Quote:
Originally Posted by blucar
The big problem with re-gearing a differential, and/or installing oversize tires to increase ratio and lower RPMs is that the vehicle only has one ratio that might be fine for open road driving, however, in the city and/or mountains the vehicle will lack power requiring running the vehicle in second gear.
An over drive provides the best of two worlds, high gear ratio for open road use and low gearing when power is needed in the city or mountains.
I know several people that have fallen into this trap of not knowing that an OD vehicle has to have low differential gears in order to work properly...
A modern SUV/pickup will have 3.42 gearing with a conventional trans, an OD trans will have 3.73... The Ford F100's of the mid/late '50's had on the average 3.72 ratio with a standard trans, an OD trans had 3.89 which was the same ratio as a F100 4 x 4 .
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So that being said Blucar, Having 3:78 gears may be perfect when I add an overdrive (columbia or mitchell)..?
