Editing Rearend identification
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==Introduction== | ==Introduction== | ||
There are several ways to tell what the type/size/application of a rearend. Besides visually checking and comparing rearends to one another, there are casting numbers, build codes and dates displayed or cast/stamped in various locations on the rearend and elsewhere. These all can be used to help ID a rearend. | There are several ways to tell what the type/size/application of a rearend. Besides visually checking and comparing rearends to one another, there are casting numbers, build codes and dates displayed or cast/stamped in various locations on the rearend and elsewhere. These all can be used to help ID a rearend. | ||
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==Casting numbers== | ==Casting numbers== | ||
Many if not all rear end housings will have some sort of casting number or ID cues to identify it. If the RPO decal is present (newer vehicles) or the broadcast or "build" sheet is available, it can show what was originally in the vehicle. Sometimes body/fender/cowl tags contain coded info that may list specifics on the rearend. | Many if not all rear end housings will have some sort of casting number or ID cues to identify it. If the RPO decal is present (newer vehicles) or the broadcast or "build" sheet is available, it can show what was originally in the vehicle. Sometimes body/fender/cowl tags contain coded info that may list specifics on the rearend. | ||
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==Axle codes== | ==Axle codes== | ||
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*[http://www.thecamaro.com/Decoding/Chevy-Axle-Rear-End-Decoding/ Chevrolet Rear Axle Code Identification and Decoding] from thecamaro.com | *[http://www.thecamaro.com/Decoding/Chevy-Axle-Rear-End-Decoding/ Chevrolet Rear Axle Code Identification and Decoding] from thecamaro.com | ||
*[http://www.thecamaro.com/Decoding/Chevy-Axle-Rear-End-Decoding/Chevy-Full-Size-Rear-Axle-Codes.php Chevrolet Full Size and Impala Rear End/Axle Assembly Codes] from from thecamaro.com | *[http://www.thecamaro.com/Decoding/Chevy-Axle-Rear-End-Decoding/Chevy-Full-Size-Rear-Axle-Codes.php Chevrolet Full Size and Impala Rear End/Axle Assembly Codes] from from thecamaro.com | ||
+ | *[http://aplsweb.com/Topics/Differential.htm Various tid-bits, et cetera] from aplsweb.com | ||
*[http://tech.oldsgmail.com/axle_useage.php GM A-body codes] from tech.oldsgmail.com | *[http://tech.oldsgmail.com/axle_useage.php GM A-body codes] from tech.oldsgmail.com | ||
*[http://www.gnttype.org/numbers/axcodes.html Gear ratio info] from gnttype.org | *[http://www.gnttype.org/numbers/axcodes.html Gear ratio info] from gnttype.org | ||
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===Columbia 2-speed rear end=== | ===Columbia 2-speed rear end=== | ||
− | More of an overdrive unit than an actual rear end. Included in the Ford section since it was offered as an option on ' | + | More of an overdrive unit than an actual rear end. Included in the Ford section since it was offered as an option on '30's to '40's Fords. |
==General Motors== | ==General Motors== | ||
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====8.75 inch 10-bolt==== | ====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 | + | 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. |
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. | 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. | ||
− | + | [[File:8 3-4 gm diff.jpg]] | |
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− | [[File:8 3-4 gm diff.jpg | + | |
====8.5 inch 10-bolt==== | ====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. |
