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Old 06-26-2018, 10:18 PM   #1
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Join Date: May 2016
Location: Houston, TX
Posts: 16
4.71 vs 4.56 gears

My 2003 Mach 1 is about to have a fresh rebuilt t56 installed. I have a McLeod clutch, FRPP billet steel flywheel, adjustable clutch cable with aluminum quadrant, and an MGW race shifter. The big question is, do I run 4.56 or 4.71 rear gears for the few years between now and boost? 4.56 would put 1st gear right around where it would be with 3.55 gears in a tr3650, and the rest of the gears would be fairly close to the same ratios as with 4.10 gears in a tr3650. 4.71 gears with the t56 would put 1st gear right around the same spot as 3.73 gears in a tr3650. Obviously, the rest of the gears in the t56 with a 4.71 rear gear ratio would pull a bit harder, and ride slightly higher in the rpm band, than 4.10 gears in the tr3650.
4.71 gears made by US Gear
4.56 gears made by FRPP
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Old 06-26-2018, 11:22 PM   #2
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Join Date: Dec 2003
Location: Cedar Park, TX
Posts: 19,294
I did 4.56s with the t56. My thinking was I drove mainly on the street and often times 1st with 4.10s and the 3650 was useless unless I wanted to burn some tires up.
11 Sterling gray GT500 coupe
08 Silver Z06 1058rwhp/1073rwt @ 15psi
14 Silver Q50S Vortech blown
04 DSG Mach 1 (stolen)
03 OW Mach 1 (sitting in a field rotting away)
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Old 06-27-2018, 12:48 AM   #3
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Join Date: Jun 2004
Location: Garden Grove, CA
Posts: 394
Re: 4.71 vs 4.56 gears

I have 4.56's w/ a T56 in my 03. Quick as can be on the street. Absolutely hate the freeway. Did I say it hates the freeway? Ha! Could not imagine any more gear...
03 Mach, Black, original auto, T56 as of 4/1/10
NA - 12.36@108.52 w/ 1.740 60' @ Fontana 1/15/06
N2O - 10.98@120.64 w/ 1.54 60' @ Famoso 11/17/07
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