Question about 1966 Ford Mustang

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How to determine correct tranny from vin number?

After having 66 Mustang Conv restored, found that tranny fitting for speedometer was not reachable. The people who restored it said the numbers called for switching the 4 speed that was in it for a 3 speed, which they did. I am wondering if I was dooped. Maybe this tranny is for the wrong year or something. Is there a difference in tailpiece lengths?

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  • reedyr Nov 13, 2008

    Thanks so much!!! Kudos to all...


  • reedyr Nov 13, 2008




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Hi reedyr,hope this will help you

6F08TXXXXXX 6=model yr F=assembly plant 08= convert body type T= 200cid engine
6 through 11 is a consecutive unit #
not for title or registration

76A F 22 20W 33 2 6
body color trim date dso axle Trans

the 6 in this example is for a dual range automatic (C4) The standard engine and trans for the 66 were the 200cid 3spd. The cruise-o-matic became available with the "K" code and only 5,469 were produced. 289's were letter coded as c, a, or k depending on hp.The 4 spd was an option in 1966 on the 6 cyl and the V-8 retail option price back then for the 6 cyl was$113.45 the V-8 was $184.02 If the 4spd that was in the car was a 66 mustang version it would fit as a well as the old T-10 with the correct lenght of tailshaft, am not certain off hand but I think the over all length is 24" let me know if you need more helpgood luck and ya gotta love a hot rodder

Posted on Nov 13, 2008


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