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Old 02-25-2021, 05:25 PM   #1
gtfoxy
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Two 10L90 transmissions listed for ZL1’s

I was snooping around GM parts direct looking at transmission parts. I noticed they list two 10L90’s. One code 9lgj, the other 9lfj.

Does anyone know the difference? Was one for verts & the other hard tops maybe? Or one for US markets & other non-domestic?

Just curious.

Also, $2,700 for a new one. I really thought it would be more.
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Old 02-25-2021, 05:44 PM   #2
Nightfall ss1le
 
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I believe the ZLE has a different transmission pan than the regular ZL1. It’s also calibrated slightly different, but I doubt it would be a different part number for that.
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Old 02-25-2021, 05:48 PM   #3
h018871
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The RPO codes are different starting in 2020
Other than the pan (thx for reminder Nightfall) there is no physical difference between ZL1 and ZLE transmission, but I understand there is a programing difference

2019 and earlier transmission:
MGL : TRANSMISSION AUTO 10 SPD, 10L90, GEN 1
2020 + transmission:
MI4 : TRANSMISSION AUTO 10 SPD, 10L90, VAR 1, GEN 1

I agree, $2700 seems cheap.
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Old 02-25-2021, 06:56 PM   #4
Nightfall ss1le
 
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Quote:
Originally Posted by h018871 View Post
The RPO codes are different starting in 2020
Other than the pan (thx for reminder Nightfall) there is no physical difference between ZL1 and ZLE transmission, but I understand there is a programing difference

2019 and earlier transmission:
MGL : TRANSMISSION AUTO 10 SPD, 10L90, GEN 1
2020 + transmission:
MI4 : TRANSMISSION AUTO 10 SPD, 10L90, VAR 1, GEN 1

I agree, $2700 seems cheap.
Different code due to the TCM changing in ‘20?
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Old 02-25-2021, 07:34 PM   #5
gtfoxy
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Quote:
Originally Posted by Nightfall ss1le View Post
Different code due to the TCM changing in ‘20?
I could see that.

This was listed under ‘19 model year. Maybe early & late model year.

Might have to check my build codes to see which one mine has.
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Old 02-26-2021, 08:11 AM   #6
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Slight gearing difference on the ZLE.
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Old 02-26-2021, 09:44 AM   #7
h018871
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the 20 up has a different filter

I didn't know there was a gearing difference............ I thought they were the same
this is what i have in my notes for the A10 in the LT4 cars
Final Drive: 2.85
1st: 4.70
2nd: 2.99
3rd: 2.15
4th: 1.80
5th: 1.52
6th: 1.28
7th: 1.00
8th: 0.85
9th: 0.69
10th: 0.64
Reverse: 4.87
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Old 02-26-2021, 09:46 AM   #8
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I was shopping for an a8 and they were cheap too... until you add in the required core charge. I don’t remember the number but it was up there and made the price make more sense.
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Old 02-26-2021, 11:30 AM   #9
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Quote:
Originally Posted by zx9rmal View Post
Slight gearing difference on the ZLE.
Only on the Tremec, the 10L90 has the same gearing in both
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Old 02-26-2021, 12:50 PM   #10
Bumbleboy92
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Don't believe it's changed any gear ratios

https://www.camaro6.com/forums/showthread.php?t=584316

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Old 02-26-2021, 05:44 PM   #11
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ZLE has slight gear shifting.
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