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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Sprinkler-Man on November 05, 2015, 09:12:09 pm
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I was driving my truck and the np 205 transfer case blew out one of the inspection plugs and lost the fluid. I didn't hear any grinding but the truck went into neutral and now it won't go. I cleaned the vent and reinstalled the plug and filled it with fluid but it is still in neutral. Any ideas?
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did it just stop or what?
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I was driving it and the RPM of the engine started to go up like something was slipping so I pulled over. When I gave it gas the truck stood still and the engine just rev'd. When the tow arrived I noticed there was fluid in the ground. I thought at first I had blown a tranny line but when I checked the next day one of the rubber inspection plugs was missing from the transfer case and the tranny was full of fluid.
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what trans
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if you can drop the transfer case, you can verify it is the transfer by rotating the input shaft, and watching the outputs, you can rotate the input and try and hold the outputs too to make sure they are still solid, all while shifting it through the ranges, if none of the outputs rotate with the input, something sheared, normally a key, sometimes the whole shaft.
if the outputs do rotate with the input, I would look at the tranny itself,(I assume some automatic one, since you said tranny lines earlier)
actually I would look and make sure all the linkages are adjusted right first, if the shifter linkage for the tranny or transfer isn't getting into the right location, it may not get in gear right
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Transmission is a TH 350. I figured if the transfer case was stuck in neutral the truck should move in park but it wouldn't. I started it up and it would move a little with everything cold but once it heated up nothing. May it is the transmission?
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is the tans fluid brown?
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No, nice and pink. I was told that if I jack up the rear end, put the transmission in neutral, the transfer case in 4wd and not lock the hubs I could see if the transfer case was working by spinning the front drive shaft and see if the rear wheels spin. I will give that a try and let everyone know what happens.
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since you have a 205 and its all gear driven it either works or not. and since you said when its cold you can get some movement im betting on the trans. if you put it in 1st manually does it move?
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Only at first when it is cold. Give it a minute to heat up and nothing.
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Did you add enough fluid to fill the transfer case and the transmission?
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The T case and trans don't share fluid. You will put fluid from the trans to the adapter but there's a weep hole that will allow it to drain back to the transmission
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Only at first when it is cold. Give it a minute to heat up and nothing.
Sounds like you need a trans rebuild. Idk much about them so I can't say for sure but someone on here will direct you. If it was me I would either rebuild it myself if I had the extra room or take it to a shop to rebuild it
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If you leave tranny in park, but move transfer to 4wd can you move front drive shaft by hand?, if you can then definitely transfer, or actually can you roll truck while in park? If it does not roll then definitely transmission, just odd to lose transfer case fluid, but lose the tranny
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Oh never mind reread earlier post, something in tranny for sure, lost pressure for whatever reason(why it wants to go cold, higher pressure) could be as simple as torque converter gone bad
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It doesn't move with the transmission in park so I'm guessing it's the transmission too. I hope it's not the converter. Just put in a new 2500 stall.
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well got some bad news. even if its something in the trans the converter is still contaminated and should be replaced.
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well got some bad news. even if its something in the trans the converter is still contaminated and should be replaced.
Agreed, if you want any kind of warranty on new trans, you need new tc
That being said, I have seen new tc's go bad almost immediatly- something that could mean warranty replacement
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well got some bad news. even if its something in the trans the converter is still contaminated and should be replaced.
Agreed, if you want any kind of warranty on new trans, you need new tc
That being said, I have seen new tc's go bad almost immediatly- something that could mean warranty replacement
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i was thinking the same thing. if you still have a warranty on that tc you might be able to get a replacement
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How can you tell if it is the TC? I have my old one still so I could put that one back in but that is a lot of work just for a test.
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im not sure if you can pin point if its the tc or trans. i dont see the harm in putting your old one back in since it should be scrapped anyway due to it being contaminated. i dont know if you will see any difference in if the trans works or not
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I guess we should ask why the TC was changed in the first place. if you just wanted a higher stall, and the original was fine, then popping it back in may show the new TC is at fault if the truck moves-which means check warranty on TC
a transmission rebuild should really be considered even if it ends up being the TC, so many fine particles going through the tranny is not good
the odds of an auto just failing with no warning of slipping or anything tend to be pretty slim, although now that I say that; it isn't really all that uncommon either, it is just less likely
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ive heard of tcs going bad shortly after install. and most of refurbished but the problem is with that afaik its only a visual inspection of the internal parts and if it looks bad they will replace it
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Well it is not the transfer case. I am going to drain the fluid from the transmission and see if there is any metal in it and start from there. I put in a new 2500 stall because I rebuilt a 350 and the power curve is in a higher RPM range then stock. I will have the trans rebuilt over winter and start again in spring....I only have about 10 miles on the new engine and wanted to get some miles on it before the snow flies...bummer
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so you put about 10 miles on this 2500 stall TC?
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Yes, that's it.
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yeah sounds like the stall is the problem.