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Click on image for the lowdown. 
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| | | | Joined: Mar 2004 Posts: 874 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 874 | What year truck??
The Advance Design series 3/4 ton frame is longer and the back half is narrower than a 1/2 ton. The fronts are dimensionally
the same. I believe the 3/4 frame is a little heavier ga. is all.
A 1/2 ton front axle of the same vintage will bolt in.
I do know that a Task Force series 1/2 ton rear spring pads are within 1/2" of the 3/4 ton rear...close enough to make it work.
Most other donor rear ends will need the spring pads relocated.
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