How long will a 904 last behind a 340?

My 904 has about 40 passes on it 5500 street miles and it is doing fine. I did have it opened up and checked about 500 miled ago and it looked great inside.

We used a 999 behind a warmed up 360. It worked very well. In fact, for most small blocks, I prefer building a 904 style tranny.

How about 10 years of racing an 11 second car. Just check the second gear band adjustment after a few miles,then just drive it.

It has about 80k on it. Ran good with the 318. Hope it will last.

Years ago I swapped in a 340 into a 318 challenger and drove it for like 4 years until the car got so rusty is was not safe anymore. Then I parted the car back around 1985.

I also ran nitrous on that 340 too and the 904 did great and would bark the tires during shifts. Still have the trans with a shift kit in it, it never gave up.

The 904 behind my warm 360 in the '68 does fine. It was in a street class drag car before I put it in the Dart and that was 11 years ago. Has a van first gear. I wouldn't worry about it lasting, as long as it has no issues now.