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Drivetrain => Transmissions => Topic started by: bbbbuick on October 01, 2015, 02:22:27 PM
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Hi all,
I'm trying to troubleshoot an upshift flare I am having during slow acceleration. It occurs only after trans warms up, then is fairly consistent. Under more throttle the shift is as normal. I also notice the flare when shift occurs in a corner. Manual shifting of the trans from L to D works as normal. Per advice from local hydramatic shop (only quality place around that does 60's era GM trans work) I tried a slight overfill of the fluid to check for short pickup pipe, as from what I can tell all replacement filters have incorrect length pipe and need to be trimmed. It didn't fix the issue. Perhaps related, or the cause, I also have no kickdown. It would seem the switch is bad, but I am not sure I tested it correctly.
Hoping to get ideas of where to start. What's the proper method to check trans downshift switch, and can that affect the upshift at all. Is there a switchpitch control that might be working incorrectly, causing a different stall point at the shift or would that feel different than a flare? If my downshift switch is bad, any ideas on where to source one?
Sorry for so many questions but as much as I read my chassis manual I can't find a section that clearly addresses this. Last details, 300ST trans was rebuilt 40K ago and other than the flare works as expected. Any help appreciated guys. Thanks.
Elvin
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Bump. Kickdown switch testing method? Anything? All suggestions appreciated, thanks.