Purchased a lift kit with just shocks and springs, no control arms. Do i need to purchase all 8 control arms? just the rear and front lowers? Front lowers and rear uppers?

 

need to know what lift you bought? What lift height?

 

^^^^
What he said.
The progression is cheap lift, no arms
Better lift, all four lowers,
Then all eight arms.
There's other options, but you can get by with just springs on a 2.5 lift, anything more you need more. Even on a 2" lift, arms and both track bars will make you happier. Jmo.

 

What you 'need' will depend on your build and your budget and your opinion.

Upper and lower do basically the same thing. If you only get one set up front, you would either lengthen the lower, or shorten the upper, to raise the caster. If you only got one set for the rear, you would either lengthen the upper, or shorten the lower, to raise the pinion.

The second set of arms for either end allows you to fine tune, and to move the entire axle forward/backward in the wheel well.

Uppers may be a bit less expensive. Lowers are beefier than stock, which may be a good thing if you plan on smacking them on rocks. Extending an adjustable arm may give a bit more adjustablity over shortening. Extending may also give a minute amount of added wheelbase.

General consensus is that lowers are the better option if you only get one set up front. For the rear, some vote for uppers for the better adjustability, some vote for lowers for the added beefiness.

 

I got a 3.5 inch skyjacker with 35s

 

I also have to skyjacker 2.5 on my Sahara with 295/70/18's, love it....

 

Need an alignment and a visual on wheelbase. Did right though just buying the coils and shocks to start. Might be okay using fixed length. Definitely have more work in front of you.