1991 Sierra No Overdrive

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rrocheleau

02-22-2008, 10:19 PM

I have a 1991 with a 305 and auto trans that does not go into Overdrive. Wondering if anyone might have an idea.

Thanks

2000CAYukon

02-23-2008, 02:13 AM

Could be bad seal/worn servo bore at the 4th apply piston. Or could be a worn valve body bore causing a weak signal to the 4th apply piston (see http://www.sonnax.com/announcements/77964-01K.pdf).

//2000CAYukon

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