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#1
07-13-2004, 11:48 PM
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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 
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98 vette conv Dyno at 410hp 01 BMW X5 03 Jaguar 1970 Chevelle LS5 
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#3
07-14-2004, 12:14 AM
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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---
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#4
07-14-2004, 12:18 AM
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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
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98 vette conv Dyno at 410hp 01 BMW X5 03 Jaguar 1970 Chevelle LS5
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#5
07-14-2004, 01:04 AM
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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.
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Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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#6
07-14-2004, 01:09 AM
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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.
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Specialized Chevrolet Decals
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#7
07-14-2004, 01:13 AM
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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
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#9
07-14-2004, 01:41 AM
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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.
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#10
07-14-2004, 01:56 AM
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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.
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Jim
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