CAPTSmith wrote:Just finished my 6.0 LS Vortec, 4l80e tranny with Lokar 16" floor shifter, np241c TC and love it! Used Jeepinpete motor mounts, but hear BJs have good ones also. Major fab work was with tranny cross-member, efi fuel tank, driveshaft mods, fuel lines, and tranny and oil lines. Used Wayne Hartwig for the wiring and he did an excellent job in thinning the engine harness wires, labeling them, flashing the PCM, and answering my many crazy questions! The dependability, power, torque, fuel economy is outstanding ! I truly understand the importance of staying original and did so with my built 360 ci in my '74 Javelin AMX, but with the jeep I am so happy with the swap and was much easier than I thought it would be! Best of luck and if I can be of any help let me know.
I too just completed a 6.0/ 4L60E/ NP241 swap with Slip yoke eliminator, GM EFI tank, hydroboost (Elliott), electric fan. Unfortunately, I am not great at taking pics along the way, so I have no build thread or detailed pics. But I can tell you that everything that CAPT says is true. Once you get going, it is a pretty easy install. Once you have your engine mounts (Searchers 4WD...I think), the engine and trans drop right in. I did modify my cross member, but later realized that I did not need to if I had just moved it forward to the most forward holes in the frame. But...if I did that then I would not have been able to route my exhaust as easily since I reatined the cats. I had my harness reworked and PCM programmed by Wait4ME. They are excellent and very helpful and responsive. Had my rear driveshaft shortened, replaced front driveshaft (stock was too short). Might not have needed to do this either if i used the other holes for the cross member. But you live and learn. The power, fuel economy, idle, reliability and clean exhaust smell compared to the old carbd engine is amazing. You cannot go wrong with this swap. If you have any questions, you can PM me. But, with most things, it is the small things that are the biggest pain. In retrospect, I did not have any major issues with the "small stuff", but the small stuff is what takes up your time. Next...gauges, paint, then more small stuff.
1977 Chief: LS1 6.0, 4L60E, NP241, SYE, Dakota Digital gauges, more to come.