6L80E slips in first and second? - Pontiac G8 Forum: G8 Forums - G8Board.com
Drivetrain Tech 5L40 A5 / 6L80 A6 / TR6060 M6 / ZF Rear Diff

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post #1 of 17 (permalink) Old 03-20-2017, 02:46 PM Thread Starter
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6L80E slips in first and second?

At WOT it feels like the transmission slips for about a second at the top of first, and then again at the top of second.

Fluid level is correct via the GM fill / check procedure.

Any tips or common areas I should look at when it goes in for repair?

2008 G8 GT - Grey / Black - stock with a tune - 13.30 @ 105
2002 Trans-Am - Navy Blue Metallic / Black - M6 - Heads, Cam, N20 - 11.23 @ 127 - 525 RWHP
1991 Corvette - Black / Black - M6 - 383 - 11.37 @ 122 NA - No nitrous times - 415 RWHP NA - 550 RWHP N20
1989 Mustang LX - Gun Metal Grey / Black - M6 - Heads, cam, some other stuff - 12.57 @ 109
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post #2 of 17 (permalink) Old 03-20-2017, 04:05 PM
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How many miles on the trans?
Mine did that for a bit when I was around 95k miles. I had a deep camaro pan and widemouth filter put on at 100k service. This seemed to be a pretty common upgrade for other board members. Haven't had that feeling since. I can't be sure if it was just old fluid or the pan/filter that make the difference, probably both. Others may know more.

08 G8 GT - PBM Sport & Premium, Tint, Sunroof, Splash Guards, 255/40zr19 Nitto NT555 G2
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post #3 of 17 (permalink) Old 03-20-2017, 04:08 PM
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The internal solenoids maybe shot. I had an estimate of $1,000 to get it fixed I just went out and bought a remanufacture transmission for $3000 with a 3 year warranty. I know it's a lot of money but I was thinking about the warranty.

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post #4 of 17 (permalink) Old 03-20-2017, 04:42 PM
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LOTS of variables here.

Fluid level incorrect
Bad seals
Burnt clutches
Bad trans tune
etc

Have it checked out by a professional
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PBM G8 GXP M6-Self flex fuel tune,OBX LTs, Kooks A/B, Monster Stg 3 clutch, LSA S/C, cam, fuel system, stock block and stock heads.
Best e.t 10.81/ best mph 135 Half Mile: 166.9 mph
2007 TBSS-Self tune, bolt ons 13.06@106.7, 2,200 D.A
1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A
2002 Bonneville SSEi- Self tune, 3.4" pulley, FWI. The beater
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post #5 of 17 (permalink) Old 03-20-2017, 04:48 PM
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That's y I just went 4 a new trans.

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post #6 of 17 (permalink) Old 03-20-2017, 07:35 PM Thread Starter
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Originally Posted by Freeze View Post
How many miles on the trans?
Mine did that for a bit when I was around 95k miles. I had a deep camaro pan and widemouth filter put on at 100k service. This seemed to be a pretty common upgrade for other board members. Haven't had that feeling since. I can't be sure if it was just old fluid or the pan/filter that make the difference, probably both. Others may know more.
115K on the car, I bought it used, so I assume there is 115K on the trans. Maybe I'll try the deep pan and filter before taking it to the dealer.

2008 G8 GT - Grey / Black - stock with a tune - 13.30 @ 105
2002 Trans-Am - Navy Blue Metallic / Black - M6 - Heads, Cam, N20 - 11.23 @ 127 - 525 RWHP
1991 Corvette - Black / Black - M6 - 383 - 11.37 @ 122 NA - No nitrous times - 415 RWHP NA - 550 RWHP N20
1989 Mustang LX - Gun Metal Grey / Black - M6 - Heads, cam, some other stuff - 12.57 @ 109
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post #7 of 17 (permalink) Old 03-20-2017, 07:37 PM Thread Starter
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Originally Posted by STAGEUP View Post
LOTS of variables here.

Fluid level incorrect
Bad seals
Burnt clutches
Bad trans tune
etc

Have it checked out by a professional
The fluid level is correct, and it does it on the stock tune or the modified tune; but all the other variables you mentioned are in play.

It's under warranty, I'll shoot it by the dealer and see what happens.

2008 G8 GT - Grey / Black - stock with a tune - 13.30 @ 105
2002 Trans-Am - Navy Blue Metallic / Black - M6 - Heads, Cam, N20 - 11.23 @ 127 - 525 RWHP
1991 Corvette - Black / Black - M6 - 383 - 11.37 @ 122 NA - No nitrous times - 415 RWHP NA - 550 RWHP N20
1989 Mustang LX - Gun Metal Grey / Black - M6 - Heads, cam, some other stuff - 12.57 @ 109
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post #8 of 17 (permalink) Old 03-21-2017, 11:05 PM
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Originally Posted by Josh Kinzey View Post
The fluid level is correct, and it does it on the stock tune or the modified tune; but all the other variables you mentioned are in play.

