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.
Still weeps th350
- Thread starter TJ1978
- Start date
The odd thing is that my truck doesnt sit level. Has a slight rake with the front higher. So if my front seal is leaking wouldnt the truck need to be level for the fluid to run out of that seal? Im not familiar with how th fluid fills the tranny. But gravity would be in play as always. But its weird how the fluid is above that spot on the tranny and the leak is going againts the trucks incline to drip down the front lip of the pan. Then as you can see once it hits the pan it makes it way to rear of truck before falling.
Could the tranny be cracked? I think somthing went screwy went lifting it and the Tcase to put in the new mounts.
Where are the leak points in the pic?
Im a bit confooosed.
Could the tranny be cracked? I think somthing went screwy went lifting it and the Tcase to put in the new mounts.
Where are the leak points in the pic?
Im a bit confooosed.
Last edited:
It’s getting to the point of not being fun. Ive spent more time under this truck than driving it since I bought it in May 2019. 7 months of working on it and Ive driven maybe a gas tank and a half on it...
I thought once I got the Tcase fixed and changed the tranny mounts Id be good to go. After spending months and $$$ on other things for it.
Now after finally getting the tranny pan to stop leaking. Tcase shifter fixed. Its now leaking worse from a spot it never did before. And a i havent even driven it.... just fired it up to check atf levels... how can a leak develope when you havent even put any miles on it?
Now I probably have to pull the tranny, which means Tcase and drive shafts.... ive about had it. Plus the new rebuolt engine weeps from multiple spots..
I want to take this truck to the desert and......
I thought once I got the Tcase fixed and changed the tranny mounts Id be good to go. After spending months and $$$ on other things for it.
Now after finally getting the tranny pan to stop leaking. Tcase shifter fixed. Its now leaking worse from a spot it never did before. And a i havent even driven it.... just fired it up to check atf levels... how can a leak develope when you havent even put any miles on it?
Now I probably have to pull the tranny, which means Tcase and drive shafts.... ive about had it. Plus the new rebuolt engine weeps from multiple spots..
I want to take this truck to the desert and......
... flogg it?
Believe me, we get it.
There are people here who haven't driven their k5 in more than 10 years and they are working on it all the time.
As for your problem, I can say 4 options:
Either case cracked (unlikely)
Or the seal on the input shaft was old and cracked and now is leaking.
Or the torque converter is leaking at the weld at the input sleeve (happened to me)
Or the gasket on the pump is leaking, that is the big flange with multiple bolts you see in that picture.
I had to pull my transmission 5 times in less than 2 months, first cracked flexplate, then slipping transmission, then another slipping transmission, then put a rebuilt transmission and had this leak, assumed it is the seal on the input shaft put it together and it still leaked, pulled it off and someone suggested to check the weld, and sure enough it was seeping.
I brazed it which completely sealed it without damaging anything and didn't have any trouble with it until I sold it a few years later
Last edited:
Or put about a thousand rounds through it.
Drove mine to California, had it die 75% of the way there. No time to deal with it, had to get it towed, pay storage on it for a month, get a rental for that time, then pay my dad to drive down with a trailer and meet me to pick it up. Fixed the problem (so I thought) only to have it die again, after working for months, in the exact same way, yet again requiring a tow. Now I wont be able to work on it for 6+ months, so when its prime time to drive it in the summer, I will be working on it.
T-case came out at least three times for leaks, it's now showing evidence of a failed input shaft seal, and leaking out of the setup I made to keep it from venting fluid as they are want to do.
When truck was running fine in November heater core started leaking out in the woods on a week+ trip.
These old trucks simply take work to keep on the road. If you disassembled one completely, down to bare axle tubes and empty transmission case, then rebuilt with quality parts, IF everything went together correctly, you'd probably get 5 to 10 years of reliable service. Most of us don't do a full restore on these things, thus, problem after problem after problem.