− | The 8.5" 10-bolt GM rearend has a 30 spline pinion, uses C-clips, and could have 28 or 30 spline axles depending on the year | + | The 8.5" 10-bolt GM rearend has a 30 spline pinion, uses C-clips, and could have 28 or 30 spline axles depending on the year. It uses a 1-1/4" pinion nut. |
<table bgcolor="#F9F9F9" table border="1" cellpadding="2" cellspacing="0"><tr> <td> Apollo: 1973 - 1975 | <table bgcolor="#F9F9F9" table border="1" cellpadding="2" cellspacing="0"><tr> <td> Apollo: 1973 - 1975 | ||
</td><td> Bel Air: 1970 - 1975 | </td><td> Bel Air: 1970 - 1975 | ||
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</tr><tr> | </tr><tr> | ||
<td> C10 1/2 Ton (2WD): 1979 - 1987 | <td> C10 1/2 Ton (2WD): 1979 - 1987 | ||
− | </td><td> C15/ C1500 1/2 Ton (2WD): 1979 - | + | </td><td> C15/ C1500 1/2 Ton (2WD): 1979 - 1990 |
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
− | <td> C1500 1/2 Ton (2WD): 1988 - | + | <td> C1500 1/2 Ton (2WD): 1988 - 1990 |
</td><td> Camaro: 1970 - 1981 | </td><td> Camaro: 1970 - 1981 | ||
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
− | <td> Caprice: 1970 - 1996 | + | <td> Caprice: 1970 - 1996 |
</td><td> Catalina: 1970 - 1981 | </td><td> Catalina: 1970 - 1981 | ||
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
<td> Chevelle/Malibu: 1973 - 1973 | <td> Chevelle/Malibu: 1973 - 1973 | ||
− | </td><td> | + | </td><td> Cutlas: 1970 - 1977 |
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
− | <td> | + | <td> Cutlas: 1985 - 1987 |
</td><td> El Camino: 1971 - 1976 | </td><td> El Camino: 1971 - 1976 | ||
</td> | </td> | ||
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</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
− | <td> Impala | + | <td> Impala: 1971 - 1988 |
− | </td><td> K10/ K1500 1/2 Ton (4WD): 1979 - | + | </td><td> K10/ K1500 1/2 Ton (4WD): 1979 - 1988 |
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
− | <td> K15/ K1500 1/2 Ton (4WD): 1979 - | + | <td> K15/ K1500 1/2 Ton (4WD): 1979 - 1988 |
− | </td><td> K5 Blazer (4WD): 1979 - 1991 | + | </td><td> K5 Blazer (4WD): 1979 - 1991 |
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
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</td><td> Skylark: 1970 - 1972 | </td><td> Skylark: 1970 - 1972 | ||
</td> | </td> | ||
− | + | </tr><tr> | |
<td> Skylark: 1975 - 1979 | <td> Skylark: 1975 - 1979 | ||
− | </td><td> | + | </td><td> Sonoma: 1994 - 1998 |
</td> | </td> | ||
</tr><tr> | </tr><tr> | ||
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==8.5" non C-clip rearend== | ==8.5" non C-clip rearend== | ||
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The 1971-'72 Buick GS/Skylark and Olds Cutlass A-body 8.5 10 bolt did not have C-clip axles. | The 1971-'72 Buick GS/Skylark and Olds Cutlass A-body 8.5 10 bolt did not have C-clip axles. | ||
The non C-clip 8.5" 10 bolt, type "C" rearend was used in some 1969-'72 Pontiac GP and 1970-'72 Monte Carlo. | The non C-clip 8.5" 10 bolt, type "C" rearend was used in some 1969-'72 Pontiac GP and 1970-'72 Monte Carlo. | ||
− | There have been non C-clip rearends found in Chevelle wagons | + | There have been non C-clip rearends found in Chevelle wagons through at least 1974. |
==12-bolt cover/10-bolt ring gear== | ==12-bolt cover/10-bolt ring gear== | ||
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==U-joints== | ==U-joints== | ||
− | *1310 series, (aka "small Chevy") has 1.063" diameter caps, 3.219" measured across to lock ring points (1-1/16" x 3-7/32"), uses outside clips. Was OEM for many 1967-74 GM cars. | + | *1310 series, (aka "small Chevy") has 1.063" diameter caps, 3.219" measured across to lock ring points (1-1/16" x 3-7/32"), uses outside clips. Was OEM for many 1967-74 GM cars.<br> |
− | {{Note1}}There's also a 1310 "special" U-joint, which has two 1-1/16" and two 1-1/8" caps. Used OE on some Fords and | + | {{Note1}}There's also a 1310 "special" U-joint, which has two 1-1/16" and two 1-1/8" caps. Used OE on some Fords and used as an adapter U-joint. |
