Maximum Motorsports Steering Shaft Assembly, Manual Steering Rack, 1979-93 Mustang MMST-12.1

Maximum Motorsports
SKU: MMST-12.1
Availability: 5 in stock
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Solid Steering Shaft Assembly fits manual steering rack equipped 1979-93 Mustang 


  • 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) does NOT fit 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.


  • Required when converting to manual steering rack.
  • Improves steering response by eliminating deflection allowed by the stock rubber rag joint.
  • Reduces annoying play at the steering wheel.
  • Stays secure because there are no setscrews to loosen.
  • Improved header clearance at the lower U-joint.
  • Precise fitment to your Mustang because its telescoping length accommodates different steering rack positions.
  • Easier installation because it can be collapsed to a shorter length than stock, then extended to fit.
  • Improved safety because it adds a collapsible section between the rack and the firewall.

Product Features

  • U-joints are welded to the shaft, no setscrews to loosen.
  • Lower connection only fits manual rack input shaft.
  • Attaches to steering rack with a pinch-bolt clamp (just like OEM) instead of a setscrew.
  • Two race-quality needle-bearing U-joints replace the rubber rag joint and the upper pin-and-block U-joint.
  • Telescoping design allows lengthening, up to 1.1" longer than stock shaft, to allow repositioning of the steering rack.
  • Unique design of the collapsible center section prevents the two halves from pulling apart.
  • Collapses shorter than a stock shaft.

For more technical information about steering shafts, click the button below.