Can too much transmission fluid hurt the shifting of the transmission???

[Compaq888]

I checked the dip stick and it's way off from where it's suppose to be. When I got a tranny cooler I added half a quart, so can too much tranny fluid affect the shifting?

[SVOboy]

I doubt it, it just sits around and lubes, not like it's exerting pressure or it'd shoot out the fill hole.

[Compaq888]

I checked the dipstick and it's 1 inch higher than H, which is a little more than should be in there. I'm afraid to take out some fluid because I have a tranny cooler and it won't cool the fluid.

[diamondlarry]

I've always heard that aoutmatic ransmissions were kind of fussy about fluid levels. If you had some way of drawing a little out through the filler pipe it may help you. I had to do this on my Durango one time. It had a factory installed tranny cooler and it was showing overfull on the dipstick.

[Compaq888]

Thanks for the advice Larry, anyone else have same opinion as Larry?

[MetroMPG]

a quick google search turns up no shortage of pages warning against overfilling. to be safe, i'd remove any excess fluid.

[Compaq888]

Thanks, I'm going to remove the excess fluid. I think there is 0.5-1 quart too much.

[rh77]

If it's anything like engine oil, if you overfill it, it tends to become a foam becuase of the excessive movement against moving parts, and essentially renders the oil un-pumpable and won't get to vital parts. I'm thinking that trans fluid is similar, especially when pumping through a cooler. I know it's probably a pain to fill or drain, but I'd recommend getting the level within tolerances.

RH77

[diamondlarry]

I used a hand operated pump that I got from Autozone or someplace like that. It had a hose small enough that fit down inside the transmission dipstick tube. Much easier than taking the pan off and only takes a couple of minutes.

[Compaq888]

Originally Posted by rh77

If it's anything like engine oil, if you overfill it, it tends to become a foam becuase of the excessive movement against moving parts, and essentially renders the oil un-pumpable and won't get to vital parts. I'm thinking that trans fluid is similar, especially when pumping through a cooler. I know it's probably a pain to fill or drain, but I'd recommend getting the level within tolerances.

RH77

The problem is that I have a tranny cooler so extra fluid is required but I don't know how much is required. So I'm going going to drain it till it touches high. Right now it's way too far from high.

[Compaq888]

Originally Posted by diamondlarry

I used a hand operated pump that I got from Autozone or someplace like that. It had a hose small enough that fit down inside the transmission dipstick tube. Much easier than taking the pan off and only takes a couple of minutes.

I'm too broke now. I'm doing it the old fashined way, take out the dipstick and wipe it a couple of hundred times.

[JanGeo]

Yeah too full is bad - foams and adds drag - loosen a fitting to the oil cooler and let it leak out.

[SVOboy]

I'm too broke now. I'm doing it the old fashined way, take out the dipstick and wipe it a couple of hundred times.

Should sucked it out with a straw or something, that's what I did to my friend's once.

[Compaq888]

I took out about 8 ounces, size of a regular drinking cup. I can't take it down to oem levels because I have a aftermarket oil cooler. I drove for 40 miles the gauge didn't move much. We'll see how the next take will be. This one is ruined for sure since I did a lot of 4K idling.

[kirk37]

Well, here is what I learned from a well written book ?Complete Car Care Manual? published by Reader?s Digest (1981, page 202). ?You may accidentally overfill it and cause as much damage as you would by operating the car with too little fluid? with regard to overfill of automatic transmission fluid according to the book.

[KU40]

What are you? talking about and? why did you bring up this nearly 3? year old thread?

[dkjones96]

Haha, thread digger!

What better way to make your into than to reply to a couple year old thread.