*1330 series pinion yokes use locating tabs to center the U-joint, has 1.063" diameter caps, 3.625" measured across to lock ring points (1-1/16" x 3-5/8"), uses outside clips. Used on heavy-duty/high performance/big engine applications. | *1330 series pinion yokes use locating tabs to center the U-joint, has 1.063" diameter caps, 3.625" measured across to lock ring points (1-1/16" x 3-5/8"), uses outside clips. Used on heavy-duty/high performance/big engine applications. | ||
*GM 3R series is the "inside C-clip", or "inside lock" style. Used ~1975-up. It does not use locating tabs. It has 1.125" diameter caps, 2.5625" measured across caps (1-1/8" x 2-9/16"), aftermarket/replacement U-joints uses inside clips, originals use plastic injection. | *GM 3R series is the "inside C-clip", or "inside lock" style. Used ~1975-up. It does not use locating tabs. It has 1.125" diameter caps, 2.5625" measured across caps (1-1/8" x 2-9/16"), aftermarket/replacement U-joints uses inside clips, originals use plastic injection. | ||
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===15 series rearend=== | ===15 series rearend=== | ||
− | The AMC 15 series rearend has a 7-9/16" ring gear. It was used in 1965 and earlier models with 196 ci or 199 ci inline 6 engines. The small cars (cars other than those listed below as "big car") used the AMC 15 rearend with inline 6 engines, AMC 20 rearend was used with V8 engines. The AMC 20 rearend could be ordered in fleet cars with inline 6 engines | + | The AMC 15 series rearend has a 7-9/16" ring gear. It was used in 1965 and earlier models with 196 ci or 199 ci inline 6 engines. The small cars (cars other than those listed below as "big car") used the AMC 15 rearend with inline 6 engines, AMC 20 rearend was used with V8 engines. The AMC 20 rearend could be ordered in fleet cars with inline 6 engines. |
===20 series rearend=== | ===20 series rearend=== | ||
The big cars (Ambassador, Classic, Rebel, Matador and Marlin) used the AMC 20 rearend with 232 ci inline 6 and bigger engines. | The big cars (Ambassador, Classic, Rebel, Matador and Marlin) used the AMC 20 rearend with 232 ci inline 6 and bigger engines. | ||
− | The series 20 was used in Jeeps as well as AMC passenger cars. A Jeep 20 series rearend would have a 5 on 5" | + | The series 20 was used in Jeeps as well as AMC passenger cars. A Jeep 20 series rearend would have a 5 on 5" bolt pattern. Passenger cars used the 5 on 4-1/2" wheel bolt pattern. |
[[File:Amc 20 series rearend.jpg|thumb|450px|left|20 series under a 1966 Rouge]] <br style="clear:both"/> | [[File:Amc 20 series rearend.jpg|thumb|450px|left|20 series under a 1966 Rouge]] <br style="clear:both"/> | ||
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<tr height="13"> | <tr height="13"> | ||
<td>GH4</td> | <td>GH4</td> | ||
− | <td colspan="3" height="13"> Axle Rear | + | <td colspan="3" height="13"> Axle Rear</td> |
<td> | <td> | ||
<div align="center"> | <div align="center"> | ||
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<tr><td align="center">2.56:1</td><td align="center">41/16</td></tr> | <tr><td align="center">2.56:1</td><td align="center">41/16</td></tr> | ||
<tr bgcolor="#F1F1F1"><td align="center">2.73:1</td><td align="center">41/15</td></tr> | <tr bgcolor="#F1F1F1"><td align="center">2.73:1</td><td align="center">41/15</td></tr> | ||
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<tr><td align="center">3.07:1</td><td align="center">43/14</td></tr> | <tr><td align="center">3.07:1</td><td align="center">43/14</td></tr> | ||
<tr bgcolor="#F1F1F1"><td align="center">3.08:1</td><td align="center">40/13</td></tr> | <tr bgcolor="#F1F1F1"><td align="center">3.08:1</td><td align="center">40/13</td></tr> |