Transfer case drain plug

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Jan 27, 2025 | 08:00 PM

Boaterguy

Thread Starter

Laughing Gas

Joined: Oct 2014

Posts: 962

Likes: 114

From: Middle TN

Transfer case drain plug

2015 F-250 4X4 PSD 122K miles.

Going to service trans and transfer case again. My retired brain couldn't remember, so I did a little searching for the proper torque values. The older threads seem divided on whether you need thread sealant on the transfer case drain or not. So, whats the latest recommendation from you experts, teflon sealant or no? Also, use on the diff fill plug too?

Thanks in advance.

Jan 28, 2025 | 08:30 AM

apache84

Laughing Gas

Joined: Feb 2014

Posts: 817

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From: KY

I typically use something like permatex selant, teflon tape or something of that nature.

Jan 28, 2025 | 10:27 AM

2015 F-350

More Turbo

Joined: Jun 2024

Posts: 630

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From: Southeastern US

Quote:

Originally Posted by apache84

I typically use something like permatex selant, teflon tape or something of that nature.

I just use teflon tape. Sealant has dried out in the past and worked like LocTite RED - was a nightmare to take out the plug later.

Jan 28, 2025 | 12:03 PM

Antonm23

Fleet Mechanic

Joined: Mar 2023

Posts: 1,587

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Quote:

Originally Posted by Boaterguy

2015 F-250 4X4 PSD 122K miles.

So, whats the latest recommendation , teflon sealant or no? Also, use on the diff fill plug too?

.

They make a special non-hardening thread sealant specifically for oil and gas. Its called gasoila , its available at tractor supply back by where the farm fuel tanks and pumps are, or you can get it from amazon (probably a host of other places online too). I use it on all my NPT threaded oil fittings or plugs, works fanatically well.

...

Jan 28, 2025 | 06:10 PM

Boaterguy

Thread Starter

Laughing Gas

Joined: Oct 2014

Posts: 962

Likes: 114

From: Middle TN

Thanks for the responses. I used a paste PTFE on the threads. No leaks.

Jan 29, 2025 | 05:11 PM

crashz

Mountain Pass

Joined: Apr 2024

Posts: 225

Likes: 85

Just a little warning. I used Teflon tape on a GM transfer case many years ago and I got too crazy on the torque and cracked the case. Be careful and use the right torque!

Jan 29, 2025 | 07:10 PM

Split rims

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20 foot pounds
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Jan 30, 2025 | 07:45 PM

droldsmorland

Fleet Mechanic

Joined: Nov 2011

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From: Land of Taxes

A small amount of liquid pipe PTFE and the German torque spec....goot n tight.

Treat it like a oil pan drain plug. Tight enough to not leak or strip the threads.

Is that 20lb/ft a dry or wet torque spec? It doesn't indicate either.

Remember with any kind of thread sealer tape or liquid you need to back off on the torque 10% on a dry torque spec, so 18lb/ft.

Something this small I just use feel. But Ive had a wrench in my hands for 50 years. My arm is NIST calibrated.