Speedometer cable question.
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Tuned
Joined: Jan 2022
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Speedometer cable question.
Hello all my son has a 86 f250 6.9 diesel extended cab 4 speed, he installed a 5 speed transmission from a 92 f250 7.3 diesel. transmission works great but only problem is how to hookup speedometer cable or is it possible?
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
1992 and up trucks use an electronic speedometer/odometer, there is no drive gear on the output shaft.
No easy way around this one that I know of short of disassembling the new transmission to swap output shaft and tail piece with an older 5 speed trans.
No easy way around this one that I know of short of disassembling the new transmission to swap output shaft and tail piece with an older 5 speed trans.
Lead Driver
Joined: Nov 2002
Posts: 9,555
Likes: 40
From: Concord, NC
Assuming it was original to the '92, the rear case housing part number was the same between electronic and mechanical speedometers. It may even have a speedometer gear in it already, with the cable socket plugged. The first 7.3 transmission to show a spacer instead of a gear was in '94.5 with what I assume is the first powerstroke. I attached some PDFs that show what I'm talking about.
Tuned
Joined: May 2019
Posts: 480
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From: NJ
Is this a RWD or 4WD trans? If 4WD the cable connects to the transfer case. If RWD there is usually a blanked off hole in the tailshaft housing. No idea if there's a actually a gear inside the hole, but it's easy enough to check if you find the hole.
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Tuned
Joined: Jan 2022
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Yep we found the hole but like you wrote but it's blocked off inside. How would find out if there's a gear inside?
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
You would have to remove the output yoke to find out. If you do that, be sure to torque the nut to spec when reinstalling. Does it look like it's a removable plug or is the aluminum just not drilled through? There's a note in the ZF documentation to use plug number F2UZ-7H183-A on 4x2 with electronic speedometer.
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