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9/13/11 11:35am - Original Message: 'FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
 I am interested in changing the fluid in the punkin of my '75. How do you clean it to get all the goop out and start fresh without pullin it out?  The clutches are slightly noisey and I want to avoid a total melt down.  THANKS.  The noise is mostly backing up. I checked ALL the U-joints. They are in good shape.
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9/13/11 11:58am - Reply: 'Re: FLUSH IT!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
ConfusedWhat are you doing running around wid a punkin in yer car, anyway?

LOL

The only way to get it fairly clean without pulling it is to drill a hole in the bottom of the case, then tap the hole for a pipe plug. Then you can drain the fluid, and spray some carb/brake cleaner up around inside there from the filler hole.
Put in the plug, and refill, starting with the posi additive, then finishing with gear lube....
Otherwise, you can get a suction gun type apparatus, and draw out most of the old fluid, and go that route....


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9/13/11 7:55pm - Reply: 'Re: FLUSH IT!'
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Sounds like a lot of work! And with my luck, after all that was done I'd STILL have to pull it!
 
Barry
 
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9/13/11 9:17pm - Reply: 'Re: FLUSH IT!'
my7t1 Lifetime Member
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Dorr, MI - USA

Vette(s):
71 Colonnade Hardtop Coupe Torch Red with black interior originally L48 built to push around 360hp

Joined: 8/21/2002
Posts: 2580
Sucked my punkin with a shop vac and homemade attachment. What a friggin mess. P wasn't real happy bout it. But it werked.


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9/13/11 9:44pm - Reply: 'Re: FLUSH IT!'
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I got a suction gun from a local auto parts store. Pretty cheap as I remember.
I pumped it out twice with some driving in between.
No noises or binding out of the rear since.
Go for it!
Kevin


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9/14/11 10:46am - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
Thumbs Up  THANKS to all who contributed. I am bound for the local speed shop for a pump. I see in CORVETTE CENTRAL's book they have a kit to drill and tap punkin. At this point I am not ready for a $77.00 bill plus shipping. I have a feeling the stuff that is in there is NOT the correct juice. Gonna let the General provide the next fill up with additive.

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9/14/11 11:25am - Reply: 'Re: FLUSH IT!'
ebo Lifetime Member
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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4395
I did it years ago with a suction gun, I do not think it was to bad of a job.Confused
 
But you could always borrow Terry's shop vac. Tell Patty that he said it was ok...like what she guna do twist off his fingers or sumptin.....  Just Sayin...... (TUX quote)
Evil Smileebo 


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9/14/11 11:50am - Reply: 'Re: FLUSH IT!'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Hey Mark, I can get a tap and a pipe plug for less than $10. That's all you need.
Dave


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Dave's '82


   
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9/14/11 2:45pm - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
Clap Bring it up! I have a drill and cord. I can possibly find the stuff I need in my box of goodies if I look hard enough.

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9/14/11 2:56pm - Reply: 'Re: FLUSH IT!'
The Rook Lifetime Member
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Pittsburgh, PA - USA

Vette(s):
1979 L-82, 3 spd auto, car was originally Lt. Beige currently painted Sportsman Red, Doeskin leather interior, 103,000 miles......

Joined: 12/4/2002
Posts: 600
Good news, once you get it drained I found the stuff that goes back in..........

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9/14/11 2:58pm - Reply: 'Re: FLUSH IT!'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
See if you have a "Q" (.332 dia.) drill bit. I have a tap for a 1/8" NPT, so it won't cost you anything. I'm sure I can come up with a plug also.
Dave


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Dave's '82


   
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9/14/11 3:04pm - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
ClapClapThumbs UpCool  I LOVE IT!  Now if it will only stop the clutches from chattering we'll be in good shape.  How bout heatin it up and addin cream -n- sugar? Could make a nice fall foliage beverage to go with the cool brisk nite at the track.  We could even whip it up with the tap that DaveM is supplying.

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9/15/11 5:21am - Reply: 'Re: FLUSH IT!'
dwright Gold Member
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Victor, NY - USA

Vette(s):
2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe

Joined: 7/12/2004
Posts: 6757
I don't want to be pessimistic, but you might have a cracked or broken posi clutch spring.
If you clean it out and put it all back with the good oil and posi additive and it still clunks, especially turning or backing up, you might want to look at replacing the springs.


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9/16/11 7:22am - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
O.K. I found all the needed "TOOLS" to do the Drill,Tap,Drain deal, Now where do I drill the hole? WHOOPS, I know, close to the bottom, but how do I miss the internals and not leave part of the bit in there? THANKS  Mark
 
    Also, Is ALL positraction fluid the same?  I am only using G.M. plus the additive.


|UPDATED|9/16/2011 5:22:31 AM (AZT)|/UPDATED|


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9/16/11 12:26pm - Reply: 'Re: FLUSH IT!'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19459
If you buy gear lube from GM they will tell you it already has the posi additive in it....put the other separate bottle in anyway....don't fall for that "One size fits all" crap.

Yup..ya needs to drill the hole in the bottom of the diff....I saw somewhere someone had a pic, and a template for doing this. Don't know if it was Mid Am, or who....


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Joel Adams
C3VR Lifetime Member #56    
My Link


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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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9/28/11 7:17am - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
Clap The process worked VERY WELL. All is quiet and smooth. Teflon tape on the plug, and not a drop of a leak on the floor.  On to the next project.  THANKS to all who contributed.

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9/28/11 11:48am - Reply: 'Re: FLUSH IT!'
aceinthehole Lifetime Member
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Valley Springs, CA - USA

Vette(s):
1978,Metalic Money Green W/Gold emblems,TH350 w/gear splitter,black & grey interior.1978,two tone,Metalic Rootbeer & gold ,Doeskin interior,auto. trans. 1981, Silver w/mirrored T-Tops,4 spd, charcoal interior.

Joined: 11/20/2005
Posts: 3618
So Mark, was there a prefered drilling location ? If so, please share with us.

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Jimmy B.
Just can't wait to get on the road again.

 
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9/29/11 7:25am - Reply: 'Re: FLUSH IT!'
manchestershark Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1901
There is a flat boss on the bottom, just behind the yoke. I drilled about 3 inches rear of the seal. Do not go to deep as the pinion is close in there. Once the oil starts to seep I stopped. Be careful to clean out remaining depth. You can put a piece of copper tubing or rubber hose on the drill bit to limit your depth, and not contact the pinion. Once you get the tap started and a few threads made, you can continue with a flat tap on bottom, less the starting tapper. The tap will contact the pinion before all the threads are cut, thus the need for a flat bottom tap.  Hope this makes sense and you can figure it out.  Mark

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