Trying to troubleshoot transmission issue.

[SupaDJ]

Hey forum, first-time poster. I recently bought a 2003 Yukon SLE with 162K miles. When I take off from a dead stop it takes off like it's in a low gear. It shifts to the proper gear within 30 seconds. The car runs fine on the freeway. If I start in 2nd gear it takes off normal. when I shift from 2nd to 3rd it jumps a little. Shifting from 3rd to Drive is smooth. I was going to swap the TCC sensor, change the filter, and flush fluid. When I say flush I will not use an exchange machine but instead, remove via the cooling line. My questions are, does this sound like a good first step? If yes what is the recommended fluid type using today's fluids on the market? I was considering Redline D4 but it's a little pricey. The car is not my daily driver. It's more of fishing, hunting, and camping vehicle.

Thanks all!

 

[zmann96]

What color is the fluid? the darker red the more worn and burnt. I would also change the filter after you do the change. Before putting in the pricey oil, I would use some maxlife first, if it clears up then do another change down the road. My 2003 yukon tranny went at 157K, I had it rebuilt.

 

[SupaDJ]

That's a great idea Zmann96, thanks. The fluid is actually lighter than I anticipated, almost too light. It doesn't smell burnt either. If you don't mind me asking, roughly how much did it cost you to rebuild your transmission?

 

[JonnyTahoe]

Hey forum, first-time poster. I recently bought a 2003 Yukon SLE with 162K miles. When I take off from a dead stop it takes off like it's in a low gear. It shifts to the proper gear within 30 seconds. The car runs fine on the freeway. If I start in 2nd gear it takes off normal. when I shift from 2nd to 3rd it jumps a little. Shifting from 3rd to Drive is smooth. I was going to swap the TCC sensor, change the filter, and flush fluid. When I say flush I will not use an exchange machine but instead, remove via the cooling line. My questions are, does this sound like a good first step? If yes what is the recommended fluid type using today's fluids on the market? I was considering Redline D4 but it's a little pricey. The car is not my daily driver. It's more of fishing, hunting, and camping vehicle.

Thanks all!

You mean your Truck.

 

[509Tahoe]

im having the same issue..ill be doing 25 mph and itll have me in 4th gear
makes it very sluggish when trying to get up to speed

 

[SupaDJ]

You mean your Truck.

Yes, I meant my truck.