What's the application? If it's slow-n-low, there are better ways to go. If it's fast-n-furious, you're right to be so curious.

(Apologies for the rhyme, happens all the time.)

The IRS is a nice high performance setup, will give you better cornering but keep in mind the car it was designed for weighs about half of your Advance Design truck. Unless you're planning on racing, and have already made massive weight reductions, look into just lowering it or replacing with a higher geared straight axle.

-Boyo


'48 Willys CJ-2A / '55.1 Chevy 3600 / '66 Austin-Healey 3000 / '04 Volvo wagon (parenthood!?)