How do you set the C6 manual valve to the Neutral detent position before installing the valvebody?

For the 1967–1970 C6 with a detent spring in the valvebody, push the manual valve all the way in until it bottoms, then pull it out two audible clicks.

What is the torque spec for the C6 valvebody-to-case bolts?

100 lb-in, per the Torque Limits & Adjustments table.

What fluid should the C6 be filled with after reassembly?

Type F fluid, added after bolting on the pan.

How do you adjust the C6 vacuum modulator for shift timing?

On this single-line modulator at the rear of the case's passenger side, turn the adjusting screw in for later shifts and out for earlier shifts.

Is there a pre-assembled valvebody option instead of doing the shift kit yourself?

Yes, Performance Automatic offers a fully assembled street/strip valvebody, PN PA36301, which bolts into 1967–1970 models; assemblies for other model years are also available.

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Ford C6 Valvebody Install & Torque Specs - Hot Rod April 2019 Shift Kit Guide

C6 transmission valvebody reinstallation and vacuum modulator shift-timing adjustment magazine page

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Hot Rod tech page on C6 automatic valvebody reinstall (1967-1970 detent-spring type) plus torque limits and vacuum modulator shift-timing adjustment; turn adjusting screw in for later shifts.

AI caption February 2019 · Photo 311 of 363

This is page 82 from the April 2019 issue of Hot Rod magazine ('Wrenchin' @ Random' section), covering the final steps of a Ford C6 automatic transmission valvebody/shift-improvement kit installation. Captions 26–28 explain the tricky valvebody reinstallation: prepositioning the downshift and manual trans-case levers, setting the manual valve to its Neutral detent (push fully in, pull out two audible clicks on this 1967–1970 C6), and aligning the manual lever's button end into the manual valve notch while fitting the downshift lever between the bolt end and the throttle downshift valve. Caption 29 covers bolting on the pan, filling with Type F fluid, and readjusting the single-line vacuum modulator (screw in for later shifts, out for earlier). Caption 30 introduces Performance Automatic's fully assembled street/strip valvebody, PN PA36301, for 1967–1970 models. A 'Torque Limits & Adjustments' table lists ten fastener specs (e.g., oil pan to case 8–12 lb-ft, valvebody to case 100 lb-in, intermediate servo cover to case 14–20 lb-ft). Contact info is given for Advanced Engineering West (Mira Loma, CA) and Performance Automatic (Frederick, MD). A footnote notes photos were shot with the trans upside-down on the bench.

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Frequently asked questions

How do you set the C6 manual valve to the Neutral detent position before installing the valvebody?: For the 1967–1970 C6 with a detent spring in the valvebody, push the manual valve all the way in until it bottoms, then pull it out two audible clicks.
What is the torque spec for the C6 valvebody-to-case bolts?: 100 lb-in, per the Torque Limits & Adjustments table.
What fluid should the C6 be filled with after reassembly?: Type F fluid, added after bolting on the pan.
How do you adjust the C6 vacuum modulator for shift timing?: On this single-line modulator at the rear of the case's passenger side, turn the adjusting screw in for later shifts and out for earlier shifts.
Is there a pre-assembled valvebody option instead of doing the shift kit yourself?: Yes, Performance Automatic offers a fully assembled street/strip valvebody, PN PA36301, which bolts into 1967–1970 models; assemblies for other model years are also available.
What is the oil pan to case torque spec?: 8–12 lb-ft.