Which yoke??

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mopowers

mopowers

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I'm going to the pick-n-pull yard tomorrow to find a trans. yoke for my 727 big block 66 dart build. I'm trying to find the bigger u-joint. How do I tell if the yoke is the bigger one or not? What measurement do I need. They only made two right? 7260 and 7290? Will the 729 be sufficiant in a high 10 second street/stripper? Do all 727's have the larger u-joint? What about pick-ups? Do all 727's have the same spline count?
 
Were the u-joint goes is 2 1/8" wide for the 7260 and 2 5/8" wide for the 7290. The 7290 will be sufficent for a high 10 car, I am running a 7260 rear joint on my low 11 car (as long as it is an auto not a stick). Not all 727 have the large joint. I have more small joint yokes than large. I have a 1974 D200, 1974 B200 and a 1988 B350 and all have the small joint. The D200 and the B350 have Danas and still have the small joint. I have two spares that are 7260 that also came out of pickups. The only large yoke that I have presently came out of a 1969 C-body. I have found that the bigger cars is were the 7290 joint drivelines are. At least with my parting of cars and bone yard hunting. I have only run across one 727 spline count as far as slip yokes are concerned.

Also the 7260 has a cap diameter of 1.078 and the 7290 has a cap diameter of 1.125, so you could keep a 7260 cap in your pocket when you go bone yarding and if the cap is smaller than the yoke you have a 7290.
 
Great, thats good info. Is there an easy way of measuring without taking the driveshaft out? You think a 74 newport bigblock would have the big joints?
 
If I'm running a high ten car, I ain't using stock yokes dude! Especially at the trany, and certainly the rear end too. They might last, but if they don't, you just wasted all the money that a quality set up would cost. Do this right,a driveshaft spinning wildly is no fun, just ask my right leg.
Even with hoops, you still will damage a yoke or two, and a driveshaft$$$$$$$
 
I have a 904 and I found a 7290 yoke for it at the driveline shop that built my driveline. They also had a billet 1330 yoke for my 8-3/4 rear. So I have 2 different joints in the shaft, but they should be easy to find when I have to replace them.
 
I have (2) yokes, both fit 727 or A833 Overdrive Four, one has large u-joint, one has small, the larger joint was behind an auto in a 73 Satellite 400 ci, the small joint was behind both my 4 speed and overdrive four in my 74 Satellite. So I would think they can be found either way. Factory stuff was plenty strong in my opinion, I have certainly done my fair share of abusing them and have only ever had one fail (that was exciting though). The cap is 1.078 on the small and the large is 1.125. Easy to identify with a dial caliper.

Little note I caught on another web page somewhere:
What is the difference between the Chrysler 7260 and 7290 series?
The 7260 and 7290 series are the two sizes that are commonly found on Chrysler products. They represent the two stock sizes that have been used for many years. The 7260 series is the “small” Chrysler u-joint size and the 7290 series is the “big” Chrysler u-joint size. The 7260 series is similar in size to the 1310 series and the 7290 is similar in size to the 1330 series. They both utilize the inside “C” clip design to hold the u-joint within the yoke whereas the 1310 and 1330 use the outside snap ring design.
 
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