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Guys
I have a 12 bolt chevy rear currently with non posi 273. I want to purchase a posi carrier and gears. 355 or 373. Do I have to take the rear apart to figure out how many splines and what clips and things or is there a way to ID this prior to disassembly

Also what carrier woud be the right one ...

Does the Carrier for a limitied slip 12 bolt rear end matter if it comes out of a lets say impala and is going into a 12 bolt chevelle.

Is there some way to tell what posi unit will or won't work in a 12 bolt chevelle rear

As always thanks for the info
Mikek

:D

OK
So I am into most times cruising around town. There is or should not be a ton of highway. I do like to jump on it a little, but I am putting this together more for my wife to drive. SO I am guessing 3.55 sounds like the right gear.
do I need to worry about which Eaton posi, Dana posi, Warner ...

:?:
OK
SO it is a 12 bolt. The Casting code is what I have presented.

I would like to put a posi unit in the car. The gearing currently has some to be desired off the line but is great for highway. I would liek to get to 3.31 or maybe as far as 3.73. not sure
Can you give me you opinion on those ...

Ok
So the casting number off the drivers side rear of the motor is 3970010 which I guess mean 350. But the stamp say t0916ckh. The trany is a th350

Is there any other info that I can get with out taking the engine apart that would tell

I appreciate the insight into the numbers on the car. I have double checked the engine code and the only thing that might be different is the 16 which might be 15.

Any way is there a way to tell if this is actually a 307 (another place for the codes) and also is this the original motor

I just purchased A 71 chevelle and am told that the car is all original drive train. I have pulled some numbers off the motor and rear.
vin 136371r117117

on front pass motor block pad I found t0916ckh7 and 117r411869

on the rear
driverside front embossed 3969278nf
driverside rear web con2 ...

I just purchased a 71 chevelle with a 12 bolt rear. Where can I find the numbers to ID the rear and what they mean