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crank up t-bars....what about the rear?

1.9K views 40 replies 6 participants last post by  AJMBLAZER  
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#1 ·
Hey when I get my truck back i'm gonna crank up the Tbars a little. What do I do to the back to compensate a little??

-Ryan S- 1994 Chevy Silverado Z-71 Two-Tone Navy/Silver, 285/75/16 BFG Mud Terrains. Custom Flowmaster Dual Exhaust. K&N system. Custom Kenwood/Rockford Fosgate system, two 12" Rockford HE subs.
 
#2 ·
get a 1" ada leaf, AJM likes the zero rate leafs that give you about an inch of lift.

but you can probably go to anytire shop and pic a set up for 50 bucks or so and theyll also give you about 1" and increase your load careing capcity too, and may make your truck ride just a nough rougher to notice,

sometime this week Im throwing a set of 3/4 ton leafs with overloads on mine, I should gain a lot of load capcity and 1" of lift since 3/4 ton leafs have one more leaf than my 6lug 3/4.

IF ITS GOT WHEELS OR A SKIRT YOU CANT AFFORD IT
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#3 ·
Does your truck sit nose low right now? Our trucks came from the factory that way, so if it sits level now, I'd think someone has already cranked the torsions a little. You might want to check on that.

Still, if your truck is a little bit high on the front, I like the http://www.OffRoadDesign.com 1" zero rate add a leaves that I have. You can read a write up and install at http://www.coloradok5.com/ordaddaleafreview.shtml about them. Good stuff. 1" of height gain with none of the side affects of an old fashioned add a leaf. Doesn't up your load rating any, but your ride and flex stay the same.

1992 Blazer Sport, 350 TBI, 4L60, 3" Flowmaster, K&N, MSD coil & wires, Rancho 2.5" lift, 285/75R16 AT's/wwwthreads_images/icons/laugh.gif
 
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#4 ·
Tightening your torsion effects your allignment. If your not worried about screwing with the camber then go for it. You will cause premature wear on the outside edges of your tires and your steering wont act the same. Many guys talk about doing this but it doesn't make sense.
Joe

 
#7 ·
the tires will tilt in at the top wearing the inside edge,

1/2" of lift wont affect things a hole lot but any more and you can see the dif in camber, at least I can

And no cranking the t-bars wont wear the outside edge of the tire it will wear the inside edge. lowering the bars to much would wear the outside edge, I guess thats kinda trivial thought either way it will wear prematruley.

IF ITS GOT WHEELS OR A SKIRT YOU CANT AFFORD IT
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#8 ·
kid, i'm going to have to disagree with you on that /wwwthreads_images/icons/blush.gif cranking the bars too much will make the tires sit like this ----> \''''/

...the bottom of the tires are pointed in...

Shorts <-- its not what you think...and don't ask what it is /wwwthreads_images/icons/smile.gif
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#9 ·
no, the the tires are in like this: /\ when you crank the torsion bars, and like this: \/ when you lower them. if you were to go do this right now to your truck, that is what it would look like. not trying to show you up or anything, its just that i am always lowering and raising the front end because of my stupid 2"-3" rough country lift.


 
#10 ·
no way.... they're the way I SAID IT! /wwwthreads_images/icons/mad.gif /wwwthreads_images/icons/shocked.gif /wwwthreads_images/icons/tongue.gif

mine when 'bottom in' when i cranked them up....so, beats me...maybe mines broken???? /wwwthreads_images/icons/crazy.gif

Shorts <-- its not what you think...and don't ask what it is /wwwthreads_images/icons/smile.gif
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#11 ·
You are all missing the point/wwwthreads_images/icons/crazy.gif
You only want to crank the T-bars enough to level out the truck. They are NOT a substitute lift kit
If you have raised the front soo much that you now need to lift the rear... the solution is relax the front t-bars some!
I have always endorsed using the t-bar crank to lift the front end to level out the truck.
But if you are turning it up over-level you ARE asking for front end damage/wwwthreads_images/icons/mad.gif

Scooby Dooby Doo !!!
 
#12 ·
scoob thats true but the fronts sit lower than the back so that when the truck has a load on it will sit level with the front enstead of the rear being way lower than the front because of a load of sheet rock or something.

I want mine an 1-1.5"s higher in the back only because my trucks takes on a heavy load pretty reg, but if the truck doesnt do much hauleing or only does light hauling then the rear sitting level with the back would be fine

IF ITS GOT WHEELS OR A SKIRT YOU CANT AFFORD IT
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#13 ·
I see...that makes sense/wwwthreads_images/icons/smile.gif

I have a 1 ton so it NEVER sags in the rear!/wwwthreads_images/icons/smile.gif
I took some pics about a week ago of my truck with nearly 2.5 ton of 3/4" landscape rock in it!
There was some sag from that!/wwwthreads_images/icons/laugh.gifI will post the pics soon.

