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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 08-17-2016
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Transmission ID

I have a 5 speed manual transmission in my 91 Ranger
VIN from door post:

ID tag on transmission:

I have found little info on the transmission but I took note of a post here mentioning that there are Ford transmissions that take automatic transmission fluid.
Can anyone verify for me what fluid I should use in this bucket?
My Hanes manual tells me that I should use 80W for a Mitsubishi and MERCON automatic transmission fluid for the Mazda.

Can anyone tell me which tranny I have?

This forum has been invaluable. I find information here that I can find nowhere else.
I thank everyone here for sharing their expertise.
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Old 08-17-2016
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You have an M5OD-R1 manual transmission(mazda) in a 1991 Ranger, these transmissions were used in Rangers until 2012, last year of rangers

Yes, they use Ford ATF, Fill and Drain holes are on the drivers side of trans, the larger headed bolts.
They have 3 rubber plugs at the top back side of shifter housing, these would crack when they got older and trans fluid would start to leak out.
These plugs can be replaced with metal plugs(like freeze plugs).


AXLE code 84 means you have a 7.5" rear differential, OPEN, not limited slip, and it has a gear ratio of 3.45

3.73 is most common ratio
4.10 is better for towing, but less MPG on highway
3.45 is better for highway MPG, but not as good for towing
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Old 08-17-2016
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I saw the fill and drain plugs and it got me to thinking. I suppose you top it off with a turkey baster? Seriously, they could have made it easier to add fluid.

I saw the article on the bad plugs in the shifter housing yesterday. I have paperwork on the truck that says the transmission was replaced in 2012. I would expect a newer transmission to have good plugs, but there is some fluid on the outside of the casing. On the other hand, it would be good insurance to check it so I don't ruin a (relatively) new tranny.

I try to do my own homework on these things when I can, but I kept going around in circles with the transmission ID.

I had a 72 Torino that had a 2.75 rear end in it. I put a 3.50 LS in it and I almost couldn't drive it on the interstate. 3.45 is good for me. It only has one drive wheel and it is light in the back. I could burn the tires off in a day with this setup.

Thanks for the help!
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Old 08-17-2016
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Ford/Mazda never changed from the rubber plugs, they last well past any warranty periods.

To add fluids to trans these work fine: https://www.amazon.com/Plews-55001-L.../dp/B000BQW5LK

Any auto parts store will sell similar

Trans may have been replaced in 2012 but it would have to be a 1997 or older transmission, to have speedometer cable hook up, 1998 and up don't have the drive gear for speedo cable.
I am sure it was gone thru if a shop did the work.

You're welcome

Last edited by RonD; 08-18-2016 at 10:29 AM.
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Old 08-18-2016
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Just to verify...

Quote:
Originally Posted by RonD View Post
You have an M5OD-R1 manual transmission(mazda) in a 1991 Ranger, these transmissions were used in Rangers until 2012, last year of rangers

Yes, they use Ford ATF, Fill and Drain holes are on the drivers side of trans, the larger headed bolts.


My Haynes manual shows MERCON ATF. Is that the same as the old Ford ATF? I don't want to ruin my transmission because I made an assumption. I have paid for many of those. They can get expensive.

I put ATF in my break master cylinder (High School, Auto Mechanics) because "that's what the teacher said". He was patient with me and showed me how to fix my mistake... going through the break system piece by piece.

In hind site, I can still work on breaks with the best of them.

I appreciate the help, just don't want to pull another bone head play.
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Old 08-18-2016
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Ford no longer makes Mercon, in 2003 Mercon V was reformulated to be backwards compatible for use in Mercon transmissions, including the M5OD-R1
So as long as you get a bottle made after 2003 you are good to go.
But the older stuff didn't hurt the transmission, just seemed harder to shift to some, I never noticed that in mine.

Many ATF brands are Mercon compatible, just look on the label
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