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#1
12-27-2007, 01:44 PM
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?'s about 14 bolt semi floater posi
I pulled a posi out of a 1987 3/4 ton 4x4 burb with 14 bolt semi floater rear diff. The diff had 8 bolt axles. The rear had a 3.73 ratio. This posi looks like what I believe is referred to as a gov lock, i.e. it doesn't have any clutch plates that I can see, or at least not as packed as a regular car posi. I can't find much info on truck diffs, but am somewhat familiar with car diffs and what gears fit with which carriers, so I'm wondering:
Can I use this posi in my 92 k2500 14 bolt semi floater diff with 6 bolt axles? My 92 has 3.42 gears; will the 3.42 crown gear bolt onto the 3.73 gear ratio carrier and be able to mesh properly with the pinion gear once the carrier is shimmed? Can I use synthetic oil in the dif? My 92 GM truck manual says that posi and non-posi carriers are interchangeable in 14 bolt SF diffs, but I'm not sure if there are different series carries as there are in cars. Thanks.
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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis single rear wheel pick-up truck) 1968 Pontiac Parisienne (rust free survivor) 1973 Buick Centurion (four door hardtop; engine will be donated to our 1949 1 ton truck) 1989 Chevrolet K3500 RC/LB (454 & single rear wheels) 1991 Chevrolet Caprice Classic (police cruiser clone) 1992 Chevrolet K2500 EC/SB (almost rust free daily driver) 1998 GMC C1500 EC/SB Last edited by 1968 Pontiac; 12-27-2007 at 02:58 PM. 
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