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Rear end universal joint.

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Old May 24, 2021 | 07:01 PM
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Rear end universal joint.

I'm contemplating a rear end swap to better match up the differential gear with my installed 5 speed manual transmission. My current differential is a Dana 44 with a 2.72 gear. I've got a 8.8 rear end out of 1988 f150 with a 3.55 gear where the spring and shock mounts match up but it seems the yokes are different. Would this be as simple as changing universal joints. Or would it require changing the driveshaft end or the yoke?

The universal joint bolts are the same width but the 8.8 are longer.



This is the 8.8 diff that is about 3.6”




This is the Dana 44 and about 3.25”




This is just a better pic of the Dana 44

 
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Old May 24, 2021 | 07:14 PM
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They make U-Joints for swaps like that, for mating components which take different U-Joints, but I don't know if there's one for your application.
 
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Old May 24, 2021 | 07:43 PM
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Something like this looks promising.

Yukon 1310 to 1330 adapter U/Joint. The 1310 side has a 3.219" span and 1.062" caps. The 1330 side has a 3.625" span and 1.062" caps. Both sides are outside snap ring.
 
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Old May 25, 2021 | 02:08 AM
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A driveline shop can convert you driveshaft to whatever you need. It's a good idea to have your drive shaft balanced if your not sure.
 
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Old May 25, 2021 | 10:36 AM
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Try a napa and bring both U joints with you, they can look up and get you a conversion U joint. Save the box it comes in for future reference.
 
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Old May 25, 2021 | 07:04 PM
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Yes there are Ujoints made to do just that, I used one on a car that I swapped in a WC T5 into.

FYI
The other thing you need to look at is the axle housings or really the pinion yokes.
Measure from the axle center line to the yoke where the Ujoint sits if they are the same distance as some have a longer or shorter pinion depth between them.
If this is more then 1" difference the drive shaft will need to be made longer or shorter to work with the new rear axle.
Dave ----
 
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