Chris, I think there are others around that have done a 3.6 conversion and had tranny issues. YOu should do a search on Pelican or Rennlist for some discussions.
one of the problems with the 7.3:1 is that it is not as strong as the 8.3:1. I am not sure it will hold up for repeated abuse of a 3.6 on the track. It will have blinding acceleration at low speeds and less top end as you have already found out.
I would suggest just getting a new transmission with a new RP size. It will be cheaper and easier than setting up your current box with a tall 5th. It will also last longer. You may want to also consider a cooler setup on the box to help reduce the stress loads. You are really headed down a slippery slope.
Is your tranny electric or mechanical speedo? I have a 915 box in my ST. I think the lower gears would work fine with the 3.0. It does not have the low end torque of your 3.6 and feels a bit over geared sometimes. Too bad there is no LSD or we could swap.
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Jamie
71 911t SWT - stock and original
71 911 ST replica - HMM, Not so stock and definitely not original.
75 914 soon-to-be-WRX-Powered- GRM $2010 Challenge car.
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