Panhard Rod

Submitted: Tuesday, Mar 21, 2006 at 14:12
ThreadID: 31985 Views:2177 Replies:2 FollowUps:15
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A mate noticed my rear diff off centre on the LC 80. Recently had new shockies, springs and BFG's put on. It looks as though the rear wheels are both about an inch to the right when looking at it from the rear. The front wheels look fine and in centre.

I'm now wondering if I should get an adjustable panhard rod put in. The vehicle drives well and I don't feel it wanting to crab alond when driving.

Does anyone know if it is absolutely necessary to get the adjustable rod put in? Will it cause any long term damage to components if I don't?

Thanks in advance.
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Reply By: Truckster (Vic) - Tuesday, Mar 21, 2006 at 16:00

Tuesday, Mar 21, 2006 at 16:00
Was it a lift kit?? If so how much? that would be the only real reason that it would be off center.

If you didnt lift it, i would be looking for the cause of it. It could be a bent panhard.
AnswerID: 161942

Follow Up By: Damien - Tuesday, Mar 21, 2006 at 16:16

Tuesday, Mar 21, 2006 at 16:16
Hi Truckster

Put in a set of XJS shocks and springs. I needed a little more lift in the rear so it sits better when loaded so I also got some 30mm spacers put it.

Do you think the spacers could have an effect?

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FollowupID: 416582

Follow Up By: Member - Roachie (SA) - Tuesday, Mar 21, 2006 at 16:33

Tuesday, Mar 21, 2006 at 16:33
Damien,
You didn't really answer Truckster question....the new springs (and shocks)....how much higher does it sit now as opposed to where it sat before you had them fitted? The more you lift it (whether with springs or spacers), the more exaggerated the offset will be. Up to about 3 inches lift should not need an adjustable panhard rod. My Patrol has 5" springs in the back (but it only sits about 3" higher cos of all the weight I've got in my lard-@rse) and it is okay without any change to Panhard.
If you add spacers, the off-set will be futher exaggerated.
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FollowupID: 416584

Follow Up By: Truckster (Vic) - Tuesday, Mar 21, 2006 at 16:40

Tuesday, Mar 21, 2006 at 16:40
Basically if you have lifted say 3-4inches with springs+ the spacers, you will have moved it enough to have moved the diff off center.

also try www.lcool.org
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FollowupID: 416587

Follow Up By: Damien - Tuesday, Mar 21, 2006 at 16:44

Tuesday, Mar 21, 2006 at 16:44
Its weird because I've only received about 50mm lift but that was all I was after anyway.

Maybe the 50mm then 30mm spacer did cause to go off centre.
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FollowupID: 416590

Follow Up By: Truckster (Vic) - Tuesday, Mar 21, 2006 at 16:48

Tuesday, Mar 21, 2006 at 16:48
So roughly 3inches, which shouldnt really affect it that much - wheres Dozer when ya need him... COME ON ANDREW!

Have you looked for any sign of damage or a bend in the current panhard rod?
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FollowupID: 416592

Follow Up By: Damien - Tuesday, Mar 21, 2006 at 16:53

Tuesday, Mar 21, 2006 at 16:53
No. Nil damage Truckster. Do you reckon the local Bob Jane or similar could help me out?
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FollowupID: 416595

Follow Up By: Truckster (Vic) - Tuesday, Mar 21, 2006 at 17:04

Tuesday, Mar 21, 2006 at 17:04
You probably could use a place like Truck Align, where in aussie are you?
or find some sand, thats smooth, and drive across it, see if front and rear wheels track in same marks :) Im cheap sometimes ;)
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FollowupID: 416597

Follow Up By: Damien - Tuesday, Mar 21, 2006 at 17:10

Tuesday, Mar 21, 2006 at 17:10
Cheap is good. I'm being a bit tight myself as we are heading up to the Cape in April.

I'm in Sydney.
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FollowupID: 416601

Follow Up By: 3.0turbob - Wednesday, Mar 22, 2006 at 12:34

Wednesday, Mar 22, 2006 at 12:34
Why does a lift put the rear diff off centre?

Rob
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Follow Up By: Member - Roachie (SA) - Wednesday, Mar 22, 2006 at 14:06

Wednesday, Mar 22, 2006 at 14:06
Rob,
Rear end of Patrols and Cruisers work on the system known as "5 link"...meaning there are 5 points that connect the axle housing to the rest of the vehicle to locate it in the correct position. 4 of these are the upper and lower trailing arms (2 on either side)....they have the job of holding the axle in position instead of it twisting under the torque applied by the drive train. The 5th link is known as the panhard rod.
This is situated behind the axle and one end is connected to the chassis, whilst the other is on the opposite side's axle. It's job is to stop the axle from moving side to side...it holds it in it's correct transverse position.

Now, if/when you lift the truck, the effective centre of the axle is moved closer to the side where the chassis mount is located. Try to imagine for a moment, what would happen if you disconnected the shockers, brake hoses, drive shaft etc and slowly lifted the whole rear of the vehicle, with the axle only being held in place by the panhard rod......the axle/wheels would stay on the ground, but the distance (perpendicular) between the 2 mounting points would reduce significantly and the wheels would be VERY out of alignment.
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FollowupID: 416896

Follow Up By: Leroy - Wednesday, Mar 22, 2006 at 14:37

Wednesday, Mar 22, 2006 at 14:37
the diff is put off centre because the panhard is connected to one side of the diff and the other end is connected to the chasis approx inline with the other end of the diff. So when you lift the chasis.... are easier with a pic

diff

Leroy
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FollowupID: 416903

Follow Up By: 3.0turbob - Wednesday, Mar 22, 2006 at 15:11

Wednesday, Mar 22, 2006 at 15:11
AAHH, Now I understand, thanks very much Roachie & Leroy.
So an adjustable panhard rod would bring it back to centre..yes.
How would this then affect the alignment of the rear springs, top to bottom?

Rob
(I've had a 2" lift installed recently and noticed the rear axle out of alignment on the Patrol)
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FollowupID: 416910

Follow Up By: Leroy - Wednesday, Mar 22, 2006 at 15:23

Wednesday, Mar 22, 2006 at 15:23
adjustable panhards are threaded so you can adjust them until the diff is centred.
the alignment of the springs would be out. ie the spring mounts on the chasis and diff wouldn't line up, if you put in taller springs. I have OME 2" which is probably closer to 3" but all looks ok from behind.

Leroy
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FollowupID: 416915

Follow Up By: Truckster (Vic) - Thursday, Mar 23, 2006 at 21:21

Thursday, Mar 23, 2006 at 21:21
Whiteline adjustable panhards will set you back $250-300 each.

But Im not convinced that a 2inch lift will move it that far. I had 3inch on the GQ with no problems.
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FollowupID: 417296

Reply By: 120scruiser - Tuesday, Mar 21, 2006 at 17:46

Tuesday, Mar 21, 2006 at 17:46
The lifted springs and spacer will put it off about what you state.
Usually on a two inch lift you don't need an adjustable panhard but over that it is highly advisable.
If the panhard is not bent and the bushes are OK I would suggest an adjustable one.
Up to 2 inch lift you can see the rear off centre a bit but the front should be as well, a bit harder to spot though but it will be off.
I'm in Sydney if you want to take a drive and let me have a bo peep at it.
Just let me know.
Cheers
120scruiser
AnswerID: 161980

Follow Up By: Damien - Tuesday, Mar 21, 2006 at 18:05

Tuesday, Mar 21, 2006 at 18:05
Thanks 120scruiser.

I'll drop into Heasman on Saturday.
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FollowupID: 416614

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