Join Date: Mar 2000
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Re: YJ Questions ???
I am running a 90 YJ 2.5 liter in mine at the time. It has been it since the start of summer, also the AX5 tranny and NP231, which is the same set up youll have. The only mods I did to the mill(since I only thought I was gonna run it for a month or so) was a K&N filter, high flow exhaust and cat, and recently an MSD Ignition. The motor is very smooth, and has good reliable torque starting at about 800 rpms,(the MSD ignition hepled low end torque considerably enough that I would highly recommend it). I am running 4.56 gears and a 4:1 Tera Low conversion,(its a very good upgrade but too expensive). With the present upgrades, I was able to run my 35" SSRs at highway speeds of about 65mph without to much problem in 4th gear(I dont grab 5th gear in 2H very often though). You will be able to maintain at least 55 on almost any hill by dropping to 3rd and turning about 4000 rpms(which doesnt seem to affect the engine at all), it purrs right along at the higher RPMs without even a sign of overheating. The mill will run or start on any angle and never even sputter, and also maintains good oil pressure and engine temperatures under the most brutal conditions. It runs cool even when playing at the hammers in the middle of summer, easily 120 degrees plus in those canyons, running up hill all day long at at less than 1 mph with not even a breeze on the radiator. 4.56 gears will get you where you want to go but you will be clutching on some obstacles, without the 4:1 in the T case. Like I said I thought when I emergency swapped the 2.5 it would just be for a few weeks untill I put together a V8, but Ive been extremely impressed with how well it gets it awn, off road.
It will be retired though in about another month, sniffff, snifff, its kinda sad. Im not sure what Im gonna do with the old mill at this point, might have to hang onto to it in case the Mustang motor cant cut it, hahahaha.
If at 1st you dont succeed, your replacement will try and try again