The engine and transmission options were limited between 6
motors and 3 transmissions some were offered before 1973 but fall into the
highboy category. The motors are straight sixes and v8’s and they are the 240
straight six (1967-1974) the 300 straight six (1967-1977.5) both of the
straight sixes were one barrel carburetor’s.
300 straight 6
The v8’s were the 351m/400 starting in 1977 the 352 (1967)
the 360 (1968-1976) and the 400 (1977). The transmissions were the ford three
speed toploader (1967-1971) the np 435 3 speed with bulldog first and the c6
select a shift 3 speed.
Np435
The transfer case was a part time
np205 or the full time np203. The np203 is rare but not very desirable because
they were not very strong the np205 is very desirable because of the strength and
durability of the internals and casing often called bulletproof. The reason the
np205’s were so strong is they are gear driven rather than chain driven so they
didn’t wear out or snap chains.
The rear ends are dana 60 16 or 30
spline the number of splines on the axle shaft’s these are commonly swapped for
the dana 70’s or a gm 14 bolt. The front ends are two different types of dana
44’s 8 lug low pinion one is the heavy duty versions and were closed knuckle
until 1975 then changed to open knuckle. There was a very rare dana 60 front
axle used in crew cab highboys from 1973 to 1975.