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Re: rearend gear ratio and type of a 76 ford f250
Judging by those numbers, gear ratio is 3.31. You can test this theory, by blocking the front wheels and jack the rear end up enough to get the tires off the ground. Then mark one tire with chaulk for a reference and also the drive shaft. rotate the driveshaft one full revolution and the tire should make basically 3 and a third revolutions.
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If you take the VIN # to a GM dealer they should be able to tell you the original rear end that the vehicle came with. If you are going to take the rear end to a shop they will be able to tell when they take it apart. If it is a posi rear end it will have a tag under one af the cover bolts (if it has not been removed) Once inside a posi rear end is immediately identifiable from the clutch pack. Also the number of teeth is stamped on each (pinion and ring) gear. Divide ring gear # by Pinion gear # to get rear end ratio. Didn't get directly to your question, but I hope this helps. Let me know. Thanks
Hello, If the tag is not present, you can get a rough estimate by putting a chalk line on the tire and on the drive shaft. With the vehicle jacked up spin the wheel and see how many times the drive shaft spins with a full tire rotation. If the shaft spins about 3 3/4 times you probably got the 3.73. If it spins a little over 4 times you probably got the 4.10. To get it exact you can remove the differential cover and count the teeth on the ring gear and pinion gear then divide the two to get the ratio. On the back of the rear differential there's a metaltag sticking out, with various numbers on it, like 8.8 for the 8.8" rear end, and probably a 3 73 or 4 10 for gear ratio. If there's a L between the numbers 3 L 73 then it is a limited slip. Also, the sticker in your door jamb will have info on it. One section will have the Axle code, 97 or R6 or something. The 8.8 should be plenty of enough axle for your motor but you can not go wrong with a ford 9 inch though becuase this will axle will handle any amount of horsepower you throw at it and the axles are easy to replace as well. I hope this fixes your problem.
there should be a tag on one of the rearend cover bolts indicating the ratio.if not remove cover count all the teeth on the ring gear and pinion,divide the ring gear # by the # of pinion teeth and that will be your ratio.