D&D Performance built T-56 with a Viper style Deep overdrive would be the way to go. Gets rid of all the weak links in the T-56 (shift forks and synchros) and has great ratios to work with a lower rear end ratio.
(248) 735-6220
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Chevy / Viper T-56
D&D Performance has been building and selling heavy duty 6 speed transmissions for Ford powered vehicles since 1993. In 1997 we introduced the first Viper T-56 gearset for Ford 5.0/5.8 applications and followed it up with a Viper unit for the 4.6 vehicles in 2000. We realized that there was a large void in the GM aftermarket T-56 area. Units on the market had gear ratios, input shafts, speedometer drives or shifter locations that were not suitable for retrofitting earlier vehicles. The D&D GM/Viper unit was introduced in 2002, and based on the reception it's received in the marketplace, it has very effectively solved the T56 retrofit problems with the following features:
650 lb-ft Torque Capacity
1.125 x 26T GM Input Spline
30T Viper Output Spline
Close Ratio w/ Deep Overdrives(2.66/1.78/1.30/1.00/.74/.50)
Carbon Fibre Blocker Rings
Steel 3-4 Shift Fork
Precision built and blueprinted by D&D technicians
Direct bolt-up to GM Saginaw/Muncie/T10 bell housings
Direct bolt-up to 4-Speed aftermarket steel bell housings
Accepts stock GM clutches,linkage,T.O.B.,pilot bearing,trans. mount
7T GM Mechanical Speedo Drive or Electronic Speedo Drive
