Wrong fluid in T-Case

[rwmorrisonjr]

Going to change the transfer case fluid out this weekend, and the shop that did it previously used 75W-140 gear oil instead of Mercon LV. Is there anything I should look for or do to get the gear oil out before filling with Mercon?

 

[JExpedition07]

......... why in the world did they do that? Gear oil does not belong with those clutches and they had to know they drained transmission fluid out.

 

[rwmorrisonjr]

......... why in the world did they do that? Gear oil does not belong with those clutches and they had to know they drained transmission fluid out.

Because they’re idiots and I didn’t catch it when they did it three years ago. They did the same thing for the front diff.

I’ll know for sure when I drain it this weekend.

That said, is there any way to flush the oil residue out before I refill it? Will I damage anything if I just refill with ATF?

 

[07navi]

Because they’re idiots and I didn’t catch it when they did it three years ago. They did the same thing for the front diff.

I’ll know for sure when I drain it this weekend.

That said, is there any way to flush the oil residue out before I refill it? Will I damage anything if I just refill with ATF?

I would just put atf in it it will be fine. You can't get all that out anyway without dissembling it

 

[07navi]

I would just put atf in it it will be fine. You can't get all that out anyway without dissembling it

Many old t cases took that heavy oil so they just ASSUMED !

 

[rwmorrisonjr]

I would just put atf in it it will be fine. You can't get all that out anyway without dissembling it

Thanks. That's what I thought, but wanted to make sure. Luckily I run it in 2H 95% of the time, so the clutches aren't engaging much.

Gotta love correcting stupid mistakes. That's why I'm back to doing my own work again.

 

[rwmorrisonjr]

Many old t cases took that heavy oil so they just ASSUMED !

Probably, but Ford lists Transfer Case fluid for the ESOF and Mercon LV for the torque-on-demand T-cases.

I suspect they were just being lazy.

 

[ExplorerTom]

Are you sure it takes Mercon LV?

Pretty sure my manual says it takes XL-12 fluid.

 

[JExpedition07]

My 2007 is straight Mercon for the transfer case and Mercon SP for the trans. 09+ should be Mercon LV.

 

[rwmorrisonjr]

From the manual: ESOF takes XL-12 Transfer Case fluid, torque-on-demand takes Mercon LV.

 

[Dave814]

From the manual: ESOF takes XL-12 Transfer Case fluid, torque-on-demand takes Mercon LV.

From the information I have gathered the XL-12 has been discontinued and LV is to be used in its place. I was having a hard time locating the XL that’s when I discovered the change.

 

[rwmorrisonjr]

Well, I drained the t-case and Mercon LV came out! Guess the previous shop just coded it to 75W-140 for ease of billing. Dodged a major bullet on that one!

Sadly, I sheared off a pan bolt on the transmission from over torquing, but that’s another thread!

 

[Bob Lewis]

From the manual: ESOF takes XL-12 Transfer Case fluid, torque-on-demand takes Mercon LV.

Definitely do not use MERCON V. It will eat up any plastic parts in the Transfer Case. I put ATF in my 2003 and 2004 XFER Cases.

 

[07navi]

Definitely do not use MERCON V. It will eat up any plastic parts in the Transfer Case. I put ATF in my 2003 and 2004 XFER Cases.

Nah

 

[Turbo Tuna]

From the information I have gathered the XL-12 has been discontinued and LV is to be used in its place. I was having a hard time locating the XL that’s when I discovered the change.

I am having the same issue locating the XL-12. Where did you get that information? I am worried that LV will damage the transfer case.