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BeckyD @ James Martin Chevy


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Old 01-28-2021, 10:10 PM   #1
arpad_m


 
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Drives: 2018 Camaro 2SS A8
Join Date: Jul 2017
Location: East Tennessee
Posts: 11,454
8L45/8L90 teardown videos from Transmission Digest

Part 1: https://youtu.be/RUfw3lS4H-Y
Part 2: https://youtu.be/cRYw3Gx13yA

Just found this very interesting education material and thought I'd share. They mention several design changes, including one to the stator support to address delayed engagement ("clunky shift") issues. My 8L90 seems to be a newer unit, because it never had that problem, even before the first flush and the custom PCM tune I'm running.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq

Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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Old 01-30-2021, 12:25 PM   #2
Kevin01Z28
 
Drives: 2018 Camaro 2SS
Join Date: Jan 2021
Location: Louisiana
Posts: 10
Quote:
Originally Posted by arpad_m View Post
Part 1: https://youtu.be/RUfw3lS4H-Y
Part 2: https://youtu.be/cRYw3Gx13yA

Just found this very interesting education material and thought I'd share. They mention several design changes, including one to the stator support to address delayed engagement ("clunky shift") issues. My 8L90 seems to be a newer unit, because it never had that problem, even before the first flush and the custom PCM tune I'm running.
Yep, glad I got the extended warranty. Is there a tcm recalibration that dealers can do to clean up the shift quality and other abnormalities in these 8 speeds?
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2001 Z28 Full bolt on’s, ported 243’s, small cam, FMVB TH400 w/3,800 hard hit stall, 3.42’s. *sold* 😔
2018 SS Camaro A8 1LE replica wheels, bone stock otherwise
2008 F150 Daily driver
2002 Heritage Softail Classic 1.5 inch lower progressive rear springs/monotube fronts, 13" apes, 21" front mammoth spoked wheel, SE 10.5 cr heads, SE 264 cams, Mikuni HSR 42 flatslide carb, V&H pipes
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Old 01-30-2021, 01:04 PM   #3
arpad_m


 
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Drives: 2018 Camaro 2SS A8
Join Date: Jul 2017
Location: East Tennessee
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Quote:
Originally Posted by Kevin01Z28 View Post
Yep, glad I got the extended warranty. Is there a tcm recalibration that dealers can do to clean up the shift quality and other abnormalities in these 8 speeds?
I don't think so, at least my service manager and the senior tech who works on my car at the dealership have checked several times since late 2018, early 2019 and there have been no updates. They gave me a printout last time with the current versions, I can check the one for the current TCM calibration if you're interested.

Most likely no programmers at GM work on refining this transmission anymore, they seem to be running down the clock and hoping for a low warranty concern rate.

You will have better luck with an aftermarket tune once your extended warranty expires, my (impeccable) TCM tune is from Jannetty and I know there are several other reputable tuners as well who have the 8L90 figured out.
__________________
2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq

Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods
JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune

1100 - 1/30/18 | 2000 - 1/31/18
3000 - 2/06/18 TPW 2/26/18
3400 - 2/19/18 | 3800 - 2/26/18
4300 - 2/27/18 | 4B00 - 3/01/18
4200 - 3/05/18 | 4800 - 3/14/18
5000 - 3/16/18 | 6000 - 3/19/18
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Old 01-30-2021, 01:33 PM   #4
Kevin01Z28
 
Drives: 2018 Camaro 2SS
Join Date: Jan 2021
Location: Louisiana
Posts: 10
Quote:
Originally Posted by arpad_m View Post
I don't think so, at least my service manager and the senior tech who works on my car at the dealership have checked several times since late 2018, early 2019 and there have been no updates. They gave me a printout last time with the current versions, I can check the one for the current TCM calibration if you're interested.

Most likely no programmers at GM work on refining this transmission anymore, they seem to be running down the clock and hoping for a low warranty concern rate.

You will have better luck with an aftermarket tune once your extended warranty expires, my (impeccable) TCM tune is from Jannetty and I know there are several other reputable tuners as well who have the 8L90 figured out.
Well, I can't say I blame them honestly for waiting it out. Seems one of the main issues is slow clutch fill times attributed to the piston designs and calibration (both I'm guessing could be fixed/updated if needed). But I'm sure GM won't ever foot the bill for all that.

I would be interested in comparing my tcm calibration to another current version. Should be no harm in just downloading my tune to my laptop as far as warranty purposes go right?
__________________
2001 Z28 Full bolt on’s, ported 243’s, small cam, FMVB TH400 w/3,800 hard hit stall, 3.42’s. *sold* 😔
2018 SS Camaro A8 1LE replica wheels, bone stock otherwise
2008 F150 Daily driver
2002 Heritage Softail Classic 1.5 inch lower progressive rear springs/monotube fronts, 13" apes, 21" front mammoth spoked wheel, SE 10.5 cr heads, SE 264 cams, Mikuni HSR 42 flatslide carb, V&H pipes
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Old 01-30-2021, 02:11 PM   #5
Efi69Cam
 
Drives: 2016 Camaro SS 2017 Yukon Denali
Join Date: Jan 2020
Location: Colorado
Posts: 108
The tech needs to do the clutch relearn procedure correctly. Between the relearn and the fluid flush the 8spds in both my 2016 camaro and 2017 Yukon work very well.
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