3.73s or 4.10s for H/C A4
#1
3.73s or 4.10s for H/C A4
I need some good advice on what type of gears would be best suited for my setup. The car is a H/C LS2 shortblock. My current goal is to get the car into the 10s N/A and then hit it with a 150 shot. I'm running an SS4000 converter and built 60E and currently building a 8.8 rear for it. I bought 3.73s thinking it would be a decent increase from the 3.23s but I also want to step up to a 28" tire for when I start spraying the car. Will the tall tire kill my gearing a lot on motor? I trapped 121mph last year and was hoping to gain a few extra to hit 10s. The car does see a lot of street duty as well. Will stepping up to 4.10s make it a pain to daily if I choose to do so? I think either gear will give me enough mph to work with on the spray but I want good n/a performance as well. My other option is keep the 3.73s and run a 26" radial on motor and the 28" on spray. What do you guys think?
#2
LS1Tech Co-Founder
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Shifting at 7k, was going 134mph with 4.10's, 28's and 4800 stall and 150 shot. I believe I could have gone 137mph based on other folk's results I've read about. Car at the time was going 123mph NA and needed a bit more converter or gear as I was running a big cam in a 348 ci.
I believe tuff went 14x mph with 4.10's and 28's, maybe 143? I have no idea what rpms he was buzzing.
I believe tuff went 14x mph with 4.10's and 28's, maybe 143? I have no idea what rpms he was buzzing.
#3
gear calculator says it'll go 142 with 4.10s and 28" tire @ 7K but that doesn't account for converter slip. I don't think I'll need to much mph but the car currently weighs 3700lbs and will eventually be going on a diet. Cam is nothing real big so I can deal with a tighter converter as well.
Is it gonna suck driving around on street tires (probably 26") with the 4.10s?
Is it gonna suck driving around on street tires (probably 26") with the 4.10s?
#5
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with the 4l60 will they not shift into 4th in the 1/4? going by the rpm gear, and tire it looks like they are only using 3rd. not trying to hijack just trying to understand because I am also changing gear and have to pick between 390 and 411's