gtrobb
Member
- Joined
- Jul 6, 2005
- Location
- Lenoir, NC
Loaded up the mower on the trailer and took off this afternoon...I pulled off from a stop sign and SURPRISE! A severe grinding noise and slight vibration from under Tahoe (1999 4dr).
First I had EVER heard anything like it or any other odd noise from underneath. Tahoe is driven every third day or so - I drove it a couple of times Sunday with the window down and didn't hear or notice anything.
When I heard the grind today, I stopped but it wouldn't move in reverse...I moved forward 4 feet, then reverse was fine (noise and grind still there).
Tranny fluid is full, clear red, and smells fine...just had it flushed with new filter/fluid about 12k ago. It's push button 4wd - put it into 4lo and VERY LOUD GRINDING when I moved forward...and a pronounced clank when it returned to 2wd. Grinding was still there in 2wd, but significantly less than 4wd.
I did some research tonight, and found two possibilities:
1. Fluid = newer GM TSBs recommend the AllTrack II Synthetic lubricant (Blue) rather than the old Dextron III (Red). It has a 2 qt capacity, but I am going to get 4...2 to use for a couple days to flush, then two more for a second change.
http://www.automotivehelper.com/topic535831.htm
2. Snap ring in tail shaft of tcase is prone to breakage...here's a link:
http://www.chevytalk.org/threads/sh...Words=grinding&topic=&Search=true#Post1567483
Any other ideas? I'm thinking $30 in fluid and a $3 snap ring is worth the effort before I take it to a mechanic.
First I had EVER heard anything like it or any other odd noise from underneath. Tahoe is driven every third day or so - I drove it a couple of times Sunday with the window down and didn't hear or notice anything.
When I heard the grind today, I stopped but it wouldn't move in reverse...I moved forward 4 feet, then reverse was fine (noise and grind still there).
Tranny fluid is full, clear red, and smells fine...just had it flushed with new filter/fluid about 12k ago. It's push button 4wd - put it into 4lo and VERY LOUD GRINDING when I moved forward...and a pronounced clank when it returned to 2wd. Grinding was still there in 2wd, but significantly less than 4wd.
I did some research tonight, and found two possibilities:
1. Fluid = newer GM TSBs recommend the AllTrack II Synthetic lubricant (Blue) rather than the old Dextron III (Red). It has a 2 qt capacity, but I am going to get 4...2 to use for a couple days to flush, then two more for a second change.
http://www.automotivehelper.com/topic535831.htm
2. Snap ring in tail shaft of tcase is prone to breakage...here's a link:
http://www.chevytalk.org/threads/sh...Words=grinding&topic=&Search=true#Post1567483
Any other ideas? I'm thinking $30 in fluid and a $3 snap ring is worth the effort before I take it to a mechanic.
