4T60 issue - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-12-2006, 06:06 PM   #1
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Default 4T60 issue

Howdy guys. One of my buddies is dealing with a 1990 3800 stock drivetrain, so throw in a 4T60 (not an E). His fluid level is good and he replaced the shift modulator to try to cure this problem, but did really improve it. Here'* his issue according to him...

it doesnt shift into second, it stays in 1st, and once you get it goin up to 15-20 it acts as if in nuetral and pressing the gas does nothing but keep the rpm'* up, doesnt speed the car up. eventually after the car warms ta to lines it will start acting normal, or if I bassicly floor it to like 30-35 it then will shift and act normal

Any help'* appreciated. Thanks guys
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Old 12-12-2006, 06:41 PM   #2
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2nd gear clutches are worn. That'* typically the first thing to go on a high-mileage 60. A full trans flush may help for awhile.
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