I currently have a 3" block in the rear with 35s and I was thinking a 4" would do. Does that sound right or should I step up to a 5" block?

I need to contact Bilstein and give them my rear shock part number so that they can verify what range of lift the shocks were intended for.

Also, I have shimmed the carrier bearing for the 3" blocks, will I have to shim it some more for a 4" or 5" block?

Anything else I'll need to do since moving to a bigger block?

Depends on the look (rake angle) you want to achieve. I assume with 37s you have at least 8 inches of lift which means 6 inch deavers plus 1 inch block or just the deavers or just a 6 inch block... I would go with new springs in any case, not a block!

Generally most trucks sit 2 inches higher in the rear so to sit level you need a 2 inch smaller block or springs, but springs are seldom their advertised hight (lower) and you might to add a small block additionally.

Just my 2c :)

That is going to be a big block.........I would do the Deaver springs.

mahalkita, way off, lol. Right now I have 20" wheels on 37" tall tires. I have 4" spindles in the front and 3" blocks in the rear. I'm sure I could get away with 37s by simply adding a 1" taller block, but I just wanted to be sure. I definitely don't need anything bigger than 5".

A 4" block will work just fine.

You ever thought about buying leaf springs... Thats a big Block!

A 4" or 5" block is considered big?

If I considered leaf springs, the only brand that I ever hear of is Deaver. If I went that route, I would have to install airbags wouldn't I? I hear the Deavers give you the lift, but are a softer spring, not giving you the capacity.

they will squat more. Deaver does make a 6 inch 1ton leaf though.

A 4" block is not too big, and I believe it will work fine. I used to have a 5.5" block which is considered too big if you tow or anything. It had plenty of room! So, I'm sure a 4" would be plenty.
Also, you don't HAVE to get airbags with Deavers. I have them now and they are a softer spring but they can still support a pretty decent load.

Jeremy

I have a 6" Superlift kit that uses a 4" rear block and I run 37's with no problem. Even did my first truck pull with it last night, but I blocked the rear so it only had 2" travel. Didn't wanna eat my rear fenders.:cool:

Truck pull video in Sled pulling section...

Cheers:beerchug:
Mike

I don't want to make the rear stiffer than what it is, so if that's what the 1 ton leaf does, then I'll pass. Honestly, I used to tow my race car, but that's long gone now. I really don't haul or pull anything, but if I ever needed to help someone out, I would want to have full capability.

A 4" block is much cheaper than 4" Deaver springs, so I can always give that a shot. Plus, most 6" lift kits out there supply between a 4-5" block in their kits.

MadMaxMike, you definitely proved that you can run 37s with a 4" block, however, it looks like such a tight fit. Do you have any rubbing issues front or rear? Did the kit lift the front a full 6"? I have rubbing issues now, but then again my 20x10 wheels have -18mm offset which have the wheels and tires sticking out quite a bit.

MadMaxMike, you definitely proved that you can run 37s with a 4" block, however, it looks like such a tight fit. Do you have any rubbing issues front or rear? Did the kit lift the front a full 6"? I have rubbing issues now, but then again my 20x10 wheels have -18mm offset which have the wheels and tires sticking out quite a bit.
The only rubbing I have is full lock to lock, it will rub the sway bar mildly on the insides and it's a "soft" rub. As in is doesn't grind or cut into anything, it's just the bulge on the sidewalls thats slightly rubs the sway bar. If I'm trying to pull into a parking spot where someone with a normal size SUV wouldnt even pull into is the only time I get any rub at all.

Then again, I'm running 37's on H2's and have pretty accurate backspacking for this combo. My next set will be 18's or 20's wrapped in 37's more or less and I'm gonna try and copy this backspacing close as i can.