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7260 with a 904 reliability? #2508073
06/13/18 06:45 PM
06/13/18 06:45 PM
Joined: Jul 2007
Posts: 363
San Diego
6
64dartsb Offline OP
enthusiast
64dartsb  Offline OP
enthusiast
6

Joined: Jul 2007
Posts: 363
San Diego
He guys so I’m rebuilding my car again and it about to be time to get a new druveshaft, the old one was too short.

I had 7260 u joint upfront by the transmission and a 7260-7290 conversion u joint in the rear.

I’m under the car taking a look at it wondering how this whole thing is going to hold up.

The car might make 450hp on it’s best day ever, and I’m holding it together with 50yr old bolts on the pinion.

I was thinking about buying new bolts and straps. I wanted to convert it all over to something stronger but I’m not really sure what to do. Any ideas or suggestions could help.... thanks dudes


if your dreaming of your car then it's your dream car....
Re: 7260 with a 904 reliability? [Re: 64dartsb] #2508111
06/13/18 08:16 PM
06/13/18 08:16 PM
Joined: Jul 2004
Posts: 3,028
Arlington, Texas
B
bobby66 Offline
master
bobby66  Offline
master
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Joined: Jul 2004
Posts: 3,028
Arlington, Texas
The hardware won't hurt, but the load is carried by the yoke itself. The straps just hold the u-joint in.


B
Re: 7260 with a 904 reliability? [Re: 64dartsb] #2508125
06/13/18 09:14 PM
06/13/18 09:14 PM
Joined: Aug 2003
Posts: 32,296
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: 32,296
Bend,OR USA
All the Max Wedge cars and possibly some of the 1964 and 1965 race Hemi B body cars came stock with 7260 U joints work
As far as replacing the bolts make sure they are grade 8 and not to long up scope The straps are different between the 7260 and 7290 U joints also,don't try mixing them tsk Maybe replacing the front U joint with a Neapco H.D. solid truck U joint (no grease fitting in it up) will help make it live longer under abuse on the street also up scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 7260 with a 904 reliability? [Re: 64dartsb] #2508129
06/13/18 09:22 PM
06/13/18 09:22 PM
Joined: Aug 2005
Posts: 11,384
chicagoland,usa
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buildanother Offline
I Live Here
buildanother  Offline
I Live Here
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Joined: Aug 2005
Posts: 11,384
chicagoland,usa
Had a few 7260 joints that took a pounding here too. The main thing is to look close at the flange itself, new straps or not, that once the straps are tight against flange, that the joint cap is held tight. If flange has some big wear, the joint caps can be spinning around over time.

Re: 7260 with a 904 reliability? [Re: 64dartsb] #2509839
06/18/18 03:29 AM
06/18/18 03:29 AM
Joined: Jan 2009
Posts: 52
southeast NE
L
lemondana Offline
member
lemondana  Offline
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Joined: Jan 2009
Posts: 52
southeast NE
Mopar Performance used to have a 904 slip yoke with the 7290 U joint. I believe they also came in some Dakotas that had the 904. I'll look and see what the part number is and post it on here.

Re: 7260 with a 904 reliability? [Re: 64dartsb] #2509907
06/18/18 11:34 AM
06/18/18 11:34 AM
Joined: Jan 2004
Posts: 4,538
fredericksburg,va
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cudaman1969 Offline
master
cudaman1969  Offline
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Joined: Jan 2004
Posts: 4,538
fredericksburg,va
I'll be useing those joints in my F Stock Duster, in fact the shaft is CM and came out of an G Stock that carried the wheels two ft. He had the conversion joint in the back but I'll use the Dana 7260 yoke with solid joints and not worry too much. The axle people offer CM yokes that take the big racing yoke everyone uses today, can't remember the # off hand, overkill for your app imo. All A-Bodys after 70 came with the small joint, even 3-4 speeds if I remember right.

Re: 7260 with a 904 reliability? [Re: 64dartsb] #2510230
06/19/18 12:05 AM
06/19/18 12:05 AM
Joined: Jan 2003
Posts: 18,558
Park Forest, IL
slantzilla Offline
I Live Here
slantzilla  Offline
I Live Here

Joined: Jan 2003
Posts: 18,558
Park Forest, IL
My Valiant has 7260 u-joints in it and went 10.0@129 with a transbrake. Mike even had an aluminum shaft made with 7260s in it. Most of the time a broken u-joint is caused by improper pinion angle, not horsepower.


"Everybody funny, now you funny too."
Re: 7260 with a 904 reliability? [Re: 64dartsb] #2510378
06/19/18 01:50 PM
06/19/18 01:50 PM
Joined: Jan 2003
Posts: 5,613
Florida
Locomotion Offline
master
Locomotion  Offline
master

Joined: Jan 2003
Posts: 5,613
Florida
I've been using an aftermarket mild steel driveshaft tube (.083"?) with Spicer 7260 solid joints for many years of trouble-free racing. Best of 1.47 60' with normally about 1' wheelstands at 3,540+ lbs. I also use steel billet rear end yokes with u-bolts. OEM style can spread over time. OEM slip yoke.


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