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#1
12-04-2018, 05:01 PM
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Posi springs
Can anyone tell me if the springs in this 12-bolt posi carrier are originals, higher or lower pressure than factory stock?
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Rick 69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.) 69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan  Don't text and drive. Somebody's life may depend on it! 
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#2
12-04-2018, 05:41 PM
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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.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed Last edited by big gear head; 12-04-2018 at 05:43 PM.
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#3
12-04-2018, 05:42 PM
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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 Last edited by rszmjt; 12-04-2018 at 05:46 PM.
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#4
12-04-2018, 05:47 PM
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Ok, thanks for the info.
Would the clutch plates hold up during street driving, with an occasional hard launch?
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Rick 69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.) 69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan Don't text and drive. Somebody's life may depend on it!
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#5
12-04-2018, 08:02 PM
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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.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed
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#6
12-04-2018, 08:55 PM
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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.
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#7
12-05-2018, 12:02 AM
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Moroso Brute Strength Posi is the way to go!
Dan
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69 300 Deluxe Post Sedan Frost Green 69 SS396 300 Deluxe Post Sedan Lemans Blue SOLD 70 Buick Skylark Post Sedan Gulfstream Blue 70 Buick Skylark Post Sedan Burnished Saddle http://m.youtube.com/watch?v=PM3DE8qI2NY https://m.youtube.com/watch?v=Yn4xEmGypUw
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#8
12-05-2018, 02:14 AM
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I measured the wire diameter on a 200 pound spring tonight and it's .105" if this helps.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed
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#9
12-05-2018, 09:43 AM
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Thanks for the info guys.
This was a carrier with 4.10 gears I was thinking of buying, but will probably pass on now.
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Rick 69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.) 69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan Don't text and drive. Somebody's life may depend on it!
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