Jtm2085

iTrader: (1)

Hey guys I am trying to figure out what the best gear for my car would be. I'm running a th400 with a 9.5in converter that's stalls around 4300 on motor, h/c/I 346 spraying a 150 shot. Currently I have 26in tires and 4.11's. I plan to swap to a 28in soon. The car traps 107 in the 1/8 and doesn't run out of gear until 125 or so. I have read about how nitrous likes to be "grunted" but don't have any experience with it. Would I benefit from swapping to a 3.70 or similar gear? It would be nice to be able to take it through the full 1/4 as well.

allblackedout5

iTrader: (18)

My opinion from experience would be to run a 28" tall tire and 3.73 gear or something equivalent. Where are you shifting and what is your rev limiter set to be?

Jtm2085

iTrader: (1)

Shifting around 6800 and limiter is set at 7000. It would be much more pleasant on the highway with the 3.73's lol

Doug G

3.73's to 4.11's is only about 300rpm @ 65ish

Jtm2085

iTrader: (1)

True. Every little bit helps when your riding down the road with dumped duals lol

Doug G

Oh, I agree, been there and done that....thinking maybe 3.50's if you plan to keep the 26's

Jtm2085

iTrader: (1)

I'm going go step up to a 28in here shortly. I would rather have the on track performance vs street manners. Noise reduction is just a plus lol

HCI2000SS

iTrader: (2)

Will be interesting to see if you have enough gear on the 150 shot with a 28" tire

Nostang

iTrader: (4)

You will be about almost perfect with a 28" on your current setup assuming ~5% converter slippage and 135mph traps. Anymore spray and you will want to go with 3.70's.

NHRAFORMULA00

iTrader: (2)

Leave the 4.10 gears . my car runs 133-134 mph and i go thru at 6,900 -7,000 rpm with 28 tall slicks. Make sure you have 1 inch clearance or they will rub at that mph

Jtm2085

iTrader: (1)

Thanks for all the advice guys! I have a set of used 275/60/15 pro bracket radials that I am going to throw on and try. I think it will be close.