Here's a '78 CJ-5 with Golden Eagle skin. Logotastic!
A 151ci four-cylinder built by GM (their Iron Duke) debuted in 1980 (Jeep called it Hurricane again), which was a two-barrel with a 8.2:1 compression ratio and 4.00x3.00-inch bore-and-stroke. It made 82 hp at 4,000 rpm and 125 lb-ft of torque at 2,600 rpm until 1983, when there was only the 258.
Out of the box, there was a BorgWarner T-90 manual three-speed, followed by a BorgWarner T-14 for the V-6. An optional T-98 heavy-duty four-speed was available for the CJ-5 Hurricane starting in 1966; the three-speed with the V-6 was fully synchronized. The 232 and 258 could be hooked to a three- or four-speed, while the 304 was mated to a three-speed; again, only the CJ-5 could opt for the four-speed.
A mandatory option (nothing like an automotive oxymoron) with the four-speed and the six-cylinder was a heavy-duty frame. In 1971, the T-14 three-speed was fully synchronized with the V-6; the four-cylinder had an optional T-98 four-speed. In 1972, the 232 and 258 used a BorgWarner T-14 three-speed and a T-18 four-speed; the V-8 ran with the T-15 three- and T-18 four-speed. In 1976, the Tremec T-150 three-speed was used, then the Tremec T-176 starting in 1980.
The Dana Spicer Model 18 was the first; the switch to Dana Model 20 started in 1972. By 1980, it was a Dana 300.
The CJs used semi-elliptic leaf springs both front and rear. The front axle was a full-floating Dana Spicer 25 until it was switched to a Dana Spicer 27 in 1966. The rear was a semi-floating 44, with available gearing of 4.27s until 1967; those were 3.54s. For 1972, the front axle was a full-floating Dana 30; the rear went to a semi-floating AMC 20 in 1976; 3.54s and 4.09s were available. A Powr-Lok diff was available starting in 1966, and Trac-Lok came in 1971, which was standard equipment on the Renegade.