96 GT speedometer quit, OD light flashing

robg860 · Nov 27, 2005

Hey,

this weekend my speedo quit only 1 day after my gears were installed. I lost overdrive with the speedo now sitting at zero all the time. I was told that it was a speed sensor and a pretty easy fix. My car is a 1996 GT.Does this sound right??? I thought it may be a coincidence and not gear related as it did work a full day. The check engine light and OD indicator light both flash now. Going to a tranny shop tommorrow to get it fixed hopefully. Anyone else had this issue????

COramprat · Nov 27, 2005

What did you use to adjust the speedo for the gears?

85 Coupe 5.0 · Nov 27, 2005

robg860 said:
Hey,

this weekend my speedo quit only 1 day after my gears were installed. I lost overdrive with the speedo now sitting at zero all the time. I was told that it was a speed sensor and a pretty easy fix. My car is a 1996 GT.Does this sound right??? I thought it may be a coincidence and not gear related as it did work a full day. The check engine light and OD indicator light both flash now. Going to a tranny shop tommorrow to get it fixed hopefully. Anyone else had this issue????

Sounds like a speed sensor all right. You still need to correct the speedo for the gear install, especially with the fully-electronic automatic 4r70w that's in that car. That tranny's shifts are competely controlled by the PCM via various sensor inputs, one major one being the speed sensor. If the speed sensor is inputing an incorrect signal because of the gear swap without the proper speedo gear being installed it will cause incorrect shift timing and various other driveability problems.

Get the code ran (that's why your O/D light flashes) and get the correct speedo gear installed.

robg860 · Nov 27, 2005

the speedo gear was installed, at the time of the gear change and seemed to read maybe a little bit fast from my initial impressions. Will installing a new speed sensor fix it. The first 3 gears still shift true to form, I just have no OD.

COramprat · Nov 27, 2005

The gear doesn't give you an acurate speedo reading. You would be better to get a speedcal as soon as you can. Or have a chip installed to fix it.

I'm not sure if the code reader will tell you which speed sensor may be bad if that is the problem but give it a try.

tangerine96gt · Nov 27, 2005

My speedometer quit and my OD light flashed when i hooked the DM speedcal up. Then my CEL came on and showed VSS malfunction. Everything was hooked up correctly to. What's up with that? Bad speedcal or connection?

I still could use OD with it flashing

StangIt #1 · Nov 28, 2005

Sorry to high-jack this thread, but is the tachometer also on a sensor? The tach doesn't work on my '98GT, and it drives me crazy to see it pegged at "0" all of the time! Thanks! :OT:

1LowGT · Nov 28, 2005

Steeda told me that changing the speedo gear in a automatic trans will not last due to the fact that the size difference and angles of the new gear and he also said it wont be accurate if gears larger than 3.55 are used

MyEarsHurt · Nov 28, 2005

subscribing, i dont want this problem when i install my gears in the spring. Would it be better to get a chip or a speedcal? Which will solve the problem in a 96-98 auto?

COramprat · Nov 28, 2005

In ANY car I would just go with having the computer flashed, a chip/tuner, or the speedcal. The gear is not accurate (mine was off 10%) and tears to pieces in about 6 months in ANY car.

rebelleader · May 19, 2006

Back from the dead...........

My O/D light just started flashing for no apparent reason. O/D still works, but the light continually flashes. My only recent mod was an X-Cal2.

Mike97gt · May 19, 2006

rebelleader said:
Back from the dead...........

My O/D light just started flashing for no apparent reason. O/D still works, but the light continually flashes. My only recent mod was an X-Cal2.

that could be just about anything, does the tranny shift normal? get the codes pulled and post them here so we can try and help

rebelleader · May 19, 2006

Tranny shifts just fine. I will pull the codes tonight.

rebelleader · May 19, 2006

Before I ran into work I hooked up my X-Cal 2 and I had one DTC: P0782

X-Cal 2 doesn't give a description so any help would be appreciated.

Thanks.

Disturbed One · May 19, 2006

rebelleader said:
Before I ran into work I hooked up my X-Cal 2 and I had one DTC: P0782

X-Cal 2 doesn't give a description so any help would be appreciated.

Thanks.

Searched: P0782 2 to 3 Shift Error.

rebelleader · May 20, 2006

Disturbed One said:
Searched: P0782 2 to 3 Shift Error.

Thanks for the help. I took the X-Cal tune off and reflashed my computer back to stock. I will see if the code comes back.

Thanks again.

nyuk98gt · May 21, 2006

rebelleader:

Call your tuner and tell them about the code error. They can (and should) fix it!

Chris

rebelleader · May 21, 2006

nyuk98gt said:
Call your tuner and tell them about the code error. They can (and should) fix it!
Chris

Thank you, I will call them in the morning.

nyuk98gt · May 22, 2006

rebelleader:

Pardon if my post sounded terse. The auto trans can't be fixed "externally" since it is completely controlled by the PCM. So, adjustments to shift and lock/unlock points can only be made via the tune. That's why I referred you back to your tuner.

Let us know how you make out with this.

Chris

rebelleader · May 23, 2006

nyuk98gt said:
Pardon if my post sounded terse....

Your post was fine. Thank you for your help. I will post up when the problem gets resolved.

EDIT: I just called MustangTuning and got a voicemail for Tech Support. I left a detailed messae and my phone number. I hope they give me a call back.

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