Basic Coil Conversion Kit
Standard 3900KG Package
Optional Extras & Upgrades
JMACX 4495 SUPER CHASSIS
Frequently Asked Questions
What is a coil conversion?
A coil conversion is the process of removing the standard leaf spring suspension system from a vehicle and converting it to a coil spring suspension setup.
What is the advantage of coil springs?
One of the biggest advantages of coil springs is ride comfort, coil springs are known for offering a plush ride whilst leaf springs traditionally ride rougher. Coil spring vehicles often handle nicer onroad and also perform better offroad due to increased ground clearance & wheel travel.
How much does a coil conversion cost?
Our coil conversions aren’t a one size fits all modification and therefore there is not a set price for the conversion. There are a few different ways to do a coil conversion and there’s a lot of options for different parts to be included. Generally no two coil conversions will be the same price due to each individual customers preferences however pricing for a full vehicle package starts from around $20,000 including parts, installation & engineering.
Is this conversion 100% road legal?
We can engineer the coil conversion pre rego on brand new vehicles or post rego on already registered vehicles. Providing the vehicle gets engineered and all of the components within the kit remain on the vehicle once engineering is done then the modification will be 100% road legal.
Is my car covered by insurance with a coil conversion?
All of our GVM packages and coil conversions can be engineered, once engineered they are completely road legal. Generally, if a modification is road legal and engineered your insurance company won’t have any issues covering your vehicle and the modifications. We do always recommend double checking with your insurance company just to be sure.
Can I find spare parts in the middle of nowhere?
The Jmacx diff housing retains the use of a factory Toyota diff centre, diff lock, driveshaft, brakes, seals, bearings and hubs. Factory bushes are also used and the coil kit uses factory length suspension arms. The use of factory fitted items makes it much easier & quicker to source spare or replacement parts.
Does the replacement diff housing correct my track?
Yes, the Jmacx diff housing is a 6mm fabricated housing and is 100mm wider than the standard diff housing. This corrects the wheel track to match the width of the front axle. The Jmacx diff is also much stronger, standard diff housings are only rated to 2300kg, whereas the Jmacx diff housing is tested to 3000kg (the legal axle load rating will depend on the specific GVM kit).
What size tyres can I fit with my coil conversion?
There is the option to fit 33 or 35 inch tyres to a 70 series with a coil conversion and this is based on suspension lift. A 2 inch lift allows for the fitment of 33 inch tyres and 3 or 4 inch lifts allow for the fitment of either 33’s or 35’s.
How long does it take to install a coil conversion?
To install a basic coil conversion, we will generally need your car for approximately one week. When the kits become more complex with alterations or optional extras this does add time to the installation process and we may need it for longer.
Do I need load rated rims and tyres with a GVM upgrade?
Yes, every vehicle requires load rated rims & tyres regardless of whether or not the GVM has been upgraded. To work out the required load rating for your rims & tyres you can simply divide the vehicles highest axle rating by half, usually this will be the rear axle. For example a 2020 model Landcruiser 79 series dual cab comes from Toyota with a 3300kg GVM, the front axle rating is 1480kg and the rear axle rating is 2300kg which means the minimum required load rating for rims & tyres on this vehicle is 1150kg each (2300kg divided by 2 = 1150kg).
Does fitting a GVM upgrade reduce my towing capacity?
Technically not, a GVM upgrade should never decrease your towing capacity however it may reduce the amount you can legally tow. Most GVM upgrades will only replace suspension components which allows your GVM to be increased but makes no change to your legal combined weight of GVM and towing capacity (often referred to as GCM). Jmacx coil conversion packages upgrade a lot more components and undergo extensive testing which allows you to legally utilise your full towing capacity while loaded at your full GVM.
Can we do a coil conversion on other vehicles?
Currently no, at this stage we only offer coil conversions for the 70 series Landcruiser range of vehicles. These kits have been developed specifically for the V8 models from 2007 onwards and do not fit older models.
Confused or keen to find out more?
We get it! There’s a lot to take in and you potentially now have more questions than answers.
That’s okay, our sales team will be more than happy to talk you through everything about coil conversions and help find the best option for you. We can put together a package and provide a personalised quote to best suit your individual application. Get the ball rolling by filling out our contact form.