Transmission slipping in and out of third

Asked by TSMPhillips Sep 08, 2017 at 10:53 AM about the 2000 GMC Yukon XL 1500 SLE 4WD

Question type: Maintenance & Repair

My transmission (automatic) started slipping in and out at about 35 mph. Once I hit about 45-50, it was fine. Had transmission rebuilt, and it kept doing the same after about two days. Replaced a barrel in transmission, after 24 hours, back to slipping. Completely replaced transmission with another rebuilt, drove about 360 miles (on a road trip... mostly interstate driving) and it started again. Not nearly as bad. Coming back home, in the middle of a nasty rainstorm that slowed interstate traffic to a crawl, it started slipping worse than ever. When the storm was over, and the truck seemed to dry out, it stopped for the most part. Back in town, it started slipping at around the same speeds (in and out). Now, when I come to a complete stop, it doesn't want to engage and I have to pull over and tap the gas until it engages and I can drive. Then it starts slipping in and out at the same speeds.
Seeing as how this is a completely different transmission, I feel that the issue isn't in the transmission itself, but something causing the transmission to start slipping gears. Also, It seems to be better when it is warm and dry. If it is moist outside, or cold, or hot, it starts slipping. Cooling temperatures, morning dew on the ground, and a couple of days of rain happened before it stopped engaging after a complete stop. This is why I believe that there is a moisture issue somewhere.
I really cannot afford a new transmission again, nor can I really afford to take it to a mechanic this time, so I'm hoping someone can give me some answers that won't be terribly expensive.

Just FYI, the transmission fluid has been fine every time it has been checked (This has been checked by my mechanic, myself, and the transmission mechanic several times.)

6 Answers

80

Did you ever find the real issue? Mine is doing the exact same thing.

8 people found this helpful.
90

My 2010 Yukon is doing it too. They want to drop the transmissions and look at first gear to see if there is a problem there. If there is not a problem, i'm out lots of money. I've filed a claim with GMC and am currently working with them to see if they can cover some of the cost. It's SO dangerous when it slips out of gear and cars are behind. The worst is when i turn a corner onto a main street and it slips into neutral. If anyone figures out what the problem, many of us would love to know. Thanks!

9 people found this helpful.
10

Any answers found? Ours is doing this exact same thing and we cannot afford a brand new transmission!!???

1 people found this helpful.
10

my 2000 is doing the same thing only at 45 to 50 mph when power is applied it goes away I sang a rebuilt tranny still doing the same thing as the original transmission with215,000miles did I gust spend 2000 for no reason??

1 people found this helpful.
20

has anyone changed out the electronic unit on the shift selector on side of trans? neutral safety switch, trans maybe isnt seeing the correct alignment of the gears electronically?

2 people found this helpful.

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