the trans i'm going with is an auto valve body (wish it was manual) but i want to go ahead and do this now. how does a vaccum modulator know when to shift? say i'm shifting at 6600 right now with my 4l60e pt4200 setup, how does a vaccum mod. transmission know when to shift? i'm sure there's an easy answer but i don't know. also...how hard will it be later to go and put in a manual valvebody and transbrake? will i have to pull the trans outta the car or not? and will the same shifter (b&m pro shifter) work with a manual body as the auto? thanks a ton for any info.

 

You are more than likely going to run into a lot problems trying to program the auto shifter to shift correctly.

Why not go with the manual. No programming needed. Just do it right the 1st time. Manual, reverse shift, w/transbrake.. get the cheetah shifter. No ratching.. takes only 2 fingers to shift. No way to mess it up.

David

 

It's really worth going with the manual valve body. Everytime I hit my transbrake, they have to pry the smile off of my face. Cheetah shifter rocks as well.

 

who makes different valve bodies for the 400? the trans is already build and waiting, but i might have to go ahead and make it manual from what i see you guys saying. let me know if you can, thanks guys.

 

Yes you can, just need to buy the valve body assembly. I have a Hipster and they are supposed to be the fastes brake around. Love it, would never be without it.