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Author Topic: 1970 mach1diff ratio  (Read 1186 times)

Offline Brisbane

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1970 mach1diff ratio
« on: October 31, 2019, 09:37:05 PM »
Hi, the car is 1970 mach1 m code built in metuchen. 3speed fmx box.
What should the rear diff ratio be i believe its been played with.
Please assist , thanks Jeff
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Offline carlite65

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Re: 1970 mach1diff ratio
« Reply #1 on: October 31, 2019, 09:55:57 PM »
what does the door data sticker say? is it still there??
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5F09C331248

Offline Brisbane

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Re: 1970 mach1diff ratio
« Reply #2 on: November 01, 2019, 04:58:33 AM »
Nope . Nothing , well its been painted over.
Ive been told that it should 3.00
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Offline ExportMach

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Re: 1970 mach1diff ratio
« Reply #3 on: November 05, 2019, 04:46:36 PM »
Jeff,
Your Mach should have a 3.25 as the std. ratio for an M code w/ the FMX. The 3.00 is the std. ratio is for M code Mustangs other than the Mach or Mustang w/ Ram-Air that also have the FMX.
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Mark C
Ford T5 registrar www.FordT5.com
MCA certified judge - '69-'70 concours
1970 Mach 1 T-5; bucked Mar 1970
0F05H172XXX; 63C, 6, 3A, 91, 6, 1

Offline J_Speegle

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Re: 1970 mach1diff ratio
« Reply #4 on: November 05, 2019, 08:23:18 PM »
Did AC play a part in these cars like they did for rearend ratios on other applications?

Asking since that has not been included or asked for already
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Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline 70-Conv_4sp

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Re: 1970 mach1diff ratio
« Reply #5 on: November 06, 2019, 09:24:41 PM »
Quote from: J_Speegle on November 05, 2019, 08:23:18 PM
Did AC play a part in these cars like they did for rearend ratios on other applications?

Asking since that has not been included or asked for already

I think it did from what I have researched/learned, my 70 Cougar w/351c, 4 speed and A/C came stock with 3.00 open rear end ratio. I think also had to do with emissions, specially California cars (which mine is) and Ford didn't want to spin the A/C clutch at to high of a rpm also 
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Offline 70cj428

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Re: 1970 mach1diff ratio
« Reply #6 on: November 07, 2019, 11:42:50 PM »
Quote
Did AC play a part in these cars like they did for rearend ratios on other applications?

Not 100% sure about small blocks , but (at least from 68-70) 390 and 428 cars with air all got 3:00/1 rear end ratios  (only option was Trac Loc)  The only exception I'm aware of were the 11 1970 428 4 speed AC mustangs, they had 3:25/1 rears …..

Shelbys may be another exception ….
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