Inspection of a 904 torqueflite

glhx said
View attachment 1715362468
This was done by hot rod magazine.....he’s upgrading to the 5 drum clutch and went with longer forward clutch splines-

You can see in the picture that one is slightly longer than the other.

However......my 904 and 999 have the same height on these
1.30 on both
View attachment 1715362469
1.30 on both of these -

So why are they the same. The 904 has 4 clutch drums
The 999 has 5/4

The direct drum should slide into this piece. Either I have both long ones or both short ones. Since this was gone through. Maybe they replaced it with the wrong one or could it have come like that from the factory. Maybe it doesn’t matter. I don’t know.

I guess this is where the learning process comes in

What should he measurements of these splines be?

I beleive the length of the short spline is 1 inch and the long is 1 1/8. Remember you can not interchange the forward clutch drums.
If you measure the snout part that goes into the stator they will measure .060 different with the lockup one measuring bigger.
A&A trans sells solid wider bands for the direct drums. They also sell selective snap rings for the gear train and the clutch packs.