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How much damage was likely done? #4786264 06/13/18 08:40 PM
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gfh77665 Offline OP
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I bought a used Chevy Silverado (5.3) almost a year ago, just after the great Harvey flood. It had 145K miles at that time. I checked the vehicle over pretty good when I bought it, and I remember seeing nice red Trans fluid on the dipstick then.

I have since driven about 15,000 miles, and I checked the fluid again this week and found the fluid level almost 2 inches above the crosshatch mark. I don't know how I missed the overfill earlier, but I suppose I did.

I took it to an independent shop and they did a BG flush, and the fluid is now new, and at the correct level. The truck has never exhibited any trans symptoms. Shifts have always been correct. The fluid was still red at the time of change.

My question is, all things considered, how much damage (if any) was done? Should I worry much? Thanks.

Re: How much damage was likely done? [Re: gfh77665] #4786265 06/13/18 08:42 PM
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Reddy45 Offline
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Was the trans at operating temp and the truck on a level surface when you checked it both times?

Re: How much damage was likely done? [Re: Reddy45] #4786267 06/13/18 08:43 PM
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gfh77665 Offline OP
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Yes. Its pancake flat here where I live.

Re: How much damage was likely done? [Re: gfh77665] #4786283 06/13/18 08:58 PM
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rooflessVW Offline
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I'd say that if no drivability concerns have manifested, you're probably fine.

Re: How much damage was likely done? [Re: gfh77665] #4786309 06/13/18 10:01 PM
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tcp71 Offline
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Is it leaking in from the transfer case?


2016 F150 Eco: Edge 0w40
2005 Sienna 3.3: NAPA 5w30 syn. (varies)
Re: How much damage was likely done? [Re: gfh77665] #4786310 06/13/18 10:05 PM
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TheLoneRanger Offline
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The problem with overfilling is that the ATF will get up into the gears and air bubbles will be created, then the air mixed with fluid will cause slippage. I doubt if 2 inches overfilled would cause any trouble at all.


Some days you eat the bear, some days the bear eats you.....
Re: How much damage was likely done? [Re: gfh77665] #4786312 06/13/18 10:10 PM
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gfh77665 Offline OP
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Never had any leaks. No issues ever noticed.

Re: How much damage was likely done? [Re: gfh77665] #4786317 06/13/18 10:20 PM
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BrocLuno Offline
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Really to full and it would be blowing fluid out the breather. If that never happened, no big deal smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: How much damage was likely done? [Re: gfh77665] #4786329 06/13/18 11:00 PM
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zorobabel Offline
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Sorry, but I have to ask. Did you check the ATF with the engine running?


1997 Maxima 206k, Castrol GTX Synblend 5W-30, PL14459
2004 Corolla 205k, VWB 5W-20-30, MGL4967
Re: How much damage was likely done? [Re: gfh77665] #4786331 06/13/18 11:04 PM
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gfh77665 Offline OP
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Yes.

Re: How much damage was likely done? [Re: gfh77665] #4786342 06/13/18 11:58 PM
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OneEyeJack Offline
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If it's not broken don't fix it.

Re: How much damage was likely done? [Re: gfh77665] #4786346 06/14/18 12:28 AM
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zeng Offline
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Originally Posted By: gfh77665
...... and I checked the fluid again this week and found the fluid level almost 2 inches above the crosshatch mark......
...... The fluid was still red at the time of change.

My question is, all things considered, how much damage (if any) was done? Should I worry much? Thanks.

No damage.
Move on.

Re: How much damage was likely done? [Re: gfh77665] #4786368 06/14/18 02:56 AM
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demarpaint Offline
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I think you'll be fine, besides, worrying about it isn't going to change a thing. Drive on.


God Bless Our Troops

Re: How much damage was likely done? [Re: rooflessVW] #4786414 06/14/18 05:18 AM
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Trav Offline
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Originally Posted By: rooflessVW
I'd say that if no drivability concerns have manifested, you're probably fine.


+1 Probably nothing. It sounds like it was possibly filled to the full/Hot mark when cold. To move it up the stick that amount doesn't necessarily translate to a whole lot in the pan. I wouldn't loose any sleep over it.


ASE L1, Master. Deutsch Meisterbrief.
Re: How much damage was likely done? [Re: Trav] #4786428 06/14/18 05:42 AM
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Kira Offline
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In line with what Trav just said:

So much fuss was made over checking the fluid in my auto I got the bug to check it several times during a day of local driving whenever I did a drain & fill.

I'd be careful in the first place and have done a few D&F's over the years.

I'd always find level spots to park and follow the method.

The fluid's level would dance about all day long.
I concluded the key was to let the car be still THEN do the gear range row (P to L to P SLOWLY then check level within 20 seconds).

You maybe got a false level reading

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