Which springs for ARB Bumper?

Sorry if I'm beating a dead horse, but I just sold my built first gen Tundra to pick up a Tacoma and I'm trying to relearn everything for this truck.

I currently has 5100's on all 4 corners with an AAl in the rear, just bought an ARB bumper. How badly are the stock springs going to sag if I keep the stock spring in? What if I just bumped the 5100's up another notch?

The truck is 4x4 with the V6

 

I'm on 600lb springs and I have no sag. Then again I'm a Prerunner so if you're 4x4, you'll have more weight due to your diff and axles.

I've also got armor so overall my truck is pretty heavy.

 

883s all day. I was running 883s with the same setup. 3/4 in lower in front with Dakar’s after spring break in

 

That's gonna look good dude, I love that topper, dont see many like that. I plan on going with the ARB bumper in a few months. Post some pics when its on!

 

**Edit**
The reason why I'd like to keep my stock springs is because I will be upgrading to a set of Fox's in the future. I'd rather run my 5100's for a while unless the truck is going to have a bunch of sag.

 

I've read conflicting numbers between 540 to 560 on the stock springs.

Adding more preload though will make the ride feel very stiff.

 

Just put the 5100s on the top notch. Winch and bumper aren’t that heavy. About the same as a passenger less than 200lbs total

 

That's the answer I wanted to hear haha. Trying to see if anyone is running the same setup as me with an arb.

 

With that bumper I’m gonna second the OME 883’s.