TF 999 ??

[Shawn]

Does anyone know which line coming out of the TF 999 is the pressure line and which is the return line?

1986 CJ7

Thanks,

 

[Shawn]

Tuff question eh??

Oh well,

 

[BCGPER]

Ok, the one that's hotter than the other is the pressure side.......




Glad I could help!




(Honestly, that's how I always check)

 

[RockMonkey]

I think the top one is pressure, and the bottom one just returns fluid to the pan.

Does it matter?

I don't think either line is under enough pressure to require a hard line, or anything. Attach the top fitting to the top fitting on the cooler, and the bottom fitting to the bottom fitting on the cooler. I don't recall ever spending much time worrying about which direction the fluid was flowing. Maybe I've completely screwed things up/or gotten extremely lucky, though.

 

[Shawn]

I think the top one is pressure, and the bottom one just returns fluid to the pan.

Does it matter?

I don't think either line is under enough pressure to require a hard line, or anything. Attach the top fitting to the top fitting on the cooler, and the bottom fitting to the bottom fitting on the cooler. I don't recall ever spending much time worrying about which direction the fluid was flowing. Maybe I've completely screwed things up/or gotten extremely lucky, though.

I want to flush the tranny. If I do it the same way as I do my Ram:
Remove the pan and drain.
Install new filter
Fill tranny with new fluid
Disconnect cold side of return line and run to a bucket
Start the Jeep and watch the fluid color
Stop Jeep add fluid
Start again and watch fluid
When fluid color changes to a cleaner color reconnect line and top off.

Thanks,

 

[RockMonkey]

Got it. So yeah, in this case it matters...

I'd go with Brian's method.

 

[RockMonkey]

If you disconnect either line from the cooler, fluid will either come out of the cooler or out of the disconnected hose, and for flushing purposes it doesn't really make a difference. So disconnect the easiest line to get to and run the line to a bottle/bucket/whatever. Attach a spare bit of hose to the cooler, and run it to a bottle/bucket/whatever. One of them is going to suck air, and the other is going to spit old fluid.

Once you figure out which is which you could even immerse the sucking hose in new fluid and let it power flush itself.

*this entire post is conjecture and hypothesis

 

[UNSTUCK]

By accident I found out that my 700r4 was pressure on top. That's because a fitting came loose one time and shot fluid across my garage and stained the wall. I guess you just take the fittings off and run it. You'll know real fast.

 

[Tacoma]

Ok, the one that's hotter than the other is the pressure side.......




Glad I could help!




(Honestly, that's how I always check)

Also the way most manuals say to find out. I've got a manual for the later Dodge transmissions, if they didn't change anything it'll be what that says... when I go downstairs and look.

 

[neagtea]

The rear one should be return.
50/50 chance.

 

[4x4_Welder]

With both disconnected, one won't be sucking air, it won't be doing anything since it's just a return. I have used the both lines into a bucket method with good success in the past on GM transmissions, that should work well here too.
In an auto trans, 5gallons goes by pretty fast, and you may have to have it in neutral to get it to pump fluid through the torque converter.

 

[Bart]

By accident I found out that my 700r4 was pressure on top. That's because a fitting came loose one time and shot fluid across my garage and stained the wall. I guess you just take the fittings off and run it. You'll know real fast.

Had that same thing happen on my last buggy. The barbed pressure fitting didn't handle the pressure as well as it should have.