TH400 shift points

[elyon]

Hey folks,

Just ordered a weight and spring kit for my transmission. Currently shifts at 3000 RPM. Want to get it up to 5000-5500.

Anybody have experience doing this? Is it just hunt and peck or is there some science to it?

 

[folkenheath]

I just used finish nails as pivot pins and ground the weights with a grinder a little at time until it shifted where I wanted it too. Be sure to try it in both high and low for the t-case. I thought I had it all set with it in high range, then when I put it in low it hit the rev limiter before it shifted, so I had to start over and take a little less off. Everything happens quicker in low range and it didn't shift quick enough then.

http://coloradok5.com/forums/showpost.php?p=2887071&postcount=117

Do you have the kickdown switch hooked up?

 

[Greg Ducato]

If it shifts at 3000 rpm it is either a diesel governor or you don't have a functioning kickdown system. If the kickdown system is disabled I suggest getting it back in operation first so you can get the rpm up where it belongs before the governor mods.

 

[elyon]

The kick down works at lower speeds.

 

[Greg Ducato]

With the key on and someone in the vehicle, depress the throttle and check voltage at the case connector on the drivers side of the trans.

 

[elyon]

I checked it arlier and it had 12 volts. The switch at the pedal is brand new.

 

[elyon]

If I remember correctly it was still shifting at 3000 even after kick down.