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-   -   COLUMBIA with 3.78 gears (https://www.fordbarn.com/forum/showthread.php?t=175747)

motordr 08-14-2015 12:46 PM

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!

Pete 08-14-2015 12:49 PM

Re: COLUMBIA with 3.78 gears
 

I have done that with a 296 in a 32 coupe.
I didn't like it.

Dave/Green Bay 08-14-2015 01:06 PM

Re: COLUMBIA with 3.78 gears
 

Pete:
What didn't you like about it?
Thanks Dave/Green Bay

PeterC 08-14-2015 02:24 PM

Re: COLUMBIA with 3.78 gears
 

Quote:

Originally Posted by motordr (Post 1138947)
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.

JSeery 08-14-2015 02:44 PM

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.

Pete 08-14-2015 03:14 PM

Re: COLUMBIA with 3.78 gears
 

Quote:

Originally Posted by Dave/Green Bay (Post 1138961)
Pete:
What didn't you like about it?
Thanks Dave/Green Bay

It was geared too tall for passing in direct high.

Kube 08-14-2015 03:21 PM

Re: COLUMBIA with 3.78 gears
 

Quote:

Originally Posted by motordr (Post 1138947)
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.

jimTN 08-14-2015 03:56 PM

Re: COLUMBIA with 3.78 gears
 

Its gonna depend on where you live, flatland or mtns, urban driving or country.

hotcoupe 08-14-2015 04:32 PM

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. :eek: blast away! :)
tom

Kube 08-14-2015 05:19 PM

Re: COLUMBIA with 3.78 gears
 

Quote:

Originally Posted by jimTN (Post 1139069)
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.

Don 08-14-2015 06:27 PM

Re: COLUMBIA with 3.78 gears
 

3.78 in my 35 roadster Works greatin hills and on highway

supereal 08-14-2015 07:17 PM

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.

Kahuna 08-14-2015 07:54 PM

Re: COLUMBIA with 3.78 gears
 

I didn't know what a Columbia O/D reduction was? It has quite a drop in RPM.

Highboy34 08-14-2015 08:30 PM

Re: COLUMBIA with 3.78 gears
 

27% reduction as I remember.

PeterC 08-14-2015 08:35 PM

Re: COLUMBIA with 3.78 gears
 

Quote:

Originally Posted by Kahuna (Post 1139191)
I didn't know what a Columbia O/D reduction was? It has quite a drop in RPM.

per Columbia literature - 28.5% reduction

Bob G/Spanaway 08-14-2015 08:39 PM

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.

Kahuna 08-14-2015 10:49 PM

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

48 coupe 08-15-2015 07:34 AM

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.

PeterC 08-15-2015 07:37 AM

Re: COLUMBIA with 3.78 gears
 

1 Attachment(s)
Quote:

Originally Posted by Kahuna (Post 1139308)
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.

38 coupe 08-15-2015 08:57 AM

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.
http://img.photobucket.com/albums/v5...psmzpxugy8.jpg


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