Scooby Dooby Doo !!!
 
#14 ·
scoob,
If I was to buy another truck Id definatly get 3/4 8lug or one ton, my truck just sags to much with any farely good sized load on it, but Im getting overloads to hopefully help that, Ill be lookn forward to your pics

Shorts,
maybe this will make sense, when the bars a cranked the bottom control arm pulls the suspension down, thus pulling the top control arm down. that would also pull it closer to the frame because it cant go straigh down it pivots and causes the tires to lean into because its compensating for the bars being cranked.
does this make any sense?

The Kid

IF ITS GOT WHEELS OR A SKIRT YOU CANT AFFORD IT
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#17 ·
AS YOU RAISE THE FRAME OF THE TRUCK, THE UPPER CONTROL ARMS GO WITH IT, CAUSING THEM TO PULL IN, THIS PULLS THE TOP OF THE TIRE IN, MAKING THEM LIKE THIS / \. WHEN YOU LOWER THE FRAME, IT LOWERS THE UPPER CONTROL ARMS PUSHING THEM OUT, WHICH PUSHES THE TOP OF THE TIRE OUT, CAUSING THEM TO LOOK LIKE THIS \/. YOU DON'T EVEN HAVE TO PERFORM THE PROCEDURE TO REALIZE THIS. AND MAYBE YOURS IS BROKEN IF IT DOESN'T DO IT. BUT THEN IT IS THE ONLY CHEVY THAT DOES THIS IN THE COUNTRY.

 
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#18 ·
Not necessarily...My brother-in-law torsion bar cranked his 89' to fit 33's and when he returned it to stock setting the tire on one side sat out \--|. The cranking wore out components and threw off the camber or something like that

- Rick -
98' GMC X-Cab Z-71 w/ 2" Body Lift, 33 x 12.50 BFG MT's on 15 x 8 Eagle 054 Gambler Rims, Custom exhaust & stereo.
 
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#19 ·
I have to agree with sk4004.

Normally, when cranking the torsion bars to raise the front end the bottom of the tires will point out like this..../ \. I have personally witnessed this on a couple of trucks when the bars were cranked up too far. Another way to see this is to jack the front of the truck up by the frame or bumper (letting the front suspension droop down).

The reason this happens is that the upper control arms are shorter than the bottom arms. When the tire is forced down (for example when cranking the bars), both the upper and lower arms are forced down also. Since the upper arms is shorter it travels in a smaller arc, meaning it will pull the top of the knuckle in towards the frame more than the bottom arm will.....thus meaning the top of the tire will be slanted in towards the frame giving this shape "/ \".

6.2Blazer
 
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#20 ·
I'm not doubting the fact of tires being /--\. I'm just saying that upon lowing back to stock height things don't always return the way the were, ergo slanting outward like turning them too far down.

- Rick -
98' GMC X-Cab Z-71 w/ 2" Body Lift, 33 x 12.50 BFG MT's on 15 x 8 Eagle 054 Gambler Rims, Custom exhaust & stereo.
 
#21 ·
6.2 Blazer, that was a pretty good illustration there /wwwthreads_images/icons/cool.gif

i'm still not 100% convinced, but i'll go crank up the truck this afternoon /wwwthreads_images/icons/crazy.gif since i'm probably not smart enough to realize this without performing the procedure, i do want to see for sure... and give props, of course /wwwthreads_images/icons/smile.gif

sk4004, i'm not trying to make this a pissin' contest....you'd win hands down /wwwthreads_images/icons/blush.gif

Shorts <-- its not what you think...and don't ask what it is /wwwthreads_images/icons/smile.gif
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#25 · (Edited)
i was still thinking.... /wwwthreads_images/icons/crazy.gif even though the lower control arms are being pulled down from the frame, they're being twisted by the tbar so they're not being pulled perpendicular to the frame....they're being pulled back underneath. i've seen many trucks around here with overcranked tbars and \/ lookin' tires. anyway, these are my tires with the tbars level...i haven't cranked them to the max yet for my little experiment...i haven't had much time to mess with my truck do to other commitments /wwwthreads_images/icons/blush.gif

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Shorts <-- its not what you think...and don't ask what it is /wwwthreads_images/icons/smile.gif
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#26 ·
I don't mean to sound like an a$s but hasn't anyone seen a VW bug or a sandrail that has the rear cranked to the max for clearance in the dunes? They definately do this \' '/ We have a (not the same but similar) system in the front of our trucks Lowered "G" rides do this /''\. Instead of cranking your T-bars just go get the shop jack and see it for your self.