Anyone change the backup light switch on a ZF? - Corvette Forum : DigitalCorvettes.com Corvette Forums
 
 
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Old 04-16-2008, 04:53 PM   #1
any4xx
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Anyone change the backup light switch on a ZF?

Holy mother of pearl. My backup light switch is bad in my LT4/ZF6. That damned thing is mounted way up in the cheap seats. I had to use long needle nose pliers to even get the electrical connection off to test it today. Anyone know the easiest way to swap this once my new switch comes in? If from below, I'm almost certain that the clutch slave has to come out to even reach it. Any way to get it out from above?
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Old 04-16-2008, 05:13 PM   #2
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You will probalby find out that the switch you remove actually works like the one I had on my 91 ZR-1 did. I was having to put in a new clutch (too much autocrossing )and decided to look at replacing the switch while I had the transmission out of the car. The switch was good, but they are known for not being depressed far enough by the ZF transmission to turn on the back up lights. I was able to get mine working when I reinstalled the transmission, but it then quit again a few months later.

There was actually someone on the ZR1 website that had made up a specially modified tool to reach up and remove the switch that was continually getting passed around to others for trying to fix the problem in their cars. You may have to do like most owners of this transmission and live without backup lights.
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Old 04-17-2008, 03:33 AM   #3
LD85
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Barring any type of special miracle tool,,,

You would probably have to pull the front Y-pipe, then take the C-beam off, then pull the rear u joint and tilt the tranny down in the back to get any kind of easy access.

I could be wrong, but mine is up against the tunnel as it is.
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Old 04-18-2008, 06:29 PM   #4
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It turned out to be pretty easy. On the second try, that is. First I dropped the clutch slave cylinder. That took two minutes. Then I tried hacking the end off of a 7/8" deep socket. That would have been the end of the job except that I cut it just about 1/8" too short. D'oh! A $10.00 Craftsman socket down the tubes for nothing. So I shot down to the Auto Zone and picked up an offset O2 sensor socket. It's basically a mid-length 7/8" socket with the drive section offset to the side. Think about cutting the drive end off of a deep socket and welding it back onto the side so the socket looks like an "8" from the end. That slipped right on and a 1/2" breaker bar slipped right on. One pull and it was loose.

I tested the old switch and found you had to depress the plunger almost all the way in for it to activate. The new switch activated with the plunger pressed in about 2mm. Perfect! Now I have backup lights.

The socket from Auto Zone was $9.99. The socket I destroyed will cost me the same to replace.
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Old 04-18-2008, 08:19 PM   #5
LD85
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Awesome, I'll have to remember this, take a pic of the tool if you can!
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