Shifter base for Tremec aftermarket T56 w/ 4-bolt base on tail

Shifter base for older AFTERMARKET Tremec T56 6 speed w/ 4-bolt base on tail (not Magnum):

  • Tremec #s including 1386-000-011, 1386-000-012, TUET-1259, TUET-1260
    • NO other T56 models - see separate listings
      • Does NOT FIT Magnum or any TR6060!

Base mounts at tail location on a rectangular 4-bolt pattern that is ~ 2.88" wide x 3.44" long; stub pivot ball center is ~1.2" below the flange

A Hurst stick is required (NOT included, sold separately). Other brands and homemade sticks are discouraged. Stick mount has 3/8"-24 threaded holes spaced 7/8" apart on center + mating serrations for a Hurst stick on one face. Due to larger mounting threads (3/8"-24), sticks that use 8mm mounting bolts (most OE, "non-TKO" Lokar, others) will not work. Lokar TKO sticks can be mounted but only to the smooth side of the stub. To select the proper parts:

  • Wait until new transmission is installed to buy shifter parts
    • Remove existing shifter base if present
    • Sit in vehicle, in driving position, with all interior trim (dash, console, etc) in place
  • Define desired knob location in space (neutral position):
    • Measure height from base flange to desired knob location = overall height
    • Measure side & rear offsets from receptacle bore to desired knob location
    • See this diagram for clarification
  • Study the Hurst stick page for shapes that meet your needs
    • Allow 3-6" for stick mount height
    • Choose a stick and see what fulcrum heights are compatible with it (see chart)
    • Check overall height (see chart: stick height + mount height = overall height)
  • Confirm chosen combination achieves desired knob location and that fulcrum height works with stick length selected
    • Consider various stick & stub combinations to optimize
    • Note long sticks on angled mounts will strongly offset knob to left (can be 5-6"+)
    • Options E & F require a Hurst stick directly mounted on side w/ serrations

Stub fulcrum height options (critical to optimizing leverage for short throw):

Option For stick length stick mount height stick mount angle upcharge
A 8" 3.1 vertical default
B 10" 3.6 vertical +$10
C 10"+ 4.6 vertical +$20
D 12"+ 5.4 angled 14 deg left +$30
E 13"+ 4.3 angled 14 deg left +$40
F 14"+ 4.5 angled 14 deg left +$40
G 6" 3.5 angled 11 deg left +$10
H 5" 3.0 vertical +$10
  • Stick length = point-to-point distance from mount hole to knob thread
  • Stick mount height = distance from base flange to stick bolt hole (affects knob height)
  • Fulcrum height = distance from lower ball to fulcrum pin; varies by option, not published
    • Warning: Follow stick length guide to avoid excess effort & component failure

Kit includes mounting hardware and instructions. The base is built by Core Shifters using proven components inside a custom housing:

  • Billet steel gear selector stub
  • Hardened steel cross-pin & stainless steel fulcrum pivot ring
  • Self-centering cross-gate bias springs with heat treated spring seats
  • Glass-reinforced polyamide fulcrum socket with steel wear clips
  • Extruded aluminum housing with Spirolox steel support ring
  • Zinc-plated laser-cut steel base-plate & cover
  • Rubber oil control seal with steel retaining ring
  • Vibration-resistant serrated flange head steel retaining bolts

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