What gears were available? Mine has a posi looking to check for code in the next couple days.Will be looking for a few parts later.Project that hasn't been checked yet.

 

Factory available ratios from the 1967 SPECS folder:



Additional dealer-installed ratios (4.11 and 4.33) from the 67 442 brochure:

 

Nice post Joe. I have many 66-67 Cutlass 442 parts cars. Email me direct or call with your needs and i will do my best to help you out.

Larry Moyer
Olds Parts and More
Redmond, OR
lemoldsnut@aol.com
calls west coast time 8 am to 8 pm 541-815-4363

 

yoU WILL NEED TO KNOW WHAT RATIO YOU HAVE IN THE REAR SO YOU CAN KNOW WHAT GEARS YOU CAN USE ON THE EXISTING CARRIER. or YOU WILL NEED TO ALSO REPLACE THE POSI CARRIER TOO. jIM

Geez sorry for the caps...Not yelling...

 

Thanks for all the replys guys.Joe you DA MAN!Ain't yelling just telling ya all. I am going to print that for future reference Joe.

 

On the right axle tube between the center carrier section and the right spring mount on the back side there will be a two letter code stamped usually upsidedown that if you provide it we can help with what it came with originally.

 

Okay i will check it.I took it where it can be put on a lift.Just haven't got to check it yet.As soon as i do i will post the code.

 

Looks like a 61 near the center section and more out board a os .

 

I don't find an os but there is an SO and that is for an open (non-posi) 3:23 rearend. A common set up in 70

 

It is a posi has the tag. Spin the wheels both move. I didn't find a os also

 

Pull the cover and get info off the ring gear.

 

Okay that is kinda what i was thinking.Thanks for reply's

 

My 67 TC has no stamping on the housing that I could find. Its a 12 bolt cover 308 posi... not original to the car.

 

Man oh man after even more cleaning the letters are not what i thought.It is with out a doubt SC T9 wouldn't that be a 308?

 

Yes 3:08 non-posi. If it is a posi then it was added. I would still pull the cover and count the teeth on the ring and pinion gears. you will see first hand if it is a posi.

 

here is the codes as I have them.

70 Olds axle codes

Standard type differential
code
R2 2.56
SA 2.78
SC 3.08
SE 3.23
S1 2.56
TA 2.78
SM 3.08
SO 3.23

LIMITED SLIP

R3 2.56
SB 2.78
SD 3.08
SF 3.23
SH 3.42
SJ 3.91
YM 3.42
T0 3.91
ST 2.56
TB 2.78
SN 3.08
SP 3.23

ALUMINUM LIMITED SLIP DIFFERENTIAL

SV 3.23
SX 3.42
SZ 3.91

 

Pulling the cover and reading the tooth count is by far the preferred method to find what you actually currently have in any differential. Check condition, refresh the fluid, etc.

 

Yes sir next on my list of things to do.

 

Update numbers on axle rear end housing say it was a 308 .After pulling cover and counting teeth it must be a after market gear it does have a posi unit.The gear is a 390 man am i happy to find that.