Seals are easy to buy and change. . you can also pull the abs sensors etc. . any brake parts etc. . and the whole axle could be done 400 degrees is ok for it. . that wouldn't hurt it... just drain the lube real well... and duct tape the end tubes , and pinion etc. . sand blast carefully around that and you'd be ok just some ideas. . after you replace the axle seals, pinion seal, and diff gasket what else is there that couldn't handle 400 degrees? You still could kee pthe gears in the case...