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#1 |
The Original HotRod KnifeMaker
![]() Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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My turbo 400 transmission, after being hot and filled to the hot mark on the dipstick, is now blowing Tfluid out of the Dipstick tube. The o-ring had been changed twice with no change. It is not leaking anywhere else.
If I take out 2 quarts it stops the spewing and engages the way it should, but is off the bottom end of the dipstick. That's not gonna work for me. The tranny worked just fine until filled to the mark. I filled it with the amount of quarts it called for when we swapped it to replace the 350 and had it out for cleaning and painting- it worked very well until the mechanic on Tuesday filled it to the mark on the dipstick. Did Chevy build turbo 400 dipsticks in different lengths? Are the 400 short-shaft 400s using a different length? 4x4s maybe? Any knowledgeable help is disparately needed. Who do I call or where do I find info on dip stick lengths for the turbo 400s? TIA,
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#2 |
Registered User
Join Date: Sep 2006
Location: colorado springs colorado
Posts: 737
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
just out of curiousity,,,, do you actually have the 400 dipstick in it? did the 350 dipstick get switched with the 400?
I have 2 400s what did you need to know about the dipstick? measurements? let me know i'll get measurements for you pics to if you need them Frank
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70 chevy lwb c10 454/th400 and a 9" rearend suicide doors, marker light fuel fill, 4" cowl , mini tub |
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#3 |
The Original HotRod KnifeMaker
![]() Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
Sick69, was my first thought, too, that I had maybe switched them by mistake. So I went over to Classic Heartbeat and Wes pulled dipsticks from 3 different 400s and one 350- they are all the same length. The mechanic is gonna switch out the tube and dipstick for one of Wes's 400s and see it that makes a difference The tubes & sticks are at the mechanic's now and I haven't energy enough to run back up there again today.
Anyone else have any ideas or had this problem? Thanks,
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#4 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
If I remember right the 400's have a vent tube right in top. Make sure its clear.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#5 |
Registered User
Join Date: Nov 2005
Location: birmingham, al
Posts: 39
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
Had it happen to me and found out the filter was cracked and sucking air. Just a thought.
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#6 |
Active Member
![]() Join Date: May 2005
Location: San Jose, CA
Posts: 235
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
there is a vent tube, and they do get clogged with all sorts of things (paint, grease, crud whatnot) thats where I would check first
J
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Cadillac Powered |
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#7 |
Registered User
Join Date: Dec 2006
Location: POWNAL VERMONT
Posts: 343
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
try this iv'e seen tranny's work fine run low weird as it sound's but i had a vent tube cause this problem it was a bee making a nest
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1972 c-20 chevy 500 caddy/4.10posi / 1972 3/4 ton gmc 350 4x4/4.10posi front&rear ![]() ![]() ![]() |
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#8 |
Sheetmetal Psycho
Join Date: May 2005
Location: athens PA
Posts: 515
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
ditto on checking the vent tube - had a tranny blow a seal and it was blamed upon some bees making a home in the tube while it was parked for awhile.....
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I didn't say you were stupid, but I was thinking it... I need a check up from the neck up! Project "Rigginstine's Monster" 1971 C-10 longbed 355/4spd Future mods: 67 front clip Webby's Rigginations - where everything has potential! |
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#9 |
The Original HotRod KnifeMaker
![]() Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
While no one has answered the direct question about different length dipsticks it appears they are the same and this dang vent tube may be the culprit.
Anyone have a pic of the vent tube so I can locate it? As usual, thanks to all who took the time to answer. I love this board!
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Dave 69 GMC SWB 2WD 454 Turbo 400 Last edited by WinDancer; 08-09-2007 at 10:53 PM. Reason: bad spllr |
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#10 |
Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
i belive the 4wd trucks with ac had a longer tube and stick
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common sense isn't so common anymore |
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#11 |
Active Member
![]() Join Date: May 2005
Location: San Jose, CA
Posts: 235
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
hard to see, but follow the braided trans line inbound...looks like a 1/4 moon tube. (Pass side top)
2nd is a th400 dipstick (out of a cadillac 1976)
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Cadillac Powered Last edited by Jayss109; 08-09-2007 at 11:16 PM. |
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#12 |
Registered User
Join Date: Mar 2007
Location: Texas
Posts: 252
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
itll be right on top of the tranny, just a small vent line about 3 inches long or so
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-Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia" |
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#13 |
The Original HotRod KnifeMaker
![]() Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
Just talked with the mechanic again.
The 24" tube from Wes has been installed, but now the ATF doesn't show on the stick and is still blowing thru the dipstick tube. The vent tube is clear and that is blowing a little AFT also. The mechanic also said the only thing that made sense now was that the torque converter was somehow draining back into the tranny case and causing the over-full problem. Said he was gonna talk to a couple tranny shops and see what they suggested. Found several problems like this thru google but none had a fix. I have heard nothing but great things about the turbo 400 ever since I can remember. Guess this is one small item for the other side. Thanks for all the great suggestions and things to try. Will update this post after the problem is fixed [or the truck is stolen - just kidding] to have a record of the problem and the fix together.
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#14 |
The Original HotRod KnifeMaker
![]() Join Date: Jan 2007
Location: Tenino, Washington
Posts: 811
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
Well, just ordered a new street-fighter TCI 400 from Summit- the tranny was toast.
Hope others have better luck ![]()
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Dave 69 GMC SWB 2WD 454 Turbo 400 |
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#15 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,140
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
Just curious! What prompted you to fill it? Was it acting up? Was it low and you just never checked it? What part was toast, did you figure WHY it was blowing oil.
It’s nice to know so if we ever run across this problem we can remember back to your post. Not trying to be a smart ass - just wanting to know. Thanks
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#16 |
huh?
![]() Join Date: May 2000
Location: Washington, Illinois
Posts: 5,692
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
I agree, I'd like more info if you have any. A friend of mine had a TH400 that puked out of the dipstick tube after it was run and shut down, and he tracked it down to a balooned torque converter.
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Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay |
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#17 |
Registered User
Join Date: Mar 2007
Location: Ben Wheeler,Texas
Posts: 992
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Re: Turbo 400 leaking/blowing ATF out the top of the dipstick tube
The pump going south will do the same thing. Is this a fresh install? If so you may have needed to put some washers inbetween the torque converter and flexplated to keep the torque converter from walking back and fourth. It takes more pressure in reverse and can force the converter into the pump. Kind of hard to explain how it does this, but it has happened to me. I would pull a line off the TQ converter and see if you have fluid pumping thru. Normally when this happens you loose all gears at once...VERY quickly! Hope it is just the vent tube, and if so you can stick a paper clip or piece of wire in it to clear any debris blocking it. Good luck!
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05 2500HD 6.0 excab 69 LWB-Gone but not forgotten! 68 Dodge Charger 383/727 69 Dodge Charger-440/4spd |
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