10-31-2015, 06:41 PM
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CC Member
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Join Date: Sep 2002
Location: Grand Rapids,
MI
Cobra Make, Engine: FFR Challenge Car, RDI aluminum 427w
Posts: 355
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Not Ranked
SPF, 3.27 gears, 315/35-17, 427W & TKO-600 .64 5th.
I can cruise at 2,200rpm at 80mph on the expressway and the motor runs smooth and has power to pull away but not aggressive passing until the R's build up. The combo will also run 4th to 157mph at 7,000.
I'd still like a 6-speed because it has the .8x and .6x overdrives. Kinda puts an end to the question of whether the "right" trans gearing was purchased.
The weight may be a concern and the length of the T56 box may cause problems with some chassis configurations.
The T56 trans may shift better than the TKO-600, Tremec says it does and the shifting is my biggest complaint with the TKO-600. That's even after a Liberty Gear upgrade.
But then your mileage or preferences may vary.
Jim
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