CLASS RACER FORUM - View Single Post

casrak7 · 09-13-2017, 07:18 PM

2,900 lb race weight. Quarter mile only. grudge race car. 408 LS based engine. Peak power of 729 at 7550, peak torque of 573@ 6200. 6500 converter, shift at 8000-8100, cross around 8200-8300. 4.56 gear, 28 or 29" tire.......whichever seems to cross where we need it to. Expect the car to go very low nines at around 144-145. If we were to run a powerglide trans, what would be your opinion of the ideal first gear on the glide? I know a 1.80 will recover from the gear change better, but would a 1.97 first gear be better for overall performance?

09-13-2017, 07:18 PM	#1
casrak7 Junior Member Join Date: Jul 2011 Posts: 63 Likes: 0 Liked 3 Times in 2 Posts	Advice on powerglide first gear 2,900 lb race weight. Quarter mile only. grudge race car. 408 LS based engine. Peak power of 729 at 7550, peak torque of 573@ 6200. 6500 converter, shift at 8000-8100, cross around 8200-8300. 4.56 gear, 28 or 29" tire.......whichever seems to cross where we need it to. Expect the car to go very low nines at around 144-145. If we were to run a powerglide trans, what would be your opinion of the ideal first gear on the glide? I know a 1.80 will recover from the gear change better, but would a 1.97 first gear be better for overall performance?