Stock Auto Trans Rule Change History ?

[Gmirza]

The rule change was around 1990. Give or take a year.

[MR DERBY CITY]

Originally Posted by Gmirza

The rule change was around 1990. Give or take a year.

Sorry George, but you are WAY off …..

[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

[oldskool]

Originally Posted by Gmirza

The rule change was around 1990. Give or take a year.

Just curious, were most PG users quick to change over ?

Or, were there a lot who wanted to stay with their PG ?

Were there some of the heavy hitters that did a lot of testing, before switching over ?

It just seems like this was one of those major Stock rule changes, & since I was not involved, I wonder how big of a deal it really was, for the PG racers, back when it happened.

[Mark Yacavone]

Originally Posted by oldskool

Just curious, were most PG users quick to change over ?

Or, were there a lot who wanted to stay with their PG ?

Were there some of the heavy hitters that did a lot of testing, before switching over ?

It just seems like this was one of those major Stock rule changes, & since I was not involved, I wonder how big of a deal it really was, for the PG racers, back when it happened.

You can bet your azz the guys with 67-8 327 /275 Camaros were quick to change over.
The three speed 350 LT 1 cars started at 275 also...They are now 340 something...
The 327s are at 270!

[Stan Weiss]

Originally Posted by Mark Yacavone

You can bet your azz the guys with 67-8 327 /275 Camaros were quick to change over.
The three speed 350 LT 1 cars started at 275 also...They are now 340 something...
The 327s are at 270!

Mark,
Who makes these ratios?



Stan

[Mark Yacavone]

Originally Posted by Stan Weiss

Mark,
Who makes these ratios?



Stan

Not sure who makes them but Coan and Pro Trans offer several.
To be fair, McClay 200's have some ratio options but he's at the higher end of that style.
He won't sell parts to the public. You have to have one of his transmissions.
Leo G at Remac will sell you a 2.91 planetary for the 200.

[Stan Weiss]

Mark,
Thanks for that information. I knew that McClay offered a 200 with a 2.91 and Rossler offers a 400 with 2.97 and Coan a 400 with 2.96. I had not heard of anything lower.


Stan