Can't help you with the diff part as the truck I did the timing chain set on last weekend was a 2WD, but...

I found that disconnecting the sway bar and cranking the wheels to full lock helped a lot since it moved the relay rod forward a couple inches.

Great kit, btw, EB, impressive quality and very complete. <img src="/forums/images/graemlins/kewl.gif" alt="" />

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
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"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson