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Heres a start. The only 3spd on the tree in a 4x4 that I have had, came in a 72 Jimmy.
If I remember right (long time ago) the transfer case was a dana 20 and the adapter was part of the t-case. The whole set up was totally different than the 465/adapter/205 that I put in. Yes, the RPO might help.
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Real Trucks are Built not Bought
Building: 1981 GM SB LowRider
1985 GM K3500 3+3
1981 GM K2500 SSB
1980 GM K2500 X-BC Hydro
1979 GM K3500 3+3
1976 GM K5 Blazer
1970 Custom 10
http://bc4x4.com/
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