I'm running new Pacer brand 16" wheels that have a 3.62 inch backspacing. Here is the info.
The wheels are by Pacer Wheels. Here is a link:
Go to http://www.pacerwheels.com
Select RWD and you will see the wheel that is on my truck. Click on it and it will give the detail below and more.
Pacer part number is 161M-6781
Wheel size is 16X7
Bolt circle is 8X6.5
Backspacing is 3.62 inches
This back spacing clears the steering arms and even leaves enough room for wheel weights when balancing.
The tires are radial 235/85 R16.
BTW mine is a 3800 but I think the wheel issue is the same as the 3600.
Gater