Decodeing the Chevelle

[FrankieZ]

Already Checked that....currently it has 3:55 's so im trying to find out what actually came from the factory.

FrankieZ

[YENKO DEUCE REGISTRY]

What is the dates on the ring gear? That might help to determine if the 3.55 is original or not.

[JoeG]

Your right there should be a date on the ring and pinion gear-----

[Don_Lightfoot]

Was 3.55 the standard ratio on an SS454 manual transmission car? If so, then I would say the 3.55's would be correct for a car where no "performance" or "economy" ratio was stipulated on the new car order form. Posi was an option on virtually any ratio.

If I recall, I'm sure I have seen LS-6's, let alone LS-5's, advertised with M22's and 3.31 rear end. All in the hands of the person putting in the order.

Just my two pennies worth.

[Alss]

My 70 SS LS-5 car...M-22..3.31 posi. Only two rear ratios for 70..3.31 Axle code CRV and 4.10.

ALbert

[COPO]

In '70 I think most of the M-22 cars got the 3.31 unless the optional 4.10 was ordered. My LS-6 conv. had the M-22 & the CRV 3.31 rear.

[SS4Real]

Yes, there is a good online site for your question. Check your rear axle code on the tube and then check this site:

http://www.chevellestuff.com/index.htm

Go to generic info, then click on axle codes/ratios. You will need to crawl under your car on the passenger side and look for the code on the front side of the axle tube. Then compare it to the code on the link above. My LS5 car with M22 has the CRV code which is 3:31.

[P.J.]

In my GM salesman handbook for 1970 Chevrolet year under
SPECIAL ORDER HIGH PERFORMANCE ENGINES
OPTIONS NO. AVAILABILITY DESCRIPTION TRANSMITTION OPTION REAR AXIL RATIOS ARE ALL LISTED. Cheque it out and I hope it will help, that is if I can scan the document so as to be able to read it
here goes.
suprss70