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EFV-8 Club Forum / General Ford Discussion / Rear end ratio?

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Discussion Topic: Rear end ratio? -- page: 1 2

ibshane

01-29-2018 @ 7:12 PM

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How do you deturmine the rear end gear ratio when you have a closed torque tube driveline??

carcrazy

01-29-2018 @ 7:52 PM

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You can determine the rear axle ratio by doing the following:
Remove all the spark plugs to make the engine easier to turn over
Mark the engine crankshaft pulley and a stationary part on the front of the engine with lines that line up
Place a mark on one of the rear tires that points to the ground (BDC)
Place the transmission in high gear
With the car on level ground roll the car one revolution of the tire you have marked
Have a helper look at the crankshaft pulley to count the number of turns it makes for one tire revolution
This number will be your rear axle ratio

woodiewagon46

01-30-2018 @ 7:31 AM

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The ratio should be stamped on the bottom of the housing. If I remember correctly it's located near the flange where the torque tube bolts to the rear end.

ibshane

01-31-2018 @ 2:40 PM

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This is the only numbers I could see stamped into the diff. housing.
Looks more like it would be a date?

9
-
3
4

2

40cpe

01-31-2018 @ 6:17 PM

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34/9=3.7777 (3.78)
I don't know what the 2 is.

ibshane

01-31-2018 @ 9:02 PM

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Why wouldn't they just stamp 3:78?

ford38v8

01-31-2018 @ 11:55 PM

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C'me on, Shane, don't you remember your father's answer: "To make little boys ask questions." Sheesh.

Alan

FrankM-RG5

02-02-2018 @ 7:20 AM

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They just stamp the number of teeth on each gear. The earlier answer about turning the engine is more correct because over the years who knows what went into these.

ibshane

02-02-2018 @ 7:31 AM

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I agree.
Mine seems shorter than 3.78 when driving it.

This message was edited by ibshane on 2-2-18 @ 7:34 AM

woodiewagon46

02-02-2018 @ 7:55 AM

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Frank, brings up a good point. Perhaps the rear end was rebuilt at some time and the stamped "two" is a mark of who the mechanic was that worked on the rear.

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