speedo gear

Well we actually need more information to tell you exactly what gear you need but you can figure it out.

83-89 manual tranny Red 21 tooth gear
83-89 auto tranny Purple 21 tooth gear
90-95 manual or auto tranny White 23 tooth gear(jeep part)

egan_gt said:

I am a parts manager @ a Chrysler dealership..so if i could get a part#.. i could get a good deal on it. thanks

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I think the part is only $8.00

http://www.mustangforums.com/m_201146/tm.htm

50resto.com says the Red 21 tooth will work.
http://secure.50resto.com/product1.cfm?SID=1&Product_ID=226&Category_ID=145

I've always read that the Jeep part will work best.

The ultimate solution is to replace the drive gear. (Inside the T-5)
http://secure.50resto.com/product1.cfm?SID=1&Product_ID=1056&Category_ID=145

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.

This site may help too....

http://www.geocities.com/mgnedell/notchback/tech/speedo.html

egan_gt said:

1986 Mustang, 5.0l, 5spd Manual.. Hope That Helps

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You need the red 21 tooth gear.