backspacing help asap please

[bmph8er]

i have a 72 c10. i lowered it with belltech spindles so now i need wheels my front 15 inch wheels no longer fit. im ordering 17s b/c i can get free tires at work. the wheels im looking at are 17x8 with 5.25 backspace or 4.5 backspace, and for the rear 17x9 with 5 backspace or 6 backspace. since i have the 72 with the wider rear end i think i need more backspacing is that right? thanks

[bmph8er]

if anyone can help id be greatful. i need to get wheels ordered so my truck isnt sitting on jackstands in the middle of my garage. thanks

[lolife99]

I would run the 5" BS on the rear 17x9 wheels,... if that's your best option.
6" BS will be too much.
Up front a 5" BS would be better for your 17x8 wheels,... so I guess choose the 4.5" BS if you have to have these wheels.

I personally, would grind your lower a-arms so your 15" wheels would work.
You never know when you will have to install the spare or other 15" wheels.

[bmph8er]

The lower control arms isn't the problem. I ground them they clear fine. The wheel is rubbing on my caliper mount on the spindle. I never seen it happen before but it is. It's ok tho I wanted different wheels just wasn't ready yet. Oh well that's life thanks for the reply
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[bmph8er]

Forgot to put I have a 5/6 drop and will have 245/45r17 front 275/40r17 rear. Freebies from work
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[ChevLoRay]

I used a 4-inch BS up front and a 5-inch BS out back, on my '69. Front wheels are 8-inches wide, while rears are 10-inches wide.