Jager62

I have a 67 mustang with a 390 and a RUG 4 speed toploader. It isn't the original engine or transmission for the car. It originally had the inline 6 and an automatic. It has a different 8 inch rear end also. What i'm curious about is if any of you know what gear i need for the transmission so that my speedometer will be accurate. Currently when i am traveling about 60 on the road the speedometer reads about 10 mph.

Sterling_Six

Hello and good day:

I have a 67 289cc 3 spd that i am, and have been restoring for the last 2 years.

It sounds like a broken or frade cable to the gearing in the Tranny.

Here are a few links I found:

1966 Mustang speedometer problem - Ford Mustang Forums

1967 1968 FORD MUSTANG SPEEDOMETER CABLE WITH 4 SPEED | eBay





Tachometer Repair Restoration for Ford Classic Cars

1968 Ford Mustang

__________________
Good Luck and good repairing Sterling_6
"You know, just like in that Book, When Jesus beats up Moses to get Religion!!"

Jager62

Well, I was told the wire was fine. My friend told me because the speedo wasn't designed for this tranny or rear end, that the gear in the tranny might be turning a different speed than what is required to turn it accurately. Does this seem to hold any truth?

R.S.LOGAN

Agree with your friend , with all the changes and mods the speedo drive ratio / gearing will be miles out of sync with head.

Jager62

Okay. The gears themselves I hear aren't so bad to get, but it's just determining what gearing I need that is difficult. Perhaps there is someone out there with a 390 and a 4 speed toploader and an 8 inch ear end that knows what gear they have? How many teeth on that speedo gear?