Why cant I........

[71'tahoe]

Hey guys,
Hope someone can helpme.I have several trucks from 58'-97'.Here is what is confusing me.I have seen everyone swap complete x-members from the 73-87 trucks into 60-72 trucks. How come you cant just swap arms.The project that I'm getting ready to start on is a 65'1 ton flat bed work truck,I want to swap to disc brakes.I have a complete x-member from an 87' 1 ton truck,why cant i just swap the arms and spindles.Do i have to bolt in the complete cross member from the 87'?I will also be adding the 87'power steering and hydro boost.I'll try and post pics when I start.I just dont want to do more than I have to.Thanks for any help you can give.

[poorboy]

According to mongo you can just swap arms.Here's a link
http://67-72chevytrucks.com/vboard/s...d.php?t=171667

[Chevy Fleetside]

If it is a 63 and up you can just use the arms and spindles. If it is a 60-62 then you have to swap out the whole crossmember seeing they have torsion bars... I just swapped out the control arms and the whole center link also from a 75 into my 65...

[71'tahoe]

Poor boy,chevy fleetside,mongo,
Thank you all very much now i can start my project this weekend.You guys have help me out a ton.I was all worried id have to yank the engine,etc.Thanks again,Ill post pics when i start.