What is your goal for this Jeep? You said you have "restored" the other systems. Do you mean you are restoring the Jeep back to factory condition? If so you would want to stick with the original drivetrain and restore it to original running condition. If you're not concerned about originality then the world is your oyster. Go with whatever you can afford. Anywhere from an AMC V8 to a 4.0L transplant from a later Jeep to a Chevy LS engine, there are many different options out there.
It has a t4 in it, and don't necessarily care about keeping it original. I really just wanna have a solid engine that is reliable. I don't do a lot of off roading, but if i do it's nothing too crazy. I have 33's on it and don't intend on going any bigger.
I'd stay with the 258 but keep your eyes open for a T176. 258/T176/D300 is a fantastic drivetrain combo for the moderate wheeled/streeted CJ
1985 CJ7 Project Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning
Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...
Chrome won't get you home...BUT Rattle Can Black may just get you back"
what are you talking about? I thought the t-176/177 were the exact same tranny except for the the 3.82 versus 3.52 first gear ratio which gives the 177 a little more pop in first. the output shaft is a bit longer i also have in my 1985 cj. maybe somebody mcan glarify this and if more 176 or 177's are out there