Dont know why but the body on pic didnt upload.

Robb

black spacer is suppose to be the same size , but with the extra flash it comes with ?
The fit is tighter than the white .

Then the white plastic is also a Teflon base so it is smoother than the black plastic ...

is there a problem with the spring rubbing the rear turnbuckle?

If you have switched to the plastic hubs from the B44, you wont need to change the crush tubes.

If you are running the plastic hubs from the original b4 (outer bearing is small) then yes you need a different crush tube as nhraman linked below.

Whichever you are using, if there is a grinding sound, check that the bearings themselves arent damaged and that you have the correct tube installed.

Ray

What is the advantage of the Big Bore springs?

Overall better stability and softer landing on jumps, its really helpful at wcrc, I see you live in so cal I just am not sire if you go there

Does it create more dampening? like a stiffer shock?

No. Changing pistons and oil weight changes dampening..

Well then what does a softer landing mean?

Suspension set up is something that can take a long time to get your head round..Just look at the last 100 pages of endless chat about BB springs.. Springs control your ride height.. if you fine you are bottoming out off jumps, go to a harder spring.. If your car is miles off the ground and you run on say the street, or a smooth track then you can get away with a softer spring..

I just re-read your question. And if you are after a harder shock, a harder spring will do that, as it takes more energy to compress that spring.. Dampening on the other hand controls the speed at which the shock moves..

Right now I have the green Associated spring in the rear. The shock collar is all the way up against the cap to get a decent ride height. If I go to a stiffer spring it will raise it up. How would I get a good right height after I put a stiffer spring in it?

No i agree... its all part of learning what does what and can make you a capable tuner. But there are people that will get so caught up with trying the 'in' thing, they never really focus on driving the 'damn' thing.

In offroad, track changes are usually so frequent within the day that pack placement and individual weight placement becomes something you think about on the car ride home. "I wonder if that would have made it better if..."

You have to be a seasoned racer that turns A LOT of laps to be able to look at the track and know if moving the pack around makes a positive difference for you. IMO, i like as much battery in the car as i can get. The heavier it is, the harder i can push it...

Same.. If i run a silver spring with the weight of my buggy it sits at 27-28mm..With the greens it sits at 24mm.. If i need to run the silver springs i go to the out side hole on the rear tower and i get back to 24mm in the rear..

The manual is wrong for 13.5 and 17.5. I figured this out just in the last couple of days. Look at the FDR listed. It doesn't match.

with 13.5 I went up to 28/75 and it was a huge difference. I would think 17.5 would be go up a couple teeth from my 13.5 gear.