What is the correct accelerator pedal height for the Cruise-O-Matic throttle linkage?

About 3⅝ inches, measured from a top corner of the pedal to the floor mat (Dimension "C," Fig. 11).

How do you adjust the manual linkage on a column shift Cruise-O-Matic?

With the engine stopped, loosen the clamp at the shift lever so the shift rod slides freely, position the selector lever in D1 (large dot), shift the transmission manual lever into the D1 detent (second from the rear), tighten the clamp on the shift rod, then check and reset pointer alignment for all detent positions if necessary.

How should the console shift knob button be set?

The button should be flush to 0.030 above the knob. Loosen the adjustment screw in the center of the knob, rotate the button to the proper height, and tighten the lock screw.

In which positions should the starter neutral switch allow the engine to crank?

The circuit must be open in all drive positions and closed only in park and neutral — the starter should engage only in park or neutral.

Are there any adjustments on the vacuum diaphragm unit or downshift rod?

No. The manual states there are no adjustments on the vacuum diaphragm unit or the downshift rod; the throttle linkage adjustment steps cover the adjustment completely.

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Cruise-O-Matic/Merc-O-Matic Throttle & Shift Linkage Adjustment - 289 352 390

Ford throttle and column-shift linkage adjustment, Cruise-O-Matic/Merc-O-Matic dual range 352/390 V-8

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Ford shop manual page 7-63: throttle linkage (Fig 11) and column shift manual linkage (Fig 12) adjustment for Cruise-O-Matic/Merc-O-Matic; set pedal height ~3.5 in, lengthen link one full turn CCW.

AI caption April 2014 · Photo 63 of 242

This is page 7-63 of a factory shop manual, Part 7-3 covering the Cruise-O-Matic or Merc-O-Matic Dual Range automatic transmission. Figure 11 illustrates the throttle linkage for both the 352 V-8 / 390 V-8 engines and the 289 engine, with callouts identifying the dashpot adjustment, carburetor connecting link, accelerator bellcrank assembly, gauge pin hole, accelerator retracting spring, accelerator connecting link, downshift control rod, floor mat/insulation, and pedal height 'Dimension C.' Text continues throttle linkage adjustment steps 8–10, including adjusting the carburetor connecting link length, verifying free entry of the gauge pin, and setting accelerator pedal height at about 3-5/8 inches from the pedal top corner to the floor mat. It states there are no adjustments on the vacuum diaphragm unit or downshift rod. The page then details manual linkage adjustment for column shift transmissions (five steps using the D1 detent, second from the rear) and console shift transmissions (shift knob button flush to 0.030 above the knob, adjusting via the knob's center screw, and tightening the manual linkage rod retaining nut in D1). It concludes with the start of starter neutral switch adjustment for column shift, noting the starter must engage only in park or neutral. Figure 12 photo shows column shift linkage components: lock nut, clamp, shift rod, shift lever.

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Frequently asked questions

What is the correct accelerator pedal height for the Cruise-O-Matic throttle linkage?: About 3⅝ inches, measured from a top corner of the pedal to the floor mat (Dimension "C," Fig. 11).
How do you adjust the manual linkage on a column shift Cruise-O-Matic?: With the engine stopped, loosen the clamp at the shift lever so the shift rod slides freely, position the selector lever in D1 (large dot), shift the transmission manual lever into the D1 detent (second from the rear), tighten the clamp on the shift rod, then check and reset pointer alignment for all detent positions if necessary.
How should the console shift knob button be set?: The button should be flush to 0.030 above the knob. Loosen the adjustment screw in the center of the knob, rotate the button to the proper height, and tighten the lock screw.
In which positions should the starter neutral switch allow the engine to crank?: The circuit must be open in all drive positions and closed only in park and neutral — the starter should engage only in park or neutral.
Are there any adjustments on the vacuum diaphragm unit or downshift rod?: No. The manual states there are no adjustments on the vacuum diaphragm unit or the downshift rod; the throttle linkage adjustment steps cover the adjustment completely.