Stock Auto Trans Rule Change History ?

[oldskool]

Hey guys, in NHRA, what was the 1st year a combo that came with ONLY a 2-speed auto trans, could use a 3-speed auto trans ?

Common example would be the PG Chevy combos that could then use a TH350, because of the new trans rule.

For those of you who had some 1st hand experience with a Chevy PG equipped Stocker combo, that switched over to a TH350, what was the aprox ET change ?

Aprox how much quicker is a common Chevy Stocker combo with a 200 trans, than with a 350 trans ? I'm talkin about both trans having the very latest & quickest upgrades. Another way to ask it may be: How much quicker is the best currently available 200 trans vs the best currently available 350 trans in, let's say, a popular sbc Stocker combo ?

Thanks to those who have the time & will relate their experience in this area !

[Angelo DiTocco]

Another way to ask it may be: How much quicker is the best currently available 200 trans vs the best currently available 350 trans in, let's say, a popular sbc Stocker combo ?

Thanks to those who have the time & will relate their experience in this area ![/QUOTE]

Hi
The short answer is - pretty darn close..... the difference ends up coming down to the combination of first and second gear ratios that work best for you.... the (high end) 350's have a few more of these combos available than the 200 does... The other factor is, of course, how much experimenting you are willing or able to do.

[Mark Yacavone]

Originally Posted by Angelo DiTocco

Another way to ask it may be: How much quicker is the best currently available 200 trans vs the best currently available 350 trans in, let's say, a popular sbc Stocker combo ?

Thanks to those who have the time & will relate their experience in this area !

Hi
The short answer is - pretty darn close..... the difference ends up coming down to the combination of first and second gear ratios that work best for you.... the (high end) 350's have a few more of these combos available than the 200 does... The other factor is, of course, how much experimenting you are willing or able to do.

I don't remember the exact year but it was in the last decade.
S/S was first, then Stock, then 4 speed stick shifts. (oh yeah, then clutchless in S/S)
The 3 speed deal wasn't put in to benefit the little guy with a 67 Camaro..Trust me.

I would say that if you took a 350 and put in a 2.75 low , an aluminum direct drum, and were really good with a lathe, you could come pretty close to an entry level 200 like I build.
The Pro Trans and the Coan are in a different league. As Ange said, lots of different ratios available too.

[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 …..

[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