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Old 06-10-2024, 02:59 PM
Commissar Commissar is offline
Junior Member
Join Date: Jun 2024
Posts: 21
Default Shifting Question - TH400

Hey everyone, I have a recently new to me 68 GTO that I bought and have been tinkering with now trying to get it right. The Engine is a 400 bored 0.030" over and sounds to be running strong attached to a TH400 his/hers hurst shifter.

My problem is when I am at WOT the shifts are very slow, like the car takes a few seconds to figure out what gear to go into (RPM according to hood tach is around 4-4500 when it starts thinking about shifting). Normal driving it shifts fine. Where do I start trying to troubleshoot this? When it does shift it shifts hard. I believe there is an 1800 stall in there. What is some other information that you all need to help me figure this out.

I have some other issues that I need to address as far as timing and carb setup, but those will be a different thread.


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