School me on u-joint size
#577096
01/09/10 12:34 AM
01/09/10 12:34 AM
|
Joined: Sep 2004
Posts: 1,226 Cookeville
Chilort
OP
Will Work For Mopars
|
OP
Will Work For Mopars
Joined: Sep 2004
Posts: 1,226
Cookeville
|
I ran over to AutoZone and picked up the u-joints that are supposed to be for my truck. They are too small. But in checking to make sure I had the right joint (and realizing the ones I got were too small) I also noticed that my u-joints, at least for the joint where the axle attaches to the yoke on the diff is not the same size in both directions. In the picture below, the top to bottom dimension is not the same (is smaller) than the side to side dimension. In this second picture I'm holding up the u-joint I bought for comparison. It is a little difficult to see. Is the larger u-joint (the one with 1.126" caps and 2 5/8 yoke diameter) built "square" (like the new one I'm holding) or "oblong" (like the one that's on the axle)? Do I have some kind of conversion u-joint currently installed or is this just how it is supposed to be. Thanks in advance for the edumacation.
|
|
|
Re: School me on u-joint size
[Re: Chilort]
#577097
01/09/10 02:34 AM
01/09/10 02:34 AM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
Quote:
Do I have some kind of conversion u-joint currently installed
yes. inside from ear to ear on the drive shaft is 2&1/8" (7260) and inside from ear to ear on the yoke is 2&5/8" (7290). Get a conversion joint & your good. See the other thread on the adv's of a solid (no zerk) ujoint if this is a perf app. If so & you do use a no zerk ujoint grease it w the best long lasting grease you can find & somewhere down the line open it up & regrease it
Last edited by RapidRobert; 01/09/10 03:04 AM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: School me on u-joint size
[Re: justinp61]
#577099
01/09/10 10:02 AM
01/09/10 10:02 AM
|
Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
3 u-joint size 7260=2 1/8 7290=2 5/8 1330=3 5/8 with a 1" or larger cap IIRC I run a 7260/1330 conversion napa part # 240-0457 or its the other one that was mentioned already
Last edited by scratchnfotraction; 01/09/10 10:14 AM.
|
|
|
Re: School me on u-joint size
[Re: Lee446]
#577101
01/09/10 11:28 AM
01/09/10 11:28 AM
|
Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
7290/1330 conversion I give my buddy at napa a call and get it though,would be handy info to have any ways I know they found the 7260/1330 under a ferd/chrysler conversion IIRC the 1330 has no clips on the cups.straps and tabs on the yoke only
Last edited by scratchnfotraction; 01/09/10 11:36 AM.
|
|
|
Re: School me on u-joint size
[Re: scratchnfotraction]
#577102
01/09/10 11:41 AM
01/09/10 11:41 AM
|
Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
ok checked my buddy at napa...napa has changed #s and now use a 3 didget # 7260/7290= napa#347 7260/1330=napa#457 7290/1330= napa#458 hope that helps
|
|
|
Re: School me on u-joint size
[Re: Lee446]
#577103
01/09/10 11:42 AM
01/09/10 11:42 AM
|
Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
|
master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
|
Quote:
Hey Scratchn, what is the NAPA # for a 7290/1330 conversion? Thanks, Lee.
The cross is the same between the two. Only the caps are different. If you already have one or the other joint, you can just get the other size cap. At least on the ones I have.
|
|
|
Re: School me on u-joint size
[Re: Chilort]
#577107
01/13/10 10:11 PM
01/13/10 10:11 PM
|
Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
looks like a cap was spinning in the yoke from what I can see in the pic... is that what was up with it? maybe the time to get another shaft and build a good one with less conversion in it so the slip yoke in the 727 is a 7260 and the end of shaft is the oddball yoke?? what # on the chunk??741,742.489?? seems I have to build a shaft every time I swap a tranz on rear axle got a dozen spares in the shed various lengths and size yokes just for that kinda thing welcome to old mopars
|
|
|
Re: School me on u-joint size
[Re: scratchnfotraction]
#577108
01/13/10 11:19 PM
01/13/10 11:19 PM
|
Joined: Sep 2004
Posts: 1,226 Cookeville
Chilort
OP
Will Work For Mopars
|
OP
Will Work For Mopars
Joined: Sep 2004
Posts: 1,226
Cookeville
|
Best we can tell, a u-joint failed in the past. Rather than fix the shaft, the last person to put u-joints in just shoved one in. It was likely okay based on the surface area the cap could contact but why risk it?
So, the slip yoke is 7260. The shaft is now 1310 on the trans yoke end so I have a 7260 to 1310 u-joint. The other end is 7260 but the yoke on the 489 case diff is 7290 so I have a 7260 to 7290 u-joint there. The diameter of the drive shaft was 3.5 or 3.25.... can't remember. Either way, they could get one of those two diameter ends with the 7260 and I had the other.
Regardless, hot tanked, repaired, painted, new u-joints, and balanced for a buck fifty. Not bad in Atlanta I'd guess.
|
|
|
|
|