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This is what I found
https://www.summitracing.com/cart/estimateshipping#Estimator

I have a standard cab stepside truck I'm going to lower 4/6.
I'm looking through wheels
Front 20x8
Rear 20x10 or 20x12

I'm needing help with what offset to get and tire sizes
...

Was a nice 2 hour trip traded a 700R4 trans for it
https://scontent.xx.fbcdn.net/v/t31.0-8/15304222_10211855881291919_8311880673871134970_o.jpg?oh=ec6d73e3949a7f0fcba73399724558f2&oe=58F600F5...

thanks guys I picked up another step side bed in better shape. Now to get the body work and primer done on it before I put it on.

I have a 89 C1500 Standard Cab Step side
Plans:
LM7
4L60E or 4l80E
HP Goal 450-475 would like 500
Pro Charger (:ummm:)
4/6 Drop
18s staggered
HOK Hot Rod Flats Balck
Cowl Hood