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Old 05-18-2014, 09:54 AM   #1
michaeluy
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Default correct matching of the transmission and differential

Hi,

I own a '71 Ford Mustang Mach 1,
I'd like to know the correct matching of the transmission and differential.

Currently, my differential and transmission don't match.

Thanks,

Mike
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Old 05-19-2014, 09:24 AM   #2
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Additional details:

351 Engine - Cleveland
Automatic Transmission C-6

Main Question: Compatible Ratio of Gears to Differential Gears for an automatic transmission C-6


Thanks
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Old 05-19-2014, 01:57 PM   #3
69mach1377
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What does the door tag say they should be?
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Old 05-19-2014, 09:41 PM   #4
michaeluy
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Hi 69mach1377,

When we acquired the car, it was formerly fitted with a automatic C4 transmission which matched with the differential gears.

The transmission was later changed to a C6 automatic transmission which now did not match with the differential.

The door tag specs were those of the C4 transmission

So I guess the question is: What is the correct gear ratio for the differential of my '71 Mustang Mach 1 (Cleveland) with C6 automatic transmission?

Thanks,

Mike
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Old 05-22-2014, 10:05 AM   #5
69mach1377
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Not sure it matters...the c4 and c6 probably have the same 1st, 2nd and 3rd gear ratios anyway. The difference is their ability to hold engine power with the c6 being stronger.
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Old 06-03-2014, 03:59 PM   #6
fastbackford351
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What do you mean it doesn't match? Do you mean not original?

I have a very not-original 351w with a C6 running on a peg-legged 8" w/ the 2.80 rear end. It isn't correct but it will absolutely scald the **** out of the tire doing the one wheel squeal.

As far as I know almost all rear axle ratios were available with either transmission. Maybe if you get into the hi-po stuff there were some limitations but by and large you could get any axle ratio you wanted depending on a few variables like whether your car has air conditioning

*sigh*
I really need to get off my *** and put in my trac-loc chunk.
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