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Adjustable Shifter Sector Arm for GM HydraMatics
Automatic transmissions require a shifter to move through the operational ranges. We offer products from parts to make your existing automatic shifter function with the new transplant. For full shifter kits, consider Lokar, Gennie, B&M, Winters and other brands.
This bellcrank arm is machined from aluminum billet, and is splined to match the included spline hub which attaches to the GM sector shaft on the driver's side of the transmission. The arm can be set by this mechanism to achieve the best mechanical advantage over its sweep, in relation to the angle of the shifter rod or cable, as applicable.
It works in push or pull scenarios.
The arm is slotted for the installer to set the leverage vs. sweep distance required for the available linear travel of the linkage.
Frequently used in conjunction with Novak's #SK-795 shift cable bracket on TJ, LJ and XJ Jeeps. See Related Products, below.
Kit contents:
- Shift arm
- Hub, splined
- Imperial & metric fastener options
- Instructions
Compatible Jeeps
- FSJ Jeeps, including Wagoneers, Cherokees, J-Trucks
- C101 & C104
- CJ
- XJ
- YJ
- TJ
- JK
This shift arm can be used with the following type of linkages:
- Steering column shifters based on bellcrank linkages
- Steering column shifters based on cable linkages
- Console shifters based on cable linkages
Installation Requirements
Installation will require basic hand tools, some understanding of the physics of leverage and some basic math to set the fulcrum, initial angle, sweep and final angle of the arm in relation to the available travel of the factory linkage.
Any factory console shifter detents or comb plates may need to be removed, as the installer will rely on the detents provided in the GM transmission, itself.
Notes
We can suggest the following distance settings for the arm pivot center to the linkage bearing end, as set in the available slot in the arm for the TH350, TH400, 700R, 4L60E and 4L80E transmissions:
- JK: 1.83"
- XJ (replacing the AW4): 1.45"
- FSJ (replacing the AMC TH400 or TF727): 1.88"
- CJ (replacing the AMC TH400, TF909/999): 1.88"
- YJ (replacing the TF909/999/32RH): 1.88"
Your results may vary, but these may offer good starting points for your testing and further adjustment.
