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Old 08-14-2015, 12:46 PM   #1
motordr
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Default 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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Old 08-14-2015, 12:49 PM   #2
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Default 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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Old 08-14-2015, 01:06 PM   #3
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Default Re: COLUMBIA with 3.78 gears

Pete:
What didn't you like about it?
Thanks Dave/Green Bay
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Old 08-14-2015, 03:14 PM   #4
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Default Re: COLUMBIA with 3.78 gears

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Pete:
What didn't you like about it?
Thanks Dave/Green Bay
It was geared too tall for passing in direct high.
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Old 08-14-2015, 02:24 PM   #5
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Default Re: COLUMBIA with 3.78 gears

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Originally Posted by motordr View Post
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!
Just a comment to consider in your thinking .. Flywheel should be a factor as well - I have a strong 284cu (supercharged) with 4:11 and Columbia with an aluminum flywheel. I my case the 4:11 is great for around town performance and easy launch with the benefit of the 2:97:1 high for lower (28.5% reduction) in RPM at 65mph. I am happy with this combo with the lighter flywheel.

Last edited by PeterC; 08-14-2015 at 03:24 PM.
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Old 08-14-2015, 02:44 PM   #6
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Default Re: COLUMBIA with 3.78 gears

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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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Old 08-14-2015, 03:21 PM   #7
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Default Re: COLUMBIA with 3.78 gears

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Originally Posted by motordr View Post
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!
I have installed more Columbia's than I care to recall. The best overall performance in my opinion was attained when coupled to the 3:78.
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Old 08-14-2015, 03:56 PM   #8
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Default Re: COLUMBIA with 3.78 gears

Its gonna depend on where you live, flatland or mtns, urban driving or country.
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Old 08-14-2015, 05:19 PM   #9
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Default Re: COLUMBIA with 3.78 gears

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Its gonna depend on where you live, flatland or mtns, urban driving or country.
Good point... around here, lots of hills. None too steep but many are very long.
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Old 08-14-2015, 04:32 PM   #10
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Default 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!
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Old 08-14-2015, 06:27 PM   #11
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Default Re: COLUMBIA with 3.78 gears

3.78 in my 35 roadster Works greatin hills and on highway
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Old 08-14-2015, 07:17 PM   #12
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Default 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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Old 08-14-2015, 07:54 PM   #13
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Default 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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Old 08-14-2015, 08:35 PM   #14
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Default Re: COLUMBIA with 3.78 gears

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I didn't know what a Columbia O/D reduction was? It has quite a drop in RPM.
per Columbia literature - 28.5% reduction
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Old 08-14-2015, 08:30 PM   #15
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Default Re: COLUMBIA with 3.78 gears

27% reduction as I remember.
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Old 08-14-2015, 08:39 PM   #16
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Default 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.
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Old 08-14-2015, 10:49 PM   #17
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Default 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
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Old 08-15-2015, 07:37 AM   #18
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Default Re: COLUMBIA with 3.78 gears

Quote:
Originally Posted by Kahuna View Post
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
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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Old 08-15-2015, 09:09 AM   #19
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Default Re: COLUMBIA with 3.78 gears

so 38 Coupe - with your chart (thank you very much!) 2354rpm @ 65mph is indicated for a 4:11gear and Columbia in high with a 28" tire - so both Kahuna and I are in sync at the "guestimated" 2300 rpm at 65mph - although with my 30" tire I am probably a tad lower rpm at 65mph - nice to know.
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Old 08-15-2015, 07:34 AM   #20
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Default 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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