47 Super diff gear ratio

My 47 Super seems to have a tight gear ratio(my guess is over 4 to 1).I have a 48 parts car ,if I want to use it for replacement ring and pinon.My vin in the 47 is 44659593.Can I identify the gear ratio from it.

Does the parts car have Dyna Flow? If not a rear end from one of the 50's Buick should be researched.

Straight -eight

Both are three speed manual trannies.Would the rear end from a 48 or later dyna-flow offer a more road friendly ratio.Can anyone tell me what ratio my super currently has.

Richard

Hi,

I owned a '50 Super stick shift that the dealer installed a Dynaflow rear axle assy in after a rear end collision. It was a great road car with the higher ratio, not only speed wise but also with gas mileage. The car would run 85 mph in second gear without a problem. I'd check on a later Dynaflow equipped car for a whole rear axle assy. I think that'd help you a lot.

kaycee

Here are different ratios on Buick cars.

Leif in Sweden.

From 1940 to 1955 the differentials would interchange. The later V8 dynaflow Buicks had 3,4-3,6 ratios and were much better for travelling.

Richard, if it is like my '50 , it is marked on the BOTTOM of the differential housing.

Probably a 4.1/1.

Ben

kaycee---interested in yr experience with the rear end swap. so you got good top end and it still moved off the line ok?

and it ran easy in third? I think i will try it