Forget about using a divorced t.case in a YJ. Just not enough rr driveshaft length.
Here's some t.case info:
Transfer Cases:
NP203: Full time, chain driven, steel housing, 2:1 low. Big, heavy.
Big 3 used it until about '79. Both left and right drop [Conversion to part time kit available]
used in:
'73-79 Blazer/Jimmy/P.U w/ V8 and autos
'74-79 Dodge Power Wag/Ramcharger
'74-76 Ford F100 w/V8 and auto
'77-79 Ford F150,F250, '78-79 Bronco (optional)
NP205: Part time, gear driven, iron housing, 1.96:1 low.
Big 3 used it. Both left and right drop. Very heavy, very strong.
used in:
'69-73 Blazer/Jimmy with auto
'73-74 Jimmy with auto (opt)
'70-73 GMC P.U/ Suburban w/ manual trans
'81-87 Chevy and GMC K3500 P.U
'69-74 Dodge Power Wag
'80-93 Dodge Power Wag, W200, W250 crew cab, W300
'76-79 Ford F150, F250, '78-79 Bronco.
NP208: Part time, chain driven, aluminum case, less stout than above, 2.61:1 low
used in:
'80-91 Blazer/Jimmy
'81-87 GM K1500, K2500, K3500 (optional) P.U.
'80-93 Dodge Power Wag, W150, W250 (except crew cab)
'80-85 Ramcharger
'80-86 Ford F150, F250 (except H.D.), Bronco
'82-84 Jeep P.U. except J10,
'85-87 Jeep J10/J20 P.U. w/auto
'80-83 Jeep Cherokee/Wag
NP231: "Command Trac", Part time, chain driven, aluminum case, 2.72:1 low, weaker yet than above. A weak 3 pinion planetary gear/ 1 inch chain. No true neutral for flat towing.
Most desireable version is the NP231D found in Dodge 1/2 ton trks. [larger chain/hub/sleeve] Short shaft kit needed because of the 9.25" tail shaft.
used in:
'89-present, S-trucks, Blazer/Jimmy
'87-present Dodge Dakotas
'93-present Dodge Ram 1/2 ton
'87-present Jeep Wrangler
'87-present Jeep Cherokee and some Grands
NP242: "Select Trac", Part time/full time, chain driven, aluminum case, 2.72:1 low, similar to the NP231 except for extra full time setting.
used in:
'88-present Jeep Cherokee (optional)
'93-present Jeep Grand Chero (without quadra trac or command trac)
NP241: Part time, chain driven, aluminum case. Stronger than the NP208. 2.72:1 low
replaced 208 in late '80's Dodges and
'88-present Chevy P.U./ Sub.
Dana18: Part time, steel housing, gear driven. Compact. Gears spin all the time. rr output offset. 3 versions of intermediate shaft: 3/4"/1-1/8"/1-1/4". Noisy. 2.46:1 low.
used in:
'45-71 Jeep CJ and
'47-65 Jeep P.U. /wag
'61-66 Scout
Dana20: Part time, steel housing, gear driven, 2.03:1 low. Straight through design. Flat tow, O.K.
used in:
'66-77 Ford Bronco (driver side drop)
'72-79 Jeep CJ, except Quadra Trac (pass side drop)
'63-64 Jeep Chero/ Wags w/ manual trans
'67-73 Jeepster/Commando
'67-79 Scout and Scout II (pass side drop)
Dana300: Part time, steel case, gear driven, 2.61:1 low. Straight through design. All helical cut gears-quieter. No flat tow without modifications. Weak-tailhousing output.
used in:
'80-86 Jeep CJ
'80 Scout II ( w/ 'Texas' bolt pattern case, same as D20)
Warner Gear 13-45: 2.74:1 low
used in:
'86 Ford F250HD, F350
Warner Gear 13-56: 2.69:1 low
used in:
'87- 93 (present?) Ford F250/350
regards, as always, jefe