Losing Overdrive - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Go Back   GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat > Pontiac Bonneville > 1992-1999

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.

LinkBack Thread Tools Search this Thread
Old 07-27-2009, 12:38 AM   #1
Junior Member
Join Date: Jul 2009
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
1981X11 is on a distinguished road
Default Losing Overdrive

Hello all! I have a '95 Supercharged with the 4T60E, and have a frustrating issue. The car shifts smooth and there is no slipping, but after driving 10-20 minutes it shifts from overdrive to 3rd. When you show down it drops back to the lower gears fine, shifts fine, but will never go beyond 3rd gear. Let it sit a few hours and it'* fine again with all gears for the first 10-20mins, then OD is gone again and back to 3rd.

I changed the fluid and filter, and that did not fix the issue. I've read there are three selenoids behind the side cover that control the shifts, but before I tear into this thing does anyone have suggestions? I know if I take it to a transmission shop they'll just say I need a new transmission, and this does not "feel" like that. There is no slipping and for up to 20 miles it'* perfect.

Any ideas are GREATLY appreciated, thanks!


*** Moved from Performance ~ Kevin ***
1981X11 is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Went to store-had overdrive, coming back-NO OVERDRIVE Hafrod Buick 13 06-01-2006 09:44 PM
overdrive or not to overdrive duffer26 1992-1999 10 03-12-2004 11:09 PM
Losing coolant like a ..! MikeDiaz 1987-1991 8 01-14-2004 05:11 PM
I Must Be Losing my Mind Jim W Lounge 13 08-20-2003 02:23 PM
Losing boost with an air intake 00arcticssei Performance, Brainstorming & Tuning 5 06-16-2003 11:46 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 04:29 AM.