NP 205 Transfer Case

[Backcountry]

:huh Hello all!

I just purchased a 1973 Chevy K10 4x4 longbed pickup and had a question and concern.

After I purchased the truck, I took it to a Jiffy Lube place to have the oil changed in both front and rear differentials, the transmission and tranfer case.

I then drove the truck at freeway speeds for about 130 miles to my destination spent the night then drove home. Once I got home I checked the truck out to make sure everything was ok. I looked under the vehicle and noticed that oil had coated the underside from the transfer case back and that the transfer case was very hot. Upon further examination, It appeared to have come from the tranfer case. I let the vehicle set for a few days then placed it on level ground and checked the fluid level. It appears that the service center overfilled my tranfer case.

I removed the fill plug and about two quarts came rushing out. I then replaced the plug when the oil stopped flowing and went for a little drive. Everything seems to work ok however, I am concerned that some damage may have occured. What do you guys think??? This tranfer case was just rebuilt about 4 months ago. Also, is the proper oil level supose to be at or slightly below the fill plug??

Any and all help would be much appreciated.

Guy

[wyldman]

It should be just level with the fill plug hole.

2 quarts overfull seems hard to believe,as it would be very difficult to get that much in without it spilling back out before you get the plug back in.

It shouldn't really have done any damage,they have a vent to allow any excess to puke out.

[sonjaab]

BACK..........WOW........i had just the opposite problem with
"the pros" at Jiffy Lube (as they advertise themselves).

I took my new 90 GMC in for LOF....Seems they had a special
on changing your rear diff. fluid for $19.95. Told the guy "this
truck is brand new and don't need it"!

They use a vaccuum pump to get your old diff. fluid out.
Seems the dum-dum in the pit didn't get the message !

I made it from Syracuse to the PA Northeast ext. on my way
to Philly and the rear end grenaded !
Towed to GM dealer.........They say....NO FLUID.....ABUSE
NO WARRANTY......too bad so sad !!!!!!

Borrowed a flatbed and brought it home. My bud at the local
garage fixed it for me. But still cost $$$$.

Tried to get Jiffy Jam to pay to repair it...YEA RIGHT.........Jumped thru all the hoops with their insurance company etc.
They never paid a penny.................
Needless to say they are out of business in the Syracuse area
now.............LOL !!!!!!!

NOW..I go outta my way to take my vehicles to the selling GM
dealer for a LOF. Cost more but if they mess it up they PAY!
.........geo

[ratlover]

It would take some serious work to overfill a TC. There are 2 plugs.....one on top one on bottom, not to insult you but you were checking the one 1/2 or so up the case right?

[wyldman]

Originally posted by ratlover
It would take some serious work to overfill a TC. There are 2 plugs.....one on top one on bottom, not to insult you but you were checking the one 1/2 or so up the case right?

I was just thinking the same thing !

[Backcountry]

Yes guys! LOL!

I checked the upper fill plug near the output shaft.

Ya, the guys at Jiffy Lube are knuckle heads. I pulled the fill plug and captured just shy of two quarts in a container. I took it for a drive and it seems to work great with no heat buildup. Hopefully no long term effects though.

Thank you!

Guy

[ratlover]

I'm wondering how the heck they did that??? Unless they stuck the truck on its nose and filled her up :eek:

I wouldnt think that the excessive heat would cause the fluid to expand to 2 quarts :confused:

Not coming from the trany is it? Hows its level?

[ratlover]

oh.....and for grins anytime I fear I got the fluid/grease what ever in anything too hot or somehow got it contaminated with water I change the stuff out.

Too much fluid could cause things to run hotter but I am still baffled how the heck they got 2 quarts extra in there......I mean I would be hard pressed to do it if I tried. You should ask em since I would be currious.....I mean without getting elaborate or going through some crazy motions I dont see for the life of me how it could be done......unless they just kept hosing the stuff in there and shoved the plug in quick.....theres a hell of a mental pick. Some goober under the truck with the little fill hose pumping like mad with the stuff gushing out and quickly jaming the plug in cussing the designers for not putting the fill plug on the top and hoping you truck will make it down the road since he is sure he didnt get it all filled up. :rolleyes:

[76chevyman]

Just from my experiance. I use to work the pits at a express way and the pumps we used to fill the trnnys and t.c. the nozzle would fit in the hole and block the hole off for the most part, and alot of the guns were riged so they can keep running so you can go on to the grease fitting or what ever else you had to do to the truck. So its not as hard as you think to over fill a Manual tranny or t.c. But when that happens u normaly take the gun out and just let it drain level with the hole. But some arent that smart.

