[Tellyshavilli]

Originally Posted by jhein

This thread has got me wondering about my car. There is no axle option on the PHS but it does have the HD radiator and no A/C. So does that mean it had a 3.73? When I got the car it had been changed so I don't know what came in it.

I also had a ra 3 1970 Trans Am that had the original M21 transmission with a 355 rear and the only thing on the PHS was heavy duty radiator and change alert

[unruhjonny]

Originally Posted by Tellyshavilli

I also had a ra 3 1970 Trans Am that had the original M21 transmission with a 355 rear and the only thing on the PHS was heavy duty radiator and change alert

interesting, I was unaware of a close ratio transmission ever being paired with 3.55's!?

[jhein]

Originally Posted by Tellyshavilli

I also had a ra 3 1970 Trans Am that had the original M21 transmission with a 355 rear and the only thing on the PHS was heavy duty radiator and change alert

There is a "change alert" on my PHS. If not for this thread I would have thought it maybe had a 3.55 from factory.

PS: sorry for the thread hijack but hopefully it's all related

[R 70 Judge]

Thanks to the board members that reached out regarding parts. If you have anything on my list that you’re willing to part with please let me know.

I have a 1970 only rear view mirror on its way

[R 70 Judge]

Originally Posted by jhein

There is a "change alert" on my PHS. If not for this thread I would have thought it maybe had a 3.55 from factory.

PS: sorry for the thread hijack but hopefully it's all related

I’m no expert but I’d guess your car was originally a M20 4 speed with a 3.55 rear gear. I don’t see “Axle-Perform” on your PHS

[R 70 Judge]

Originally Posted by Tellyshavilli

I also had a ra 3 1970 Trans Am that had the original M21 transmission with a 355 rear and the only thing on the PHS was heavy duty radiator and change alert

Oh very interesting. I missed this post earlier.

A close-ratio with a 3.55 gear is probably still a great driver. Any less gear can be rough. My brother has a 3.23 rear gear with a M22 in his ‘72 TA and I swear you can go damn near 60mph in 1st gear

[keith k]

Originally Posted by Tellyshavilli

I also had a ra 3 1970 Trans Am that had the original M21 transmission with a 355 rear and the only thing on the PHS was heavy duty radiator and change alert

Matt,
I don't doubt your car was equipped with those bits, but I suspect it was simply a misbuild, unless you had a build sheet showing it was intended to be built that way.

If M21/3.55 were an available combo, it would be common, since the 3.55 was the standard ratio with a Ram Air III. But yours is the only M21/3.55 car I've ever heard of. And Pontiac's technical tables don't show M21 as being available with anything other then 3.73.

[Green Hornet]

Originally Posted by trishieldchief

Car was ordered with Performance axle 3.73 posi rear axle, so it would automatically receive M21 close ratio Muncie 4 speed trans.

I believe the 3:73 performance rear axle was not specific to M21 in that year.

My friends 70 TA auto has that option on the invoice...IIRC

[Green Hornet]

You might also want to scope out the hole in the floor for the shifter......and see if resembles the the factory size/style....

Being a drag car...PO may have added the 3rd pedal for a while....and gone back to an auto...

Just another possible clue...

[Tellyshavilli]

Originally Posted by keith k

Matt,
I don't doubt your car was equipped with those bits, but I suspect it was simply a misbuild, unless you had a build sheet showing it was intended to be built that way.

If M21/3.55 were an available combo, it would be common, since the 3.55 was the standard ratio with a Ram Air III. But yours is the only M21/3.55 car I've ever heard of. And Pontiac's technical tables don't show M21 as being available with anything other then 3.73.

I’ll dig up the PHS and send a copy to you. The car had the original transmission in it with the VIN and 12 bolt 355 with change alert on Phs .

[padgett]

Not always. The RA (no such thing as a III) in my 4-speed 70 Judge came with a 3.23 because it also had A/C.

ps "12 bolt" interesting do you have a 455 ? Thought only GP 4-speeds got a 12 bolt (can learn if rong).

[unruhjonny]

Originally Posted by padgett

Not always. The RA (no such thing as a III) in my 4-speed 70 Judge came with a 3.23 because it also had A/C.

ps "12 bolt" interesting do you have a 455 ? Thought only GP 4-speeds got a 12 bolt (can learn if rong).

all 1970 Firebird Formula's and Trans Am's had them.
1970 Firebird Esprit models with the optional 400 (2bb) also got them.

[FASTASSBIRD]

Originally Posted by R 70 Judge

Thanks! Yeah I’d like to get the correct one and the chrome bezels. I love how they look. It’s one of my favorite features of 1970 TA’s. Mine says “radial tuned suspension” which I think is a 1977 piece but I’m not 100% sure. I also have the thinner steering wheel that feels like a ‘77 era wheel.

If anyone want to help me out with finding some of the parts I’m looking for I’d really appreciate it! I know you guys have sheds just full of stuff



Yes. Great guy. I believe it was initially built by Scott Rex back in the 90’s and street raced a lot before Mo bought it.

The correct bezel is gonna be almost impossible to find. You’ll probably have to find the later bezel. The bird moves from one side to the other in non A/C cars around mid April I believe. Matt can probably pinpoint it closer. Some day Randy Combs will finish repairing this one

[Transamric]

Great thread! But I'm feeling the need to warn guys about posting their PHS copies showing the key codes. If your car still has the original lock cylinders, no big deal for a crook to make himself a set of keys. Yes, I know it's a long shot that a crook could find the cars current location, but why take a chance.
Did I mention I HATE THIEVES!!?

[R 70 Judge]

Originally Posted by Transamric

Great thread! But I'm feeling the need to warn guys about posting their PHS copies showing the key codes. If your car still has the original lock cylinders, no big deal for a crook to make himself a set of keys. Yes, I know it's a long shot that a crook could find the cars current location, but why take a chance.
Did I mention I HATE THIEVES!!?

I appreciate the heads up. I had a spare set of keys made over the weekend and learned that neither key is original so I'm safe. Thank you

[cnc]

I have a 1970 only rear view mirror on its way [/QUOTE]


Is this with a chrome surround....?????
I may have one here as well unknowingly. I had a 70 as well years ago ..wondering....

[johnta1]

70 had a chrome back.
(side facing the front of the car)

[Formulabruce]

Originally Posted by johnta1

70 had a chrome back.
(side facing the front of the car)

All the ones I have owned were stainless.

[Formulabruce]

On the Rear ends. There was 2 different 12 bolt housings used on F body's in 1970.
One had a 5 leaf perch welded on it, for the Camaro SS.
I have only seen them in Big Bock cars though.
The second is a 4 leaf perch used on the Camaro
Z-28 ONLY, and all Pontiac Firebird applications.
These ALL had Chevy ratios, as they were/ are Chevy rear ends. Example would be a 3.07 ratio. In 71, in corporate rears, it would be a 3.08.
70 12 bolt Firebird 3.31 seems popular.

[Green Hornet]

Originally Posted by Formulabruce

All the ones I have owned were stainless.

70-72 were polished stainless.....but 70 had a specific clamshell clamp mount...

Repop 71-72 have chrome plated back...