Like mentioned, the 9.25 can handle the 38's. Chrysler actually put quite a few in the 3/4 ton trucks as an 8 lug version, so they're pretty stout. Its only real weakness is the C-clip which really isn't that weak, and the lack of lower gearing. The problem you'll have is with the D44. They are fairly stout axles for 1/2 tons, but won't last with 38's. But then again, you said thornbirds
, so you won't be going far anyways 
