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Transmission choice help

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Old 04-30-2013, 08:02 AM   #1
Join Date: Jan 2013
Vehicle: 2002 ford mustang gt
Location: Kentucky
Posts: 18
Default Transmission choice help

Hey guys,

Sorry for posting all of the time asking a lot of questions. I am trying to gather ideas for the new mustang build im doing.

Any how, my current question is if what transmission should I use? The engines torque peaks at around 738 @ 4800 but stay at or above 700 ft/lb past 3000 rpm. I am looking at a Hurst T-56 magnum. Will it hold up to the peak? I mean i know it's not that much more than the 700 it says it can handle but if torque is anything like horsepower then a little means a lot.

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Old 04-30-2013, 09:04 AM   #2
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Join Date: Dec 2006
Vehicle: 1998 SL500
Location: Saint Augustine, FL
Posts: 10,916

Power transmission products are almost universally rated by input torque; and Tremec's specs are generally very conservative. For example the 3650 is rated for 360 lb-ft, however people routinely put 450 to 550 (even 600) lb-ft through them.

I would not be concerned about applying 740 lb-ft to a T-56.

FWIW it's the 1st gear ratio that most affects input torque capacity. If you look at the specs for the TKO series you will see that those with the 3.27:1 1st gear are rated for 500 lb-ft, yet those with the 2.87 low gear are rated for 600 lb-ft; the only significant difference being the 1st gear ratio.

The T-56 used to be rated similarly (and very conservatively) at 600 and 650, for the 2.97 and 2.66 1st gears. However since they re-did their website they are all rated for 700 lb-ft.

A 3650 with a 2.87 1st gear (something I would like to have) would likely be rated for 430 lb-ft...
-cliff knight-
SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum,
Delta Force tuned, Steeda UDPs, Ralco flywheel,
RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq

Engineering is, at its base, making what you want from what you have.
At its extreme it is making what you want from what you can get.
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Old 05-01-2013, 09:30 AM   #3
Join Date: Jan 2013
Vehicle: 2002 ford mustang gt
Location: Kentucky
Posts: 18

Thanks for clearing that up.
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