Differential gear question
Posting Guru
Joined: Oct 2010
Posts: 1,199
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From: Missouri
You can always go to Pick-N-Pull and see if they have any 1980-1986 Ford trucks to pull a third member from. It just needs to be 31 spline and it will bolt in. I picked up a 3.25 unit but never installed it.
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Joined: Jan 2001
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From: Virginia
If you have the tranny laying there, mark the input and output shafts and then count how many times the input shaft turns to get the output shaft to turn 1 turn. You can do a google search also. There is a thread on here now where someone posted some of the different trannies.
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Senior User
Joined: Nov 2012
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If you have the tranny laying there, mark the input and output shafts and then count how many times the input shaft turns to get the output shaft to turn 1 turn. You can do a google search also. There is a thread on here now where someone posted some of the different trannies.
must be looking up the wrong stuff
Lead Driver
Joined: Jul 2009
Posts: 6,477
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From: Sheffield, AL
The FORDification.com Forums • View topic - Transmission gearing and info! Save INFO!
Give credit to Ken Blythen for providing this link to me on another thread.
Give credit to Ken Blythen for providing this link to me on another thread.
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Senior User
Joined: Nov 2012
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The FORDification.com Forums • View topic - Transmission gearing and info! Save INFO!
Give credit to Ken Blythen for providing this link to me on another thread.
Give credit to Ken Blythen for providing this link to me on another thread.
guy we bought the truck from said they did work to the rearend or transmission for highway use.
Moderator
Joined: Jan 2001
Posts: 57,005
Likes: 2,750
From: Virginia
I doubt they modified the tranny. If they did anything they changed the rearend out. You can easily check that the same way. Turn BOTH tires at the same time, one turn, and see how many times the input shaft where the driveshaft hooks to turns.
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Senior User
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we have done checked the rear end.and its has the factory gears in. thats why we want to check the transmission or find a way to check the trany
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Lead Driver
Joined: Jul 2009
Posts: 6,477
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From: Sheffield, AL
Since you have confirmed the rear ratios, simply drive the vehicle with a tachometer hooked up. Record the RPMs at several different speeds in high gear and then, using one of the online gear calculators, see if the RPMs being turned match up with the correct speed [kind of backwards, but should work].
Make sure you correct for oversized tires, if applicable.
Make sure you correct for oversized tires, if applicable.
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