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I'm really concerned about traction even with semis although a bit hard she looses traction in 3rd gear on high boost, is this common with 400 plus Gtr ?

No that is not normal... What tyres, what width and what suspension do you have?

Without much information my guess would be you have a dead transfer case if you are losing traction in 3rd

sime1, It use to do 132 mph at 380 killerwasps on 98. best I got was 11.080, The box in it now has standard ratios and the diff is 411.

When are you shifting, I would have a look at your torque curve and base your shifts around that, I found my best mph came from shifting at 7200 if I recall correctly, I cannot exactly recall but the iShift was set so that when I changed gears it would have the rev drop right if the fat zone of the torque curve..

Also what are your 60' times like, I think my best was 1.7.

I am eagerly awaiting some good results, they shouldn't be far away, you just need to sort out the basics and it should give you the results you are looking for.

Plus with a good box the reliability issue of the std box at that power and grip level should be sorted.

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