4L80E help
9suburban3
11-15-2003, 01:06 PM
93 Sub. with 454 and 4L80E. 3rd trans, same problems. Looses o/d, slam shifts 1-2. Any info on this concern would be appreciated. Thank you.
97burb
11-26-2003, 06:31 PM
Don't know about loosing OD but the slam when shifting from 1st to 2nd happened in my '97. Seems Chevy went to a pwm system on a solenoid in the tranny that wears out easy. You probably had a delay, then the slam, before shifting. Chevy dealers want around 800 bucks to fix it; I got it done at a tranny shop for less than 200. There is a program on it so you just have to mention it; they will know what it is.
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