Originally Posted by
niznai
I am not sure about that. The gear housing half looks different on the outside.
I'm referring to the 39t spool pulley that is available for the TA06. The diff is all new for sure. The 503/06 one takes the same gears as the previous diff and has the same oil volume.
Originally Posted by
niznai
And it's not going to make life easy for stock classes, with the new internal ratio. Hopefully will move to a higher tooth count for the center pulleys (don't hold your breath).
This new diff is different internal ratio (inside the diff) but this won't effect the FDR - the larger pulley on the diff/spool will though. It's just the relative size of the small/large bevel gears inside. This will effect the diff action, not the drive. They might just be the gears from the Evo6? The old diff is 20:12 the Evo6 is 18:10.
If the diff/spool pulleys are 39t and they keep the 20t centres, it will be 1.95 - pretty much back to what the 417 was with 37:19 (1.947)