My '99 Yukon's trans has an adaptive mode. (Factory tow package) When trans
goes through a few heavy throttle shifts it automatically goes into a tow
mode that firms up the shifts. Stays in that mode until ignition is cycled
off.
When I first got the truck I thought the trannie was taking a dump but a
little reading filled me in on it.
Newer trucks now have the tow / haul button on the dash to eliminate the
annoying adaptive mode.
"Skip" wrote in message
>I bought this suburban and love it. 124k Miles. The engine is great and
>smooth running and the trans shifts great in normal load conditions but I
>live in Atlanta and get stuck in traffic to and from work and when this
>happens under light load the shift from 1st to 2nd seems a bit hard
>sometimes and I feel fair jolt/quick push forward. All other gears are
>fine! I'm wondering if its just the trans getting old or if it is something
>else.
>
> History
>
> Purchased it from the original owner. It was his wife's suburban and I
> know this lady and she baby's her vehicles. This fluid was changed once at
> 40K miles and I just changed it with fluid/filter and a new filter gasket.
> The gasket was a trick to be pressed in but I'm a fair mechanic and was
> able to replace it with a good fit flush to trans housing. The filter went
> in good and its good and tight fit in the gasket. I cleaned the pan well
> and reinstalled the original magnet after cleaning. The magnet was covered
> with very fine paste but this build up was normal for a vehicle with this
> millage. No leaks before or after.
>
> Thanks in advance!!
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