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You answered your own question before, if you go 3.45's, which i have in my senator(manual 6 speed) you will only wish you had gone 3.7's, it will liven it up and you have 4 gears anyway. I need to swap to 3.9.
Do you know what ratios your box has, compared to the T56 from a late model LS1, apparently the LS1 box has really short gears. Or is that all 6 speeds (LS1 and Holden strokers)?
They have different ratios, but they are both fairly short. I was hitting 4th by the end of the 1/8 and that was at only 80mph. so I think the VR/VS 6spd has closer ratios. I could be wrong though. In 6th at 90km it sits happy at 1500rpm
I figured they were different, i was hoping someone had the actual numbers for each gear so i can compare it to the box i have, and to the old T5...
Thats the ratios i have for the LS1 box, but is the VR and VS HSV 6 speed the same ratios?