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Discussion Topic:
1938 Tudor sedan
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Twrench |
08-12-2026 @ 7:25 AM
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Member
Posts: 9
Joined: Jan 2019
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I was thinking about changing the gear ratio in my 38 sedan with a 69 hp driveline. Did Ford use the same differential in the 60hp and the 85hp drivelines with different attachments to the trans and rear differential. I would like some info on if I should proceed or call it a day. I would like to change it to a 3:55 gear or lower so I could get longer legs on trans. Thank you
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kubes40 |
08-12-2026 @ 7:44 AM
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Senior
Posts: 3669
Joined: Oct 2009
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Differentials were the same 85 vs. 60. If I understand you question correctly, you have the 60HP engine. If so, you do NOT want to install a lower ratio gear set. That little 60 won't be able to pull you away from a stop sign in the near future. If you have an 85HP engine, then you may want to. Is it worth the effort? To me, probably not. If the 85HP is stock, I would be very apprehensive to go with a ratio lighter than 3:78.
Mike "Kube" Kubarth
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Twrench |
08-12-2026 @ 11:33 AM
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Member
Posts: 9
Joined: Jan 2019
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Kubes, thank you for that bit of information on the rear diff. I will ponder your answer. Again thank you
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1934 Ford |
08-24-2026 @ 12:34 PM
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Senior
Posts: 584
Joined: Oct 2009
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I think they were mostly 4:11 in both V8's unless special ordered.
1934 Ford's since 1972
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carcrazy |
08-24-2026 @ 3:50 PM
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Senior
Posts: 2142
Joined: Oct 2009
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The standard rear axle ratio for the '38 Ford cars with the V-8 60 HP engine was 4.44:1.
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kubes40 |
08-24-2026 @ 5:01 PM
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Senior
Posts: 3669
Joined: Oct 2009
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carcrazy is 100% correct. 4:44
Mike "Kube" Kubarth
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