posted this in drivetrain, but thought it might get some help here also

I've been having trouble out of my "bullet proof" transmission for awhile now. It has a suncoast billett triple disc convertor, suncoast valve body, extreme duty clutches, a billett flex plate, and a deep pan.

since day 1 of the rebuild it has had the following problems:
seems to jump between 1st and 2nd gear at about 15mph.
slips in 3rd gear during light throttle
shifts through all gears fine during wot, but seems to slip under light throttle

I have been back to the shop that built it 5 times since it was built 4 months ago, complaining about these things each time. Every time I was there the guy kept telling me something was wrong in the valve body and he kept playing with different springs.

I called him monday the 8th about bringing it back in, and once again he thought it was the valve body and told me to wait until thursday for him to get the parts in. well I was driving down the road wednesday with my bd set on stock trying to baby it until I could get it in the shop, and it went crazy in 3rd gear. It would shift 1-2nd fine then once it hit 3rd it would just slip, when I could get it through 3rd it was fine in 4th. So I called and the owner of the shop said he was going out of town and I wouldnt be able to bring it in until monday. So I kept being easy on it, and it seemed alot better, it still had the original problems, but 3rd gear was nothing like it did wednesday.

I dropped the truck off sunday night at the trans. shop and the owner called me monday saying that it was burnt up again.

is there any common problem that would cause these issues, or do you all think there may be something he is messing up on? or possibly a crack in the case?

I want to help him come up with ideas, because when I get it back I'd like for it to be right this time

 

ok your 1-2 shift jumping back and forth is more than likely a bad governor pressure solenoid. you can pick one up for around $80. change it, its cheap insurance. As for burning up your trans make sure your trans guy resets your gear select cable EVERYTIME after messing with the valvebody especially if suncoast uses an aftermarket manual valve they are very finicky. As for the slipping into third gear maybe have him double check the 2nd gear apply band. its also possible the front clutch pack is set up loose. PM me if you need anything else.

 

Agree with this for the 1-2....i replaced mine just in case.....also the DTT Shift Enhanser will eliminate the 1-2 hunt at light throttle as well as third gear flare (dont think this is what u have??).....