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Old 12-04-2018, 06:10 PM   #2
Registered User
Join Date: Apr 2008
Location: Gillette, WY
Posts: 16
Re: 1991 K5 Transmission Overheating

Sounds like you are having fun...

Just traveled through SD to hunt near Watertown. Took my 90 K5. 350tbi, 700r4, 3.73 gears, 31x10.50s.

I have the same behavior on the interstate, although I don't have a temp gauge for the transmission so I am probably cooking it.

I think the thing just doesn't have enough power to pull those speeds and overcome wind resistance with the trans locked and in overdrive. Lower gears would help, but I think more power is the real answer.

At 65 it does great. Even at 70-75 if I have a tail wind. Coming back west, I just drop it into 3rd gear so I don't have to fight the trans shifting.
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