I'm thinking about having my engine bored and stroked this winter to breath a little life into it, and if so, I'm looking at roughly 450hp/450tq. I'm fairly certain my 4 spd Saginaw is not going to be happy with that power. And while I'd love to upgrade to a TKO 500/600 or even a T56, it's probably not in the cards if I don't want to cut corners on the engine build. This is going into a street car than I like to beat the snot out of, it will likely never see a drag strip, although an occasional auto-x is not out of the question.
I have no idea what the current Saginaw has for gearing, but first gear feels like a granny gear to me, and I need something different.
1) What is an ideal final drive ratio for my first gear? I have a 12 bolt posi with 3.31's, and a 26.7" tire.
2) Is there any way to tell what gears my current Saginaw has without pulling it out?
3) If I leave the Saginaw in there and just drive it hard till it dies, do I risk doing damage to any other components?
4) Will an M20 (2.52, 1.88, 1.46, 1.00) work well with my current 3.31's? I think the M21 (2.20, 1.64, 1.28, 1.00) would be better suited to a higher rear end gear?
5) If I could swing the extra dough, would I be better off with a TKO500 (3.27, 1.98, 1.34, 1.00, .68) or with a TKO 600 (2.87, 1.89, 1.28, 1.00, .82 or .64)?
Thanks for any insight.