I need a set of gears for my race car the 2.73's are holding me back im going to go with 4.11's i dont want to spend alot of money on the stock rear cause i have a 9 inch going in later on i just want to make sure that the carrier size i need is a 2 series i seen them on summit is there anything else i should know before i go and buy them just trying to make sure i get everything i need thanks.

 

If your using the stock 2.73 carrier you will need a ring / pinion for a 2 series. the 2 series go up to 3.08 ratio`s and from there on out the 3 series. you can get a ring gear spacer and use a three series ring / pinion on a 2 series carrier, might be cheaper and better than running that super thick ring gear.

 

And with the power you want to run I would use a 3.73 gear for strength. The 4.10 pinon gear is to small always seems to break.

 

I've got a very similar set p to his and I run a 4.56 gear and slicks with no problems. Well i did when this motor was in my 1980 Impala same thing except I had 1 3/4 primary long tubes and a mini spool, but same gear same carrier, heavier car, and slicks never broke anything. But i didn't hook up well in second gear, and I had a lot less stall so initial take off was dead. Comes down to whether or not you want to drive it much, if you aren't gonna get it out on the highway or drive consistently much over 60 then go low, but if you wanna drive it do 3.73.

 

didn't they put 8.5" 10 bolts in the big b-body cars?

 

Yeah, but not mine for some reason. I know it is all original, my aunt bought it brand new, it had a 305 4 barrel, with 416 heads and a factory aluminum intake. IT only had like 50,000 miles on it when I got it. I found the build sheet under the back seat and it came with a 2.41 rear gear stock, according to everything I could find it should have been an 8.5, but it had 26 spline axles, open diff, and a 2.41 gear. I never had any problems with it before, but I probably wasn't pushin enough power to break anything.