differential codes for 81 truck

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Mar 23, 2005 | 11:40 AM

#16

loudfords

FTE Chapter Leader

Joined: Sep 2000

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From: Beachville, Ontario

Quote:

Originally Posted by Mr. Finch

So woud't it be that you spin the tire, and count how many time that the driveshaft spins.

Yes! Spin the tire twice (because of open differential) and count how many times the driveshaft rotates, that will be your ratio. Hope this helps.

Mar 23, 2005 | 04:47 PM

#17

Txquadhunter24

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Joined: Jan 2003

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02 is 3:00 open diff. have the same in my 86 F150.

Mar 23, 2005 | 04:55 PM

#18

andym

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Joined: Mar 2002

Posts: 19,402

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From: Bonita Springs FL

Quote:

Originally Posted by Mr. Finch

So woud't it be that you spin the tire, and count how many time that the driveshaft spins.

Yes, I did it backwards. Sorry!

Quote:

Originally Posted by Mr. Finch

But then my question is, would the amount of revolutions the driveshaft make be the ratio, or would you divide or multiply by 2 in order to compansate for only the one wheel spinning?

You still have to divide by two because of the open diff. That part I managed to get right.

Mar 23, 2005 | 08:45 PM

#19

Mr. Finch

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Quote:

Originally Posted by loudfords

Yes! Spin the tire twice (because of open differential) and count how many times the driveshaft rotates, that will be your ratio. Hope this helps.

So you spin the tire twice, and then divide by 2?
Sorry for all the questions, it is just that I am getting conflicting reports, and for future use, I would like to know exactly what I am doing.

Mar 24, 2005 | 12:18 PM

#20

loudfords

FTE Chapter Leader

Joined: Sep 2000

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From: Beachville, Ontario

Two ways: Spin tire twice, no. of driveshaft turns is your rear axle ratio, OR spin tire once, multiply number of driveshaft turns by 2 for your rear axle ratio.