Rear end gear ratio
 

Anyone ever run a 3:27 rear gear ratio?

Re: Rear end gear ratio
 

If one ever compared highway construction before 1930 as compared to today, one would see where many very early highways had very steep hills because of a lack of heavy duty earth moving equipment to smooth out hills and fill valleys; hence, cars had to be geared down to be able to climb these very steep hills and even very steep entrance driveways.

In my humble opinion, if changing out a rear end, providing such lowered vintage gear ratios in cars today make about as much sense as trying to fight WWIII with black powdered loaded single shot muskets.

Installed a new 3:27 (10) years ago in what so many refer to as an extra heavy 1930 Briggs Town Sedan; but, if one compares vehicles weight differences, one can see where Town Sedans are not extra heavy for a vehicle with wheels.

My car came with a Police head, but I removed the standard cam and substituted a Stipe 330 type cam; plus, changed to a B carburetor, and a B distributor.

With (5) passengers, lots of power even in today's modern, mild "so-called" steep hill country ...... plus with far less RPM's, I get 20 mpg in stop & go traffic.

If I ever finish my 1930 coupe, it will have nothing but a 3:27.

Hope this one opinion & experience helps.

Re: Rear end gear ratio
 

U can also try doing a search,, lots of info..

"3:27 ratio"

I wouldnt hesitate using it on any weight car, but do take in the fact if your doing a lot of mountain driving..

Re: Rear end gear ratio
 

Thanks for the reply
Thats what i was hoping I would hear
No mountians in southwest michigan
Just started on a 29 roadster
That sat for 51 years in corner mice kind of did a number on it

Re: Rear end gear ratio
 

Go for it....i put 3:54's in my tudor and am sorry i didnt go with 3:27

Re: Rear end gear ratio
 

I live in the mountains so I went with 3:54 gears in my 30 Coupe; running a engine with about 55 HP. Get good MPG, and do not have to down shift on hills.

Had I lived in flat, lower elevation, area would have gone with 3:27 gears.

Ron

Re: Rear end gear ratio
 

A little OT but not really.
I run an original 3.78 diff in the car I tow a camper weighing very nearly as much as the car around Australia with and a 26% Mitchell O/D and a Mitchell synchro gearbox (with 15% higher first and second gears). When towing, the 3.78 is handy on a hills or in towns but on the flat and in O/D, it is fine. I've even taken off from a stop (remember 15% higher first gear) and found I have forgotten to shift out of O/D.
By my calculations, a 3.78 diff with 26% O/D is the same as a diff ratio of 3.00 without O/D. If I can start from a stop with camper in tow with a diff ratio of 3.00, I figure 3.26 would be easy in a solo car. The 15% higher first gear makes my first gear even higher - like having a diff ratio of 2.61.:eek:

Re: Rear end gear ratio
 

I installed 3.27 gears in my friend's Wide Bed pickup, and hope to use 3.27 in my car someday. That and a 5.5 head and a counterweighted crankshaft will be the only changes from stock, but I feel they are the three best improvements.

I lied, I also use an electronic voltage regulator in my generator.:o

Re: Rear end gear ratio
 

I HAVE RAN 3:27 in my 31 tudor since 2001 I have a few upgrades check my site.