Quote:
Originally Posted by Simonsays
Looking for some knowledge folks. My 3/4 ton 1966 gmc pick up is getting front end rebuilt. I called eaton springs and was told the stock spring is thier ML 2022 spring which is rated for about 1018 lbs spring rate. Now when compared to the same year chevy c20 version that spring is considered heavy duty for a chevy c20. Same year in c20 the standard spring is listed as ML1766 which is listed at around 722lbs spring rate, this spring is standard for both c10 and c20.
So question, is does anyone have any knowledge of GMC using heavier duty springs as standard springs? I'm debating going with the c20 version of standard to get a more plush ride, since the standard in GMC is heavy duty version according to Eaton springs. Hopefully someone knows about this or have ran across this at some point. Thanks in advance.
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I think they are using P/N 3817997 std. for the Chevy truck I6 230 63-65, 250 66 and 3817998 HD for the small block V8. GMC used the same springs for their I6 only in 65-66. They change the springs in 67.
The I6 230 and 250 are about 440lbs. The Chevy V8 350, 283, 327 are about 575lbs. GMC 1966 V6 305E-795lbs and V6 351-860lbs. P/N 2436529 std and 2440323 HD. They would be special order.
I would go with the MC2022 spring. The ML1766 iare for the I6.
Now the spring rate (spring deflection rate) for the ML1766 (3817997) is 173 and load rate is
1018lbs. MC2022 (3817998) spring rate 239 and load rate is 1152lbs.
Call again and check, I could be wrong.