In the process of doing an engine swap in an 90' YJ. I'm running 44" Super Swampers with 4.56 gears as of right now. I had an inline 6 but have purchased an AMC 401 to put in its place. I currently have the AX15 transmission and NP 231 transfer case but have the plan of replacing with a T19 transmission and Dana20 transfer case. What are all of the issues that I will run into and how do I go about fixing them?
Last edited by mousemjh12; 05-24-2013 at 01:21 PM..
I could, I'm not against it, just came across the T19 and Dana 20 for dirt cheap and they were in great condition, I'm still learning but I've had a few people tell me that the AX15 is hard to beat, just not heavy duty
not the best motor in the world, it can be built, but it's expensive to make any decent power from. a fuel injected 4.0 makes similar numbers stock vs stock.
for 44's i'd be looking for minimum 5.38 gearing, probably even higher with bigger axles. i really can't believe you're able to go anywhere that isn't pavement with 44's on a d44/60 combo too. that's a lot of tire.
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.
there is nothing about an ax-15 np231 combo in front of 44"s that is going to last very long. especially after tossing in v-8 power. the ax-15 will give up the ghost first, i speak from experience.
44"s is alot of tire like rat said, there is no way on gods earth i would think anything numerically lower than 5:13's would even come close to keeping you in the power band for the older 401 amc motor.
i am merely going on speculation since i have no concrete evidence other than common sense to go on. it is pretty much a standard to go with 4:88's on 37"s, this is the only piece of data that i am basing my statement on.
i'm not even going to touch the axle debate, god kills a kitten every time someone argues axle/tire pairing on JF.
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5.2lswap, metalcloaks, bedliner, tucked belly, d60's, soon to be nv4500 and d300.
If your front D44 is a right hand drop, then you should have no problems with that set up. I would have to agree that the stock 401 v8 vs. injected 4.0 both produce nearly the same numbers, and both can make great motors if you're willing to invest in them.
But, my old hot-rod motto is "there's no replacement for displacement."