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Tahoe & SuburbanThe power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.
We were on the way home from camping today (not towing) when my Suburban seemed to start shifting late. It was fine on the way out and about halfway back. We went through a drive-through to get something to eat, when it started happening. I never shut it off the whole way home. And if I ease off on the gas, it'll shift.
A couple of notes:
While sitting in the drive-though line, I noticed a slight, occasional stumble while idling in line. Related?
Tranny fluid is relatively new. It was serviced not long ago. The shop dropped the pan went through it and said the tranny was in pristine condition. No shavings or anything, so they just refilled it.
Last edited by PapaHepcat; September 20th, 2015 at 9:37 PM.
Maybe it was just a fluke. I drove it some more, did a test tow last night, and everything seems normal. Checked the fluid level and it was fine. Maybe slightly overfull.
It's possible that the pressure switch manifold in the transmission is bad. It's an inexpensive part but requires the pan be dropped. It's bolted to the valve body.
We were on the way home from camping today (not towing) when my Suburban seemed to start shifting late. It was fine on the way out and about halfway back. We went through a drive-through to get something to eat, when it started happening. I never shut it off the whole way home. And if I ease off on the gas, it'll shift.
A couple of notes:
While sitting in the drive-though line, I noticed a slight, occasional stumble while idling in line. Related?
Tranny fluid is relatively new. It was serviced not long ago. The shop dropped the pan went through it and said the tranny was in pristine condition. No shavings or anything, so they just refilled it.
Ended up needing a transmission rebuild in the end. It mostly was fine for a little while after this post, but then stopped shifting into 4th altogether about a year later. We did a heavy duty rebuild since we tow a lot, and it's shifted perfectly since then. Local shop did it for about $2,300, which I thought was a great deal for a rebuild.
Side note: the occasional stumble during idle was completely unrelated. Replaced the spark plugs with ACDelco Rapidfire plugs, and the wires with MSD wires .Stumble cleared that right up and gave it much more power.
Still have the 'burb. We've done a ton of work on it since then.
Last edited by PapaHepcat; September 26th, 2019 at 3:38 PM.
September 20th, 2015, 8:55 PM
1999 Suburban shifts late / high rpm
