Having problems with your 1993 GMC Sierra ?
I have a 3500 with a 6.5 turbo diesel, I am having transmission trouble and the shop cannot find any codes to fix the problem. the tranny was rebuilt 6000 miles ago, and it just started giving me trouble. After pulling a trailer about 70 miles or so, it downshifts into second gear, and will not shift above that. After a rest, it will shift again, and then after a few miles, it will go back to second.
It only does this with a trailer hooked to it? Do you know what transmission it has in it?
Repair Help & Product Troubleshooting for 1993 GMC Sierra
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