how low on fluid (TH350) before it quits moving? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-24-2002, 05:00 PM
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Question how low on fluid (TH350) before it quits moving?

I have a 1977 TH350 trans that leaks through the front seal. Of course I need to replace it, but I can't raise the truck in the garage high enough to do it. So that means it has to be a summer project. As the trans leaks while it sits, I have to keep an eye on the fluid level. Today I took it out for a cruise knowing that the fluid was low and I planned to warm it up by going around the block before I checked it. I made it 1/2 way and as I started up a steep hill it felt like someone took it out of gear, I had no forward or reverse. I drifted and leveled the truck in a driveway and after a minuite I had movement again. When I checked the fluid, to my suprise, it needed almost a full quart (28 oz total). My thought is, the fluid was so low when I started up a hill it couldn't draw any fluid from the pan and just stopped. Once I leveled out it took a minuite to suck it back up and away I went. Does this sound reasonable or am I on the brink on iminent disaster? The fluid is as bright red as the day it came out of the bottle (so is the fluid on my garage floor!). When I started having problems with the front seal leaking, I put in some magical goo juice that was supposed to swell the seals. After I did that, my reverse doesn't go in quite as quickly, and the only thing that swelled was the wallet of the guy who sold it! Could it possibly have gummed my filter? I was told that "everything" was rebuilt when the truck was built, I only assumed that he meant the trans too. I don't know how fresh the trans is, but I believe that it only has 3200 miles on it. Your thoughts greatly appreciated! HotRod <img src="confused.gif" border="0">

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Old 03-24-2002, 05:40 PM
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i have a ford to yes 1 quart will do just that when you do youre summer job be sure to check the shaft coming out of the tranny to make sure it doesnt have to much play for i have seen to many seals changed and the shaft had to much play i have driven my fords for a long time with the same problem i just had to watch that fluid real close also by checking the shaft it will tell you if its been rebuilt good luck gordon
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Old 03-26-2002, 07:23 PM
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Don't ever use mechanic in a bottle my opion Ilearned the hard way in a dodge it ended up making the leak 20 times worse. back to your 350 you may need to check the seal around the pump to.Ive got two doing the same thing.good luck hopefully nothihg else is wrong
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Old 10-11-2002, 06:07 PM
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I spent over 10 years as an auto mechanic doing transmissions. I speent alot of that time rebuilding automatic transmissions that had some type of "magic" repair in a can put in them. People... if it was that easy to repair a transmission, there wouldn't be any need for transmission shops. Those products affect all of the seals in the transmissions, not just the ones that are leaking. A trans that is low on fluid, as little as 1 quart,and sometimes even less, will not operate properly. Keep the fluid level where it is supposed to be, using only the proper type of fluid. A turbo 350 was one of the greatest friends of the trans shops when they came out. They can be very dependable if they are taken care of, but are not able to take the abuse of low fluid.
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Old 10-11-2002, 06:34 PM
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Well put... as little as half a quart, and you will notice some slippage under hard acceleration.
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