Dan, sounds like you may have an Acro rearend, with a steel axle. There are a couple of ways to be able to use it, without a lot of expense, you can move, make a new motorplate, with the engine in the center, or take your axle to Acro in Greensburg, and have them either put in a new axle, or remachine the one you have, to make it a 3 off. Your best bet, if you can come up with the money, would be to update it to their aluminum splined axle, then you would be good to go for a good while, and be able to move the rear wheels in and out for adjustment, it might cost you a bit, but you'd lose the steel axle weight, and maybe not have to work much on the rear till your ship comes in. Good luck, you can google them for their ph #. Bob!