AX-15 transmission seeping after fluid replacement

TRevs

YJ Enthusiast
Supporting Member
Joined
Oct 25, 2022
Messages
188
Location
San Antonio, TX
I'm still going through the repair/replace/maintenance checklist on my '95, and got to the manual transmission oil last week. The both filler and drain plugs were difficult to remove and I had to buy a 6-point box end and a 6 point socket off Amazon. There were no washers or gaskets on either one; when I replaced the plugs, I used some copper washers from an assortment.

I now have a leak of transmission oil; it only leaks when driving, so it gets blown around on both sides of the transmission case and I'm not sure which one is leaking.

The FSM seems to call for a gasket on the drain plug but nothing for the fill plug.

Should there be a different gasket on the plug, or no gasket at all?
 
My 91 uses a soft aluminum type washer. You could pull the fill and use anything like Teflon tape or paste teflon or permatex type stuff or even RTV on the threads is needed.. Just be careful not to gob mass amounts of stuff on it so it drips off in the trans.
 
Factory uses aluminum washers on both plugs. I don’t know how it was sealed before you touched it without any washers.

83500513 is the part number if wanting to buy them.
 
How much oil did you drain out? Could it have been low enough not to leak? Wash it down with soap/degreaser and take it for a test drive to help locate the source of the leak.
 
How much oil did you drain out? Could it have been low enough not to leak? Wash it down with soap/degreaser and take it for a test drive to help locate the source of the leak.
I didn’t measure the volume of old fluid after draining it, so it could have been low.
 
  • Like
Reactions: Flyer58
Factory uses aluminum washers on both plugs. I don’t know how it was sealed before you touched it without any washers.

83500513 is the part number if wanting to buy them.
Both plugs were on extremely tight; maybe that's how they stopped a leak. :rolleyes:

I put teflon tape on yesterday (white plumbing tape was all I had) and I'll run that while I wait on the washer. Apparently Crown makes the aluminum washer; sites like Quadratec and Summit show them for $0.99 - $1.99, but it's estimated 10+ days before they drop ship from the manufacturer.

Do you replace these every time or reuse?
 
Both plugs were on extremely tight; maybe that's how they stopped a leak. :rolleyes:

I put teflon tape on yesterday (white plumbing tape was all I had) and I'll run that while I wait on the washer. Apparently Crown makes the aluminum washer; sites like Quadratec and Summit show them for $0.99 - $1.99, but it's estimated 10+ days before they drop ship from the manufacturer.

Do you replace these every time or reuse?
Every manufacturer will tell you to replace them but you can reuse them fine. I’ve owned manual Toyotas, Nissans and the Jeep and they’re all the same style flat aluminum washer. Toyota and Nissan both said to replace and Jeep probably does somewhere. I never do.

Once you get the washers, I would remove the Teflon.
 
Not to disagree with anyone but just my experience, I always put a thin layer of permatex ultra copper on the threads of oil plugs like this and it’s never failed me. Everything from cars to boat out drives that are constantly submerged. Even if I have the washer or O- ring seal I still use it.
 
The white PTFE tape seems to have stopped the leak in the fill plug. Hopefully the aluminum washer gasket will arrive within a week.