Speedometer shows 00's - Page 2 - ZR-1 Net Registry Forums

herc795 · 01-21-2017

The other question is what is the gear made of?

Marc Haibeck · 01-22-2017

The gear can't go farther forward than the sensor mount. It's now located on the output shaft somewhere between the sensor and the drive shaft slip yolk. If the drive shaft is removed the gear can be removed from the output shaft.

The OE gear has 13 teeth and is grey plastic material. It is retained with a spring clip. In the late '90's there was an aftermarket metal 14 tooth gear that was pressed on. It was used for speedometer correction with a 3.90 axle gear set. Sometimes it was incorrectly used for other ratios.

Marc Haibeck · 01-22-2017

Correction. The OE gear has 15 teeth.

herc795 · 01-23-2017

Marc,
The other question I have is what caused this to happen? In order to fix it will I need to drop the transmission? Where can I get the correct parts?

WVZR-1 · 01-23-2017

Quote:

Originally Posted by herc795

Marc,
The other question I have is what caused this to happen? In order to fix it will I need to drop the transmission? Where can I get the correct parts?

How long have you owned this car? Does it still have the factory rear axle ratio? Speedo quit when?

The gear if it's a factory ratio and the 15 tooth is needed nearly anyone whose done a gear change and did a mechanical correction that requires a different drive should have their OE to sell!! The retainer is a different issue.

Perhaps since Marc has responded to this thread maybe he'll revisit and mention what your next "to do" should be. Is the VSS still removed and car on a lift or back together?

*** sorry I didn't see the post was directed to Marc

herc795 · 01-23-2017

WVZR-1,
It stopped working when I was driving this fall, in fact it was the last time before I put the car away. I still have it apart, need to fix it. I have the car since 2005. I believe it has stock rear end.

Marc Haibeck · 01-24-2017

If the clip fell off, it's probably in the tail extension. Search for it with a magnet.

The gear should be on the shaft a few inches to the rear of the sensor hole. maybe you can fish it back forward with an 8" wire with a hook.

herc795 · 01-30-2017

I dropped the transmission and took the rear extension housing off. I believe the drive gear clip failed. this caused the teeth on the drive gear to get chewed up some. I need to find a new drive gear and clip, anyone have an idea where I could find them.

01-21-2017	#11
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's The other question is what is the gear made of? __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-22-2017	#12
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: Speedometer shows 00's The gear can't go farther forward than the sensor mount. It's now located on the output shaft somewhere between the sensor and the drive shaft slip yolk. If the drive shaft is removed the gear can be removed from the output shaft. The OE gear has 13 teeth and is grey plastic material. It is retained with a spring clip. In the late '90's there was an aftermarket metal 14 tooth gear that was pressed on. It was used for speedometer correction with a 3.90 axle gear set. Sometimes it was incorrectly used for other ratios.

01-22-2017	#13
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: Speedometer shows 00's Correction. The OE gear has 15 teeth.

01-23-2017	#14
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's Marc, The other question I have is what caused this to happen? In order to fix it will I need to drop the transmission? Where can I get the correct parts? __________________ 1990 Red ZR-1 #2300 DT :cheers: Last edited by herc795; 01-23-2017 at 10:44 AM.

01-23-2017	#16
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's WVZR-1, It stopped working when I was driving this fall, in fact it was the last time before I put the car away. I still have it apart, need to fix it. I have the car since 2005. I believe it has stock rear end. __________________ 1990 Red ZR-1 #2300 DT :cheers:

01-24-2017	#17
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 241	Re: Speedometer shows 00's If the clip fell off, it's probably in the tail extension. Search for it with a magnet. The gear should be on the shaft a few inches to the rear of the sensor hole. maybe you can fish it back forward with an 8" wire with a hook.

01-30-2017	#18
herc795 Join Date: Jul 2013 Location: Mansfield, OH Posts: 20	Re: Speedometer shows 00's I dropped the transmission and took the rear extension housing off. I believe the drive gear clip failed. this caused the teeth on the drive gear to get chewed up some. I need to find a new drive gear and clip, anyone have an idea where I could find them. __________________ 1990 Red ZR-1 #2300 DT :cheers: