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RonMacPherson
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Okay, 74's had four speed synchros. Synchronizer used on all forward gears.
The forks are shift forks, the brassish looking things hanging down from the rods on the trans upper cover.
The upper cover will have flat spots on either the top or side of the cover where the switches mount. The switches work by enabling a ground to pertinent circuit whenever that gear(reverse, 3-4 is engaged). With the cover off move the selector into reverse, observe the movement of the rod against the reverse switch. It should close it. You want to emulate the same affect when you select 3rd and 4th. So look at those rods and see where the mounting pad(s) are. That is where you will drill, tap and mount the switches.
The switch on the column, when activated, is the signal to the solenoid, completed through the selected switch to ground. So make sure your vehicle has a VERY good ground from the tranny/engine to chassis. I run a supplemental ground at the rear tranny mount, in addition to the one at the bellhousing bolts, on mine. Your supplemental wire harness, which is easy enough to make will provide power from the fuse box to the o/d solenoid on one lead, and the other lead will be from the selector switch to the 3/4 switch to ground. comprenedez-vous?
The forks are shift forks, the brassish looking things hanging down from the rods on the trans upper cover.
The upper cover will have flat spots on either the top or side of the cover where the switches mount. The switches work by enabling a ground to pertinent circuit whenever that gear(reverse, 3-4 is engaged). With the cover off move the selector into reverse, observe the movement of the rod against the reverse switch. It should close it. You want to emulate the same affect when you select 3rd and 4th. So look at those rods and see where the mounting pad(s) are. That is where you will drill, tap and mount the switches.
The switch on the column, when activated, is the signal to the solenoid, completed through the selected switch to ground. So make sure your vehicle has a VERY good ground from the tranny/engine to chassis. I run a supplemental ground at the rear tranny mount, in addition to the one at the bellhousing bolts, on mine. Your supplemental wire harness, which is easy enough to make will provide power from the fuse box to the o/d solenoid on one lead, and the other lead will be from the selector switch to the 3/4 switch to ground. comprenedez-vous?