i have a 97 chevy suburban k2500 4x4... and i have 2 noises i can't figure out...

1. when i drive uphill i hear a clunk... and a slight jerk. (i don't think i loose power nor do i feel the transmission getting out of gear... but maybe its trying too??

2. when i go down a hill and try to slow down with the tranny in 3rd gear... it will slow for a bit, but then i hear a winding or possibly spinning noise. When this happens the RPMS drop from approx 3k to about 1k and it feels like it is coasting in neutral. when this happens if i hit the accelarator it goes back to normal. if i brake with brakes the downhill symptoms don't occur.



i suspect the 2nd item is related to the tranny.... but does anybody know if this will require an overhaul of the tranny? or is it recommended? or is it something simple like a sensor??

the first item... i have no idea what it might be... does anyone have a clue???? do you suppose this will go away if i overhaul the tranny??


in addition to the above i should mention that everything functions perfectly under no load in flat areas. shifting is no problem... i can hit 90mph without any issues... symptoms only occur if it is a steep uphill or downhill.

please send me some advice.....
i don't mind spending $1k to overhaul my tranny if the symptoms will go away.

thanks in advance


dave

Was this ever resolved? My 96 Suburban is doing exactly what you described.

i had the same problem on my 91 chevy g20 5.7L automatic,

i pulled a heavy load trailer with my van and something started whining and clunking in my case i though it was the tranny i took it to the mechanic and they told me it was a bent frame haha vans have a unibody, looser mechanic, i took matters into my own hands and all it ended up being a bad ujoint make sure to check both the front and back ujoints on your truck.

While searching old threads for suggestions is a good idea, please avoid resurrecting them by adding replies. This thread was started over five years ago.