4T60 E Transmission slipping away - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-09-2007, 05:39 AM   #1
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Default 4T60 E Transmission slipping away

I need help. A couple a winters ago it got very cold here and My transmission wouldnt engage first thing 4am. It happened only once and then again once this last summer 1 mile down the road at a stoplight. I finally got around to a fluid and filter change the middle of last week. 50 miles after that now and until tonight it would not engage without a lot of fenagaling. Like shifting through the gears slowly. I was getting a quad driver 4 code 670 error. I added a half bottle of lucas. I also found that pulling the vacuum hose off the transmission modulator let the car shift normaly but with a harsh hard clunk. I read here that changing trans fluid after way too late on an old trans clears the system of grit needed to provide better connections. Thats its or the pump like Will suggested. So a $1350 new trans or $13.50 modulator? a new modded trans would be choice
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Old 12-09-2007, 11:01 AM   #2
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Please don't double post. Continue using your current transmission topic.
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