I have a TH-350 transmission. I want to put 430 gears in the rear, but first I want to know what my top speed would be and if these gears are a pain in the ass to drive with?

Well, a t350 has 2.52, 1.52, 1 for gear ratios. And it depends on what your deffinition of Drivable is. I have 3.55 gears but a short tire at 265/50/15 so that is as deep as i would like to go. I drive my car daily and on the highway, and it does alright. Unless you are running a crazy tall tire, or don't like the highway, or have overdrive in your very near future, i wouldn't go that high.

Daniel

Thanks for the information, but this isnt an everyday driver. I plan on racing it down the track when I get time, but it is also going to be a weekend driver. I just rebuilt my engine and have about 500 foot pounds of torque and 550 horsepower. It's a serious machine and I want to make it take off and go like a bat out of hell. Maybe this additional information will help.

i'm installing 4:56's in my car sooon.....i know its a bad idea...but goin to a 28'inch tires in the summr...wanna snap my neck..haha

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72 Ls6 Chevelle project
87 K-20 Lifted 4inches Old school Slotted mags

Pappy said son you gonna drive me to drinkin if you dont stop drivin that hotrod lincoln

With 500lbs of torque and 4.30 gear plan on having major traction problems. With a 28" tire your rpm's @60 will be about 3200 rpm's depending on how loose your convertor is.
I would go with the mentioned 3.55 or 3.73. If you want more rpm at the track get a lower profile slick.

Krayzie, with that much hp and torque you really don't need the super tall gear. Talk to a guy who goes by mc71454. He runs 11's on a 3.55 gear.

Daniel

Thanks Stikman33. Do you know where I could find mc71454? Please let me know. Thanks

Brian

He is all over this board, post a question with his name in the title, he will get in contact with you.

Daniel