[FC] FC 1964 Powerglide Fluid into Differential

[James Davis]

Well, one of the pinion seals is leaking.  The seals are under pressure on 
the outside (from the Powerglide) and there is no pressure inside the 
differential, so any leak is into the differential. Sad-to-say, it is a 
relatively common problem and the diluted differential grease will soon 
destroy the ring and pinion.  There is no cure except to change the two 
pinion seals. Use only National seals (in my opinion) as they have two seal 
lips and are less prone to leaking, especially on the front pinion 
seal.  If the torque convertor seal was leaking, the transmission fluid 
would simply be slung on the right underside of the FC and would not end up 
in the diferential.
Jim Davis


At 04:25 PM 2/21/05, you wrote:
>Before leaving on trip I changed the fluids on both  the differential
>(Valvoline-Synthetic) and transmission (Synthetic-Amsol) and replaced the
>torque converter seal and front PG pinion shaft seal. I drove 1800 miles
>checking the fluid levels along the way. Upon a routine check at 1600
>miles I noticed a drop in PG fluid and upon checking the diff dipstick
>the PG fluid was entering the differential and overfilling it causing the
>fluid to come out the top diff breather.  I was able to add trans fluid
>to get me home.  What could be my problem ?
>
>John Policella
>1964 Greenbrier
>Margate, FL
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