Re: Axles, trannies, and tire upgrades
I am interested on how you fit 35" tires with only a 3" suspension lift?
You have the same set up my YJ did have. Those components are too weak if you do much offroading. On the street they will be fine. If you go offroad you will be asking for trouble.
The AX-15's upper limit is debatable, but I will tell you what the limit for mine was. I did some mild engine upgrades(K&N, flowmaster, TR upgrade...like I said mild) and put on a 4" lift with 33" Swampers. My AX-15 started going downhill rapidly. I upgraded it to a NV4500 before it went completely, but it was on the short rows. If I had it to do over again I would have went with the Ford T-18(really don't need 5th in a Jeep with tires that big or you are just being dangerous).
Have you changed out your R&P yet? The D30/D35 combo is not going to last long at all off-road. The front D30 had the small 267x ujoints and will sheer when cranked over and giving it some throttle. The D35 is the weakest rear axle ever offered in a jeep. 32" tires and a 4 cyl. can easily break one(even without lockers). There are kits out there that are supposed to "fix" those weak points, but they are all just bandaids. They just cover up the problem until you forget about them and they get worse. You best,and cheapest, bet is to find a '87 and later model Jeep Grand Waggoner and get these axles(D44's front and rear). D44's will hold up fine with 35" tires. Do a search on this topic, there is tons of info on this subject. Ask questions on the specifics if you need to. There are also other options to consider as well, so get ready.
The 258 is a good motor. With a little help it can easily power 35" tires. The first and easiest suggestion is to ask what R&P ratio are you running. If you haven't changed the R&P to a lower ratio(numerically higher) to compensate for the larger tires then your engine will be anemic, at best. Bottom line is the 258 is fine, but some of us(like me) crave V8 raw power and sound.
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<font color=green>llll '90 YJ</font color=green>
<font color=green>"There are no shortcuts to any place worth going."-Anon.</font color=green>