Transmission Oil Question

Angledrive

Angledrive

Senior Member
I have a Hobby Shop members Model A in my garage for a repair. It was broadsided and broke transmission off bell housing. Trans is a T170 4 speed overdrive that was modified to bolt to bellhousing and torque tube. I have it all back together and would like to know what gear oil to put back in. Member said it was a 50/50 mix of STP and gear oil. What gear oil should I put back in the transmission for best performance. Thanks
 
I would think what ever Ford recommended for the T170. Not being smart. But I'm sure they researched what was best and not some home brewed mixture.

Paul in CT
 
I called a good friend at Ford dealership and they couldn't give me a definitive answer. I'm thinking 90w GL5. Don't know why they added STP
 
The overhaul manual for the T170 trans. calls for "Full Synthetic Manual Transmission Fluid". Ford sells it under the Motorcraft brand and I get it at the local Ford dealership. However I know several folks use 90 wt. fluid and it seem to work ok, I have noted that the trans. that I have built seem to shift a little better in cold weather with the synthetic fluid.
 
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