You would pretty much need to change out both
axles to 1/2 ton to get six lugs.
Check with a local shop that sells truck tires
or do a search online for truck tires, there are lots out there. You might also want to consider
switching to 16" 8 lug rims. They are pretty plentiful...atleast at my local u-pull-it.


Steve

'49 3800
'52 3600
'57 3100