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This guy on one of the Facebook pages was having hard shifting and it fixed his issue. Not sure if the same will be said for slipping but I still think it’s worth a try.

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This guy on one of the Facebook pages was having hard shifting and it fixed his issue. Not sure if the same will be said for slipping but I still think it’s worth a try.

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I found in the owners manual where it said 47,000 miles change fluid and filter. I guess my fault for not seeing that. But you would think the gm dealers would of tryed pushing me to change that. But I’ll get it done. Trucks being towed to the dealership tomorrow to figure out the reduced engine light and the exhaust temperature sensor code. I’ll have them change it. Thank you sir
 

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I had a similar issue around 43k mi where the shifting felt very "loose" and sloppy. There's a few known issues and TSBs out for transmission shift issues (the infamous "shudder"), some of which apply to the 8spd gas only, others to both the 6 and 8 spd transmissions. Most all of them trace the issue back to transmission fluid break down and the fix is to do a flush and refill with a newer spec transmission fluid. None of the TSBs quite fit my issue but a few of them were close enough that the dealer just ended up just picking one to do the work under and did the flush / refill with the new fluid. Right away it felt better but it took about a week for the transmission to "re-learn" my driving patterns. After that it was great; shifted like new.
 

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I didn’t buy this truck new but I am wondering if anyone notices the RPM going a little higher between gears as it shifts? It almost seems like it slips a bit or something, I’m not sure if it’s the clutch in torque converter allowing some slip or not.

I’m guessing I’m hoping to hear that it’s ok and that it’s normal without a trans tune
I bought 2016 used with 38000 miles. I have noticed that mine slips shifting from 2nd to 3rd under very light load. If I accelerate under heavy load it doesn't slip at all. While in manual mode there is no slippage at all. I also have had the torque converter replaced 4 months ago at 75000 miles under warranty. This repair fixed shuttering problem but didn't change slippage at all. I agree with one of the other posts that it may be a programming issue.
 

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I had a similar issue around 43k mi where the shifting felt very "loose" and sloppy. There's a few known issues and TSBs out for transmission shift issues (the infamous "shudder"), some of which apply to the 8spd gas only, others to both the 6 and 8 spd transmissions. Most all of them trace the issue back to transmission fluid break down and the fix is to do a flush and refill with a newer spec transmission fluid. None of the TSBs quite fit my issue but a few of them were close enough that the dealer just ended up just picking one to do the work under and did the flush / refill with the new fluid. Right away it felt better but it took about a week for the transmission to "re-learn" my driving patterns. After that it was great; shifted like new.

The degraded fluid rings true. I think my factory fluid was half and half, but GM now uses full syn trans fluid. When I decided what to use for my change (36K, half with heavy towing), I was tempted to use the local trans shop, but went GM after hearing that they upgraded their fluid. No problems before or after....
 

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I bought 2016 used with 38000 miles. I have noticed that mine slips shifting from 2nd to 3rd under very light load. If I accelerate under heavy load it doesn't slip at all. While in manual mode there is no slippage at all. I also have had the torque converter replaced 4 months ago at 75000 miles under warranty. This repair fixed shuttering problem but didn't change slippage at all. I agree with one of the other posts that it may be a programming issue.
Mine does also
its a fkup in The transmission programming. It has nothing to do with the hardware. That’s why it doesn’t do it under a load. They are trying to make a smooth shift but take to long to put pressure on the clutch pack.
Aftermarket transmission programming will fix it.
Blame GM for to much computer control and sloppy transmission coding.

I noticed sales of the Colorado/Canyon falling off.
GM you need to do a lot better.
The word is out about bending frames and crappy transmissions.
Over priced Diesel engines...
You can’t hide from the internet....

Rob
 
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