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Old 04-27-2014, 12:34 PM   #18
83GMCK2500
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Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
Re: What's the diff.....??

BigRed76 incorrect, see b454rat's post.

To add further information, in the GMT-400 (88-02, technically) platform the 6-lug 9.5" 14 bolt semi float was in 1500s that had the RPO F44. In early -400s GM built those ridiculous 6-lug 2500s which also had the 6-lug 9.5" axle. I call them ridiculous because GM should have just called it what it was, a heavy half... There is an 8-lug 9.5" also used in the -400s on lower gvwr (I think <= 8,600#) 2500 trucks. Can't forget to mention the rare 5-lug 9.5" 14 bolt SF either, 454SS trucks.
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Devin

1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt
1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050
1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350

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