Posted By: mopowers
7260 Joint limits... - 12/14/12 08:45 PM
How fast have you guys gone with 7260 u-joint pinion yoke with straps???
7260 Joint limits...
Posted By: Crizila
Re: 7260 Joint limits... - 12/14/12 08:52 PM
Quote:I've gone 11.53 without a problem, but I was running an automatic car. I have since upgraded to 1350 joints on both ends as I approach running in the 10's ( probably overkill in my case ). I would seriously consider dumping the 7260's if I was running a stick car if it was a 10 second car.
How fast have you guys gone with 7260 u-joint pinion yoke with straps???
Posted By: Guitar Jones
Re: 7260 Joint limits... - 12/14/12 08:55 PM
Broke one in my 12 second Duster when it was a stick car. Since then I've gone 9.70's with a solid small joint in the front yoke with an automatic, trans brake at 2700 pounds.
Posted By: sshemi
Re: 7260 Joint limits... - 12/14/12 08:56 PM
6.9 and 104 mph in the 1/8 with tbrake with 3540lb.
Stock straps
Stock straps
Posted By: DragDart360
Re: 7260 Joint limits... - 12/14/12 09:02 PM
9.95 133 2800 lbs 1.39 60 ft
Posted By: moparacer
Re: 7260 Joint limits... - 12/14/12 09:18 PM
Have 7260 joints in my old Duster. Leaves hard with 1.40 60 fts. Just Built my low 11 second Barracuda and used them in it too.
Any quicker then that I would go with the 7290's
Any quicker then that I would go with the 7290's
Posted By: Cab_Burge
Re: 7260 Joint limits... - 12/14/12 10:59 PM
My Duster and my old M.W. stocker had them 
My Duster went 10.34 at 128.6 MPH weighing 3450 lbs with a 1.43 60 ft. times 
they would still be in the car if the 8 3/4 non braced rear end housing hadn't bent up bad enough to tear the ladder bar brackets of the housing 
The straps stop the for and aft movement, there not intended or designed to bear any of the side loading from the U joint cup, the straps are designed to keep U joint cup in the pinion yoke and prevent any forward or rearward movement of the U joint cups in the pinion yoke 
As long as you use a good, solid trunion shaft H.D. 7260 joint and a good pinion yoke you should be good 
BTW, there are two different sets of straps, one for thee 7260 and a different set for the 7290 Don't mix them 
My Duster went 10.34 at 128.6 MPH weighing 3450 lbs with a 1.43 60 ft. times they would still be in the car if the 8 3/4 non braced rear end housing hadn't bent up bad enough to tear the ladder bar brackets of the housing The straps stop the for and aft movement, there not intended or designed to bear any of the side loading from the U joint cup, the straps are designed to keep U joint cup in the pinion yoke and prevent any forward or rearward movement of the U joint cups in the pinion yoke As long as you use a good, solid trunion shaft H.D. 7260 joint and a good pinion yoke you should be good BTW, there are two different sets of straps, one for thee 7260 and a different set for the 7290 Don't mix them
Posted By: Locomotion
Re: 7260 Joint limits... - 12/15/12 12:24 AM
11-teens, 1.47 60' best and weighing about 3,550 lbs.
As far as I'm concerned, solid u-joints are the only way to go. Currently I have solid Spicer 7260 u-joints, but there are a couple of other maufacturers who make solid versions also.
OEM yokes and straps are another matter. I have had OEM yokes spread over time which will pound the caps and sling the driveshaft out! Best insurance there is a billet steel yoke, which comes with u-bolts, and is available from Mancini and probably a couple of other sources.
As far as I'm concerned, solid u-joints are the only way to go. Currently I have solid Spicer 7260 u-joints, but there are a couple of other maufacturers who make solid versions also.
OEM yokes and straps are another matter. I have had OEM yokes spread over time which will pound the caps and sling the driveshaft out! Best insurance there is a billet steel yoke, which comes with u-bolts, and is available from Mancini and probably a couple of other sources.
Posted By: slantzilla
Re: 7260 Joint limits... - 12/15/12 12:59 AM
My buddy Mike went 10.0@129 with them in his Valiant. 904/brake/2700#.
Posted By: CHAPPER
Re: 7260 Joint limits... - 12/15/12 01:49 AM
6.43 @ 107 my best in 1/8. 10.40 @ 130 my best in 1/4,,I've only made about 4 1/4 passes.
Posted By: Crizila
Re: 7260 Joint limits... - 12/15/12 05:17 PM
Quote:It's more than just the u-joint size that's involved. You have to look at the driveshaft size ( diameter ) also. Often you have to go to a 3.5" dia shaft to stay out of the critical speed zone, and that warrants bigger u-joints so the yokes match up to the shaft properly. If I have to go to a 3.5" shaft ( or larger ), I sure would'nt want to neck it down at the yokes to accommodate smaller u-joints. I must say, it seems there were a lot more u-joint failures in the 60's than there is today, so somethin had to get better.
My buddy Mike went [Email]10.0@129[/Email] with them in his Valiant. 904/brake/2700#.
Posted By: MR_P_BODY
Re: 7260 Joint limits... - 12/15/12 06:40 PM
Quote:
How fast have you guys gone with 7260 u-joint pinion yoke with straps???
I still have the 7260... been 8.90s so far but in
a light car.. if you have a heavy car it could break
if it has good traction.... just like the 8 3/4 if
the car is light you wont have any problems... and yes
I still use the straps... if you look at the design
of the joint you will see that it slips into the yoke
OVER half the diameter so the load is applied to the
yoke and not the straps... the strap just keeps it
from sliding forward
