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Who knows universal joints? #2676403
07/10/19 08:57 PM
07/10/19 08:57 PM
Joined: Sep 2003
Posts: 2,690
Myrtle Beach, SC formerly the ...
340wedge Offline OP
master
340wedge  Offline OP
master

Joined: Sep 2003
Posts: 2,690
Myrtle Beach, SC formerly the ...
I am looking to replace the U-joints on my 1971 Plymouth Duster 340. It is a street car and I don't beat on it. I prefer Spicer brand but one parts site says 5-789X will fit, and says it doesn't. Does anyone know the Spicer part and should I go heavy duty or light duty that can be greased?
Thank you. green


1971 Sassy Grass Green Duster 340
2006 Charger Daytona GoMango
Re: Who knows universal joints? [Re: 340wedge] #2676413
07/10/19 09:48 PM
07/10/19 09:48 PM
Joined: Aug 2003
Posts: 33,120
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 33,120
Bend,OR USA
Buy the best U joint you can get now just in case you decide to get abusive with the car later devil whistling
As far as the U joint it is either a 7260 Detroit (inner keepers) or the larger 7290 Detroit type U joint.

Last edited by Cab_Burge; 07/10/19 09:50 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Who knows universal joints? [Re: 340wedge] #2676431
07/10/19 10:42 PM
07/10/19 10:42 PM
Joined: Nov 2003
Posts: 35,328
Lincoln Nebraska
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RapidRobert Offline
Circle Track
RapidRobert  Offline
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Posts: 35,328
Lincoln Nebraska
it'd either be the smaller 7260 which iirc is 2&1/8 from inside to inside on a pair of ears on the shaft or a 7290 which is 2&5/8" (I hope my dimentions are correct, measure yours) & likely that might account for the discrepency in the listings (showing 2 numbers). After installing on the bench confirm the yoke in front moves smoothly thru both planes of travel & the rear ujoint moves smoothly thru its single plane of travel (whack the 2 connector "ears" on each end of the shaft with a medium BFH as needed) & make sure the zerk is in compression. confirm no needle bearings fell down during the install. EDIT an eBay listing says it is a 7260 & 2&1/8" is correct & a 1.078" bearing cap O.D. MORE EDIT consider haveing the shaft balanced (or at least checked by a competent shop) that balances for HIGH RPM (some balance too low). You might talk to Doc

Last edited by RapidRobert; 07/10/19 11:28 PM.

live every 24 hour block of time like it's your last day on earth
Re: Who knows universal joints? [Re: 340wedge] #2676467
07/11/19 12:55 AM
07/11/19 12:55 AM
Joined: Sep 2003
Posts: 2,690
Myrtle Beach, SC formerly the ...
340wedge Offline OP
master
340wedge  Offline OP
master

Joined: Sep 2003
Posts: 2,690
Myrtle Beach, SC formerly the ...
Thank you both, lots of good information in there. I think the Spicer 5-798X looks like a winner. beer


1971 Sassy Grass Green Duster 340
2006 Charger Daytona GoMango

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