boondocker

I'm trying to decipherer a stamped code on my '72 442/R350, "SA B354 1"...
any ideas?

J-(Chicago)

I believe SA is a type o 2.78 ratio,1967-1970. 12 bolt cover.

but I don't think that applies to an 8.5" (10 bolt cover), which should be what you have in the 72.

Sorry I am of little help.

J-(Chicago)

Check your cover. If it has 12 bolts, it might be a type o, or a Canadian chevy 12 bolt.
If it has a 10 bolt cover, disregard my last transmission.

2blu442

If it's original with 10 bolts on the cover my reference shows 2.73 with standard carrier, not a limited slip. John

boondocker

It's a 10 bolt, Cutlass S with the 442 appearance package...it also came with boxed control arms.

boondocker

Thanks...I was hoping for a posi 3.23

507OLDS

SA = 2:73 non-posi, B=Buick plant,354= 354th day of the year

boondocker

Thanks, right down to the day

Does anyone have tips on replacing the pinion and ring on this rearend...I'm wanting to go to 3.23...will the change make that much of a difference?

R350
compXE262
new comp springs and lifters
3 angle VJ, valve guides etc...stock 7A
Ruggles built quadrajet (performance)
stock intake (debating on rpm, not sure worth the $)
stock pistons and rehone (build measured out by builder and in spec)
crank ground 10k

507OLDS

You will notice a difference between the 2:73's & the 3:23's,but with a 350,and that build,I would put more gear in it.At least a 3:42,maybe a 3:73,depending on how/where you are plenning on driving the car.The don't offer any ratio between the 3:42 & the 3:73.

kenbarls

I am gonna try to search about this code and try to give you a decent informations about it. Keep in touch mate.