I'm not sure what gears I have now, it's an open 10 bolt (code CB1019W).

I would like to know what's in it and if I would need to change carriers to go up to 3.55s or higher.

thanks for any info you can give.

Originally posted by JakeS:
I would like to know what's in it I would pull the cover off and go from there..gears and carriers get changed over the years and that code might not mean anything at this point,and removing the cover and checking is the only reliable way to know for sure IMHO and experience.

you can tell what you've got inside if you jack the car up, spin the rear wheels by hand, and find the ratio of driveshaft turns to wheel turns.... example: if the wheel turns 1 revolution to the driveshaft's 3.5 revolutions, you have a 3.55:1 rear gear ratio.

you can also tell if it's a posi or open diff if the while turning the tires by hand, they spin together in the same direction or in opposite directions. i believe posi spins opposite, and open spins in the same direction, if i'm not mistaken...

for a '64 to '72 chevelle 8.2 10-bolt, you will need to replace the carrier if you cross over the 3.08 ratio... for example, if you go from 2.73 to say, 3.73 or 4.56, you will need to replace the existing 2-series carrier with a 3 series.

I jacked up the car and it's a bit past 3 and a quarter turns for one turn of the tire. I guess 3.36:1 is about on target.

Since it came with a gear higher than 3.08 would i need to change carriers to swap in a set of 3.73s?

nope.... 3.36 and 3.73 share the same carrier

nope.... 3.36 and 3.73 share the same carrier

both wheels spin in same dirrection is a posi or limited slip .opisit dirrections is open carrier if its 12 bolt 308 and up for 3 series carrier ,if its ten bolt 273 and up

sorry missed one 8.2 is 308 and up also.8.2 have 3/8s bolts 9/16 heads on ring gear 8.5 have 7/16s bolts with 5/8 heads

are you sure, junkyard dog? i got the carrier info for the 8.2 10 bolt off of richmond gear's website. thanks for the correction on the posi... i wasn't too sure on that one.

well im pretty sure since we put 411 gears in my sons car and used a 308 carrier to do it the 2 series carrier some one else tried to set up would work.