ok question for the experts. i am looking at swapping in a pair of f450 axles inder my 72 IH truck. would the axle hold 2,000 lb of motor??

 

Cab & chassis F450/550 axles are rated for 7,000# max 905-up)in the front, or only 6,000# for 04 down. Usually come with lighter springs though. The F550 rear is rated for 13,660# or 14,706# (with payload plus option recently available) The F450 cab/chassis rear is rated at 12,000# or only 11,000# for 99-04 cab chassis f450's. You would need to know what your IH weighs loaded to know which axles would be enough.

 

Cool,so the earlier f450 front axle could handle a 6v71 detroit with ease then,right?

 

A 6V-71 is 2000 pounds, give or take, so yes, you're safe, unless the front of your 1972 IH is over 6000 pounds without the engine.

 

No its not that heavy up frony without thee engine. What is the bolt pattern? 10 lug right? I think it is disc front drum rear?

 

I'm thinking an IH with a 2000# engine has to weigh over 6,000# on the front axle, unless the engine is behind the axle. I'd be looking for 05 up 550 axles if I were you. 10 lug, disc front and rear. My 09 F550 weighs 5840 on the front axle with just a V10!

 

Currently as a cab and chassis I weigh in at 4500 lbs. Truck is a 72 ih 1210 pickup,so with engine I should be around 2500 with axle up front