Turbo 350 tranny question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Security guy · 09-06-2010, 01:59 PM

I got a question for the transmission guys. I got a 383 stroker backed by a 'built' 350 turbo tranny. I bought this 'as is' so I dont know what has been done to it. The problem I got is that it seems to shift fine, but its squirting tranny fluid out of the kickdown cable onto the intake manifold. It does it every time it shifts. I have only been able to take it up the road for a 1/4 mile or so. Im afriad of something catching on fire until I can find out what is causing it. I hope I don't have to pull the tranny. I can here bubbling like after I shut it off out of the kickdown cable. It does have a tranny cooler and the fluid level seems to be right where it should. Any thoughts? Thanks.

cdowns · 09-06-2010, 02:46 PM

have you checked the vent tube// passenger side above where the cooling lines go?

71meangreenc10 · 09-06-2010, 02:52 PM

Tube? TH400 has a tube, dont see one on a 350...

Smitty

**FRENCHBLUE72** · 09-06-2010, 03:45 PM

There's a tube on th350s if you burn one up like I did and overfill the thing on accident then fluid comes out the top of the tranny.. Should be a (mines metal)tube coming up out of the right hand side of the tranny almost on top check to make sure it is clear of mud or possibly dirt dobber material if the truck was sitting for a while.

71meangreenc10 · 09-06-2010, 04:07 PM

I have a 350 on the ground and one in my GMC and the only tubes on the passenger side is the fill tube and the vaccum line for the modulator...Would love to see a reference pic.

I will look into some more troubleshooting stuff i have to see what could be causing the over pressure situation.

Smitty

tonypaul · 09-06-2010, 04:23 PM

Right where the kickdown cable bolts into the trans- take out the 7/16 bolt pull out whole assembly (beware of trans fluid coming out) replace the o-ring on the plactic shaft... That should fix it!

71meangreenc10 · 09-06-2010, 04:36 PM

Found the vent....Its on the driver side, see if a insect has plugged it up. If not you have bigger problems if fluid is getting that far up on the manifold. You can push air through the dipstick tube to see if the vent is clogged, dont push too much through or you will catch it all back (fluid) when you remove the air. You should hear air coming out the vent if its ok.

Smitty

Security guy · 09-06-2010, 08:13 PM

Thanks for the tips guys. I'll have to get under this thing and check it out.

09-06-2010, 01:59 PM	#1
Security guy Registered User Join Date: Mar 2008 Location: Sarasota, Fl. Posts: 441	Turbo 350 tranny question I got a question for the transmission guys. I got a 383 stroker backed by a 'built' 350 turbo tranny. I bought this 'as is' so I dont know what has been done to it. The problem I got is that it seems to shift fine, but its squirting tranny fluid out of the kickdown cable onto the intake manifold. It does it every time it shifts. I have only been able to take it up the road for a 1/4 mile or so. Im afriad of something catching on fire until I can find out what is causing it. I hope I don't have to pull the tranny. I can here bubbling like after I shut it off out of the kickdown cable. It does have a tranny cooler and the fluid level seems to be right where it should. Any thoughts? Thanks.

09-06-2010, 02:46 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Turbo 350 tranny question have you checked the vent tube// passenger side above where the cooling lines go? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-06-2010, 02:52 PM	#3
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Turbo 350 tranny question Tube? TH400 has a tube, dont see one on a 350... Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

09-06-2010, 03:45 PM	#4
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,607	Re: Turbo 350 tranny question There's a tube on th350s if you burn one up like I did and overfill the thing on accident then fluid comes out the top of the tranny.. Should be a (mines metal)tube coming up out of the right hand side of the tranny almost on top check to make sure it is clear of mud or possibly dirt dobber material if the truck was sitting for a while. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

09-06-2010, 04:07 PM	#5
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Turbo 350 tranny question I have a 350 on the ground and one in my GMC and the only tubes on the passenger side is the fill tube and the vaccum line for the modulator...Would love to see a reference pic. I will look into some more troubleshooting stuff i have to see what could be causing the over pressure situation. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

09-06-2010, 04:23 PM	#6
tonypaul Registered User Join Date: Nov 2009 Location: Austin Tx Posts: 639	Re: Turbo 350 tranny question Right where the kickdown cable bolts into the trans- take out the 7/16 bolt pull out whole assembly (beware of trans fluid coming out) replace the o-ring on the plactic shaft... That should fix it!

09-06-2010, 04:36 PM	#7
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Turbo 350 tranny question Found the vent....Its on the driver side, see if a insect has plugged it up. If not you have bigger problems if fluid is getting that far up on the manifold. You can push air through the dipstick tube to see if the vent is clogged, dont push too much through or you will catch it all back (fluid) when you remove the air. You should hear air coming out the vent if its ok. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

09-06-2010, 08:13 PM	#8
Security guy Registered User Join Date: Mar 2008 Location: Sarasota, Fl. Posts: 441	Re: Turbo 350 tranny question Thanks for the tips guys. I'll have to get under this thing and check it out.



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