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Trans Hesitation?

utilityart

By utilityart
in Ask A GM Technician

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utilityart Enthusiast

utilityart

Posted
Posted

My truck seems like it hesitates to engage the transmission when I go from braking or coasting back to throttle. Not a long time but enough to build RPM and get a lurch from it. When I bought it I ran carfax and it said it had been in to get the transmission flashed. I've got like 56K on it.

 

Also does the 2007 NNBS 6.0L have a trans cooler on it? I was towing our new-to-us travel trailer (around 4k#) and I had it set to watch trans temp and it got up to 210 a few times pulling up large hills. I wasn't towing fast or even the speed limit most of the time. I really don't like to see it that hot though. On a lighter side I flipped it to see instant MPG and it said 3, ouch. I got 8.5 on that tank. :(

 

The guy I bought it from must have been telling the truth when he said it was highway miles. The avg mpg said like 15.5 and within a few weeks of me driving to work and back it said 13.5, it stayed there ever since until my camping trip and now sits at 12.9. I know that isn't really accurate but its a good indicator.

jro909 Senior Enthusiast

jro909

Posted
Posted

um my trans hesitates too, i think it has to do with drive by wire and the nannys...if your worried take it in...the 6.0 should have the aux trans cooler, my 5.3 does :sigh: umm as far as trans temps read your owners manuel i think 210 sounds fine

 

also go get a tune and you may get better mileage

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