Engine Swapping in a 304 to AMC 2.5 ? B bigmikeysr Jeeper Posts 1 Thanks 0 Location New Lenox, IL, USA Vehicle(s) 1986 cj7 Jul 9, 2026 #1 I have A 78 CJ7 with a AMC 304 . I want to swap into a 85 w/ amc 2.5. What will it take?
Manic Mechanic Full Time Jeeper Gold Supporter Posts 2,424 Featured 1 Media 188 Solutions 14 Thanks 746 Location Thurmont MD Vehicle(s) 85 CJ7 4.2L 258 .040 over, T-5 trans, dana 300, dana 30 front 3.23 and lock right locker, rear amc 20 3.23 one piece axle shafts traclock 79 CJ7 304, th400 auto borgwarner 1389?? qudratrac stock rest unknown. 89 YJ 4.2L 258, AX-15 5spd, NP231, dana 30 front, dana 35 rear with posi, gears unknown 92 YJ 4.0, AX-15 5spd, np231, dana 30 front, dana 35 rear. Jul 10, 2026 #2 Motor mounts, engine, Transmission , exhaust, some doo dads and odds and ends. Otherwise pretty straight forward
Motor mounts, engine, Transmission , exhaust, some doo dads and odds and ends. Otherwise pretty straight forward
G grimmjeeper Jeeper Posts 32 Thanks 18 Location Castle Rock CO Vehicle(s) 1983 CJ7, 258, T176, D300, D30, M20 Jul 10, 2026 #3 Transfer Case is also likely to be a big decision, tied to the Transmission you go with.