Flushing '51 Ford Overdrive

[Roger W Gerow]

My goal is to flush out the tranny and O/D unit. There is one drain plug for the tranny, none for the O/D. Do they share a common area? Does that drain plug drain both units? Going to use diesel to flush with, then put in new lubricant.

[toby]

There should be two drain plugs on the overdrive tranny. From the 1949-1951 Ford Shop Manual:
" For transmissions equipped with overdrive, drain at two plugs. Refill through transmission only. Refill capacity with overdrive is 4 1/2 pints of SAE 80 or SAE 90 in warmer climates."

[Mike51Merc]

Originally Posted by toby

There should be two drain plugs on the overdrive tranny. From the 1949-1951 Ford Shop Manual:
" For transmissions equipped with overdrive, drain at two plugs. Refill through transmission only. Refill capacity with overdrive is 4 1/2 pints of SAE 80 or SAE 90 in warmer climates."

Mine only has one drain plug.

[green50]

My '50 ford has a fill for the trans and one for the O/D unit. I fill slowly through the trans., also one drain plug/hole on the trans.

[JT FORD]

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Try this: Unhook the wire at the relay that comes from the ignition switch and tape the connector. Then put a 10 gauge wire from from the starter solenoid to the relay where you removed the switch wire. Test drive and see if it works....