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#1 |
Registered User
Join Date: Jan 2007
Location: Opdyke, IL
Posts: 775
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Adjustable panhard bar question
How much can the rear end be lowered before an adjustable panhard bar is needed? Also while I'm here, how low can the rear go before the shocks need to be relocated? Thanks
Jason
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1978 Chevrolet Silverado 3/4 ton 400 small block. 2000 F-250 Powerstroke 2002 GMC Yukon Denali XL |
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#2 |
senior member
Join Date: Feb 2003
Location: fort macleod alberta
Posts: 2,770
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Re: Adjustable panhard bar question
i believe that say anything lower than 5" needs an adjustable panhard bar
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69 GMC bagged |
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#3 |
sufficiently talented fool
![]() Join Date: Jun 2006
Location: Forest Hill, MD
Posts: 2,231
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Re: Adjustable panhard bar question
I have a 5" rear drop and was OK with the stock bar. I did however put an ECE super track bar kit on because of exhaust clearance issues.
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"it's impossible to be surrounded by idiots when you are part of the circle" ![]() 2003 Suburban 2002 Pontiac Montana 1981 Corvette 1966 Impala Convertible Click here to support the board |
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#4 |
Registered User
Join Date: Jan 2007
Location: Opdyke, IL
Posts: 775
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Re: Adjustable panhard bar question
Thanks. Anyone else? Also, what about the shock relocation?
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1978 Chevrolet Silverado 3/4 ton 400 small block. 2000 F-250 Powerstroke 2002 GMC Yukon Denali XL |
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#5 |
Registered User
![]() Join Date: Aug 2005
Location: Hillsboro Oregon
Posts: 6,449
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Re: Adjustable panhard bar question
I can't say exactly what the threshhold is for switching to an adjustable bar and relocators. 4-5" is what I've read. But I will say that those specs apply only to drop SPRINGS when it comes to relocators. If you use 2.5-3" lowering blocks plus 2-3" drop springs you do not get into that territory. In other words the blocks don't count in the calculation for determining when to switch to relocators because they don't change the shock geometry.
The bar IS affected by blocks however (until you switch to the ECE super track bar, in which case you're adjustable anyway ![]() If you do use blocks be sure they don't put anything such as the U-Bolt nuts below the rim line. 2.5" is what most people use. The bigger the rim, the bigger the block can be. |
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#6 |
"Trucks with Class"
![]() Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,132
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Re: Adjustable panhard bar question
About 2" on both...
More drop than that and the springs are getting offset and the shocks are losing effective angle. You can get away with running lower w/o changing those items, but the rearend will be sitting off to one side and the shocks will be worse than original. |
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#7 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Adjustable panhard bar question
every inch you lower with a stock bar you're offsetting the rear to the passenger side plain and simple geometry at work theres no magic that 4"is ok and at 5" its a magic number
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#8 |
Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Adjustable panhard bar question
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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#9 |
Registered User
Join Date: Apr 2007
Location: Vegas
Posts: 225
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Re: Adjustable panhard bar question
I might be wrong here but i fail to see why blocks wouldnt effect the bar? One end is on the frame and the other on the rear end, a 5" drop no matter how it is achieved will move the rear closer to the frame which will effect the bar. only diff is you have longer springs and shocks because the trailing arms dont move as much.
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Mike 1972 LT1/4l60e Short Bed ART Front and Rear Strong Arms http://www.67-72chevytrucks.com/vboa...50#post2151750 |
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#10 |
Registered User
Join Date: Jan 2007
Location: Opdyke, IL
Posts: 775
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Re: Adjustable panhard bar question
Thanks. Gives me more to think about.
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1978 Chevrolet Silverado 3/4 ton 400 small block. 2000 F-250 Powerstroke 2002 GMC Yukon Denali XL |
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#11 | |
Commander Taco Bello
Join Date: Sep 2006
Location: Des Moines, Iowa
Posts: 2,232
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Re: Adjustable panhard bar question
Quote:
for the factory panhard, if you just put blocks in, you're lowering the T arm, which is where the coils mount. so in that case, i would think your rear would still shift to the P side of the truck. the distance from the top of the rear end to the frame isn't changing as much as if you were to use drop coils, but it's still getting adjusted.... that clear as mud? ![]() |
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#12 |
Registered User
Join Date: Sep 2006
Location: colorado springs colorado
Posts: 737
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Re: Adjustable panhard bar question
Just curious if anyone knows the length of the super track bar? From eyelet to eyelet.
sorry for the hyjack Frank
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70 chevy lwb c10 454/th400 and a 9" rearend suicide doors, marker light fuel fill, 4" cowl , mini tub |
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#13 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Adjustable panhard bar question
I`ve never lowered an inch or two.I agree with Pickmup.If I was lowering a truck(and I wouldn`t bother with an inch or two)I would figure on an adjustable bar.Just because when I alter a vehicles design I will do what it takes to compensate and keep it as close to correct geometry as possible.On shock locators.I always made those and made them to give the same angle as original.The more it`s dropped,the relocation point changes.
The idea is to restore proper alignment to as close to original design as possible for the best possible handling.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#14 | |
Registered User
Join Date: Apr 2007
Location: Vegas
Posts: 225
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Re: Adjustable panhard bar question
Quote:
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Mike 1972 LT1/4l60e Short Bed ART Front and Rear Strong Arms http://www.67-72chevytrucks.com/vboa...50#post2151750 |
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#15 |
Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: Adjustable panhard bar question
It is adjustable. I can't find the lengths of it fully collapsed/fully expanded.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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#16 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Adjustable panhard bar question
I have ECE 2.5/4.0 suspension drops on my '69, and DJM 2.0/ 4.0 on my '96. The '69 has coil springs in the rear. I have the adjustable track bar AND the shock relocators. This truck rides and drives like bein' downtown wherever I go. As for the '96, it has leaf springs, no shock relocators and rides like crap. I blamed in on the 20's. Replace them with the 15x8's that had been on it. No improvement. It had ToxicShocks on all four corners. Replaced the rears with MonroeMatics. Much better. I have asked DJM about shock relocation and they say it is only matters on bagged vehicles. I am ready to try them on the '96. It can't hurt.
But for dropping the rearend, you need to keep the rear axle ass'y centered under the chassis. Whether that means that you have to alter the original and reweld it to the correct length or install an adjustable, you should consider it necessary. ECE wouldn't have gone to the trouble to develope the part it they didn't consider it worthwhile to have and install. With leaf springs, it is a non-issue as there is no Panhard rod. But I'm still gonna get the shock relocators.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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