General Motors transmissions
(→4. Six Speed) |
(→4. Six Speed) |
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GM used three basic 6 speed manuals over the years. The ZF S6-40, the Borg Warner/Tremec T56, and the New Process/New Venture NV5600 in trucks | GM used three basic 6 speed manuals over the years. The ZF S6-40, the Borg Warner/Tremec T56, and the New Process/New Venture NV5600 in trucks | ||
| − | '''German ZF S6-40''' Starting with the 1988-96 Corvette, a German ZF 6-speed was used, designated S6-40. It was stout and reliable, but its limited use and short production run didn't support wide aftermarket solutions. In fact GM didn't even stock service parts for the transmissions, instead opting to provide remanufactured units instead of repairing them. Although it ended up costing GM less in the long run, it was a concept not warmly received by the public. Early models were rated for 400 ft-lbs, and later models were rated to 450 ft-lbs. ZF 6-speed ratios are as follows: | + | '''German ZF S6-40''' Starting with the 1988-96 Y-body (Corvette), a German ZF 6-speed was used, designated S6-40. It was stout and reliable, but its limited use and short production run didn't support wide aftermarket solutions. In fact GM didn't even stock service parts for the transmissions, instead opting to provide remanufactured units instead of repairing them. Although it ended up costing GM less in the long run, it was a concept not warmly received by the public. Early models were rated for 400 ft-lbs, and later models were rated to 450 ft-lbs. ZF 6-speed ratios are as follows: |
Reverse - 2.50 | Reverse - 2.50 | ||
| − | First - 2.68 | + | /First - 2.68 |
| − | + | /Second - 1.80 | |
| − | + | /Third - 1.29 | |
| − | + | /Fourth - 1.00 | |
| − | + | /Fifth - 0.75 | |
| − | + | /Sixth - 0.50 | |
And exploded view of an S6-40 transmission: | And exploded view of an S6-40 transmission: | ||
| − | [[ | + | [[http://i162.photobucket.com/albums/t264/curtis73/explodedZF.jpg]] |
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| + | '''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 gearsets 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 gearset regardless of rear axle ratio. 1992-1993 T56s with the lower gearsets had a slightly lower torque capacity in the 350 lb-ft range while 1994-later (high) gearsets reduced the sideloads 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. | ||
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| + | Of note is the fact that all T56 transmissions share an interchangable main case; even those found in Holdens, Fords, Vipers, and Aston Martins. What differs is the front adapter plate, tailshaft housing, shifter, and input/output shafts. Internally, there were some interchangable 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: | ||
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| + | 1993 F-body, 2.73:1 axle | ||
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| + | Reverse - 3.28 | ||
| + | /First - 3.36 | ||
| + | /Second - 2.07 | ||
| + | /Third - 1.35 | ||
| + | /Fourth - 1.00 | ||
| + | /Fifth - 0.80 | ||
| + | /Sixth - 0.62 | ||
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| + | 1993 F-body, 3.23:1 axle | ||
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| + | Reverse - 3.28 | ||
| + | /First - 2.97 | ||
| + | /Second - 2.07 | ||
| + | /Third - 1.43 | ||
| + | /Fourth - 1.00 | ||
| + | /Fifth - 0.80 | ||
| + | /Sixth - 0.62 | ||
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| + | 1994-current GM production ''edit when they quit using it'' | ||
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| + | Reverse - 2.90 | ||
| + | /First - 2.66 | ||
| + | /Second - 1.78 | ||
| + | /Third - 1.30 | ||
| + | /Fourth - 1.00 | ||
| + | /Fifth - 0.74 | ||
| + | /Sixth - 0.50 | ||
== Overdrive Units == | == Overdrive Units == | ||
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