AOD speedo gear help

[JohnVH]

Hi all, I thank you for the help in advance,

I did a trans swap in my '93 and put a '89 aod in, I switched the trans speedo gear as it was different, but my speedo is 15mph fast at 60, and 5 fast at 25. Is there anywhere I can fix this, or what is my best option costing the least?

 

[larrendeuce]

Try a 23 tooth speedo gear. It should be closer then the 93 trans with the same gear.

 

[JohnVH]

Oh ok, can I still order these from FORD?

 

[timewarped1972]

what rear gears are you running in your 93??

 

[larrendeuce]

Oh ok, can I still order these from FORD?

Wait I just read your sig, I thought you had 4.10's and were having problems.
In which case I have the same question as timewarped1972 what gears?

 

[bill302]

Automatic Transmissions with 7 Tooth Drive Gear

1983-1989 Automatic Transmissions
2.73 Gear Ratio / Blue 16 Speedo Gear
3.08 Gear Ratio / Gray 18 Speedo Gear
3.27 Gear Ratio / Tan 19 Speedo Gear
3.55 Gear Ratio / Orange 20 Speedo Gear
3.73 Gear Ratio / Purple 21 Speedo Gear
4.10 Gear Ratio / White 23 Speedo Gear

click on link below for more info. or to order speedo gears...

http://www.steeda.com/store/-catalog/speedometer.htm

 

[JohnVH]

Hi, Sorry for the late reply, didnt get a notice of any replies.. the 93 has the stock rearend so Im not sure... its a aod car stock so I have no idea.. BUT, I do know it has a blueish green speedo gear in there now.... This is the gear that came with the trans from the 89 car.

 

[jrichker]

The stock range of speedo gears work correctly with a limited range of tire sizes.

See http://www.corral.net/tech/gearcalc.html for more help

Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.

See http://www.gaugeguys.com/ratioadapt.htm for more info.

 

[JohnVH]

Very cool, thanks!