Join Date: Jun 2011
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There is no solenoid in the front diff pretty sure that's a soccer mom IFS Chevy thing... The factory hubs auto lock through a vacuum system. Seeing as you have warn hubs now that does not come into play anymore. (Good move by the way those auto lockers are POS) Now is the noise coming from your transfer case when you flip the switch or the axle itself? Turn the front drive shaft see if it is engaging properly. Also check your hub bearings if they are in super poor condition sometimes your auto lockers won't engage. I have seen it happen.
~1973 F250 Highboy
~2003 F350 Super Duty XLT FX4 6.0 Powerstroke
4.56 Yukon Gears,Detroit Locker,37x13.5x17 Interco Super Swamper M16,8in Custom Lift,Bilstein 5125 Custom Valved Shocks (Triple Front/Dual Rear),Fabtech Dual Rear Shock Kit/Traction Bars,ARP Head Studs, Sinister Headers/Y Pipe/Regulated Return,175 cc Injectors,Edge Juice Platinum with Attitude,SCT Tunes,Snow Performance Stage 3 Water Methanol Injection,FASS 150/180,Banks Techni-cooler System,Fluidampr,4in Straight Pipes.