Order a Catalog
it comes to ordering a pair
of axles for your race car
there is often a lot more to
it than meets the eye. The
following will give some insight
into the information needed
to order new axles and what
to expect during the ordering
It’s important to note that each and every axle manufactured by Mark Williams
Enterprises, including its economical MasterLine brand, is custom-made for the
exact application. There are “racing” axles on the market that are
produced in gang runs with long splines, which are merely chopped off to provide
the desired overall length. This usually creates a situation where the splines
are much longer than needed which make them prone to twisting. When the axle
lengths are calculated correctly and axles individually produced the spline length
can be optimized for the spool or differential being used.
If you’re in the process of building a new car or updating an existing
one and will be narrowing the rear end assembly to accommodate a large tire there
are a few easy steps that will ensure a perfect fit. The preferred method is
to get a set of tires and wheels the size you intend to use. Keep in mind that
wheel back space is very important. Most times a 3" to 4" back space
is common to provide ample clearance for easy removal at the track (too much
back-spacing can be problematic if there is a limited wheel well opening).
The next step would be
to remove the stock
rear end housing and
perform any needed
modifications to the
inner fender wells
and/or frame rails.
Next, put the car on
jack-stands at the
intended ride height
and stance. Place the
into the desired position,
giving yourself adequate
clearance to suspension members and/or fenders. Make sure the face of the
wheels are straight up and down, slide shims under the tires as needed.
With the wheels in position,
measure from the mounting
surface of the drivers
side wheel to the mounting surface of the passenger side wheel. This
will give you the proper
wheel to wheel measurement.
Now, subtract the thickness
of any disc brake hats or drums and you will have the axle flange-to-flange
dimension. You should also know that pinion offset effects axle lengths.
Most tube chassised cars will have a centered pinion while cars utilizing
the factory driveshaft tunnel will require the OEM pinion offset (normally
offset to the passenger side) to avoid driveshaft clearance problems.
Also, the axle bearing
size will come into
play. If you’re starting from scratch, bigger is better.
When ordering new axles
and a spool is going
to be used it's best
to get them with the
largest spline possible.
For most applications
(excluding Pro categories)
35-spline axles are
adequate. It should
be noted that M-W offers
spools for GM 10 & 12 bolts, 8.8 Fords and 9" Fords using a stock center section with
35 spline, the largest available for those applications. 40 spline is also available
for all other applications. M-W cuts all axle splines using the hobbing process
which creates a true involute profile and maintains spline concentricity, this
is preferred splines that are cut individually.
If you are simply be replacing
a set of existing axles
you'll need to measure
their length and also
note the axle bearing
size. Of course, with
certain OEM housings
you’ll need to eliminate the factory C-clip setup. IHRA mandates
the use of axle retention devices.
To make ordering axles
easier, you can download
a page from the latest
M-W catalog (http://www.markwilliams.com/Catalog/pg4.pdf) at www.markwilliams.com.
and fill in the blanks. You can also call M-W's tech advisors toll-free
at 866-508-3374 for additional information.