Leak Between Transmission and Transfer Case

[reulew]

2010 Ranger M5R1/BW1354 Leak Between Transmission and Transfer Case - Looking For Correct Seal Part Numbers

I'm chasing a leak on my 2010 Ford Ranger and am hoping someone who's been through this can help me identify the correct seals before I pull the transfer case.

The leak appears to be coming from the area between the transmission and transfer case. The underside of the transfer case is wet, but I haven't definitively proven whether the source is out of the manual transmission, out of the transfer case, the seal between the housings, the shift rail plugs on top of the transmission??

The biggest problem I'm running into is conflicting part numbers depending on what I'm looking at.

I've found references to:

Transmission output seal:

• E8TZ-7052-D (listed in one M5R1 parts breakdown as "Output Seal - 4WD")
• 1L5Z-7052-CA (appears to supersede E8TZ-7052-D in some catalogs)
• AE8Z-7052-D (seems wrong and appears to be for newer transmissions)
• 1L2Z-7052-AA (many sources show this as automatic-transmission only)

Transfer case input seal:

• F3TZ-7B215-A
• 3L2Z-7B215-AA
• National 710403 (cross references to several of the above numbers)

There is also a gasket between the two housings which I'm pretty sure is E9TZ-7086-A.

A few questions for anyone familiar with the M5R1/BW1354 combination:

1. What is the correct current Ford part number for the M5R1 4WD output seal?
2. What is the correct current Ford part number for the BW1354 input seal?
3. How common are leaking shift rail plugs on the M5R1?

Any part numbers or firsthand experience would be greatly appreciated. I've been looking through parts catalogues and exploded diagrams for many hours now and its time to phone in for help.

 

[Curious Hound]

I've never looked up those part numbers. So I can't help there. From what I've read over the years, the shift rail plugs are a common leak point.

I would recommend that you clean everything up real good with degreaser or brake cleaner. Then watch to see where the leak reappears from.

 

[lowspeedpursuit]

You are massively overthinking this. If you're listing a National part # presumably you're cool with aftermarket. Go on Rockauto and buy whatever they have from a reputable brand. Or go wherever and buy an entire seal kit; they're $20 each.

Extension housing is dry. The paper gasket between it and the tcase isn't part of your leak. The rubber shift rail plugs have a reputation for leaking regularly.

 

[85_Ranger4x4]

Extension housing is dry. The paper gasket between it and the tcase isn't part of your leak. The rubber shift rail plugs have a reputation for leaking regularly.

And they would be leaking from the top of the transmission.

I've never been around a R1 but my M5ODR2 (slightly scaled up version used in the F-150) actually has a drain channel. If the seals between the trans and t-case are bad it would be leaking from there, not the top of the transmission.