transmission that been change

[khc49]

I have 55 t-bird that has a 3 speed with overdrive

I put a trans out of a 55 fairlane its a top loader

now the speedometer reads about 10 to 15 mph fast

I think that the rear end ratio much be different

dose any one know the ratios of the rear end that was used in 1955 by ford

hoping I can have converter made to correct the problem

kyle

 

[gbhrps]

kyle,

Many Ford products used the same trannies for all years, and I suspect that your gear drive for the speedometer has the incorrect number of teeth.

There are 4 different speedometer gears for 55-57 small birds, each having 19, or 20, or 21, or 22 teeth. I suspect that you require a different one than you presently have installed. Pull it, count the teeth, and then call the following guys at Hill's Thunderbird Center. 740-949-2217 and ask for Technical Information. These guys should have an answer for you.

They list these gears at $21.95 to 27.15 in their 2011 catalogue.
Good Luck!

 

[paul2748]

If you have the old trans, pull the gear out of it and put it in the new trans. They should be the same except for the number of teeth.