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Is there a difference between the keyway on a 904 vs 999 torque converter? Reason I ask is because the purple torque converter that I’ve had laying around for years, thinking it was for a 904, will not fit in what I’m pretty sure is a 1985 999. Look at the difference in the slot sizes of the two...

The front seal in my transmission appears to be leaking. How hard is it to replace? Which way would be easier; removing the engine to replace it, or removing the transmission, or pull them together and separate them once I get them out? I'm getting tired of removing and installing engines on...

Can the center sections be swapped with another center section type? I have a 741 with 3.23 gears, not sure grip. I want to swap for a 742 or 489 for the larger pinion stem so I can eventually go with more power (have my eye on a good 360 for sale locally). The rear end is not yet installed in...