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which rear gear?

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wideopen231:
Ok with very few runs on gear in car it is showing that it was used gear when I put it in.  Not enough runs to decide if like the gear or not. Been running 4.11. More info.1.69 low gear 32 tall tire and chance of 33 in future. Figure I need to be 3.89 to 4.30 and that is why the 4.11 a mid-range start. Car has not been violent or stupid acting. Shake issue especially T-n-T track which normally sucks anyway.  The engine is 975 hp about 900 tq. car weight around 1750# on starting line. Should be adding 75 give or take a few . if new pistons  and rings ever get here. With cost of Pro Gear would like to guess dead on. 

So 3.89,4.11 or 4.30? Remembering 1.69 low.

tcoupekyle:
My car was similar setup 1.69 low 1100hp bbc at 1680lbs. Didn’t make a ton of runs with the setup but it seemed to like the 4:11 at the time I was running a 16x33 tire and it like to shake like crazy.
 The previous owner of the car tested and like a 3.89 but he was operating a blown sbc.

wideopen231:
Maybe wrong here.Very little fed tuning to go on. From guys, I have talked with Feds are not really happy with a lot of tire. Wheel speed is king when it comes to smooth runs. Frank Park's told me the M/T's will be a problem. Said he could not get enough wheel speed with his motor leaving at 9200  with them. Wondering where best to spend money on gear or tires. If go tires I might need smaller wheels for 33x 15x 12 M-H's.

Kyle going off blower car stuff, so take it for what it is worth. Shake normally come from too little tire speed. So how do you choose gear. Lower will hit tire harder but less wheel spd in rlation to engine rpm. Of coarse opposite true but require more power to get tire going. Got to love this stuff or just stupid to spend the money we do. LOL

wideopen231:
Sitting hear brain in gear(maybe) and butt not. Running numbers with a drive shaft spd of 140 rpm you will get 2 tire roations more with the 3.89 compared to 4.11. Ok it only r tire rpm  but figure in roll out and it is lot of distance if engine can pull it

wideopen231:
Well decision made for me. Had a guy offer up a 10 or 12 run gear cheap. So going to find out which one works better.

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