| fatso2114 | -- 08-31-2025 @ 5:14 PM |
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Hello I can’t find no markings on my rear differential is there another way to tell what ring and pinion I have without taking the differential apart thanks, John
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| ford38v8 | -- 08-31-2025 @ 6:03 PM |
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Several ways. 1 - Remove the fill plug an mark the ring with something visible through the hole. Rotate and count the teeth. or 2 - Jack up one rear wheel and put the tranny in 3rd gear. Remove all spark plugs and turn the wheel by hand, counting the revs of the engine for one complete rotation of the wheel. or 3 - jack up the rear and lay on the floor under the differential. Look up to rib on the front of the differential, where you'll see the hand stamped mark. Divide the large number by the small number and that's your ratio. Alan
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| fatso2114 | -- 09-01-2025 @ 3:19 AM |
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Alan thanks for the great information,John
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| 52flatv8 | -- 09-01-2025 @ 8:37 AM |
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You can also count revolutions of the rear to the driveshaft with the trans. in neutral.
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| carcrazy | -- 09-01-2025 @ 9:23 AM |
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Put the transmission in 3rd gear (1:1 ratio), mark the front pulley of the crankshaft and an adjacent place on the engine front cover, mark a spot on the rear tire where it touches the ground, have someone monitor and count the engine crankshaft rotations while you push the car until the mark on the rear tire touches the ground again. The tire will then have traveled one revolution. The axle ratio is the number of turns of the engine in high gear relative to the number of turns of the rear wheel. To reduce the effort required to manually push the car you can remove all of the spark plugs for this test.
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| fatso2114 | -- 09-04-2025 @ 2:43 AM |
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Thanks carcrazy for the info,John
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