Best 904 core?

1967DartGT said

I've got a fairly strong 318/349 stroker that I'd like to hook up to a 904 transmission so I can keep my driveshaft, linkage, etc. What year 904 should I look to rebuild to have decent strength, better gear ratios, etc? The machine shop figures I should make around 425 hp with 10.2 compression and prepped rhs heads. The voodoo cam recommends a 2800 stall converter.

Click to expand...

At that level a good rebuilt 904 is fine, if you want a 999 get a non lockup to start with, you're going to need the input shaft and pump from one anyways so it's cheaper to start with the right one first.

My buddys 340 Dart ran 10.8's for 3 years with a 4 clutch 904 and 7260 U joints, when he swapped in a 416 and ran a 9.90 the trans lasted 2 passes and the U joints lasted 4 passes.