Duramax Diesels Forum Truck of the Week
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Old 05-31-2017, 09:31 PM
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Default Stupid question

Here's my stupid question. Like my name, because I "don't know"!
I have 305/55R20's on 20x9 with 0 offset and a 3" torsion bar leveler kit. Front seems to hit really hard on the smallest crack in the road. Any suggestions? Also do you suggest matching the spare to the same size or am I OK with my 17" stock spare. I also did just put some Firestone Ride-Rite airbags in rear to correct sag and help with trailer loads. Thanks for your help.
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Old 05-31-2017, 09:46 PM
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You have longer shocks? And aftermarket upper control arms?
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Old 05-31-2017, 09:47 PM
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Hey buddy, I believe your issue is the offset. Stock rims are 17x8 and +12 offset(don't quote me) so with the 0 offset and a wider rim you have a wider stance now and throwing on those 305's you're gonna rub. LMM don't have a lot of clearance to begin with and will require some shaving on the bumper caps, liner and probably a fender mod if you want wider and taller.
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Old 05-31-2017, 09:55 PM
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Yes hyjackers for 3" lift but no new control arms. And no I don't have any rub now but did have to trim liner in front for rub when in sharp reverse turn.
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Old 05-31-2017, 10:00 PM
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Your upper control arms are bottoming out
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Old 05-31-2017, 10:10 PM
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Quote:
Originally Posted by gmduramax View Post
Your upper control arms are bottoming out
Thank you, I'll have to check that out. Now if I change upper control arms, will there be more to change. So far it has seemed like a chain of events, one leading to another.

How about the spare, any suggestions.
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Old 05-31-2017, 10:16 PM
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The upper control arm, am I looking for a different size. Seems like I would be, but like I said, "stupid question "
Thanks again
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Old 06-01-2017, 12:31 AM
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An aftermarket control arm like Cognito will allow for 28% more down travel than your factory arm. If you are a true 3" lift with keys and shocks, I'm guessing your CV angles are pretty crazy. Without the down travel of an aftermarket arm, you are limiting yourself causing a harsh ride. Check to see if any site vendors are Cognito dealers, if not lmk.
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Old 06-01-2017, 06:33 AM
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Wheel size of your spare shouldn't matter....not like you're gonna drive 1000's of miles on it. I'd be more concerned that the overall tire height of the spare is close to what you have on the truck now.
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Old 06-01-2017, 07:26 AM
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Quote:
Originally Posted by RPM Motorsports View Post
An aftermarket control arm like Cognito will allow for 28% more down travel than your factory arm. If you are a true 3" lift with keys and shocks, I'm guessing your CV angles are pretty crazy. Without the down travel of an aftermarket arm, you are limiting yourself causing a harsh ride. Check to see if any site vendors are Cognito dealers, if not lmk.
even still, if he has truely cranked it up 3", adding cognito arms wont help much.


OP, its time you start looking for an actual lift kit that drops the diff and control arms OR you put smaller tires on and de-crank the front end to 2" or less and put cognito control arms on.

driving at it is now is only going to destroy ball joints and steering parts in short order
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Old 06-01-2017, 07:27 AM
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Agreed with Chevy1925. Leveling kits are junk. But a good 4 inch kit and drop your torsion bars all the way
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Old 06-01-2017, 08:14 AM
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Sure wish I had researched more before I did all this. One thing to another
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Old 06-01-2017, 09:57 PM
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Totally agree with James. If you are more than 26" center of hub to top of the wheel well, you either need to crank down to 26" or less..., or invest in a 4" package. The only way to keep everything within factory specs, and keep a nice ride would be go 4".
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