Rich:burnout

[Backcountry]

Yes, I agree with 76chevyman. If the fill hose is the same size as the fill hole, it is easy to do. However, when the service guy pulled the hose he should have left the plug out for a sec instead of replace it as soon as he pulled his fill hose. This is what I believe happened. Now I need to check the trans, and both differentials as well.

I tell you guys! It blew me away when I removed the fill plug and oil came gushing out and wouldnt stop. I thought at first I had gone crazy and forgot the proper proceedure to check fluid levels. :)

I was concerned because excessive fluid causes foaming witch in turn causes excessive heat buildup. I thought that all the air pockets caused by the foaming may have left metal to metal contact. This trasfer case was rebuilt 4 months ago. Damage may have occured however, it may not show up for a while.

btw! My first indicator that this service guy was nuts was when he was going to fill the transfer case with auto trans fluid lol! i had to explain to him that the aluminum cases use atf not the cast iron ones. :)

Anyway all, Thank you so much for all the help!

Guy
:D :cool:

[76chevyman]

It will take A whole lot i mean a whole lot more to damage that NP205 I have one in my 76 chevy with the granny 4-speed a great plow truck and mud bogger LOL.

Rich:burnout

[Backcountry]

ratlover may be onto something. Is it possible for the transmisson oil to drain into the transfer case???

**** man! I hope not because I have been driving this beast around without trans fluid.

Guy

[Big Nate's Plowing]

in the 205's it really dosent matter if it is atf or 90 weight, 99% of new manual trannys-tcases come with atf

I ran amsoil atf in my 205 last season

[Big Nate's Plowing]

Originally posted by Backcountry
ratlover may be onto something. Is it possible for the transmisson oil to drain into the transfer case???

**** man! I hope not because I have been driving this beast around without trans fluid.

Guy

only wy would be if the output shaft seal went on the trans AND if the input seal on the t-case went south too, if it has a intermediate shaft (devorced case) then it is NOT possable at all

[76chevyman]

I kind of agree with Big Nate's Plowing because on those older chevys (ihave a 76 chevy) there is like a foot gap between tranny and transfer. With the tranny mount and theres a shaft that connects the two. But from your simtoms it sure does make me wounder. Now if it was a late 80s thru 90s chevy i would say yes 100% due to the transfer is bolted right to the back of the tranny. But is the early years they had that big tranny mount that was between the two and a shaft on the inside. But i can be wrong and i hope i lern something out of this

Rich


:burnout

[Backcountry]

Ya, there is about a 12" spacer/housing between the tran and transfer case. I am told that there is a seal at both ends.

Both are at proper levels now. I will continue to monitor them very closely now.

I'm thinking the Jiffy Lube guys may have forgot to refill the trans after they drained it. :(

I took the truck on a 100 mile cruise. I will check the oil levels tomarrow to see if the levels have changed.

Guy

[76chevyman]

But it seems werid to me that you drained the transfer case to the level it should be and then you go back 100 miles later and its over filled again and the tranny is low. I tell you one thing i would be looking at it for awhile scrathing my head LOL'

Rich:burnout

[79chevybigred]

Hey i work at a lube shop. The pumps we use can shoot that stuff a god 15ft and if Jiffy Lube has close to the same its very easy to overfill. We fired a guy couple months ago for overfilling a T-case, when i came back chewed up. cost the shp a pretty penny but at least we arent paying him anymore. There are alot of Dips out there working in the Pits, so just check everything before ya get to far. Unfortunatly his story isnt uncommon, most people just never bother to check.

[Backcountry]

Guess what all? The transmission kept emptying and the transfer case filling.

I have no idea what caused the seals to go bad; problem is I may never know.

I took my truck back to the place that susposedly rebuilt the transmission and transfer case and they replaced the seals "free of charge". Somehow the seals between the transmission and transfer case went bad. The guy told me that it is very common. I had to laugh because they had just been replaced them. They only had about 800 miles on them. I told the guy; you mean to tell me that I have to have them replaced every 800 miles? LOL what a joke!

Anyway, thats for all the help!

Guy :headwall

[Staley52]

I have had 3 trans/tcase combinations just like that all 3 leaked trans fluid in to the tcase I just draned the extra from one and pumped into the other every 2 weeks a good time to do an inspection for problems from use/abuse

[76chevyman]

MY tranny and TC(np205) was rebuilt 3 years ago and havent had a seal go yet one of the covers on the tranny is starting to leak but that nothing to fix. But i am going to replace the clucth this summer so we will see how the rebuild held up.

Rich:burnout