This new MMST-12.1 Steering Shaft fits the just-redesigned Flaming River manual steering racks.
It also fits the previous generation of Flaming River manual steering racks, as well as OEM Ford manual racks and other aftermarket manual rack brands.
The first generation MM Steering shaft (MMST-12) doesNOTfit the newest Flaming River manual steering racks because Flaming River changed the retention feature on the input shaft on all of their manual steering racks.
The earlier Flaming River racks have a circular groove machined entirely around the input shaft. The newest Flaming River racks have a circular groove only on one side of the input shaft that intersects the shaft in a straight line. The new retention feature prevents use of the MMST-12 Steering Shaft.
Requiredwhenconverting to manualsteering rack.
Improves steering responseby eliminating deflection allowed by the stock rubber rag joint.
Reduces annoying playat the steering wheel.
Stays securebecause there areno setscrews to loosen.
Improved header clearance at the lower U-joint.
Precise fitmentto your Mustang because itstelescoping lengthaccommodates different steering rack positions.
Easier installationbecause it can be collapsed to a shorter length than stock, then extended to fit.
Improved safetybecause it adds a collapsible section between the rack and the firewall.
U-joints are weldedto the shaft, no setscrews to loosen.
Lower connection onlyfits manual rackinput shaft.
Attaches to steering rack with apinch-bolt clamp(just like OEM) instead of a setscrew.
Two race-qualityneedle-bearingU-joints replace the rubber rag joint and the upper pin-and-block U-joint.
Telescoping designallows lengthening, up to1.1" longer than stockshaft, to allowrepositioningof the steering rack.
Unique design of the collapsible center section prevents the two halves from pulling apart.
Collapses shorterthan a stock shaft.
For more technical information about steering shafts, click the button below.
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