Redesigned series shocker mounts.

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Originally Posted by grey_ghost

why do some 4WD’s have one shock mounted in front of the rear axle and one mounted behind.

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The classic Range Rover has that set up - thought it was to do with reducing the effect of axle tramp.

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Originally Posted by workingonit

The classic Range Rover has that set up - thought it was to do with reducing the effect of axle tramp.

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??

RRC, as with the D1, both rear shockers are forward of the axle set with a slight angle.

Exactly - axle tramp is loss of grip due to the axle rhythmically twisting from torque reaction which is released when a wheel loses grip, in turn reducing torque allowing the axle to twist back, with this then repeated rapidly as the wheel regains grip. Having one in front and the other behind damps this motion, as the twisting moves the dampers.

Leading and trailing dampers are more common on leaf spring vehicles to control axle wrap
The rotational plane of movement
(My understanding of axle tramp was an unconstrained up and down cycling that helps develop corrugations!)

Coilers with upper and lower links shouldn’t have any rotational moment in the axle motion


Oh and years ago I was stripping an early RRC chassis for spring mounts and it definitely had leading and trailing rear dampers

S

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Originally Posted by roverrescue

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Coilers with upper and lower links shouldn’t have any rotational moment in the axle motion

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S

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Provided that there is no rubber in the suspension that allows the axle to twist! (In the RRC. and many others, there is)

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Originally Posted by AK83

??

RRC, as with the D1, both rear shockers are forward of the axle set with a slight angle.

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in workingonit's defence Early RRC had the left rear shocker forward of the axle & the right shocker rear of the axle ,

Pictured is my Hybrid made on a cut down 1974 RRC chassis , the right rear shocker is standard position for RRC of that vintage. The left rear shocker hard to see but def forward of axle.

http://goingbush.com/landy/90-10.jpg

http://goingbush.com/landy/90-7.jpg

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Originally Posted by goingbush

in workingonit's defence Early RRC had the left rear shocker forward of the axle & the right shocker rear of the axle ,

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Ah! didn't know this.

Mine was '79, and I'm sure I remember it be both forward.

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Originally Posted by goingbush

...in workingonit's defence...

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cheers...and of course only when I'm not making an ass of myself, otherwise no excuse.

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Originally Posted by AK83

??

RRC, as with the D1, both rear shockers are forward of the axle set with a slight angle.

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1984 model I'm working on has them in opposition.

Interestingly, I stripped a 1997(?) V8 D1 and the shocks were on the same side, despite my expectation that the later V8's would have made more power than the earlier V8's and more tramp effect.

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Originally Posted by AK83

... I'm sure I remember it be both forward...

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It becomes a blur after a while...pick a part up in the shed - now was this vacuum brake assist for the D1, the D2, the classic RR or the Series3 stage 1 - oh, that's right its for the land cruiser - and why did I come into the shed???

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Originally Posted by workingonit

1984 model I'm working on has them in opposition.

Interestingly, I stripped a 1997(?) V8 D1 and the shocks were on the same side, despite my expectation that the later V8's would have made more power than the earlier V8's and more tramp effect.



It becomes a blur after a while...pick a part up in the shed - now was this vacuum brake assist for the D1, the D2, the classic RR or the Series3 stage 1 - oh, that's right its for the land cruiser - and why did I come into the shed???

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It changed in the mid 80's to all facing forward.