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92stockbird
08-11-2014, 10:38 AM
When I traded the 92 sc for a 94 F150, the speedometer didn't work. Replaced the speedo for a 145 MPH unit and gears with the better ones from Bill Evanoff. Still doesn't work. 92 M5R2 is in need of a rebuild, so I got a used 94/95 M5R2 from Ryan at the sc shop, and had it put in. I was hoping the speedometer, and odo might work. They don't.
My question is: What is the usual cause of failure? The sensor in the trans, or maybe the schematic on the back of the gauges, or something else? Does the 95 M5R2 trans work with the 145 MPH speedo? I have tried 3 different gauge clusters, with the same results.

Thank you,
Jim JOHN 3:16

90tbird4.7l
08-11-2014, 12:02 PM
sounds like the speed sensor in the tail of the trans is bad

S_Mazza
08-11-2014, 01:28 PM
sounds like the speed sensor in the tail of the trans is bad

Quite probable.

Or the gear on the end of it could be worn out.

Or a loose / corroded plug under the car.

Does cruise control work?

92stockbird
08-11-2014, 04:02 PM
Quite probable.

Or the gear on the end of it could be worn out.

Or a loose / corroded plug under the car.

Does cruise control work?


No. Cruise never worked either.

S_Mazza
08-11-2014, 05:35 PM
If cruise never worked, then I think it's probably the VSS or wiring. I would look at the plug on it and go from there. The VSS is not hard to remove from the trans.

92stockbird
08-11-2014, 10:08 PM
If cruise never worked, then I think it's probably the VSS or wiring. I would look at the plug on it and go from there. The VSS is not hard to remove from the trans.

What is the vss? Where is it located exactly?

Thank you,

Jim JOHN 3: 16

S_Mazza
08-11-2014, 10:28 PM
The vehicle speed sensor bolts into the side of the transmission, near the back. There's a plastic gear on the end that meshes with a metal gear inside the transmission.

This page shows an auto, but manual should be similar.

http://www.justanswer.com/ford/3boct-ford-thunderbird-1997-speed-sensor-v6.html

92stockbird
08-13-2014, 12:30 PM
The vehicle speed sensor bolts into the side of the transmission, near the back. There's a plastic gear on the end that meshes with a metal gear inside the transmission.

This page shows an auto, but manual should be similar.

http://www.justanswer.com/ford/3boct-ford-thunderbird-1997-speed-sensor-v6.html

Where can I get a new sensor for the 95 m5r2?

Thank you,
Jim JOHN 3:16

S_Mazza
08-13-2014, 02:11 PM
The normal parts stores should be able to get them. It's a common sensor.

http://shop.advanceautoparts.com/p/bwd-vehicle-speed-sensor-s8058/20474678-P?searchTerm=vehicle+speed+sensor#

P.S. - I would look it over before ordering one. Maybe you need a gear, which is not included with a new sensor. Or maybe it's just unplugged, or a wire got pinched.

Les Borda
08-13-2014, 06:17 PM
FYI they size that gear by diff ratio so speedo is on track.

92stockbird
08-13-2014, 06:29 PM
FYI they size that gear by diff ratio so speedo is on track.

What gear ratio does the 92 sc have? 2.73:1? Or is there a tag on the dif. cover that would tell me?

Thank you,
Jim JOHN 3:16

Les Borda
08-13-2014, 06:40 PM
I think there is supposed to be a tag on the diff cover. I didn't know they still did 2:73's in 92 my 90 XR7 had that ratio.

KMT
08-13-2014, 06:43 PM
You should be able to decode the axle ratio from the door tag (assuming it hasn't been changed out, etc.). See: http://www.35thatr.org/VINCodes/tb_ax.htm

Les Borda
08-13-2014, 07:04 PM
smart azz..:D