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EFV-8 Club Forum / 1940 Ford Discussion / Best rear axel ratio with a Columbia

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Discussion Topic: Best rear axel ratio with a Columbia -- page: 1 2

wmgmitchell

12-10-2013 @ 7:47 AM

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First, I really appreciate the expert advice I receive here. I'd be lost without it!

My 40 has a 4:11 with a Columbia overdrive. The car is constantly in overdrive which to me, defeats the purpose of having it. I want to change the ring and pinion to a higher and more reasonable ratio and would like to know what ratio you would suggest. At this point, I'm leaning toward 3:54.

Also, what speedometer gear should I use and will I get an accurate read when using the overdrive?

Bill

TomO

12-10-2013 @ 9:07 AM

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I would lean more towards a 3.78:1. A 3.54 would cause the engine to lug too much in overdrive for my taste.

Tom

trjford8

12-10-2013 @ 11:23 AM

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I agree with TomO. Use the 3.78.

ford38v8

12-10-2013 @ 11:27 AM

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I agree with Tom on the ratio. The turtle gear on you car with the 4.11 ratio should be a 21. Change this to a 19 if you go with the 3.78 ratio. These both would apply to 600x16 or 650x16 tires.

Alan

kubes40

12-10-2013 @ 3:54 PM

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Another vote for the 3:78. A great "all around" ratio in my opinion.
If you install the 3:54, what's the point of the over drive?

wmgmitchell

12-10-2013 @ 4:22 PM

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This is very very helpful!

So, would I be correct in concluding that 3:54 is probably a good choice in a vehicle without overdrive, and 3:78 is the best choice in a vehicle with a Columbia?

Bill

ford38v8

12-10-2013 @ 4:27 PM

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Not really, it depends on what kind of driving you do. 3.54 pretty much limits the fun driving to the flat highway, as it would be too sluggish around town, and no good in the mountains at all. 3.78, on the other hand, is a good all round choice for the car.

Alan

Kenneth M.

12-11-2013 @ 9:06 AM

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My 40 has 3:54 and It could stank a bit higher. I know a fellow that had 3:22 in his 39 and I road in the car it did very well. In fact he would run off from me. We live in mountains country.My 39 has 3:78 and on the interstate I could stand a bit higher gear to run with the traffic. 4:11 are not good for todays driving. My 40 using the GPS for driving when the car is at 55 the engine I can hear pretty good.

Kenneth M. Stewart

supereal

12-12-2013 @ 11:33 AM

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A 3:22 rear end? I've never seen one, nor is it listed in my parts books. In mountains, it would have to be run in low gear, or downhill only. C&G does show a 3:25 ratio for 35-48 Ford, 42-48 Merc, and 35-41 pickups. It would seem to require a very flat terrain, or a bigger engine than the stock flathead to get up to speed where it could outrun the stock ratios.

This message was edited by supereal on 12-12-13 @ 12:13 PM

kubes40

12-13-2013 @ 7:07 AM

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Hey Super, earlier this year I did some research on the 3:22 ratio gear sets. Although I never found any that were truly 3:22, I did find 3:25 and (1) 3:26. Ford did not make any 3:22 nor 3:25. At least none that I could find any records for.
I did this research as I have a mos matched pair of 3:26 gears that are 100% for certain Ford. It appears that set of gears (3:26) were experimental. Yes, they are Ford script (stamped) and the numbers etched in match (ring & pinion).
respectfully,
Mike Kubarth

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