Check this months 4 wheel & off-road there is an article about GM 3/4 and 1 ton half shafts. Its part of another story that ultimately tells you to ditch the IFS and go SA. 
i wish i could give ya more info but i was just reading it in the store i did not get my home copy yet. PM me if you want the name of the real bad A** halfsafts that they use for CORE Pro 4, i know a guy 
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(My Truck) Black 2008 Chevy Crew Cab Short Bed
4x4 Z71 LTZ LMM
Speedliner, WeatherTech FloorLiners, B&W Turnover Ball
(Work Truck/Tow Rig) Black 2005 Chevy Crew Cab Long Bed Dually
2WD LT LLY
Transfer Flow 100gal in bed tank, B&W Turnover Ball, Edge/Attitude Level 2 all the time, 4inch Turbo Back Exhaust with Cat Delete |