CHEAPest way to convert rear axle bolt pattern to big bolt pattern???

Thats why i suggested the cnc machined billet ones made by ballistic fabrication. Not trying to be pushy on them just suggesting becuse you said youve only seen thr cast version which i myself would be leery of to. But they run their spacers on high tourqe rock crawlers and desert race trucks so i wouldnt worry one bit about their quality

wheel adapters have made serious strides in the last 5 years. the cast aluminum trans dapt type are crap and they crack, ask me how i know. the billit aluminum adapters are super strong and they are used in all types of applications just as you stated. hell, i have seen rock crawlers using 2" adapters running a 16 x 12 inch rim and a 44" inch tire. you want to talk about a serious stress test, and a lot of these wheels are still using 5 lug nuts to secure the adapter to the hub , and 5 lug nuts holding the wheel on. i have used 1" 5 x 4 to 5 x 4 1/2 billit aluminum adapters for years on the same daily driven car to include serious burnouts without ever having an issue. i used to periodically take each wheel off and re-torque them, not once has a lug nut has ever remotely backed loose. i also painted them black, so any stress cracks would be completely obvious, never a single mark on them. i paid 69 bucks a pair and never looked back.