I Have a 1989 with a 400smb and a turbo 350 tranny. I would like to put a shift kit and dont really know what brand i should lean towards. and i would like to change the gears in the rear end but im new to all this. So could anybody show me the right direction to go.

 

Just go out and buy some 4:11 gears and go at it, nothing to it. This change will wake up your car. That 400 smb must be putting out some awsome power.

 

Go with a 373 gear if this is a street car. A 411 is way to much gear for a daily driver. As for a shift kit get a B&M.

 

hey man i have a 91 with a built 350 and a th-350 and 3.73 gears. and since its a street car if i had 4.11 gears i would very very unhappy. go with 3.73 gears and B&M shift kit.if you go 4.11 you will being doing damn near 4000rpm at 50mph, for being a street car i almost want a 3.23 gear but im planning on a built 700-r4 trans and keeping the 3.73 gears

 

thank you guys for the help im slowly learning about these cars. 91 I have also thought about putting a 700r4 in mine.

 

Im running 3.73's with a 3 speed and I run 3k on the highway. 4.11's are just not a gear to use if you plan on doing anything more than driving down the street to get ice cream.

My rear gears are the ONLY job I farmed out to a local shop. (went from highway 2.77's to street 3.73's) You need a few special tools and failure to procure and use them will most likely end up in you fragging your read end in a few hours. Im assuming when Black says its no big deal hes either yanking your chain or hes got all the tools.....

A 400 SB with 3.73's will be SICK!

 

Thank you guys for all the input.