General Motors transmissions
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==General Identification== | ==General Identification== | ||
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===Transmission identification by pan shape=== | ===Transmission identification by pan shape=== | ||
[[Image:Pan_id.jpg]] | [[Image:Pan_id.jpg]] | ||
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4L80E is a full electronic controlled and shifted transmission with similar design and strength to the T-400 trans. Early 4L80E and TH400 shared some parts that could be swapped. In 1996 the 4L80E has some design changes in lubrication circuits. You must be very careful when replacing gear train parts in late design 4L80E. | 4L80E is a full electronic controlled and shifted transmission with similar design and strength to the T-400 trans. Early 4L80E and TH400 shared some parts that could be swapped. In 1996 the 4L80E has some design changes in lubrication circuits. You must be very careful when replacing gear train parts in late design 4L80E. | ||
| − | ===6L80E | + | ===6L80E, 6L90E=== |
General Motors 6 speed automatic. While some parts swap between the 6l80 and 6l90, there are differences to watch out for, such as a longer case length for the 6l90 as well as larger output and spline count. Verses the 32 splines of the 6l80. | General Motors 6 speed automatic. While some parts swap between the 6l80 and 6l90, there are differences to watch out for, such as a longer case length for the 6l90 as well as larger output and spline count. Verses the 32 splines of the 6l80. | ||
[[File:6L90 trans.jpg|thumb|left|330px|6L90 transmission.]] | [[File:6L90 trans.jpg|thumb|left|330px|6L90 transmission.]] | ||
<br style="clear:both"/> | <br style="clear:both"/> | ||
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| + | ==Bellhousing bolt patterns== | ||
| + | The following is a list of GM bellhousing patterns: | ||
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| + | ===Chevrolet V8 pattern=== | ||
| + | [[image:Chevy_bell_pattern.jpg|thumb|300px|Chevy bolt pattern]] | ||
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| + | So named because it began with Chevrolet's V8 engines. | ||
| + | * Chevrolet small and big block V8 | ||
| + | * GM 90° V6 (200/229/4.3L) | ||
| + | * GM Iron Duke RWD inline 4 (early RWD variants, later versions may use a FWD pattern, and have two possible starter locations) | ||
| + | * Jeep with GM Iron Duke inline 4 2.5L/151cid (1980-'83). These use a MOPAR Torqueflite 904 automatic transmission with an integral Chevrolet bellhousing. Do not confuse with later AMC 2.5L engine that uses the GM metric pattern (see below). | ||
| + | * Chevrolet inline 6 (1963-up) | ||
| + | * Chevrolet 153 inline 4 (Chevy II, pre-Iron Duke, includes the Vortec 3000/181 industrial/marine crate engine) | ||
| + | * GM Atlas engine | ||
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| + | ===Buick, Oldsmobile, Pontiac (BOP) V8 pattern=== | ||
| + | [[image:BOP_bell_pattern.jpg|thumb|280px|BOP bolt pattern]] | ||
| + | * Post-1965 Buick/Oldsmobile/Pontiac RWD V8 | ||
| + | * Buick big block and 1963-up small block V8 | ||
| + | * Buick pre-3800 90° RWD V6 | ||
| + | * Jeep "Dauntless" 225cid oddfire V6 (1967-1974) | ||
| + | * Cadillac cast iron V8 after 1967 (1968-85 368, 425, 472 and 500cid V8) | ||
| + | ** Starters are on the driver side on Olds 350-455 and Pontiac, and the passenger side on Cadillac 425/472/500 and Buick 225/231/300/340/350/400/430/455. | ||
| + | <br style="clear:both"/> | ||
| + | ===Uni-bell pattern=== | ||
| + | This photo shows a multi-pattern case. Both the BOP and Chevrolet pattern on the same bell housing. | ||
| + | [[image:Multi_pattern_bell.jpg|thumb|left|300px|Uni-bell pattern]] | ||
| + | <br style="clear:both"/> | ||
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| + | ===GM metric pattern=== | ||
| + | [[File:GM 60deg V6 bellhousing.JPG|thumb|200px|GM 60 degree pattern]] | ||
| + | The GM metric pattern is also called the GM ''small corporate pattern'' and the ''S10 pattern''. This pattern has a distinctive odd-sided hexagonal shape. Rear wheel drive applications have the starter mounted on the passenger side of the block. The 2.2L S10/Sonoma had the starter located in the same position as front wheel drive cars. A rear wheel drive bellhousing is displayed at right. | ||
| + | * GM 60 degree V6 2.8/3.1/3.4/3.5/3.9L V6 (also used by AMC) | ||
| + | * Buick V6 3300/3800 V6 | ||
| + | * Cadillac 4.1/4.5/4.9L V8 | ||
| + | * Isuzu 3.5L DOHC V6 | ||
| + | * GM Iron Duke/Tech-4 2.5L inline 4 | ||
| + | * GM "122" 1.8/2.0/2.2L inline 4 | ||
| + | * AMC/Chrysler 2.5L inline-four engine found in Jeep Cherokee, Comanche, Wagoneer, CJ, Wrangler, and Dodge Dakota | ||
| + | * GM 5.3L LS4 V8 | ||
| + | * GM 3.5L LX5 V6 | ||
| + | <br style="clear:both"/> | ||
| + | ===Northstar pattern=== | ||
| + | [[File:Northstar2.jpg|thumb|300px|]] | ||
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| + | Nearly identical to the GM small corporate/metric pattern, except that the starter is located between the cylinder banks, and the lower right bolt hole is moved outward by roughly one inch. It shares the distinctive odd-sided hexagonal shape of the 60 degree metric pattern. | ||
| + | * Cadillac Northstar V8 | ||
| + | * Oldsmobile Aurora L47 V8 | ||
| + | <br style="clear:both"/> | ||
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| + | ===GM Ecotech=== | ||
| + | * GM [http://en.wikipedia.org/wiki/GM_Family_II_engine#Ecotec Ecotech] DOHC inline 4 | ||
| + | [[File:Ecotec2.jpg|thumb|center|400px]] | ||
| + | <br style="clear:both"/> | ||
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| + | ===Buick and Rover V8 pre-1964 "round" pattern=== | ||
| + | *1961 through 1963 Buick/Oldsmobile/Pontiac 215 aluminum V8 | ||
| + | *1967 through 2004 Rover V8 (based on the 215 Buick aluminum V8) | ||
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| + | ===Cadillac V8, pre-1967 pattern=== | ||
| + | Early Cadillacs manufactured before 1965 used a "round top" bellhousing very similar to early Buicks. Around 1965 the bellhousing pattern was revised until the BOP bolt pattern was adopted in 1968. | ||
==Speedometer== | ==Speedometer== | ||
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