Shifter VS Backup Light switch (Page 2/2)
fieroguru DEC 13, 04:09 PM
Reverse lockouts are designed to avoid accidental selection of reverse. They are much more important when R is to the left of 1st and in the forward position (fiero 4 speed and F40), as every time you stop, you have to find first gear and don't want any risk of accidentally grabbing R when stopped at an intersection.

The 4 speed reverse lockout (and the reverse lockout I designed for the F40) are adjustable. You want to be able to gently slap the shifter to the left, hit the spring and stay out of the R gate, pull the shifter to the rear and grab 2nd. Once in 2nd, then a quick push forward gives you 1st w/o any risk of grabbing R accidentally. I refined this driving style once I switched to the F40 as it has R in the same location as the 4 speed.

The issue with the 4 speed backup light... the switch is on a tab on the select lever. You pull the shifter past the reverse lockout, the tab will push the switch and turn on the backup lights. Pushing the shifter forward and into R is the shift movement and doesn't (shouldn't) change the select placement of the lever. However, when you relax the pull to the left, the reverse lockout spring will try to pull the shifter to the far right of the R gate. The transmission mechanicals will not allow the shifter to go from the R gate to the 1/2 gate w/o the shifter moving to the neutral state, but the reverse lockout spring will try to do so anyway. Any wear or slop in the shifter and cable will allow the select arm with the switch tab move far enough from the switch to allow the backup lights to turn off.

Some experimenting on where in the pressing of the switch the backup lights come on might show that the tab needs to be bent slightly to adjust the on/off of the lights or you minght find that adding some springy foam to the tab will help keep the switch plunger pressed and the lights on while the shifter is in R and you release the shifter.

Matthew_Fiero JUL 15, 02:18 PM
I've realized I have the same problem on my shifter assembly. There is enough wear on the roller or cam? To hold the shifter in place for the reverse switch. The spring immediately returns the shifter to the right.

If I use Rodney's kit to disassemble the lever to access the roller perhaps this could be replaced with a better material.