Stock Auto Trans Rule Change History ?

[oldskool]

" I don't remember the exact year but it was in the last decade..."

So, for a popular sbc combo that previously had to run a PG, aprox how much quicker could they run, with a good 3-speed ? Hey, I'm just assuming they ran quicker.

I know that lots of bracket racers run a Glide, for consistency & less traction problems. Just assume that most former PG Stock racers choose to now run a 3-speed. Is this correct ?

[Mark Yacavone]

Originally Posted by oldskool

" I don't remember the exact year but it was in the last decade..."

So, for a popular sbc combo that previously had to run a PG, aprox how much quicker could they run, with a good 3-speed ? Hey, I'm just assuming they ran quicker.

I know that lots of bracket racers run a Glide, for consistency & less traction problems. Just assume that most former PG Stock racers choose to now run a 3-speed. Is this correct ?

How much quicker? Usually some, if you can hook it.

Most PG's are now 200's except for maybe 67 oval port Corvette.

[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