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Re: 3.73 posi rear question.
If your current rear ratio is 3.73 or above then you have a 4 series carrier, if your current ratio is below 3.73 then you have a 3 series carrier. Either way you should just have to swap the carriers with ring gear attached and shim it right. (easier said than done) If you decide to weld on some axle saddles let me know, ive got a pair im not using anymore. (a good friend talked me out of using a 10 bolt)
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1986 C10 - LWB, 305/700r4, posi, vortec heads
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