| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | You probably have 5/10 bolt pattern, 22.5 wheels for these are getting rare, still have low rear gear ratio to match your original engine.
Any Diesel engine is going to be expensive, 6bt, while perhaps less expensive initially, is probably going to cost more interesting long run, no way will it fit in the engine compartment, much less fit an I'cooler, adequate capacity radiator.
Some Dana 80 axles and their associated front axle come with 6 lug modern bolt pattern, 22.5 wheels available with this pattern-Grigg did one-look on airport vans., modern gear ratios available.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| 
