HomeRM ProductsAbout our ParabolicsSpring FAQReviewsInternational AgentsManualsTBATBA

Parabolic Springs

Rocky Mountain Parabolic Springs are manufactured to ISO standards. These rugged springs 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 peened 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 1 1/4 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 at least one to two inchs 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.

Please note that with improved ride and articulation there comes increased sensitivity to loading. Additionally, If you are switching from multi leaf springs you may find that the drive shaft U joints require servicing. As multi leaf springs offer little articulation worn U joints may not have been noticable whereas with the new springs they will be required to perform to spec.


Front Springs 73588: All Purpose (Two Leaf) $242.00 USD/PAIR

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.

Rear Springs 73589: Two Leaf $264.00 USD/PAIR

73589 are medium 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' 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. These springs suit the majority of SWB trucks.



25 kg (pair)

CAUTION:Two leaf rears may increase body sway if you use a roof rack, as a result of the the higher center of gravity. You should concider three leaf rears for these applications and do not use these springs if you use your Land Rover for towing a heavy trailer.

Rear Springs 73590: Three Leaf $353.00 USD/PAIR

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' used for general utility.



38 kg (pair)

On '86' and '88' models the 73590 spring is the correct choice if you use a roof rack, or tow a heavy trailer.
If your standard '109' has a heavy custom camper conversion or other heavy modification to the load area you may require a 73591 fourth leaf spring addition.

Rear Springs 73591: Fourth Leaf $150.00 USD/PAIR

73591 are a heavy duty fourth leaf rear spring to be added to the 73590 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 can 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.

 
Address:
Rocky Mountain Products
PO Box 91335, West Vancouver, BC Canada, V7V 3N9


Telephone: (604) 913-7910

Email: rmhighroad@gmail.com