LT77 Leaks - Stop Leak Fix - Defender Source
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  #1  
Old January 7th, 2014, 02:54 AM
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Samdford Wallace
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LT77 Leaks - Stop Leak Fix

I have read that LT77's leak a lot. I'm used to the power steering leak on my RRC, but haven't seen any leaks from a transmission like this. I think if I drive it for 30 min and then park, I'll have about 5 drops soon after.

I went tonight to check the transmission level, and found out there is no dip stick. So I think I'll flush it out and put in some new Redline MTL tomorrow.

Is there anything I can put in as well to slow the leaking? Anyone have luck with transmission leak-stopping products. Normally I'd take it apart and replace gaskets, but I am most likely replacing my LT77 with a R380 stumpy within a year. I'd just like to keep it going until then.

Also, how often do you think I should be topping off the LT77 with more transmission fluid?
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  #2  
Old January 7th, 2014, 03:18 AM
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Holy shit. Are you trying to set a record for the most new threads created in an hour?
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Old January 7th, 2014, 03:24 AM
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Did I win?
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Old January 7th, 2014, 04:52 AM
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Quote:
Originally Posted by chris snell View Post
Holy shit. Are you trying to set a record for the most new threads created in an hour?
It is his namesake, afterall
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Old January 7th, 2014, 06:26 AM
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Old January 7th, 2014, 07:23 AM
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I've never had an LT77 leak. You need to see where it is coming from and fix it. It might be the transfer case as well. They have more places to leak. I would not get too exciting. Sometimes it looks like these things are leaking a lot and it is actually quite slow.
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Old January 7th, 2014, 08:22 AM
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Agreed...Edit...lol!

(You post away)
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Old January 7th, 2014, 09:19 AM
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The LT77 should not normally leak.

There are three paper gaskets as well as input shaft and constant pinion seals. There is also an input shaft o-ring.

It's not inconceivable that age and mileage have caused the paper gaskets to wet completely through. If your input shaft seal is starting to leak, that's probably a good sign that it's time to reseal the LT77.
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Old January 7th, 2014, 10:12 AM
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I had a similar problem six months or so into ownership. It turned out to be multiple issues: the transfer case was leaking at the input shaft and intermediate shaft while the transmission was leaking around the output shaft - I had to drop things three times. Once I fixed all of that the transmission started leaking around the extension housing where the previous owner gooped a bunch of sealant to cover the leak. I then replaced the LT77 with an Ashcroft new stubby R380.

In summary, identify the leaks and just keep adding fluid and goop until your R380 arrives.
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Old January 7th, 2014, 11:56 AM
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Hi Dave.

So no one has tried a product like this on an LT77:

http://bit.ly/1lN1OVd
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  #11  
Old January 7th, 2014, 12:05 PM
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Personally, I would think it is a bad idea. Find the leak first and see if you can fix it. Where exactly do you think it is coming from? Have you checked the level in both the gearbox and transfer case yet?
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Old January 7th, 2014, 12:16 PM
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Quote:
Originally Posted by Red90 View Post
Personally, I would think it is a bad idea. Find the leak first and see if you can fix it. Where exactly do you think it is coming from? Have you checked the level in both the gearbox and transfer case yet?
I'll be flushing it today if time allows. I need to spray it down and locate the leak. I was hoping for a quick fix for my temporary transmission. Sounds like everyone here agrees that the only way to go is to fix it properly so I'll plan on going that route.
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Old January 7th, 2014, 12:21 PM
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You might also want to pull off the vent line and make sure it is clear. If it isn't, the transmission will build pressure when it gets hot and push oil out the seals.
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Old January 7th, 2014, 01:06 PM
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Originally Posted by Roadsiderob View Post
You might also want to pull off the vent line and make sure it is clear. If it isn't, the transmission will build pressure when it gets hot and push oil out the seals.
I did not know that was there. I will look for it today. Thank you.
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  #15  
Old January 7th, 2014, 01:19 PM
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If it is ex-MOD, it should have extended breathers, Look for a bunch of 1/4" black tubes end at the top, back of the engine.
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