Brand New 7290 U-Joint Failure
Anyone have any thoughts on what happened and who is good in the drive shaft business. Never had this happen before.
Check for adequate pinion angle.
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I bet you have a CF-II set-up.
Mine killed a 7260 right quick on the street, with 275/60-15 BFGstreet tires.
Very early on, I swapped out the CF-II disc for a stock 340 disc. They don't last very long, but they also don't break stuff. And I don't do 4000rpm drops any more.And I reduced the clamping force by shimming the PP away from the flywheel.
Eventually I installed 1350 at the front and a hybrid 1350/7290 at the rear.
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As you may know, the CF-II has flyweights that increase the clamping with rpm. So I launch below 3000, then floor it. That gives the clutch a lil slip on take-off but as soon as the Rs go over ~3000, the PP bites and the tires loose grip (295s now, sometimes 325/50-15 BFG-DRs).. This is much more satisfactory on the street.
To take off normally;
I blip the throttle just a lil, then, more or less just dump it and go, letting the heavy stock 340 rebalanced FW, do the work.
My starter gear is 3.55 x 3.09=10.97,
which would be same as 4.10 x2.66=10.91
My 60fts,with street suspension,and this clutch set-up, the only time I ever went to the track, were greater than 2.2
The shims I used were just hardened washers. I cannot recall anymore how thick they were, I'll guess
maybe .060. Maybe less.
The 340 discs usually fail by spitting out springs, but occasionally by throwing off the linings. When I drive half-decent , I can get several summers out of them. But it only takes a few full-clamp drops to spit springs.
By it's ET of 93 in the Eighth, at 3457 pounds, this lil 367 is making 433hp; by the Wallace Calculator. Track is at 900ft. Powershifted at up to 7200
