General Motors transmissions
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===Borg Warner/Tremec T56=== | ===Borg Warner/Tremec T56=== | ||
| − | Starting with the 1992/1993 F-body (Camaro, Firebird, Trans Am) the six speed was a Borg Warner-designed, Tremec-built T56 transmission. Although the basic design, case, and internal operation were the same, three different ratio | + | Starting with the 1992/1993 F-body (Camaro, Firebird, Trans Am) the six speed was a Borg Warner-designed, Tremec-built T56 transmission. Although the basic design, case, and internal operation were the same, three different ratio gear sets were available in GM applications. In 1993, F-body cars were equipped with two optional rear axle ratios; 2.73 and 3.23. Beginning in 1994, all T56 cars used the same ratio gear set regardless of rear axle ratio. 1992-1993 T56s with the lower gear sets had a slightly lower torque capacity in the 350 lb-ft range while 1994-later (high) gear sets reduced the side loads on the case and were rated to 450 lb-ft. T56 use continued like this until 1997 when it also started being used in the Y-body (Corvette) as a rear-mounted transaxle, and continued on in F-bodies behind the LS1 until the end of their production. |
| − | Of note is the fact that all T56 transmissions share an | + | Of note is the fact that all T56 transmissions share an interchangeable main case; even those found in Holdens, Fords, Vipers, and Aston Martins. What differs is the front adapter plate, tail shaft housing, shifter, and input/output shafts. Internally, there were some interchangeable differences, like the type of shift forks and syncronizers used, but for the most part, all T56s are built on the same stout center section. Gear ratios are as follows: |
====1993 F-body, 2.73:1 axle==== | ====1993 F-body, 2.73:1 axle==== | ||
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===NV5600=== | ===NV5600=== | ||
| − | Designed by New Venture, this stout truck six speed is up to the task of living behind engines like the Duramax and 8100 Vortec. For obvious reasons it has little application in | + | Designed by New Venture, this stout truck six speed is up to the task of living behind engines like the Duramax and 8100 Vortec. For obvious reasons it has little application in hot rods due to its huge size, excessive weight, and truck-like gear ratios. |
[http://i162.photobucket.com/albums/t264/curtis73/IMG_1564-copy.jpg A photo of an NV5600] | [http://i162.photobucket.com/albums/t264/curtis73/IMG_1564-copy.jpg A photo of an NV5600] | ||
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===TH-400(3L80), THM-375C, THM-475(3L80HD)=== | ===TH-400(3L80), THM-375C, THM-475(3L80HD)=== | ||
| − | 1987-up 3L80HD is the HD version of the TH400 found in light trucks. It has 27 spline output shaft and is 34.5" long over all in 4x2 version. common tag code on these is LJA. Found cast on the | + | 1987-up 3L80HD is the HD version of the TH400 found in light trucks. It has 27 spline output shaft and is 34.5" long over all in 4x2 version. common tag code on these is LJA. Found cast on the bell housing in medium size letters is 'HD'. 1964-1990 are the years of the TH400 transmissions. 1987 was the year the transmissions were renamed to the new alpha-numeric values. |
==Four speed automatic== | ==Four speed automatic== | ||
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