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I've never heard of a c5, but my 82 and 83 broncos have c6 trannys.
The c4 was droped in most of the 2 wheel drives and the c6 was the optional towing and 4wheel tranny. Look at your tranny oil pan and if it's square with a small square notch on it, you have the c6. No notch is the c4. I've never ran across a bronco with a c4 though.
Hope this helps.
82 Bronco 302cu Lariat
83 Bronco 351w (wrecked) parting out, need the money.
[updated:LAST EDITED ON 22-Dec-02 AT 01:35 PM (EST)]:-X12 Thanks alot BroncoRoadKill,I found it ,it was a C6.Ford built four different auto trannys, automatic overhead 4 speed, C-4 ,C-5 ,and the 3 speed C-6.Thanks for your help:+
Go to http://www.advanceadapters.com/index515.html and dl their free PDF catalog. In the automatics section, they mention the years & applications for the C-4, -5, & -6 and the distinguishing characteristics of each.