The Ford Barn

Angledrive · 06-11-2016, 04:40 PM

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

1931 flamingo · 06-11-2016, 05:17 PM

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

Angledrive · 06-11-2016, 05:46 PM

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

Mike V. Florida · 06-11-2016, 11:50 PM

According to a truck forum (the T150 was used by Ford late 70's to mid '80's) 75W should be fine behind an A motor.

Jim, Nashville · 10-29-2016, 09:48 PM

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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.

06-11-2016, 04:40 PM	#1
Angledrive Senior Member Join Date: May 2010 Location: Lakeland Florida Posts: 303	Transmission Oil Question 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

06-11-2016, 05:17 PM	#2
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,390	Re: Transmission Oil Question 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

06-11-2016, 05:46 PM	#3
Angledrive Senior Member Join Date: May 2010 Location: Lakeland Florida Posts: 303	Re: Transmission Oil Question 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

06-11-2016, 11:50 PM	#4
Mike V. Florida Senior Member Join Date: May 2010 Location: South Florida Posts: 14,054	Re: Transmission Oil Question According to a truck forum (the T150 was used by Ford late 70's to mid '80's) 75W should be fine behind an A motor. __________________ What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II

10-29-2016, 09:48 PM	#5
Jim, Nashville Junior Member Join Date: May 2010 Location: Nashville, TN Posts: 10	Re: Transmission Oil Question Sponsored Links (Register now to hide all advertisements) 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.