I have been researching this, but yet to do the mod. I talked with jb conversions and they sell a 700R4 output shaft that will mate up with the D300 using a NP208 adapter. I purchased the NP 208 adapter for $50 on ebay. The shaft is about $150 - 175 if I recall correctly. I think I will have to do some slight mod on the NP 208 adapter, but I think it will be straight forward. One of the holes won't quite line up, so you can either just go with 3 instead of 4 holes, or mod the NP 208 to make the 4th fit. I think I will mod the 208 to where all 4 hole will mate up. $200 vs $500 will definietly make me try it.
I'll keep you posted as I get more info, but I will definitely be doing this.
1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.
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In Progress - 4.56 gears, Aussie Rear Locker, Moser 1 Piece Axles
Coming Soon - CV Shafts, Welded Tubes, trusses