im sorry ive searched endlessly and now im more confused i want to put some 17x9.5 rims that fit 4th gens on my 85. do i need a 2 in or 2,5 in spacer i hear both which is safest and looks best thanks... i promise i searched lol

WHICH 4th gen rims? They aren't all the same.

http://www.skulte.com/adapterfaq.html

here is a link to the rims http://www.oewheelsllc.com/Camaro-Wh...02383-3-1.html

Find out what the offset is & the link I already gave you, should tell you what you need.

ok that page says 54 mm offset is 2.25 in spacer... thanks thats bookmarked now

I know it says 2.25" adapters, but would 2" adapters work? What would be the widest size tire for the rear...275?

2" adapters are what are usually used, just to get all 4 the same sized & they can go anywhere.

As for tire size....On what wheel? On what rear axle? You willing to do any mods to make what you want fit?

The car is lowered and I'm using the stock 9-bolt rearend in the car for now until I can afford the swap to a 12-bolt. I'll be using the same wheels purple posted the link for a few posts up.

Depends on your sway bar up front. I have to run a 2.1/4" because of a crappy sway bar in the front, The rear you may have to measure because I have a 4th gen rear and 54mm fits perfect.
4th gen axles are 1 11/16" longer than 3rd gen axles. Right off of Summit using Moser direct fit axles.

4th gen
http://www.summitracing.com/parts/MSR-A102805/

3rd gen
http://www.summitracing.com/parts/MSR-A102604/

4th gen axles are 32" and 3rd gen axles are 30.313"(30 5/16")

If it's a 9 bolt then it's a different animal. They have different axle lengths on each side

Thanks for the input.