RC 2" Level w/ 275/70-R18 w/ stock rims

[delmandi]

This is my first GM truck and am just trying to verify that these tires will fit with a RC 2" level kit (possilby putting 2" blocks in the rear as well to keep a little rake)

Here are the tires I will be putting on.

http://www.discounttire.com/dtcs/findTireDetail.do?ra=filterTireProducts.do&fl=&tc=COPVL0&c=5&rcz=78028&pc=15949&ar=70&rf=true&rd=18&rc=TSKINT&cs=275

 

I did a lot of reading on here and have seen mixed opinions and have seen the majority of people getting aftermaket rims. I want to keep my stock 18's and just go up in tire size.

Also, does anyone know if the stock shocks will be able to handle 2" blocks in the rear? Thanks.

 

 

[RyanbabZ71]

I have a 2010 with this setup and 3" rear blocks. No issues at all

 

 

Ryan

[delmandi]

Awesome! Thanks.

[DanielAcosta]

This is my first GM truck and am just trying to verify that these tires will fit with a RC 2" level kit (possilby putting 2" blocks in the rear as well to keep a little rake)

Here are the tires I will be putting on.

http://www.discounttire.com/dtcs/findTireDetail.do?ra=filterTireProducts.do&fl=&tc=COPVL0&c=5&rcz=78028&pc=15949&ar=70&rf=true&rd=18&rc=TSKINT&cs=275

 

I did a lot of reading on here and have seen mixed opinions and have seen the majority of people getting aftermaket rims. I want to keep my stock 18's and just go up in tire size.

Also, does anyone know if the stock shocks will be able to handle 2" blocks in the rear? Thanks.

WIth 2" blocks It is better to make the minimal investment to get longer travel shocks. Otherwise, on large bumps the stock shocks will top out in travel and your tires will lose contact with ground.

[delmandi]

WIth 2" blocks It is better to make the minimal investment to get longer travel shocks. Otherwise, on large bumps the stock shocks will top out in travel and your tires will lose contact with ground.

 

 

 

I thought about that, I really wanted to go with the Bilstein 5100 ride height selectable for the front and 5100's in the rear but they said they wont be out for 6 months! I still may order some extended 5100's for the rear.

 

 

 

 

 

Dont you have the hypertech speedo calibrator? Will that leave any imprint on the computer for warranty purposes?

[DanielAcosta]

I recently had the a bunch of ECM/TCM/BCM updates done. I took out the Hypertech program before going in, and nothing showed up. After they were done, I reinstalled the Hypertech right there in the service drive. I talked to the service manager and the shop foreman before buying the Hypertech and they both said there would be no warranty issues. Keep in mind I only did the speedometer cal for oversize tires, not the additional tuning options. If anything the truck shifts up sooner and engages AFM more after the Hypertech, so it improves the drivability.

The dealer actually tried programming my ECM for free before I bought the Hypertech, but they were limited to tire sizes that are offered by GM. Their tune only eliminated 2% of my 8% error, so I went ahead and bought the Hypertech to zero out the error. Right now my odometer is off by 0.3 miles per 100 miles, which is about as good as it gets. Hypertech allows adjustments in 1/4-inch increments; when I tried the next size, the error was 0.8 miles per 100 miles in the opposite direction, so I definitely have it tuned as precisely as possible.

BTW, I found my best results from entering the tire size compressed on the vehicle as opposed to unladen. So while my tires are 34 inches off the vehicle, they measure 33 inches installed with the bottom compressed, and 33 inches is the Hypertech entry that gave the best results.

[delmandi]

 

I recently had the a bunch of ECM/TCM/BCM updates done. I took out the Hypertech program before going in, and nothing showed up. After they were done, I reinstalled the Hypertech right there in the service drive. I talked to the service manager and the shop foreman before buying the Hypertech and they both said there would be no warranty issues. Keep in mind I only did the speedometer cal for oversize tires, not the additional tuning options. If anything the truck shifts up sooner and engages AFM more after the Hypertech, so it improves the drivability.

The dealer actually tried programming my ECM for free before I bought the Hypertech, but they were limited to tire sizes that are offered by GM. Their tune only eliminated 2% of my 8% error, so I went ahead and bought the Hypertech to zero out the error. Right now my odometer is off by 0.3 miles per 100 miles, which is about as good as it gets. Hypertech allows adjustments in 1/4-inch increments; when I tried the next size, the error was 0.8 miles per 100 miles in the opposite direction, so I definitely have it tuned as precisely as possible.

BTW, I found my best results from entering the tire size compressed on the vehicle as opposed to unladen. So while my tires are 34 inches off the vehicle, they measure 33 inches installed with the bottom compressed, and 33 inches is the Hypertech entry that gave the best results.

Great, thanks for the good info, I will probably go the hyper tech route as I don't see the need for any other tuning at this point.

[delmandi]

I ordered the RC 2.5" kit in case I needed/wanted more rake and ended up only using the bottom strut spacer. It looks great! ended up getting BFG All Terrain KO's, 275/70r18's, the local sears threw up a price I couldn't refuse! I have had these tires on two other trucks and really enjoy them with the exception of picking up rocks and letting them go at freeway speeds. I may install the rear blocks later, I'm going to see how bad it sits with a load first. The ride quality is a little stiffer with the level kit and new tires, but not bad, I will be getting in line to get 5100's when they come out or look into dropping some $$ for some ICON vehicle dynamic coil overs. I will post some pics as soon as I get some better light, here is one for now.

 

IMG_2358 by , on Flickr

[14WhiteZ71]

I ordered the RC 2.5" kit in casr I needed/wanted more rake and ended up only using the bottom strut spacer.

Wouldn't be interested in selling that upper spacer would you?

 

[delmandi]

Sure hit me up on Sunday, we're out of town till then

[14WhiteZ71]

Sent you a message about the top spacer ^^^ I put the 2" RC kit on mine and it brought the front up from 36 1/4" to 38". Still 1 1/4" lower than rear. I wouldn't mind seeing what that top spacer adds to it.