had a similar vibration. I took it back to the mechanic and we saw that the rear u-joint has 2 clips on them to properly center the drive shaft into the rear pinion. My clip was rusted away and when put back in, the driveshaft was about 1/8" inch off center. We added a new clip to the u-joint and all is good again.

Check that first. Hopefully that is it. Post what you found. Later