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PostPosted: Fri Jun 18, 2021 5:42 pm 
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EFI Slant 6
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Joined: Wed May 28, 2003 9:08 am
Posts: 295
Location: Austin, TX
Car Model: 71 Dodge D100 64 Plymouth Valiant Wagon
I did a search and couldn't find this info, so does anybody know what size U-joint I will need when using the old 7.25" driveshaft and a new 8.75" rear?
I understand that the size for each axis of the U-joint will be different.

Thanks,
Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT 3:23 rear
powered by Sweet Lady Propane
64 Valiant Wagon 225 904 AT


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PostPosted: Fri Jun 18, 2021 7:20 pm 
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Guru
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Joined: Sat Oct 12, 2002 11:22 am
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Location: Sonoma, Calif.
Car Model: Many Darts and a Dacuda
Chrysler basically used 2 different sized u-joints during the time SL6 engines were in production.
The "small" version, with inner "C" clips, found on the 7 1/4 is called a 7260 u-joint. The larger version is the 7290.

8 3/4 axles used both types so you will need to measure to find the size on your replacement 8 3/4.
There are special conversion u-joints made to fit small to large or visa-versa but truth is, your 7 1/4 driveshaft will be too long to mate to any 8 3/4 so change the drive shaft yoke to the needed size, when shortening it.
DD


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PostPosted: Sat Jun 19, 2021 4:55 am 
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Supercharged
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Joined: Sat Nov 27, 2004 8:03 pm
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Location: IRWIN PA
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Here is a handy chart containing info as doc had referenced:

https://www.dennysdriveshaft.com/c974_u ... _size.html


Greg

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PostPosted: Sat Jun 19, 2021 6:30 pm 
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EFI Slant 6
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Joined: Wed May 28, 2003 9:08 am
Posts: 295
Location: Austin, TX
Car Model: 71 Dodge D100 64 Plymouth Valiant Wagon
THANKS GUYS! I lucked out and have the same diameter U-joint on each axis.

Doc--you mentioned shortening. That is the next step. Is there a chart out there that shows driveshaft lengths?

Never mind--found it with a Google search.

Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT 3:23 rear
powered by Sweet Lady Propane
64 Valiant Wagon 225 904 AT


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