Just had the sensor replaced due too a transmission leak at the sensor. Now i have a whine or ticking comming from the sensor. Have ordered another, mech thinks the one he replaced was faulty. 3-4 hour job getting sensor out. Before I get this one replaced any thoughts. Greatly apprieciated.
thanks
Betyelou

 

3-4 hours? It takes me 3-4 minutes..

-- Joe

 

Sensor is front of transmision, mech. had to drop x cross suspension just to get at it. Any sugestions on what is wrong before I replace again.

thanks

 

What exactly is this on?

What your suggesting does not sound right for a C4 w/ 700R4, ZF6, or 4+3.

Mechanical cable, front of transmission, who knows.. what is it?

-- Joe

 

Sorry, this is on a 1996 collector edition corvette. The VSSensor is pressed fitted into the side io the transmission. Located just beside the front part of the drive shaft. To get to it you need to take off the cross frame which is after market for reducing frame flexing making the cars suspension more rigid. The sensor is just above the centre of the cross frame. Prior to replacing sensor I had a small leak (transmission fluid) no noise. Soon as i backed it out of the garage and started pulling away you couls hear a whining or ticking noise. The faster you go the louder it gets. Put car back on hoist started car and put a mech. stethesope on sensor and can here the noise. Any idea what the problem might be.

Again thanks

 

The VSS (Vehicle Speed Sensor) is at the rear of the transmission. There is a single small bolt that holds a retainer. Then the VSS just slides out of the side of the tranmission tail shaft housing against the moderate resistance of the "O" ring. Cross member? Is this a convertible? A little info can go a long way. Either you have miscommunucated with the mechanic or he is a crook.

I am trying to visualize how the VSS could be noisy. The VSS has but one moving part and that is the shaft the speedometer driven gear turns. Other than spinning in the VSS housing, that shaft touches nothing. The only causes of noise that I can imagine, would be by the installation of the wrong VSS or the VSS was incorrectly installated.

RACE ON!!!

 

I don't what is involved in removing your "cross frame" but I can't imagine its very difficult. After that, as others have mentioned, it takes probably less than 5 minutes to remove the VSS. Sounds like you need a new mechanic or you need to learn to turn your own wrenches.

 

I could be wrong but I don't think the 96 sensor even has the shaft for a gear, I think it is more like a wheel speed sensor, if it is making noise it must be touching the tone wheel or reluctor. As everyone else indicates something doesn't sound right with your mechanic, these sensors are not difficult to replace. The frame brace must be be a doozy.

 

Probably a combination of it's location and the exhaust.

-- Joe

 

You were correct it is like a wheel speed sensor and it appears that it was touching the tone wheel, replaced sensor. the problem taken care of. thanks for your help. The first sensor appears to be defected. No problem in replacing the second sensor. ist one which was the original one came out in pieces, that is why it took so long. again thanks for your response.

 

Happy to hear you got it repaired, glad it didn't damage the tone wheel.

 

Of course, you are right. When I clicked on "Post a Reply", the post, now above my last post, didn't exist. The OP had given no clue as to the year, body style, or transmission. When you are forced to fly blind, you respond with what you are familiar with. My reply applies to all C4s except 1994 and up automatics. Murphy's law prevails, once again.

RACE ON!!!

 

understood! It would be so much easier to help if everyone would just post the year/transmission etc. in the first message or at least fill out their profile.

 

And especially when you have a poster that appears clueless with comments like, "Sensor is front of transmision,". And then continues to say, "mech. had to drop x cross suspension just to get at it.", while all along, he knew full well that he had an after market cross member, that he neglected to disclose. My crystal ball is still in the shop.

RACE ON!!!

 

I just had the exact same issue but I replaced everything in the rear end. Me and my dad then climbed back under and narrowed it to the sensor. I replaced it 2 years ago and it just started making this whining noise. We tightened it up and no noise!

 

I have the same issue right now. I had the bearing growl/whine type noise, heard from under center of vehicle while driving, only when cold, from 1 to 25 mph, forward and reverse, also small trans leak for a long time. 95 C4, LT1, 4L60E. I have limited places to put car in air. Anyway I was able to put in air, found loose Transmission Speed sensor hold down bolt. removed sensor, found witness marks on speed sensor and on teeth of reluctor wheel in trans. So I cleaned everything up, oring still looked good, reinstalled and drove. all seemed ok.
The next morning when vehicle was cold, drove and noise still there. Then replaced with a new VSS. I saw two different designs when ordering. There was one with just a pole and another with a magnet looking design. Since it was the magnet design I took out, that is the one I installed. Now, same thing, only now it makes the noise about 80% of the time driving it. Loudest at 1 to 25 mph. Now it does it hot or cold. So the new sensor made to noise louder and more often.
I tried searching the internet for any issues with the reluctor wheel moving on a 4L60E output shaft, or if tailshaft bushing wornout could cause the ruluctor wheel to rub against the speed sensor. I just wanted to check in with the people on this forum before taking the extension housing off as I have limited places to do this repair, I live in an apartment with no garage. Before back surgery I was a Ford dealer master tech for 29 years so I have tried to answer every possible question one could have in the long forum writing. If someone would prefer to email me directly that is fine or even speak on phone. I do live in San Diego, Pacific time zone.
Thanks for any assistance you can give. Scott

 

Removing the extension housing under the conditions you describe will be extremely difficult, find a Corvette specialty shop and save yourself serious aggravation. I've done this on a lift in my shop with all the tools and it is not easy.

 

Interesting. Could someone explain to a tranny newbie exactly what is making the noise that can actually be heard in the cockpit of the car, and why? And what is a "tone wheel"???

I've never heard of this before this thread.

Jim G

 

Tone wheel or reluctor is used for the VSS to pick up the signal vs a mechanical gear on the output shaft. If the reluctor becomes loose and gets misplaced on the outbut shaft the VSS will actually contact the reluctor creating a "whir" so to speak.



These are from a 4l60e similar to the '94+ Corvette C4

 

That helps a lot, WVZR-1. It is amazing to me that the sound created by these small pieces can be loud enough to be obnoxious inside the cockpit.

But, in your photo, which piece is the reluctor ?

Is this used on all auto trans Corvettes? Reason for aksing is I don't recall seeing anything that looked quite like your photo on my 1992 when they had the VSS and gears out during my ring and pinion change project.

Jim G