Like the title says, I'm just embarking on a project to build up a CJ-2A. I'm starting with the following components (thanks again, George!): FC-150 frame (basically identical to a CJ-5 frame) CJ-2A tub, fenders, hood, and grill Roll bar Dana 25 and 41 axles, with 31" tires. New Rancho springs 170CI or 185CI (not quite sure which yet) Studebaker Champion flathead six-cylinder engine, complete with all accessories (including an adapter plate to mate it to a T90). My plan for this Jeep is twofold. I want to use it as a platform to learn the basics of working on vehicles (I have some experience as a small engine mechanic, but nothing automotive). Second, I want a recreational vehicle for cruising around the back roads and trails around my home. I'm not concerned with keeping the machine in any sort of original condition. I want it to be a fully functional offroader, but I'm not looking for anything extravagant (no V8s or 35" tires, that sort of thing). What I'm wondering is what sort of changes/upgrades I might want to make over the OEM parts that a CJ-2A would have had. Primarily, what I might need to strengthen to accomodate the larger-than-stock engine. It's spec'd at 90-100 horsepower and 140-150 ftlb of torque; will the Dana 25, Dana 41, and T90 handle this reliably? If not, what would be my best options for upgrades? I already plan to improve the brakes - are there any recommended way to do that besides using the 11" brakes from later Jeep? I don't have any objection to doing that, but want to know all my options. I also plan to put in a Saginaw power steering unit (and conveniently, the frame already has a mounting bracket for one). Is there any reason not to use a T-18 transfer case? Lastly, I'm wondering about tire size. The tires on it now are 31" tall and pretty wide. I want to keep the tires small enough to make best use of the stock gearing if I can, but at the same time I do have more power than the 134 engine had, so maybe bigger tires would be fine (and would give me a bit more ground clearance). What are your thoughts on tire size? I've seen many people say that a wholly stock flatfender can go just about anywhere, but it seems that most people building up Jeeps go with tires much larger than the originals. Is this just for looks, or for specialty use (big rocks, etc), or is there some general-purpose advantage to big tires? Thanks!