Overfilling tranny fluid - Team Camaro Tech
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post #1 of 7 (permalink) Old Nov 16th, 02, 10:48 PM Thread Starter
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what will happen if you overfill the tranny ? because i think i did. now i know you got to check the fluid while hot, but i just for the hell of it pulled the dipstick out while it was cold, the fluid level was all the way up on the stick to where it tells you to check while hot, i havent checked it while hot since . whats the dangers of overfilling?

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post #2 of 7 (permalink) Old Nov 17th, 02, 03:55 AM
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Drain it! Don't run it overfilled, I did that once on a TH350, and it exploded, put a hole in the side of it the size of a half dollar!! Save yourself the headache, don't be stupid like me........

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post #3 of 7 (permalink) Old Nov 17th, 02, 04:53 AM
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you are checking this with the motor running??? aren't you?? also on most dipsticks there is a hot line on one side and a cold measurement on the other, next time you change tranny fluid install a b/m drain plug kit that way you can let some fluid out if you over fill, goodluck
Jake
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post #4 of 7 (permalink) Old Nov 17th, 02, 06:58 AM
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Jake is right...you are checking with the motor running in park or neutral aren't you? Overfilling will cause oil to get tangled up in the rotating parts. It will foam and slip. In addition, oil will eventually start to blow out the vent on top. I have pumped out excess oil before using a drill-mounted pump, or hand pump. In a pinch, a turkey baster might work - although it would be slow. Other option is to crack the pan gasket a bit and drain a little out.

-dnult
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post #5 of 7 (permalink) Old Nov 17th, 02, 06:52 PM Thread Starter
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yes im checking it while it is running in neutral. i dont recall seeing a cold line on the stick, i just happened to pull it out oneday for the hell of it to see, it was cold and the level was at the full hot mark. so i was wondering if it was overfilled and what the consequences would be if it were, if it stops raining here ill check it hot.

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post #6 of 7 (permalink) Old Nov 18th, 02, 02:40 PM
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On GM Hydromatic transmissions, you can expect the level to increase as much as 1/2" when hot. Drain it back using one of the methods suggested. I don't recall hydromatics having a cold mark, but I've seen a few other models that have. All however, spec it by the hot mark. You don't have to have it in neutral - kinda makes me paranoid. Some chrystler / ford transmissions were that way. Park seems safer, but it is advisable to cycle the gears before checking. Usually a warmed up transmission from driving will be cycled enough. A warm-idle check should be preceded by cycling the shifter through the gears.

-dnult
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post #7 of 7 (permalink) Old Nov 18th, 02, 08:29 PM Thread Starter
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i checked it out while hot in the park position after i cycled the gears, it appears to be norma, just a hint above the normal level, so i guess my leak was in fact power stteering fluid as it was empty, i bought a bottle of lucas power steering stuff, so my steering is a little better and there is no noise.

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