Quote Originally Posted by 1JohnnyO
I think I know what I have....and my friend's car also. They are TH400's without a doubt.
a th400 trans. will not down shift after 40 mph, with out the passing gear sw. hooked up. with it hooked up it will down shift up to round 60 to 65 mph. it drops back to second above 40 and it goes to low below 40. if the sw. is not hooked up it want do that. all that you see on the trans is a wire plug. the sw. is on the carb. or hooked to the accelerator under the dash.