Tranny Fluid Leaking Into Transfer Case

xtmsports · March 20, 2008

Hi Guys,

I have a 2002 2500HD with 8.1 motor.

The dealer said that I have a slow gasket leak where the transfer case meets the transmission. Transmission fluid is slowly leaking into the transfer case.

Within 5-6 months, the transfer case is going to be filled with tranny fluid and overflow out the overflow vent. This also means that the tranny will be low on fluid.

They want $400 to change that gasket. Is this a fair price or is it something fairly simple that I would be able to do? Does it merele invole removing some bolts and applying a new gasket or will it involve special transmission tools and removal of a bunch of tranny parts?

Thanks

Ptnomore · March 21, 2008

Hi Guys,

I have a 2002 2500HD with 8.1 motor.

The dealer said that I have a slow gasket leak where the transfer case meets the transmission. Transmission fluid is slowly leaking into the transfer case.

Within 5-6 months, the transfer case is going to be filled with tranny fluid and overflow out the overflow vent. This also means that the tranny will be low on fluid.

They want $400 to change that gasket. Is this a fair price or is it something fairly simple that I would be able to do? Does it merele invole removing some bolts and applying a new gasket or will it involve special transmission tools and removal of a bunch of tranny parts?

Thanks

Even though I'm skeptical, if this is indeed happening and you are comfortable removing the transfer case, then you can change the seal. They are probably charging you $350 just to remove and re-install the transfer case.

xtmsports · March 21, 2008

Hi Guys,

I have a 2002 2500HD with 8.1 motor.

The dealer said that I have a slow gasket leak where the transfer case meets the transmission. Transmission fluid is slowly leaking into the transfer case.

Within 5-6 months, the transfer case is going to be filled with tranny fluid and overflow out the overflow vent. This also means that the tranny will be low on fluid.

They want $400 to change that gasket. Is this a fair price or is it something fairly simple that I would be able to do? Does it merele invole removing some bolts and applying a new gasket or will it involve special transmission tools and removal of a bunch of tranny parts?

Thanks

Even though I'm skeptical, if this is indeed happening and you are comfortable removing the transfer case, then you can change the seal. They are probably charging you $350 just to remove and re-install the transfer case.

I've never tried to remove the transfer case nor have I ever worked on anything in the tranny. Is it an involved process to drop the transfer case and replace the seal?

The dealer today just confirmed that the seal is bad and tranny fluid is basically just flowing into the transfer case. They want $495 to replace the seal.

xtmsports · March 21, 2008

Hey guys,

I had the tranny fluid flushed and replaced and that was when the truck started leaking tranny fluid.

Can a tranny flush blow out the seal between the transmission and the transfer case?

sillyazz · March 21, 2008

I would take it to a transmission shop and let them do it will be ALOT cheaper and they should be able to do it in less than an hour. The seal is double seal and its a common problem on these tranfer cases, the seal gets hard and cracks and your transmisson fluid leaks into the transfer case. It not all that hard of a job if you have the right tools , doing it on your back on the ground would suck bigtime.

LtE-36 · March 21, 2008

How can they tell if the seal is bad if you can not visually see it ? MY 03 also has a few drops every now and then ,but its down on the botom of the encoder motor, its red but the tranny and t-case are not low on fluids, I was just curious my extended warranty is out in a few thousand miles, dealer has been no help.

Jim

Also have not found any pin holes in the t-case.

sillyazz · March 22, 2008

How can they tell if the seal is bad if you can not visually see it ? MY 03 also has a few drops every now and then ,but its down on the botom of the encoder motor, its red but the tranny and t-case are not low on fluids, I was just curious my extended warranty is out in a few thousand miles, dealer has been no help.
Jim

Also have not found any pin holes in the t-case.

Your tranfer case will be way over full. Something else must be leaking if your seeing drops of fluid , if its still under warranty I would take it back and make them fix it.