Correcting Speedo after Wheel change.

Wrencher said
Please educate me? Im sorry but Im not sure what I have. I'm 6'6" 370lbs+ so I dont exactly fit under the car for long periods of time to do these types of inspections =P~
I've not even fixed adjusted the T.V. linkage yet after my 2BBL retrofit because its such a P.I.T.A. to get under it.

Im guessing that you are referring to the way the driveshaft hooks up to the output shaft?
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If your speedo gear looks like this and your drive shaft is bolted to your transmission. you have a pre 1966 transmission and you cannot use the charts provided above. and good luck finding a gear.

if you drive shaft slips into you trans and the gear has a metal shaft coming out of it your ok and you should not have too much trouble finding a gear.