Sometimes you get a good year or so between issues, often it seems its every time you turn the key.
This is why I daily drive something with a warranty. I dont get so upset when the truck doesnt work, and I dont have a lot of time to work on it.
Brother... f-ing tell me about it. Everytime that thing fires up something else goes wrong. I just want to drive it. It just sits in my garage with an open mouth feeding on my money.
This is my motivation to just pull the tranny and get a new one, with warranty. It may be $1600 but at least I can drive it. And then just rebuild the one I have now down the road and have a spare. I do have the “K” case but to me, it doesnt mean shizzz if I cant even drive it.
Now my rear output to the rear drive line is leaking from the Tcase. I got a quote from a member here on a tranny and I may just buy it....
Yes 1000 rounds is an understatement...
Why is there a bolt missing on the front pump? Is the leak in output shaft coming out at the back of the slip yoke?
... flogg it?
Believe me, we get it.
There are people here who haven't driven their k5 in more than 10 years and they are working on it all the time.
As for your problem, I can say 4 options:
Either case cracked (unlikely)
Or the seal on the input shaft was old and cracked and now is leaking.
Or the torque converter is leaking at the weld at the input sleeve (happened to me)
Or the gasket on the pump is leaking, that is the big flange with multiple bolts you see in that picture.
I had to pull my transmission 5 times in less than 2 months, first cracked flexplate, then slipping transmission, then another slipping transmission, then put a rebuilt transmission and had this leak, assumed it is the seal on the input shaft put it together and it still leaked, pulled it off and someone suggested to check the weld, and sure enough it was seeping.
I brazed it which completely sealed it without damaging anything and didn't have any trouble with it until I sold it a few years later
It’s probably all of them. If Im pulling this tranny Im putting in a new one. I can just keep this one and rebuild later and have an extra. Im sure I can install a transmission.
From a “replace front pump” video not my transmission
Where is the leak in rear output? The slip yoke gets worn and oil can leak out the back of slip yoke.It is a common problem, remedy with some silicone on outside of the back of the yoke.
Rear seal changing time.
it will work
the front pump gasket and o ring are probably the cause this leak. the torque converter seems dry in your pictures.
K case is a little beefier in the bell housing area. My parent's second hand 78 k20 burb smb 400 th350 and np203, the bell housing crack and tore. it had been replaced with a car trans, and the braces at the flex plate cover were missing.
K case is a little beefier in the bell housing area. My parent's second hand 78 k20 burb smb 400 th350 and np203, the bell housing crack and tore. it had been replaced with a car trans, and the braces at the flex plate cover were missing.
Thats my thought. It’s the only spot(s) up front where it could be coming from. And lifting the Tcase/tranny to install the mounts must have rustled something to cause this. Nothing else has changed, driven or done to cause the leak.
Im going to get the harbor freight tranny jack and just pull it all down. Clean, seal then put it back. It has to be done either now or later. Id rather just do it now.
Tranny can get rebuilt or replaced and I can fix the out pit shafy seal on the Tcase and clean that up.
I would believe that it set for a long time without oil and dried out. When you refilled with oil and started running it thru the gears it started to leak.
Its coming from one of the bottom pump seal screws....
It appears
Sprayed some break clean in there. Ill check back in a bit see if I can see the exact leak point
It appears
Sprayed some break clean in there. Ill check back in a bit see if I can see the exact leak point
Last edited:
After break clean
Yeah that's a bead of silicone. Either someone has tried to bandaid that leak or they didn't know what they were doing.
I am suspicious that there could be silicone spread around the inside possibly blocking or restricting hydraulic circuits.
Have you seen bits of silicone in the pan at all.
I think you should go head with your plan to have this trans overhauled by a reputable builder.
I am suspicious that there could be silicone spread around the inside possibly blocking or restricting hydraulic circuits.
Have you seen bits of silicone in the pan at all.
I think you should go head with your plan to have this trans overhauled by a reputable builder.
