Longfield 30-Spline 4340 Chromoly Super Set Pickup/4Runner +3 (for Rock Assault)
This 30 Spline +3 Kit is designed exclusively for the Rock Assault
Front Axle Housing. The Rock Assault Front Axle housing is 3" longer
than stock on the short side of the axle tube, so The 30 spline +3
Birfield Kit has a +3" short side axle shaft.
With larger tires and more horsepower being used on the trails these
days, upgrades to your axle are more critical than ever. In a Toyota,
one of the common failures are the stock 27-spline birfields and axles.
The solution to this problem is our Longfield™ 30-Spline 4340 Chromoly
Super Set. These birfields and axles will get you to wherever you need
to go and give you confidence and peace of mind to run any trail.
The Longfield™ birfields are made out of 100% chromoly and are
precision polished to remove any imperfections that may cause stress
risers. The Longfield™ birfield housing is made out of forged 4340
chromoly steel. The axle shafts are also made out of 4340 chromoly
steel. The internals of our Longfield™ birfields are made out of vacuum
arc remelted 4340 chromoly steel and then dual heat-treated for superior
We understand that once you upgrade your axles, the next weak link is
your hub gears, so we decided to include our Chromoly Inner and Outer
Hub Gears and Creeper Drive Flanges at no additional cost! This will
give you the confidence that your front axle will stand up to any trail
you wish to run, and will save you $365.40 over purchasing them separately.
These parts have undergone years of extensive in-house and field
testing. We are so confident with the Longfield™ 30-Spline 4340 Chromoly
Super Set that we are offering this kit with our No Questions Asked
Lifetime warranty. This warranty has no limitations and is not limited
by the size of the tires on your rig.
The Longfield 30-spline Birfields
allow up to 40 degrees of turning radius and have a consistant breaking
point of 8900-9000 foot pounds of torque (all testing data is based on
internal testing at TGI).
Contact our Tech Support Line for further information at 928-855-6341.
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