[83GMCK2500]

Originally Posted by jpmanyhearts

ok so the np208 is in the square body's so what is in the 98 chevy truck ?

81-91 squares used NP205, NP208, and NP241 with passenger side front output. The 241 replaced the 208 in the late 80s (don't know exact year), it has better oiling, 6-pinion planetary, few other upgrades over the 208. (In late '90 and '91 these t-cases have VSS instead of cable drive)

88-95 GMT-400 trucks used a driver's side drop NP241, Borg-Warner 4401 or B-W 4470. The latter two found in K3500s. The B-W cases have PTO provisions.

96+ GMT-400 still had the NP241, an electric shift version the NP243, the two B-W cases, and later in the run they added the NP246, still a part-time electric shifted case, but it had an "Auto" function in the control. The Auto 4WD used a variety of inputs to control a set of clutches in the t-case that would engage/disengage front output as needed.