Took my M1165 for its first drive today, didn’t go well. I couldn’t get it past about 10 mph, if I gave it more gas it would feel like it was slipping, didn’t feel like it actually accelerated. Transmission didn’t try to shift or anything. Any ideas what could be going on and what I should check?
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M1165 Won’t Accelerate, Feels Like It’s Slipping
- Thread starter 65grendel
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- Camp Wood/LC, TX
Did you try high lock on the transfer case? Sometimes these have CV axle problems that resemble slipping.
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Any inspections prior to driving? Fluid levels checked? Visual inspections via a creeper underneath?
yes, all good, no leaks or anything either.
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- Location
- Camp Wood/LC, TX
yes
Thunderbirds
Well-known member
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- Northern Black Hills South Dakota
I would search for and download a copy of the 4L80E Transmission Troubleshooting Guide dated Jan 2008, the short the Terminal A and E under the left rear seat Data Link Connector to see if you have any transmission error codes. Then work through the troubleshooting guide from there.
Good luck. This can be a PITA, but usually is something like a misaligned switch, out of tolerance sensor or similar.
Good luck. This can be a PITA, but usually is something like a misaligned switch, out of tolerance sensor or similar.
Thanks. I'm going to check power first because someone told me that the TCU light should come on when the truck is in run but not on and turn off once running, I don't think the light was coming on at any point but I didn't really check before starting. If that is working I'll try a short trip in HL and also try shifting manually between gears (I never tried that either, I was just focusing on making it back home), if still no luck then I'll see what I can for codes.