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EFV-8 Club Forum / 1940 Ford Discussion / Rear End Ratios:

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fortyford

12-20-2020 @ 5:39 PM

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What were all the stock rear end ratios that came in the 40?I thought the 3.78 was pretty much the stock one?Am I correct on this?

kubes40

12-20-2020 @ 6:02 PM

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The 3:78 was by far the most common in the 85HP cars. The 95HP cars got a lot of them as well although some were fitted with a 3:54.
A 4:11 was also available.

The 60HP cars for the most part got the 4:44.

Mike "Kube" Kubarth

fortyford

12-20-2020 @ 6:40 PM

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Thanks,Kube.I guess a 3.54 would be hard to come by?

kubes40

12-21-2020 @ 6:06 AM

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They are reproduced. I do not know if they are quality or not.
Finding the real McCoy is a bit challenging. Mercury's often had them but to install in your ZFord requires a bit of modification.

Mike "Kube" Kubarth

JayChicago

12-21-2020 @ 9:36 AM

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One bloke's opinion, for what it's worth:

Changing to a 3:54 would gain some top-end speed, but sacrifice some low-speed acceleration. And do you really need to drive your car faster?

I remember reading a post from Kube in response to someone wanting an overdrive to keep up with modern highway traffic. Went something like this:
"I can see driving our cars at 70-75 MPH, but I can't see being able to stop or steer safely at that speed."

After reading that, I decided to just be happy driving the Interstate in the right lane at 50-55 MPH. I'm not in a hurry to get where I'm going; I'm doing what I love doing, driving my old car. As the traffic flies past, I wave back at people ogling the car and flashing thumbs up. No hurry to end the fun.

This message was edited by JayChicago on 12-21-20 @ 9:47 AM

kubes40

12-21-2020 @ 9:39 AM

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I'll still hold strong in that opinion

Mike "Kube" Kubarth

37RAGTOPMAN

12-21-2020 @ 3:44 PM

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I believe the rear end ratios depended were the car was sold,
I installed a 354-1 in my 37, and LOVE IT,
no problems driving it anywhere, even on hills
bought it from the EARLY FORD PARTS, they advertise in the V8 TIMES,
hope this helps, 37Ragtoman

kubes40

12-21-2020 @ 5:07 PM

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37rag,
Where did you gather this information from?

Quote: ("I believe the rear end ratios depended were the car was sold")

Mike "Kube" Kubarth

37RAGTOPMAN

12-22-2020 @ 3:42 PM

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Kubes40
if you lived in the hills like VERMONT, NEW HAMPSHIRE, etc
I would think you would have a 411 rear end ratio, to climb hills,
or if you lived in TEXAS, or flat lands, you would most likely have a 354 ratio,
if not,,, why did FORD and others have several ratios ?
as FORD EXAMPLE, had 354,378 411, why I ask my self that they supply these ?
it is a head scratcher for sure
my 2 cents 37Ragtopman

40 Coupe

12-31-2020 @ 7:11 AM

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The June 36 Ford Service Bulletin p 382 indicates: the 4.33 are used on passenger and commercial cars in mountainous territories the 3.78 ratio as standard , the 3.54 as optional, the 4.11 is the old standard until the 3:78 was adopted.
The Dec. 29, 1939 Ford Service Bulletin subject No. S-4000 p 1 indicates the Standard ratio of 3.78 and optional ratios of 3.54 and 4.11 for the 85HP vehicles of 1937-1940. The 60HP ratio of 4.44 except for commercial vehicles.

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