Posi springs
 

Can anyone tell me if the springs in this 12-bolt posi carrier are originals, higher or lower pressure than factory stock?

The 200 pound springs were standard in the Eaton Posi and they were usually green, but I have seen several that had no paint on them. The 400 pound springs are yellow and the 800 pound springs are supposed to be red, but most that I have seen had no paint on them. The 800 pound springs had thicker plates than the 200 pound springs. You picture is too close for me to tell, but I can tell you that you have the weak daisy clutch plates. I recommend changing them to the solid plates. You do have the better hardened cross shaft instead of the chrome plated one.

Those resemble stock Eaton posi springs , only way to know for sure is too remove 1 and measure free length and installed length and wire thickness and check pressures.
Stock Eaton springs work fine IMO

Ok, thanks for the info.
Would the clutch plates hold up during street driving, with an occasional hard launch?

The only answer that I can give you is; maybe. I've removed a few sets from street cars that were broke, and many that were not broke. That clutch set was a replacement set and as far as I know they were not OEM. It was supposed to reduce clutch chatter, but in many cases it actually made it worse.

I agree with Freddie, the replacement GM & aftermarket clutch plates with the “ear” or paddle type plate don’t seem to work as well IMO, & I’ve seen a lot of them broken after disassembly . The earlier 360* version was trouble free.
We used a lot of GM posi,s in 12 second street type cars in the 70,s and they weren’t a issue, what usually broke were the GM axles.

Moroso Brute Strength Posi is the way to go!

Dan

I measured the wire diameter on a 200 pound spring tonight and it's .105" if this helps.

Thanks for the info guys.
This was a carrier with 4.10 gears I was thinking of buying, but will probably pass on now.