C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

OD issue

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Old Jan 4, 2008 | 06:25 PM
  #1  
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From: Morristown TN
Default OD issue

I am having a problem with my OD not wanting to shift on and off when I press down on the tab on my gear shift. My car is an 88 L98 4+3. I took the cap off today and everything seems to be fine. There is a little T shaped piece that gets depressed.

I tried driving it without the cap on and it still had problems shifting in and out of OD. Any ideas on what I should do next to fix it? One other thing, when it does shift, everything is smooth and it works fine.

Thanks,

Keith
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Old Jan 4, 2008 | 09:26 PM
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This should help your diagnosis

http://members.shaw.ca/agent86/Overd...iagnostics.pdf
http://members.shaw.ca/agent86/OD%20Switch.pdf
http://members.shaw.ca/agent86/OverD...Electrical.pdf
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Old Jan 4, 2008 | 09:28 PM
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hello
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Old Jan 5, 2008 | 10:43 AM
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!WARNING!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!

If you decide to remove the "t" rod, COUNT the number of turns it took to remove it and WRITE IT DOWN. If it is indeed just the momentary switch in the shifter, you can do a search here for a replacement since I believe the OEM is no longer available. I ended up buying an entire shifter assembly several years ago before learning about this.
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Old Jan 5, 2008 | 10:51 AM
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It is probably one of three items. Bad switch, bad relay or bad ground. My problem was the switch. Search forum for diagram and instructions to replace the switch.
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Old Jan 5, 2008 | 01:44 PM
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Thanks for the replies. I will check these items out.
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Old Jan 5, 2008 | 10:13 PM
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I'ts usually the relay ( about $12). Being low on trans fluid will also make it act up.

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Old Jan 6, 2008 | 01:18 AM
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Originally Posted by Curveit
I'ts usually the relay ( about $12). Being low on trans fluid will also make it act up.


Good point. When was the last time the fluid and filter were changed? If you don't know, then I'd suggest getting it done.

another WARNING!!!!!!!!!!!!! however.

DO NOT use the gasket that comes with the kit. Use RTV. The gasket will leak regardless of how tight you bolt it back down.
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