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Seth Swoboda · 04-30-2024, 09:16 AM

Your '41 most likely has a 3.78 gear ratio. It seems like it's not happy at 55 mph but it can handle it with ease. I have ran a 3.78 with a stock 59A engine at 65 mph with no problems.

I do realize that the engine noise at 65 mph is more than most folks like. I usually install a 3.54 and have a '37 Ford with a 3.25. They go down the road easily with a few less RPM's.

A columbia is amazing. It will really make a difference in the car at highway or crusing speeds. The drawbacks are what Borded&Stroked mentioned. For me the cost is prohibative. Most of my cars wouldn't fetch $20,000 so spending 1/4 of the cars value for an overdrive is out. That is why I change gear ratios in the rearend and transmission. That is much cheaper. I daily drive a V8 Ford.

04-30-2024, 09:16 AM	#8
Seth Swoboda Senior Member Join Date: May 2010 Location: Southern Illinois Posts: 3,833	Re: Columbia two speed differentials Your '41 most likely has a 3.78 gear ratio. It seems like it's not happy at 55 mph but it can handle it with ease. I have ran a 3.78 with a stock 59A engine at 65 mph with no problems. I do realize that the engine noise at 65 mph is more than most folks like. I usually install a 3.54 and have a '37 Ford with a 3.25. They go down the road easily with a few less RPM's. A columbia is amazing. It will really make a difference in the car at highway or crusing speeds. The drawbacks are what Borded&Stroked mentioned. For me the cost is prohibative. Most of my cars wouldn't fetch $20,000 so spending 1/4 of the cars value for an overdrive is out. That is why I change gear ratios in the rearend and transmission. That is much cheaper. I daily drive a V8 Ford.