904 vs 999

318willrun said

I'm no transmission expert.... with that said, this is what I "think" I know....

• the A999 is like a 904 but has a lockup TC, usually a lower 1st gear ratio, more clutches and stronger bands.
• However, the 904 usually has a "higher stall" in the converter from the factory.

I have found that even though the 999 has a lower 1st gear ratio, the 904 "feels" quicker because it seems to flash the converter a few more hundred RPM's taking off.
Am I correct?
Thanks in advance for knowledgeable responses.

Click to expand...

From the factory, the bands for these transmissions are:
1961-1993 Kickdown band 1.4" Wide
1992-2003 Kickdown band 1.6" Wide This band is also used on all the A500 series of transmissions

1960-2003 Low and Reverse Band Single wrap, used with 6 cylinder and 273 engines
1968-2003 Low and Reverse Band Double wrap, used on V8 except 273 engines. This band also used on the A500 series of transmissions

Other bands might be available in the aftermarket, but from the information I have on factory bands, there are no other options that I can see.