1973 SD Transam 4 spd 1 of 72 built

[black69]

Originally Posted by njsteve

That is correct. From personal experience I think the autos run better with the 3.08 rather than the 3.42.

Here is some info out an attached link on the performance related to rear end ratios:

Where the SD-455 Trans Am dropped to low-14 second quarter-mile range was when it was equipped with both the automatic transmission and air-conditioning which gave it a mandatory 3.08 rear axle ratio.

Link of reference:

http://www.firebirdnest.com/index.ph.../9-1973transam

[black69]

Hey, I think a relative to this car just sold.
http://www.legendarymotorcar.com/inv...55sd-1178.aspx

[Gary Anderson]

"All the four speed transmissions were the same internally and were no longer built by Muncie in 73."

Can you elaborate on this? I thought Muncie's ran through mid year '74?

[njsteve]

Sorry about that, my typing overtook my memory recall ability. The close ratio Borg Warner Super T-10 started in 74 and was used in the 74 SD455 cars. The SD455 still had Muncies in 1973 but if I recall correctly, it was the M20 wide ratio. The regular 455 got the close ratio M21, (the M22 got dropped after 1972).

BTW, all the transmissions used the "M" in front of the number regardless of who made them (not just Muncie) and what year.

There's some SD455 trivia on the trans question half way down the page here: http://www.angelfire.com/mi/jamos1/sdtrivia.html

[olredalert]

Originally Posted by njsteve

Sorry about that, my typing overtook my memory recall ability. The close ratio Borg Warner Super T-10 started in 74 and was used in the 74 SD455 cars. The SD455 still had Muncies in 1973 but if I recall correctly, it was the M20 wide ratio. The regular 455 got the close ratio M21, (the M22 got dropped after 1972).

BTW, all the transmissions used the "M" in front of the number regardless of who made them (not just Muncie) and what year.

There's some SD455 trivia on the trans question half way down the page here: http://www.angelfire.com/mi/jamos1/sdtrivia.html

----I'm sure that the wide ratio M-trans helped that 3.42 geared SD get those kind of quarter mile times......Bill S

[auwrestling]

Originally Posted by olredalert

----I'm sure that the wide ratio M-trans helped that 3.42 geared SD get those kind of quarter mile times......Bill S

Yes much better off with wide ratio , I've had both .

[Stefano]

Looks like Tommy Lembeck's car. It was for sale at MCACN VIP.

[The Boss]

Damn!

[flyingn]

holy crap is that nice!!!!