1986-2014 Mustang 8.8" Rear Differential Fluid & Seal Kit
This 1986-2014 Mustang 8.8" rear differential fluid and seal kit is the perfect way to finish up any differential repair, upgrade, or modification. Whether you are installing new rear gears, putting in a new differential, or simply wanting to drain & refill your differential fluid, this kit can help get the job done. Featuring 2 bottles of Royal Purple Max-Gear Gear Oil 75W140, 1 bottle of Ford Motorcraft friction modifier, and a differential gasket, this kit has everything you need to complete your install.
With high-quality fluid from top names in the business, you know you are getting the best fluid available for your Mustang. Late Model Restoration has put together this kit with Royal Purple and Ford Motorcraft fluids to keep your differential running smoother and quieter. With the included Lube Locker gasket, you can rest assured your differential will be sealed up to prevent leaks. This gasket has a built-in rubber seal so you do not need to apply messy RTV sealant.
Ford Friction Modifier
Although Royal Purple has some friction modifier in it, Ford rear ends needs a little bit more. This kit includes one bottle of friction modifier to provide smooth operation of clutch-type limited-slip differentials. The specially formulated additive eliminates rear-end chatter for quiet operation.
LMR recommends the 75W140 viscosity for all 1986-2014 8.8" differentials as it is appropriate for most climates, fuel economy, and performance.
When running an aftermarket differential cover, check the fluid capacity recommendation as more fluid may be required.
Royal Purple - Unleash The Power
The most frequent comment from customers is how they can feel the difference in their vehicles after switching to Royal Purple. For instance, Royal Purple Motor Oil typically improves horsepower and torque up to 3%. It also reduces fuel consumption by as much as 5% and typically reduces emissions 20% or more. Performance gains will vary depending on the type of vehicle, its condition, and the way it's driven. Shop Latemodel Restoration to get all of the Royal Purple oil and lubricants you need!
The wheel size is the diameter of the wheel, in inches, not counting the tire.
Modern tires in North America have several other measurements associated with their size.
A tire designated as a "225/70R14" denotes a tire with the following dimensions: width of tread: 225 mm; ratio of tire height to width: 70 percent; rim diameter: 14".
Therefore a 185/70R14 has the same rim diameter and aspect ratio, but a smaller overall diameter and narrower tread face than the 225/70R14.
The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up.
Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is the backspace.
The photo below shows three wheels with 2", 3", & 4" backspace.
Wheel Bolt Pattern
The bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. Bolt patterns can be 4, 5, 6, or 8 lug holes. A bolt circle of 4x100 would indicate a 4 lug pattern on a circle with a diameter of 100mm.
The diagram indicates the proper measuring methods. 6 lug wheels are measured like the 4 lug wheels.
The offset, measured in millimeters, can be negative or positive, and is the distance from the hub-mounting surface to the rim's true centerline. A positive offset means the hub-mounting surface is closer to the outside edge of the wheel; a negative offset means the hub-mounting surface is closer to the inside edge of the wheel. Offset affects the scrub radius of the steering and it is advisable to stay within the limits allowed by the vehicle manufacturer. If tires are fitted which are significantly wider than those specified by the manufacturer, a compromise may have to be adopted whereby a wheel with less offset is used to prevent the tire rubbing on the suspension.