Found out that my transmission is a TH400 and it does not have the kickdown switch hooked up. I have been told by a friend that this must be connected otherwise it can damage the transmission. I have searched on here but not finding anything on that-here is the info he gave me:

"The detent (kickdown) system also modifies accumulator pressure to increase oil pressure to the clutches for increased durability, so it is vital that it be functional in all cases.* This means that if a TH-400 is run without a correctly operating detent system (kickdown), the clutches will suffer accelerated wear because the oil pressure is less at full throttle shifts."


Does this sound correct? I had never heard it before...but I that's the case I think there are alot of us that will be hooking it up !! *

Not true.
You don't want detent kickdowns on a blown application anyway.

Yeah, I concur. I run a TH400 with a transgo full manual shift kit...NO DETENT hooked up. I do still run a modulator though.


"The detent (kickdown) system also modifies accumulator pressure to increase oil pressure to the clutches for increased durability, so it is vital that it be functional in all cases.* This means that if a TH-400 is run without a correctly operating detent system (kickdown), the clutches will suffer accelerated wear because the oil pressure is less at full throttle shifts."

Yeah, on a bone stock transmission. But usually shift kits modify the clutch hydraulic circuit to compensate for this by increasing line pressure.

My Th 400 has not had one on it since I had it built in 1987. Still going strong as of yesterday.