It's under warranty, I'll shoot it by the dealer and see what happens.
Please post what you find out. I'm having the same issue with my car I bought 6 weeks ago with 111,000 miles on it. It doesn't seem to have a problem under regular driving and doesn't seem to slip at all when getting on it from a stop. I've already bought the Camaro pan and will be putting it on this weekend. I will post back with my results from the new pan and fluid. Thanks.
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post #9 of 17 (permalink) Old 03-22-2017, 08:34 AM
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Few ideas.


I know you have the stock stall, but these transmissions are very sensitive to fluid levels. When doing a stall we always put in an extra quart and it seems to help. If not, some cars experience a weird slipping feeling on occasion.

Flares...... At the top of second(going into third) they are also very susceptible to flaring with some tunes(I've seen a few do it with stock tunes in certain settings). You did say it is now doing it with the stock tune, though, right?


I'd add fluid even if it shows that its coming out when hot idle in park and if not good bring it in for repair since you're under warranty!
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post #10 of 17 (permalink) Old 03-22-2017, 09:12 AM
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Originally Posted by I8a5oh View Post
The internal solenoids maybe shot. I had an estimate of $1,000 to get it fixed I just went out and bought a remanufacture transmission for $3000 with a 3 year warranty. I know it's a lot of money but I was thinking about the warranty.

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Originally Posted by I8a5oh View Post
That's y I just went 4 a new trans.

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Wow. $3k for a stock 6L80. For another @ $1k you could've had a built 6L90.
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post #11 of 17 (permalink) Old 03-22-2017, 09:14 AM
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Wow. $3k for a stock 6L80. For another @ $1k you could've had a built 6L90.
That's what I was thinkin. Haa

PBM G8 GXP M6-Self flex fuel tune,OBX LTs, Kooks A/B, Monster Stg 3 clutch, LSA S/C, cam, fuel system, stock block and stock heads.
Best e.t 10.81/ best mph 135 Half Mile: 166.9 mph
2007 TBSS-Self tune, bolt ons 13.06@106.7, 2,200 D.A
1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A
2002 Bonneville SSEi- Self tune, 3.4" pulley, FWI. The beater
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post #12 of 17 (permalink) Old 03-22-2017, 09:19 AM
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Originally Posted by Josh Kinzey View Post
and it does it on the stock tune or the modified tune;
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It's under warranty,
You sure about that?
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post #13 of 17 (permalink) Old 03-22-2017, 11:10 AM
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I was going for the warranty 3yr, 36000 miles, every day driver, other people were only giving me 1yr 12000 miles

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post #14 of 17 (permalink) Old 03-24-2017, 01:13 PM Thread Starter
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Originally Posted by MGMGXP View Post
You sure about that?
It's an aftermarket warranty company, so anything is possible. In my experience the aftermarket companies are pretty sleazy and will do most anything to get out of paying a claim.

I plan to return the tune to stock before taking it in, but if the tune voids the warranty, it is what it is. Regardless, I need the car fixed.

I am hesitant to change the tune to stock and take in for warranty because of the ethical concerns associated with that, I don't want to lie to them. However, you, me, them, and everyone else knows that the tune did not cause the transmission to act up. It was doing it before the tune, does it with the tune, and does it if I flash the stock tune back into the car. So, from an ethical standpoint, it shouldn't matter that the car has been tuned. I understand it though if the company decides to deny coverage based on a few clicks in HP Tuners.

2008 G8 GT - Grey / Black - stock with a tune - 13.30 @ 105
2002 Trans-Am - Navy Blue Metallic / Black - M6 - Heads, Cam, N20 - 11.23 @ 127 - 525 RWHP
1991 Corvette - Black / Black - M6 - 383 - 11.37 @ 122 NA - No nitrous times - 415 RWHP NA - 550 RWHP N20
1989 Mustang LX - Gun Metal Grey / Black - M6 - Heads, cam, some other stuff - 12.57 @ 109
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post #15 of 17 (permalink) Old 03-24-2017, 01:16 PM
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Its a remanufactured transmission from gm and was installed by a gm dealer

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post #16 of 17 (permalink) Old Today, 08:14 AM Thread Starter
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Its a remanufactured transmission from gm and was installed by a gm dealer

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In my car? Out of curiosity, how would you know that?

2008 G8 GT - Grey / Black - stock with a tune - 13.30 @ 105
2002 Trans-Am - Navy Blue Metallic / Black - M6 - Heads, Cam, N20 - 11.23 @ 127 - 525 RWHP
1991 Corvette - Black / Black - M6 - 383 - 11.37 @ 122 NA - No nitrous times - 415 RWHP NA - 550 RWHP N20
1989 Mustang LX - Gun Metal Grey / Black - M6 - Heads, cam, some other stuff - 12.57 @ 109
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post #17 of 17 (permalink) Old Today, 12:14 PM
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In my car? Out of curiosity, how would you know that?
He's referring to the $3k reman trans he had put in his car. I'd never go that route, but he wanted the 3 year warranty. If I were you I'd start here: 6L80E/6L90E/8L90E/6T70E Transmission Tuning | 6L80E / 6L90E Tuning
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