| flathead48 | -- 06-17-2010 @ 4:58 AM |
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Can anyone tell me what the rear gear ratio for a 50 Ford, 3 speed no overdrive should be. Thanks Rick
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| Kens 36 | -- 06-17-2010 @ 6:27 AM |
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Rick, The standard passenger car ratio, without overdrive, was 3.73 to 1. Ken
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| flathead48 | -- 06-17-2010 @ 1:11 PM |
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Thanks Ken for the info.
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| wmsteed | -- 06-18-2010 @ 8:50 AM |
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The gear ratio for a vehicle equipped with an OD is always lower than a non-OD vehicle... As a comparison, the '58-59 Ford pickup had an OD ratio of 3.89 compared to 3.72 standard gearing. The same is true on modern cars with AOD transmissions. Vehicles equipped with automatic transmissions usually have higher gear ratio's because the automatics multiply the torque better, therefore higher gear ratio's are used in vehicles with AT's Many people make the mistake of installing OD transmissions, either AOD or conventional on standard gearing, only to find out the vehicle is underpowered in OD. My brother has a very nice '54 **** that has been converted to V8, AT, and diff from a Nova. The car ran great, then he got talked into to putting a 200R4 in it. He can't drive the car in OD at speeds less than 65 mph. The slightest hill requires a manual down shift to D from OD. My '36 Ford has a Columbia with 3.78 in lieu of the more conventional 4.11, however, my engine is a highly built 59AB which pulls the 3.78's with ease in the 65 mph range, in hilly areas, or if I need performance, I just shift down to under-drive. Opps..... misread the question... I thought the question was asking for OD gearing... Sorry about that. Bill 36 5 win delx cpe This message was edited by wmsteed on 6-18-10 @ 8:52 AM
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| supereal | -- 06-18-2010 @ 10:03 AM |
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My experience with my '47 with overdrive is similar to Bills. I have a 3-78 rear, and selected a 33% unit. It allows driving at highway speeds in the 65-70 range, but pulls down the engine much below 40 mph. If you add an overdrive to your older car with a 3-78, a 30% reduction ratio would give you more flexibility. Be aware that if you do plan to travel at 65-70, have the brakes, tires, and steering in top shape to match the ability to go that fast.
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