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Rocky Mountain Parablic Springs are manufactured
to ISO 9002 standards. These rugged springs are produced on state of
the art equipment and have advanced design features perfected over many
years of supplying parabolic springs to leading truck manufacturers.
The individual spring leaves are tapered, heat treated, and stress
preened under load for increased strength. Bending stresses in the
material are evenly distributed along the length of the leaf. There is
generous contact area on all wear points, and stresses caused by
drilling are minimized by having the guide straps positioned near the
end of the leaves. The clamp area under the axles is kept absolutely
flat to prevent preload. Spring bushings are a full 1¼ inches
diameter for greater flexibility and this increased curvature reduces
stress in the spring eyes. Springs are supplied in pairs and packaged
with correct 'U' bolts, nuts and washers needed to complete the
installation.
Fitting 'Rocky Mountain'
parabolic springs will raise the loaded ride height of your Land Rover
by about one inch when compared to stock springs.
The use of extended shackles to raise the ride
height further may create stability, and drive line problems and is not
recommended. Where extended shackles are used (as in military Land
Rovers) the extended axle buffer mounting must be retained to prevent
overstressing the springs in maximum compression.
PARABOLIC SPRINGS will make a very significant
improvement to your Land Rover and are probably the greatest single
modification worth making to enhance enjoyment of the truck for you and
your passengers.
Please take a moment to read the notes explaining
the advantages and disadvantages of each of the spring sets in our
range. If you have any further questions please contact us directly.
Front
Springs 73588:
All Purpose (Two Leaf)
73588 are front springs used on all models. These
springs have two parabolic leaves with a military wrap on the second
leaf. Like all Rocky
Mountain
springs they are supplied with a matching set of 'U' bolts designed to
fit the Rover axle.
20 kg (pair)
The length of these springs is carefully
controlled to allow the shackles exactly the right amount of slant aft
maximizing the range of travel on the spring in both directions.
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Rear
Springs 73589:
Two Leaf
73589 are light duty rear springs with two
parabolic leaves, used on '86' and '88' models where softer ride and
maximum axle articulation are desired. If you use your '86' or '88' off
road, with two adults and their gear, use these springs. Clips
positioned at the eyes prevent leaf distortion at maximum articluation.
An additional pad under the lower leaf reinforces the assembly. These
springs do not preclude you carrying heavier loads but you have to
accept that the rear of the truck will deflect more when such loads are
carried.
25 kg (pair)
CAUTION:These two leaf rears are not recomended if
you have a Safari roof or use a roof rack as the higher center of
gravity will increase body sway. You should not use these springs if
you use your Land Rover for towing a heavy trailer.
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Rear
Springs 73590:
Three Leaf
73590 are standard duty three leaf parabolic springs. If you often load
your '86' or '88' to the maximum rated load use these springs. Also use
73590 on stock '107' and '109' utility models and pickups with factory
hard tops, pickup cabs, and soft tops.
38 kg (pair)
On '86' and '88' models the 73590 spring is the
correct choice if you have a Safari roof, use a roof rack, or tow a
heavy trailer.
Do not use the 73590 if your standard '109' has a heavy custom camper
conversion or other heavy modification to the load area. The 73591 four
leaf spring is a better choice in such applications.
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Rear
Springs 73591:
Four Leaf
73591 are heavy duty four leaf rear springs used on '107' and '109'
models for service where heavy loading is normal. These springs are
usually fitted to five door "Safari" models. If you plan an expedition
or have fitted a camper conversion on your regular '109' use these
springs.
46 kg (pair)
CAUTION:If these springs are fitted to a lighter
'109' such as a canvas topped or pickup cab model, the 73591 springs
will raise the unloaded bed height to the extent that modifications to
the shock absorber mountings will be needed.
Parabolic springs may not be the best choice on the rear of a Land
Rover such as a canvas topped or truck cab model if you want to load
the truck to it's maximum rated capacity. The range or loads applied
extends and compresses the supple Parabolic spring beyond the range of
any shock absorber that can be fitted to the normal shock absorber
mountings.
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