21"] A C6 needs just one separator plate mod: To increases fluid flow to the direct clutch pack. enlarge this hole in the plate using the kit's 1la-inch drill bit. 2:22] The kit contains two different separator plate gaskets: 1967 to early 1976 (left) and late-1976-and-later (right). Make sure the gasket holes match the separator plate holes. especially for changeover year 1976! C6 valvebodies physically interchange, but the trans wont work right if an early valvebody is matched with a late trans (or vice versa ). 2 Valvebody assembly stack or- der: Place the upper half (A) with its internal components, check balls, and springs face up on the bench. Align the separator plate (B) and separator plate gasket (C) over the upper half. then position the lower half (D) on top and begin assembly, reversing the previous disassembly order. 22 ,, .j The C6s maior design flaw: a too-small band-apply servo. At a minimum, on the case's passenger side, remove the servo cover and replace the OE spring under the piston with the kits large red spring (1: i :). The stronger spring quickens the band-apply time, but it's still only a stopgap measure over 400 hp. C65 used behind 428 Cobra-Jets had a larger servo piston. Better yet: PAs separate (not included in the shift kit) billet-aluminum Super Servo kit (3 a], PM PA36411. right, versus stock setup. left). It also includes a new extra-heavy-duty black spring to pro- vide a standardized release force for the new servo. The lip on the black outboard piston seal must face toward the cover ( .122). a 1; Changing iust the servo spring or upgrading to a Super Servo reqUIres first releasing the band tensioner by backing off the band adjust- ment bolt (eT?3,A) located on the cases driver side. This photo also shows the manual (B) and downshift (C) levers. With tension released. nows a good time to polish the clutch drum band-apply surface with 180- to 220- grit sandpaper (245 ). Sand radially (not front to back) while hand-rotating the drum. then thoroughly flush-out the trans afterward. Adjust intermediate band: Lightly bottom the locknut, hold it steady with a 3la-inch wrench, and using a 3la-inch12-point socket, tighten the weird square-head bolt to 10 lb-ft. Back the bolt out one full turn if using just the shift kits new servo spring, or 11/4-11/2 turns with the Super Servo kit. Finally, hold the bolt head steady and final-tighten the nut to 40 lb-ft. ciajFor clarity, manyof these photoswere shot with the trans upside-downlon the bench. In the earlooking up, the view would be flipped" 180 degrees. HOTROD.COM/2019/APRIL/ B'l