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Old 02-16-2018, 02:05 PM   #1
DiGiam
 
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6l90 transmission

How smooth is the 6L90 transmission. I've got a 16 camaro ss and the A8 is the worst transmission GM has made and has given me nothing but trouble. I'm looking at 5th gen ZL1's but just wondering how the 6L90 is in daily driving. Once you modify the car does it still shift good or will it have issues. Just curious. Thanks in advance
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Old 02-16-2018, 03:36 PM   #2
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Quote:
Originally Posted by DiGiam View Post
How smooth is the 6L90 transmission. I've got a 16 camaro ss and the A8 is the worst transmission GM has made and has given me nothing but trouble. I'm looking at 5th gen ZL1's but just wondering how the 6L90 is in daily driving. Once you modify the car does it still shift good or will it have issues. Just curious. Thanks in advance
I've had my 2013 ZL1 for over two years with mods, cam, headers, etc., and been happy with it. This week I had a FTI 3600 stall put in and ID850 injectors and tune, and wow, i REALLY like it.
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Old 02-16-2018, 04:31 PM   #3
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If you or your tuner know what you're doing it is a great trans but a bad tune will trash it very quickly...and its a lot different than tuning a 4l80. Leave all or most of the torque management and make subtle time and pressure changes and it will take a lot of power.
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Old 02-16-2018, 05:56 PM   #4
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How is it in part throttle daily driving. That's where the A8 that's in the 6th gen camaro is horrible. Harsh shifts and really jerky.
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Old 02-16-2018, 06:15 PM   #5
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I thought there was a TSB for the A8 — including the torque converter shutter during shifts.

May want to ck that first. Dealer should retune the trans under that...

-Don
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Old 02-16-2018, 10:18 PM   #6
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I've had it flushed 3 times, converter changed, and reprogrammed. It's just inherent to the A8. They ever had us switch to the new Dexron HP fluid and that didn't help anything. It's just a pretty lackluster transmission. Looks like the 2019 with have the A10 which has proven to be a much better transmission.
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Old 02-16-2018, 10:56 PM   #7
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Wow, yep sounds like a dud...

Thanks for the info...

-Don
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Old 02-17-2018, 12:19 AM   #8
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One more option:

https://www.mobil.com/English-US/Pas...etic-LV-ATF-HP

For those hard cases — gm Recommends this now when Dexron HP fails

-Don
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