rear ends, back spacing, and wheels

[bugmasta]

ok guys, i have spent 3 days reading and researching the best i can so please don't flame me and tell me to go do a search. i just want to confirm what i have been reading and get direct input. here is what i have:

1968 C20 LWB with a 1972 c10 rearend and c10 conversion drop spindles on the front.

front end has 72 rotors and the rear has 72 drums.

i want to use Boss 338 wheels and i know there are issues with the fronts.

i am considering 20x8.5 fronts with 4.5 back spacing and then 20x10 rears with 5.25 back spacing.

these are my questions:

will this work?
will i have to grind the front hubs?
will the tires rub the rear?

currently running 17" wheels and want something to fill the wells better. here is a quick pic as we were loading it to head to the glass shop:

[lolife99]

Originally Posted by bugmasta

ok guys, i have spent 3 days reading and researching the best i can so please don't flame me and tell me to go do a search. i just want to confirm what i have been reading and get direct input. here is what i have:

1968 C20 LWB with a 1972 c10 rearend and c10 conversion drop spindles on the front.

front end has 72 rotors and the rear has 72 drums.

i want to use Boss 338 wheels and i know there are issues with the fronts.

i am considering 20x8.5 fronts with 4.5 back spacing and then 20x10 rears with 5.25 back spacing.

these are my questions:

will this work?
will i have to grind the front hubs?
will the tires rub the rear?

currently running 17" wheels and want something to fill the wells better. here is a quick pic as we were loading it to head to the glass shop:

The front would look better with 5.25" BS.
Yes you will have to grind the rotors.
The 5.25" on the back would be a 6.25" BS wheel with a 1" spacer?
I prefer a 5.5" BS on a 10" wide wheel with the wider 71-72 1/2 ton rearend.

[Andy4639]

The grinding on my 71 took about 5 minutes per side. It's just enough off to get the wheel center cap to fit right so it doesn't bind. I have 8.5" up front with 10" out back. No spacer up front the wheel fit's fine with out the center cap. I used a 1/4" spacer on the back with deep thread lug nuts.