Gm 12 bolt rear end decoder for windows

Pontiac used the same codes on firebirds as chevy used on camaros. History and identification of chevy 10 and 12 bolt chevy differentials. When it comes to chevrolet rearends, its the 12bolt that seems to get all. Cb g 112 1 e cb ratio, g plant, 112 112th day of year, 1 shift, e positraction sourcewhere would you find the actual ratio codes. Jegs carries a great selection of differential covers from trans dapt, mr. In actuality, the term 12bolt is due to the 12 bolts holding the ring gear to the differential. The 70 2wd and 7081 4wd have a 6 lug 12 bolt that is a couple inches wider, but will fit under a task force truck as long as you dont get too wild with wheeltire width. We offer a complete line of rear end parts for the gm 7. Although not technically how it got its descriptive name, the easiest way to identify a 12bolt rearend is obviously by the 12 bolts holding the rear cover in place. West coast differentials stocks a complete line of light duty axle parts for chevrolet, chrysler, dana, ford, gm, jeep and toyota and more. Should be marks on the housing, id rather just turn and count. Early ford beam axle identification and dimensions. Chevrolet 12bolt passenger car eaton posis we offer several versions of the most respected posi ever offered for the 12 bolt rear. Moser 12 bolt axles chevy rear 30 spline 31516 long gm 19661970 impala.

Bl 1122 g2 for a 68 or 69 model, this is interpreted as a 3. April 5th, 1967the gm9 is probably some kind of corp casting stamp id. Ok so does anyone have a book to tell what codes are what for the first two three digits. The 12 bolt rear end was introduced in the early 1960s and was used from 1964 to 1972 in gm. Complete installation kit for chevy 12 bolt passenger car. Although the 9 ford rear end has become the rear axle of choice for drag and circle track racing the 12bolt chevrolet still enjoys a fair degree of popularity. Ps the rearend is on the bottom of a pile of rearends and i hate to dig it out if it is a open rear end with highway gears. Differential rear end support covers provide strength as well as good looks over stock rear end covers. If you are looking for a posi rear end the gm 12 bolt can be made to fit, or the ford 9 inch is a favorite. The plus here for the 9inch is that if you break an axle inside the housing, the axle retainer will keep the axle in place. The rugged, reliable, and efficient chevy 12bolt has established itself as the preeminent rear differential for gm muscle cars since its debut in 1965. If the s10 had a v6 you might be able to leave the stock rear end in until it burns out.

A different 12 bolt differential was used for light truck applications and those 12 bolt units are not interchangeable. Richmond gear is the leading manufacturer of professional quality, high performance ring and pinion sets. Lighter and more efficient than its ford 9inch and dana 60 rivals, the 12 bolt enjoys as much use amongst brandloyal offroaders as it does. Kd 1 oo 9b is stamped on the passenger side axle, 12345 is stamped to the left of the 12 bolt cover and 1278 is stamped to the right of cover. Differential identification west coast differentials. Save chevy 12 bolt posi rear end to get email alerts and updates on your ebay feed. How to boxin a differential solid axle rear end housing. This includes replacing the gear set, the differential. Filthy motorsports carries a wide range of parts, gears, and upgrades for the gm 8. A jan, b feb, c mar, d apr, e may, f jun g july, h aug, i sep, j oct, k nov, l dec. Many of these differentials are now more than 40 years old and are due for an overhaul.

All listings current page auction buy it now classified ads. I learned a little about rear end codes some years ago. The housing cover can be identified from the pictures below. Finding a 12bolt rearend is a great stroke of luck. See how to install rear disc brakes on a classic gm muscle car. To begin with its a 1963 c10 swb, it has a 1968 250 inline six and a 19841986 t5 transmission. Buick and pontiac 10bolt rear ends use flangeretained axles instead of the cclip. Differential identification chart roadkill customs. I bought a 10 bolt gm rear end and was told it was from a second gen camaro it is stamped drivers side f115 also drivers side c2 passenger side 15 and the casting number is n 1249518 b i have looked at decode charts to no avail, any help would be appreciated. It wasnt that long ago when we put together an identification guide that distinguished the. After much research, crg is pleased to publish a comprehensive list of 6769 camaro axle codes.

The companys complete 12 bolt package was the first recommendation the technical department gave us, and we added to that a set of 3. The newly cast nodular iron housing is a direct replacement 12 bolt rear end for the 19641972 gm abody chevelle, malibu, gto, etc. Please call us to configure a bolt in rear end for your car 847 6631701. For 6 lug rear ends, the 6469 12 ton 2wd chevy and some gmc trucks have a 12 bolt rear, about 6061 wide i measure them where the wheels bolt on. That is, you can pull the axles and remove the center section from a 1964 model, bolt it into your 55 and drive it away there is one minor exception regarding positraction into a 556 and i will cover that later. The oldsmobile 12 bolt rear end o axle was used under most 19671970 cutlass, 442, hurstolds and vista cruisers. I dont have a list of the 78 firebird codes, but the 2. The guy that i got it from claims that it is a 1965 12 bolt rear axle assembly with new 3. The ring gear on the chevy 12 bolt measures in at 8. The rear axle ratio may be determined by finding the two or. The 12 bolt came in many different stock ratios, and it is a great donor candidate for gm owners wanting a differential with a lower ratio more economical to operate or for owners looking for a performance assembly for use with higher horsepower engines and racing applications.

We specialize in rebuilding, repairing, restoring and modifying rearends. However, the smaller 10bolt unfairly gained the reputation as a weak and inadequate rear end for highperformance applications. On a 12bolt, breaking an axle means it slides right out of the housing, causing massive sheetmetal damage along the way. I need to replace brakes, axle seals, possibly axle bearings and eventually go to 3. You can convert a 12bolt to the 9inch style of axle retention. Power window regulator for 20002005 chevrolet impala rear rh w. We specialize in efi, turbo and performance modification. Gm chevy 12 bolt chrome rear end cover camaro chevelle nova impala posi see more like this. Gm positraction rearends have been around since 1957, in several different ringgear diameters, but the 8. We can help you with all of the modifications needed.

The 5564 rear end center sections the case which bolts into the axle housing that contains the gears are all 100% interchangeable. A few other advantages the ford 9 has is that, well, it is larger than the chevy 12 bolt. Two rear end casting numbers have been found on 12bolt rear ends. The strongest 12 bolt rear end for the 19641972 gm abody chevelle, malibu, gto, etc. The pontiac codes consist of two letters for the axle ratio, four numbers for the. Dont think it matters much as far as you are concerned. This rear axle was available in gm s highperformance intermediate cars, fullsize vehicles and lightduty trucks. How to rebuild the 10 and 12 bolt, author jefferson bryant walks you through the entire process of disassembling, evaluating, and rebuilding the perfect differential for your gm. Svl gears for the gm 12t chevy 12 bolt truck rear end are dependable enough to be backed by a sixmonth or 50,000 mile warranty. Axle diff 4x4 front parts axle diff rear end parts rear chevy 12 bolt car rear chevy 12 bolt truck rear chevy gm 10.