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Change in Speedo Reading - How to solve 

 

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 Post subject: Change in Speedo Reading - How to solve
Posted: Thu Jan 24, 2013 1:04 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

G'day people,

Has anyone got a solution for this problem?

3 days ago I removed a problem Auto Trans box from the AUII and replaced same, I believe it could have been AUII or AUIII.

The original gearbox speedo reading at 100kph, on the GPS the reading was 95kph.

With the replacement gearbox, the speedo at 100kph , on the GPS reads 105-107kph.

Where would this problem be and how to rectify

Cheers
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Thu Jan 24, 2013 6:05 am 
Getting Side Ways
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Ride: BA MK11

Location: West Melbourne
VIC, Australia

Put your original gear in the new box.

 

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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Thu Jan 24, 2013 11:37 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

kwaussiekid,

Thanks, good idea, never thought of that at the time, unfortunately its now at a transmission joint with new parts installed. April is pick up.

Correction to the vehicle it came from.

The replacement gearbox came out of 2001 Ford Fairlane sedan with 209,000 klms on the clock

Cheers
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Fri Jan 25, 2013 11:34 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

Is there only one way to connect the cable from the speed transducer?

The holes and plugs are triangular shaped. Maybe the cable was connected the wrong way and under reads, the original over read.

Car Speedo at 55kph Reads 60 kph on GPS
"" "" 75kph " 80 "" ""
"" "" "" 95kph 100 "" "" GPS

Cheers
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Fri Jan 25, 2013 11:48 am 
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

it only plugs in one way..

you need to change the gear on the speedo sender..
you said the box came from a fairlane.the fairlane will have 3,45 diff ratio where your car will have 3.08 or 3.23 ratio. so the box from the fairlane has a speedo gear for 3.45 ratio..hence why the reading is incorrect
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Fri Jan 25, 2013 11:52 pm 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

Troyman,

Thanks mate, I did not realise the difference in diff ratio between AUII and Fairlane , that would explain the readings I have.

To change the gear on the speedo sender, do I need to remove the rear extension housing where the speed transducer is located?

Cheers
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Sat Jan 26, 2013 7:35 am 
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

no, just need to unscrew and remove the sender from the extension housing and unclip the gear from the sender ans re fitt the right gear,,
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Sat Jan 26, 2013 7:39 am 
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You can pull the transducer without pulling the box. Don't take the extension housing off. It can be a little tight if you have big hands and do it when the car is cold as you will burn yourself on the exhaust. If you have trouble getting to it you can drop the gearbox mount and tilt the motor and box down a little but you shouldn't need to do that. Much easier if you can access a hoist.
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 Post subject: Re: Change in Speedo Reading - How to solve
Posted: Sat Jan 26, 2013 11:49 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

Thanks Troyman and SWC,

Much appreciate your advice.

Neighbour has a hoist, will have a yarn to him when he gets back from Phillip Island.

Cheers
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