My NP208 is leaking at the case half. I really don't want to have to pull it and separate the case halves and reseal it. I suppose I will if I have to, but before I do... Has anyone tried any type of auto trans "stop leak" or "whatever fix in a bottle" for a leak like this in a t-case?
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
NP208 Leaking
- Thread starter 496truck
- Start date
07coupegt
Registered Member
I wouldn't waste time with stop leak. When I did the case halves on my 241, I didn't remove the case. I just unbloted the rear halft with it still in the truck
My '82 is oozing ATF out of the case halves too.only about a quart a year or so..been thinking of adding some LUCAS or similar stuff to it to help slow it down..
It'll leak a lot slower than Dextron!..
It'll leak a lot slower than Dextron!..
Haha, an exact reply I just posted in another thread:
RTV is all I use.
On top of that, I've had success stopping leaks like that without bothering to take everything apart. First, make sure you know where it's leaking from. Spray brake cleaner to remove the oil that has leaked and quickly wipe everything down with a paper towel. Then apply some RTV to the joint.
It's not as pretty looking but if it doesn't leak I don't care, just one more thing to think about.
Stop leak probably won't fix that leak.
RTV is all I use.
On top of that, I've had success stopping leaks like that without bothering to take everything apart. First, make sure you know where it's leaking from. Spray brake cleaner to remove the oil that has leaked and quickly wipe everything down with a paper towel. Then apply some RTV to the joint.
It's not as pretty looking but if it doesn't leak I don't care, just one more thing to think about.
Stop leak probably won't fix that leak.
I may try the RTV method first.
But if I have to split the case halves, can it be done in the truck? Or is it gonna be a beehotch to line everything back up and get it bolted back together? (ie. the shafts, bearings, etc...)
But if I have to split the case halves, can it be done in the truck? Or is it gonna be a beehotch to line everything back up and get it bolted back together? (ie. the shafts, bearings, etc...)
DeviousK5
1/2 ton status
definetly do-able, but for the extra 8 bolts and a nut , why not just pull it out? If you have to do it in the vehicle make sure you have some good assembly goo or vaseline on hand to hold the thrust washer to the case for the front out put. Also unless you let that bastard drain overnight (after splitting the case)im betting you will be fighting fluid on your fresh silicone as you put it all together, and you may not fix the leak- but rather relocate it. Also ill preach til the cows come home on putting a fresh seal for the input shaft. Im sure im not the only one who has seen and first hand experienced what happens when that seal lets your trans drain into the t-case , maybe climbing a grade and baking the trans due to lack of fluid.
Well, this trucks original 208 was toast when I got the truck, one of the reasons it was so cheap. I swapped the old t-case out with one supposedly rebuilt along with a 700R4 out of a parts burb I had out back before I even owned the K5. So, I've already pulled this t-case once and it's not a horrible job at all. This 208 was completely dry and clean outside and in the front adapter area, all I did was install a new rear output (slip yoke) seal in the new one before it went in. Even when the old one came out it was dry between the trans and old t-case. I think if I end up having to reseal the case halves I'll just pull the whole t-case and do it on the bench, that way I know it's done and sealed up good.
Tackled this on Saturday, wasn't bad overall. Pulled the t-case out, separated the case halves and tailshaft housing. Cleaned all the mating surfaces and resealed with black RTV. Quick inspection, the internals looked good, chain was tight and the plastic pads on the shift fork looked good. Put it back together and back in the truck. I think, if I had to do it again, I would try to reseal it in the truck.
zombie1969
1/2 ton status
Replaced some parts while mine was still in the truck so just a case seal is easy.
Yeah, I'll give that a shot next time. I was thinking it would be difficult to get the case back together. I thought I would have trouble aligning the shafts or something but everything stayed pretty solid when I took it apart. Thanx for the info!
