Rearend identification
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===10 bolt=== | ===10 bolt=== | ||
| − | ==== | + | =====10 bolt ID tips===== |
| − | + | If you don't have the codes on hand to identify if a 10 bolt rear end is an 8.5" or not, you can measure the distance between the very bottom bolt for the cover and the next adjacent bolt (either right of left), it will be 3-3/4" for a 8.5" and 3-1/4" for a 7.5".<br> | |
| − | + | {{Note1}}Some installation kits for the 8.5" and 7.5" use ring gear bolts with a 5/8" head, so if someone has rebuilt the rearend with one of these kits the bolts will have smaller heads than the original bolts. | |
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| − | ====8. | + | Another [http://www.hotrodders.com/forum/need-id-gm-10-bolt-163067.html#post1571160 tip] is to check the size of the pinion nut. The 8.2" uses a 1-1/8 inch socket on the nut and the 7.5" and 8.5" use a 1-1/4 inch socket. That is as long as they have a OEM type nut on them. |
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| + | There are usually two distinctive lugs cast into the bottom of the 10 bolt rear end housing. These lugs are arrowed in the image above. | ||
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| + | The ring gear of the corporate 10 bolt is secured by 7/16-20 '''left hand''' thread bolts having a 3/4" hex head on them; there will be ten bolts holding the ring gear to the differential. The ring gear is (as mentioned) 8.5" diameter and the pinion shaft diameter is the same as the 12 bolt at 1.625". The 8.5" pinion has 30 splines. | ||
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| + | The 8.2" diff will have 10 bolts holding the ring gear on the diff, the bolts will have a 9/16" hex head and be right hand threaded. The 8.2" uses ten 3/8-24 right hand thread bolts to hold the ring gear on the diff. The pinion diameter is 1.438", having 25 splines. | ||
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| + | The 7.5" diff will have the ring gear secured with 10 bolts that are 7/16-20 LH thread, like the 8.5" corporate rear end. However, the ring gear diameter is smaller than the 8.5" differential. | ||
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| + | ====8.75 inch 10-bolt==== | ||
| + | This rearend was used in some mid-'70s Chevrolet station wagons, Impala, Caprice, some Chevelles, El Caminos, usually with larger engines (SBC 400 or BBC) and possibly in some Cadillacs. Also found in some Pontiac LeMans and some 1977 Buick Regals. | ||
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| + | Can be found with either 28 or 31 spline axles. It has a 10-bolt cover with indentions next to the axle tubes and 12 bolts holding the ring gear to the carrier (the bolts have a 3/4" hex head, right hand threads). The pinion nut is 1-1/4", it has 3" axle tubes. | ||
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| + | [[File:8 3-4 gm diff.jpg]] | ||
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| + | ====8.5 inch 10-bolt==== | ||
Sometimes referred to as the "corporate 10-bolt", the GM 8.5" 10-bolt rearend began production in 1971 to replace the 8.2" and 12-bolt rearends. There was simultaneous use of the 8.2" and 8.5" rearends during the changeover period, like in the Nova. Has a 10 bolt cover as well as 10 bolts securing the ring gear. | Sometimes referred to as the "corporate 10-bolt", the GM 8.5" 10-bolt rearend began production in 1971 to replace the 8.2" and 12-bolt rearends. There was simultaneous use of the 8.2" and 8.5" rearends during the changeover period, like in the Nova. Has a 10 bolt cover as well as 10 bolts securing the ring gear. | ||
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</tr> </table><br> | </tr> </table><br> | ||
| − | ====10 bolt | + | ====8.2 inch 10-bolt==== |
| − | + | The 8.2" rearend was used through 1970 in the B-body (Impala) and F-body (Camaro) cars. The 8.2" was used through 1971 in the X-body (Nova) and through 1972 in the A-body (Chevelle). | |
| − | + | <table bgcolor="#F9F9F9" table border="1" cellpadding="2" cellspacing="0"><tr> | |
| − | + | <td> Bel Air: 1964 - 1972 | |
| − | + | </td><td> Biscayne: 1964 - 1972 | |
| − | + | </td> | |
| − | + | </tr><tr> | |
| − | + | <td> Camaro: 1967 - 1970 | |
| − | + | </td><td> Caprice: 1965 - 1971 | |
| − | + | </td> | |
| − | + | </tr><tr> | |
| − | + | <td> Chevelle/ Malibu: 1964 - 1972 | |
| − | + | </td><td> Chevy II: 1964 - 1968 | |
| + | </td> | ||
| + | </tr><tr> | ||
| + | <td> El Camino: 1964 - 1972 | ||
| + | </td><td> Impala: 1964 - 1972 | ||
| + | </td> | ||
| + | </tr><tr> | ||
| + | <td> Monte Carlo: 1970 - 1972 | ||
| + | </td><td> Nomad: 1968 - 1972 | ||
| + | </td> | ||
| + | </tr><tr> | ||
| + | <td> Nova: 1964 - 1972 | ||
| + | </td><td> Skylark: 1964 - 1969 | ||
| + | </td> | ||
| + | </tr><tr> | ||
| + | <td> Tempest: 1964 - 1970 | ||
| + | </td><td> Trans Am: 1969 - 1972 | ||
| + | </td> | ||
| + | </tr><tr> | ||
| + | <td> Ventura: 1971 - 1971 | ||
| + | </td><td> Wildcat: 1964 - 1972 | ||
| + | </td> | ||
| + | </tr> </table><br> | ||
====10 bolt carriers==== | ====10 bolt carriers==== | ||
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