92 RSS

My power range is from 3000 to 6500rpm, T-5 tranny and I'd be using a 26" tire and possibly going up to 28". Or should I stick w/3.73 for now?

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92 RS, 350, Street & Performance MPFI, TFS heads,
Crane Rollers,
MSD Digital 6 Plus, 22lb injectors,
ZZ3 cam, Edelbrock Headers 1 5/8, 3" Exhaust,
Hi Flow 3" Cat, stock T-5,
stock rear 3.08, koni yellow adjustable front, twin turbo glass hood, T-tops, Auto Meter Ultra Lite Series 2 5/8 gauges, Teal Green

AlkyIROC

Stick with the 3.73 for now. If you're crossing the finish line way below your red line then go to 4.10.

If you go to 28" tires then you'll probably have to go to 4.10 or maybe even 4.56

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

20-psi

What you want to is at the end of 4th gear and at the end of the power band. My mustang has 410's with 26 in tires and still have a little more left in it. I am getting 430's soon and this should be okay for me. With 28 in tires, 410's should be ok because I had this setup and it was the right gear. I ran a 10.97 at 123 on that pass.

Pete

BadBowtie88

I would stick with the 3.73's. My friend has a 5.0 with 4.10's, and they are just too much for street tires. If you have slicks or drag radials, maybe 4.10's, but, if only street tires I would go with the 3.73's.

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1988 Iroc-Z
L98 350 TPI
700R4 Tranny
2.77 gears(will change)
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Mods: Crane CompuCam, headers, gutted air boxes
Best e.t.: 14.49@95.5mph
60ft.@2.27(was 2.12 w/o cam)