Quote:
Originally Posted by Richard Hudgins
Indeed I had. I did not know that you had that type of half-shaft.
However, just a quick thought relative to your half-shafts.
We used to have a very similar problem with the splined shafts in the old FA (F5000) cars when Goodyear came out with the 15 inch slick. The loads on the splines were such that they would lock up (Not slide/change lenght) under acceleration and produce a very severe vibration. There were many tries at fixing this, including ball bearings in the splines to allow sliding under the loads. (The real problem was that the splines were not very good and too soft as well and would bind after a little wear.)
The fix was first Metalastic joints and then CV joints.
Maybe you have a similar condition and the splines are worn.
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That very well could be an issue, I was going to put Kirkhams conversion using Porsche 930 joints in, but my days of running this car are coming to an end so I did not convert it. The geometry is such that they move a small distance but that could still happen. Interestingly a F5000 car that ran in the 60's used Cobra half shafts and joints, I think the driver was Ron Grable and the car was built in the bay area. He liked the design of the English Hardy Spicer joints because they had extra space in the needle bearing cup.
They looked like there was a missing bearing only there was not enough space for another needle. I guess the thought was reduced friction at high loads , I never did find out why they made them like that. I had a 1972 March that used the metalastic joints on the Hewland FT-200, it had the larger Formula 2 joints but I still tore them up on a regular basis, they worked but were a weak point in the car.