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Old 11-01-2011, 11:20 PM   #1
JetSnake
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Default transmission fluid change

I plan on dropping the pan to change the oil and the filter, but without a dip stick, I was wondering how to fill the transmission. I never looked at it yet, but didn't know if I need a special tool for this.
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Old 11-02-2011, 01:35 AM   #2
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When I am ready to get this done I am having the dealer do this. The 6L80E is a sealed unit which means checking the fluid is not required. And even so I have not found the filler neck on mine if there is one...
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Old 11-02-2011, 06:09 AM   #3
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I believe it is set up like a manual transmission. There should be a fill hole on the side of the transmission body. You just fill it with fluid until it starts coming out the fill hole.

Im about to do my transmission and diff fluid change as well.
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Old 11-02-2011, 07:49 AM   #4
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I've been told to flush the system, including filter. Filter is metal I believe.
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Old 11-02-2011, 08:48 AM   #5
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I would DEF have the dealer do it, especially if you're in warranty range - they will flush the system and clean the filter and will use the correct GM fluid, its worth having them do it for peace of mind IMO
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Old 11-02-2011, 09:13 AM   #6
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I went to the dealer yesterday to have this done, i was out of warranty and they still did it for free!
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Old 11-02-2011, 01:47 PM   #7
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^You got hooked up my friend! I had to pay at 45k, and I'm assuming I'll have to pay again next time at 90k
But hey, I get free cappuccino lol
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Old 11-02-2011, 01:52 PM   #8
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How much did the deal charge for this?
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Old 11-02-2011, 02:10 PM   #9
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Quote:
Originally Posted by millatime84 View Post
How much did the deal charge for this?
Most dealerships will have coupons on their website. Find the closest GM dealership with such coupon and save.

I had a 20% off voucher, can't remember how much I paid tho.
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Old 11-02-2011, 04:48 PM   #10
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dealer wanted 250 for a tranny flush. my buddy has the auot tranny machine and.did it for 100
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Old 11-02-2011, 05:29 PM   #11
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Did mine today. The filter that O'Riley specified was wrong. It was for a 6L80E, but not for the g8's shallow pan. I used solvent to rinse out my old filter and re-used it. I called the GM dealer, but they were not showing the part # in the computer that was stamped on the AC Delco filter I was holding in my hand. (24235900)

To re-fill, I just put a tip off of a gear oil bottle onto what ever quart I was using at the time, attached a rubber hose, and stuck it in the filler / dipstick hole on the right side of the tranny and squeezed the bottle. There is a easily removable / replaceable rubber plug blocking the hole. You know it's full when fluid comes out of the hole in the middle of the pan after getting the tranny up to temp. There is a picture on the bottom of the tranny pan that depicts how to determine if it is full.
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Old 11-02-2011, 06:54 PM   #12
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How often do you really need to change trans/diff fluid?
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Old 11-02-2011, 09:17 PM   #13
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The tranny is a seal unit... The best way is a flush... the unit flushes All the fluid from the filter and converter, valve body, etc. not just the couple quarts you get by dropping the pan....
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Old 11-02-2011, 10:06 PM   #14
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I did mine with almost 60,000 miles. A complete flush is better, but the fluid didn't look that bad and there was hardly any sludge on my magnet. I completely cleaned the pan, flushed my filter with solvent, and put 5 quarts of synthetic fluid back in.

Better than nothing and only cost $40.00. I will try to do a full flush at 100,000.
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Old 11-02-2011, 10:21 PM   #15
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My buddy works at a Chevy dealer, had him do the flush at 56k miles.
I stood and watched, and the fluid coming out was pretty dirty compared to the bright red fluid going in. I think I paid $140 for the flush, good peace of mind knowing it has been done now and good for another 50k miles.
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Old 11-03-2011, 05:59 PM   #16
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@btr1208, that is very cool. Seems as though you may have found a "keeper" for a dealership.

I hope that you are having a great evening.

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Old 11-04-2011, 01:41 PM   #17
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Quote:
Originally Posted by smso966 View Post
There is a easily removable / replaceable rubber plug blocking the hole. You know it's full when fluid comes out of the hole in the middle of the pan after getting the tranny up to temp. There is a picture on the bottom of the tranny pan that depicts how to determine if it is full.
I think this is the fill plug SMSO966 is talking about (circled it in red)....
Attached Images
File Type: jpg 6L80E FILL HOLE.JPG (40.3 KB, 724 views)
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Old 12-22-2012, 07:23 PM   #18
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i want to do my trans flush and diff fluid chamged my car has 80k what are your thoughts on doing this
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Old 12-23-2012, 09:19 PM   #19
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Quote:
Originally Posted by HotRodG8 View Post
The tranny is a seal unit... The best way is a flush... the unit flushes All the fluid from the filter and converter, valve body, etc. not just the couple quarts you get by dropping the pan....
you have not tried it, have you?

A flush does not change the filter. For the price of a dealer flush, you can get the camaro deep sump pan and filter (PACE), buy the 8 quarts of synthetic fluid, and still have enough for a six pack of beer.

"couple of quarts..." hmmm...
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Old 12-26-2012, 02:21 PM   #20
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In other vehicles (non GM), I have always loosed the tranny pan bolts and then drain. Change out filter, clean off pan magnet, wipe out bottom of pan, measure what came out, and add that amount back in. I've done that every 30k on a few of my cars and trans are still running strong another 100k+ later.

I have yet to do the G8 and I'm sitting at 96k. I know I'm due so I probably use the same method. Never heard anything good about flushes- seems like it would just move all the contaminates around and filter out very little.
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