Decodeing the Chevelle
 

Hi Folks
How would i find out what the rear axel ratio that would have come from the factory on my new toy(70 chevelle SS) the window sticker just says Option G80 Positraction Axle.

Is there a good reference site for this ?

heres the option list :
771 saddle interior
2B Vinyl Top-Black
A01 Tinted glass
A51 Bucket Seats
C08 Vinyl Roof Cover
D55 Center Console
G80 Positraction Axel
M22 Special 4 spd Transmission
T60 Heavy Duty Battery
U35 Electric Clock
U63 AM Radio
V01 Heavy Duty Radiator
ZL2 Cowl Induction Hood
Z15 SS 454 Equipment

FrankieZ https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Decodeing the Chevelle
 

Being an M22 car I'm gonna guess 4.10s... https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Decodeing the Chevelle
 

Well since you got your new toy I would go thru the whole car checking fluids---YOU should pull the rear cover off just to make sure no metal pieces are floating around--then count the teeth on the ring and pinion--Or jack up your car rotate the rear tire---ex.4:10 approimately ea. rotation of the tire would correspond to a 4.1 turn of the driveshaft etc.---If it was mine I would go thru the car---IMHO---

Re: Decodeing the Chevelle
 

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

FrankieZ

Re: Decodeing the Chevelle
 

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

Re: Decodeing the Chevelle
 

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.

Re: Decodeing the Chevelle
 

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

Re: Decodeing the Chevelle
 

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

Re: Decodeing the Chevelle
 

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.

Re: Decodeing the Chevelle
 

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.