A-999 Swap and Information

Sedanman said
The clutch plate splines looked fine. We couldn't figure out the grooves in it either. All the clutches were fried & the steels burnt & someone had sanded/ground the burnt spots. They seemed to use it as 904 w/o locking out the OD behind a 340 in a 70 Challenger. My buddy is installing the good clutches,bands & also a Trans Go shift kit if they make 1 for it. It is going behind a 0.40 340 with balanced bottom end & wondering what converter I should use.

As I look at the grooves again they look so uniform like they were machined they must be for something to clear, I'd assume anyway. Actually it's not an OD trans. Just has a lockup converter. It'll lock and unlock via hydraulic pressure provided by the valve body and the switch that you mentioned is cut close has a wire leading to the brake switch to make it unlock anytime you step on the brake. Converters aren't nearly as plentiful for a lockup trans. but they are available. As for what converter you need that mostly depends on the cam. Big cam needs a high stall. Stock cam works fine with a stock stall. There are 2 ways you can go about it. If you want to keep the lockup feature you'll need to call around some good converter companies and see what they have or can make for your application. Your other route is to swap the input shaft and valve body for a non-lockup converter. That'll open up lots more options for converters. Plus it'll guarantee you can use a trans-go kit. If that's the route you choose you can get the parts to do it dirt cheap at www.wittrans.com Just look for an input shaft for a 68 or newer 904 and a valve body for any non lock-up 904 will work but the 72 and up model has part throttle kickdown which I like, but that's your choice.