Stock Auto Trans Rule Change History ?

[Gmirza]

Originally Posted by MR DERBY CITY

Sorry George, but you are WAY off …..

I know it was around this time they allowed a 904 in place of a 727 behind a 340. Any corporate transmission that could bolt directly to the engine was allowed.

[MR DERBY CITY]

Originally Posted by Gmirza

I know it was around this time they allowed a 904 in place of a 727 behind a 340. Any corporate transmission that could bolt directly to the engine was allowed.

George, I know NOTHING about Mopars but,….you are replacing one 3 speed trans with another 3 speed trans. The OP would like to know when the GM guys could replace their 2 speed trans with a 3 speed trans. And it was WAYYYYYY after 1990….

[Jack McCarthy]

ok i know the answers ....
i got the turboglide approved as a 3 speed for 58-61 chevys in 2010 i believe was a struggle as i also had to weigh one show it was close to cast iron PG it was 9# lighter full of fluid ... then within a year nhra opened the flood gates and allowed any GM trans.

turbo 2.75 was about .10 better after 3 converters
291 metric is .10 better than that good 350

i weigh 4500 lbs FYI

captain