TH350 overfill help? - Chevelle Tech
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  #1  
Old Sep 15th, 09, 1:19 PM
rich1978 rich1978 is offline
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Default TH350 overfill help?

Hi guys, I finally got my 72 Chevelle running, with a brand new TCI Super Streetfighter TH-350 transmission. Since the trannny is new, and it's got new fluid in it, it was so clean that I couldn't tell if it was full or not on the dipstick, so I overfilled it by about a quart (or maybe a more). As I was adding the fluid, I realized my mistake as I saw fluid running out on the ground on the passenger side (this was yesterday afternoon). Since then, it's continued to slowly leak/drip, coming from somewhere around the cooling line connections. I checked the fluid first thing this morning, and it was well over the "Full hot" line on the dipstick, and it had leaked a spot about the size of 2-3 dinner plates on the ground overnight. One other observation, it doesn't seem to drip when the engine is running, which I figure is because the fluid is circulating and the static level isn't as high.

Anyway, long story short, I'm just looking for a little reassurance that it's just the tranny being overfilled. I need to check that the cooling line connections are tight, but I'm pretty sure they are (can't turn by hand at least, and I checked them again when installing before I put the headers on, also doesn't seem like the tranny would drip with the engine off out of the cooling lines). Any thoughts? Thanks in advance!
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  #2  
Old Sep 15th, 09, 1:47 PM
Dave427 Dave427 is offline
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Default Re: TH350 overfill help?

Pull a cooler line off at the rad and get some to assist you while they run it and you remove a quart of oil out of it. You will need to clean that area off where the leak is, it might either be your dipstick or your kickdown cable leaking there. It may not be because it is overfilled.

Dave
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  #3  
Old Sep 15th, 09, 3:54 PM
Berto Berto is offline
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Default Re: TH350 overfill help?

could be a bad o ring on the dipstick. however, this is a great little tool every person should have. I bought it for the jet ski originally, but use it on the lawnmower, to get dirty brake fluid out of the cars, have done oil changes, you name it, anything except the fish aquarium
http://www.toolfetch.com/Category/Sh...ng/MIT7400.htm
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Old Sep 15th, 09, 4:01 PM
richietables richietables is offline
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Default Re: TH350 overfill help?

That's a handy device----

In the meantime, the cooler line method will do fine. It's hard to see clean tranny fluid, I agree...... Hopefully it's just over full.
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  #5  
Old Sep 15th, 09, 4:24 PM
Berto Berto is offline
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Default Re: TH350 overfill help?

yea that evacuator is great. its makes oil changes a breeze on the car. i will get what i can out of the pan through the dipstick tube and then pull the pan bolt and get the last 1/2 quart or so.
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  #6  
Old Sep 15th, 09, 4:53 PM
Motorvation Motorvation is offline
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Default Re: TH350 overfill help?

Careful when you fire the car with the cooler line off. Plenty of pressure and it shoots all over the place. You could pull the vacuum modulator and drain also.....

Steve O.
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  #7  
Old Sep 15th, 09, 5:12 PM
Autoengineer Autoengineer is offline
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Default Re: TH350 overfill help?

Is an overfilled TH350 tranny expected to leak? I might have the same problem.
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  #8  
Old Sep 15th, 09, 6:03 PM
DOUG G DOUG G is offline
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Default Re: TH350 overfill help?

Did you follow the tranny fill instructions ?
Run in in gear on stands (all forward and reverse) and check/add as going ?

You said you checked it in the morning and it was way high on the fluid level....The tranny needs to be at temp with motor running and on level ground to check level is why I ask the above.

A new th350 tranny/converter combo will hold approx. 10-12 qt.s depending on converter size (8,9,10,12") cooler size, and/or pan depth.
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  #9  
Old Sep 15th, 09, 6:21 PM
oldtimr oldtimr is offline
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Default Re: TH350 overfill help?

10 bucks, available at most auto stores. And get some rubber fuel line that fits the nipple on it. This is how I sweeten the ATF in older trannies, suck out a couple quarts and top it with fresh.
http://www.jegs.com/i/JEGS/555/80022/10002/-1

yeah you have a bad o-ring on your tube. also some of the aftermarket chrome dipsticks are just not going to retain the o-ring.

you could also just pull the 3/8 bolt that holds the tube to your engine and yank the whole tube out, let it lose what it loses, put a new o-ring and be about right. Or you could jack up 1 side of the car while the tube is out.
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  #10  
Old Sep 15th, 09, 6:26 PM
pnugene pnugene is offline
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Default Re: TH350 overfill help?

Even when over-filled, it shouldn't leak, but it will foam up the fluid and cause slipping. Check the dipstick and speedo gear o-rings as well as the cooler lines, vacuum modulator, and accumulator servo. I once had a pinhole leak at the dipstick tube where the welded tab bolted to the bell housing. A plugged or pinched vent line will cause the tranny to push fluid out the top of the dipstick too. Ask me how I know.
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  #11  
Old Sep 15th, 09, 6:33 PM
oldtimr oldtimr is offline
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Default Re: TH350 overfill help?

you can also home-build a vacuum device with a 1 gallon pickle jar. Just solder or jb weld some tubing into the lid. Leave 1 nipple up close to the lid and run the other down to the bottom. Connect the long nipple to a hose and stuff it down the tranny or whatever. Now the fun part. Go get a car that has fairly decent manifold vacuum and connect the short nipple to full manifold vac with a long-ass piece of hose and start the engine. STOP the process when you figger you should

I had one of these for about 10 years, finally broke it. Had some pretty good fun with it.
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  #12  
Old Sep 15th, 09, 6:59 PM
rich1978 rich1978 is offline
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Default Re: TH350 overfill help?

Wow, thanks for all the replies guys. It seems to have stopped leaking, I'll clean it up tomorrow, and then park it on some dry pavement to check it again.
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  #13  
Old Sep 15th, 09, 7:07 PM
zeke67 zeke67 is offline
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Default Re: TH350 overfill help?

An overfilled trany can also spit out the vent. It makes a mess, because the vent is on top.

I would be concerned if it is leaking out the trans cooler lines. This would not be symptomatic of overfill as these are pressure lines and would leak if they weren't tight. Whether over full or not.
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