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08-14-2015, 12:46 PM | #1 |
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COLUMBIA with 3.78 gears
I would like to hear from anyone that is running a Columbia with 3.78 gears. How do you like it? I am thinking of this for a 32 3 window with a healthy 265 flathead, but with stock wheels and tire size. I have a 4.11 Columbia in my other car and am thinking of going up a step in the gear ratio for this one. Looking for your actual experience on this setup. Thanks!
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08-14-2015, 12:49 PM | #2 |
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Re: COLUMBIA with 3.78 gears
I have done that with a 296 in a 32 coupe.
I didn't like it. |
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08-14-2015, 01:06 PM | #3 |
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Re: COLUMBIA with 3.78 gears
Pete:
What didn't you like about it? Thanks Dave/Green Bay |
08-14-2015, 02:24 PM | #4 | |
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Re: COLUMBIA with 3.78 gears
Quote:
Last edited by PeterC; 08-14-2015 at 03:24 PM. |
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08-14-2015, 02:44 PM | #5 |
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Re: COLUMBIA with 3.78 gears
I would think that the 4:11 gearing would be the better selection. As everyone (so far) is saying good option for both in town and highway. Unless you drive almost exclusively on the highway at high speeds on fairly flat ground not sure why you would want a higher rear end gear when you have an OD.
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08-14-2015, 03:14 PM | #6 |
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Re: COLUMBIA with 3.78 gears
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08-14-2015, 03:21 PM | #7 | |
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Re: COLUMBIA with 3.78 gears
Quote:
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08-14-2015, 03:56 PM | #8 |
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Re: COLUMBIA with 3.78 gears
Its gonna depend on where you live, flatland or mtns, urban driving or country.
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08-14-2015, 04:32 PM | #9 |
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Re: COLUMBIA with 3.78 gears
i have a Columbia in my `37 1/2 ton with a 22 lb. flywheel on a 239 c.i. motor, single 94 with a Max-1 and a 28 tooth cluster and a 3:78 r&p with 7.00 x 16". and after 4,000 miles, i wouldn`t change a thing. and i know my next statement is going to get a response . . . # 41 jets in the carb. blast away!
tom |
08-14-2015, 05:19 PM | #10 |
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Re: COLUMBIA with 3.78 gears
Good point... around here, lots of hills. None too steep but many are very long.
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08-14-2015, 06:27 PM | #11 |
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Re: COLUMBIA with 3.78 gears
3.78 in my 35 roadster Works greatin hills and on highway
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08-14-2015, 07:17 PM | #12 |
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Re: COLUMBIA with 3.78 gears
My '47 convertible has a 3:78 rear, and an overdrive with a 33 percent reduction. it is fine above 45 mph, but lugs below that. It will run at hiway speeds of 60 to 70 mph, which pushes the stock handling and braking to limit. What you select must be based on the intended use, lots of hiway, or mostly city, because the balnce is tricky to reach.
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08-14-2015, 07:54 PM | #13 |
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Re: COLUMBIA with 3.78 gears
I didn't know what a Columbia O/D reduction was? It has quite a drop in RPM.
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08-14-2015, 08:30 PM | #14 |
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Re: COLUMBIA with 3.78 gears
27% reduction as I remember.
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08-14-2015, 08:35 PM | #15 |
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Re: COLUMBIA with 3.78 gears
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08-14-2015, 08:39 PM | #16 |
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Re: COLUMBIA with 3.78 gears
I have had 3.78/Columbia in both my coupe and PU for around 10 years.
Just '040 over 239 with dual 97's, heads and mild cams. They work great in all kinds of driving. Wouldn't change a thing...except maybe the 25 tooth Zephyrs in my coupe. |
08-14-2015, 10:49 PM | #17 |
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Re: COLUMBIA with 3.78 gears
PeterC
What is your rear tire size? Diameter? On my 32, I have a Gear Vendors O/D that reduces the final ratio from 4.11 to 3.21. My tires are 29 to 29 1/2" tall. In O/D at 65 mph, my engine turns about 2300 rpm. Wondered what yours is? Thanks, Jim |
08-15-2015, 07:34 AM | #18 |
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Re: COLUMBIA with 3.78 gears
My 48 has 3.78 columbia max 1 cam 259 ci. offey heads. 2 ecg carbs. 51 jets. light flywheel. pulls good. I think it's a good set up.
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08-15-2015, 07:37 AM | #19 |
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Re: COLUMBIA with 3.78 gears
Rear tire diameter looks like 30" to me - Tire is Coker Firestone bias 700 X16 - I do not have a tach but guess is 2300 rpm sound reasonable.
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08-15-2015, 08:57 AM | #20 |
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Re: COLUMBIA with 3.78 gears
There have been so many discussions about rear axle gear ratios and overdrive that I put together a spreadsheet showing the most discussed combinations. I set the color bands based on my driving experiences with a 3.78 axle, no overdrive car. Obviously other people will have different opinions about comfortable rpm ranges. These calculations are accurate for 1:1 ratio in the transmission and a 28 inch tall rear tire.
I hope this image is readable. Last edited by 38 coupe; 08-15-2015 at 09:08 AM. Reason: Attempting to get the table clear enough to read... |
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