06-08-2020, 06:22 PM | #1 |
Drives: Camaro SS Join Date: Dec 2015
Location: Washington, DC
Posts: 60
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Will a truck or CTS V 6l90 work in an SS?
Looking to do a 6l90 swap as I’m on my 3rd 6l80. But I can’t seem to find any zl1 6l90s. I’m aware of having to change the crossmember and drive shaft. But my question what will it take to make a truck or CTS V trans work in these cars.
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06-11-2020, 06:43 AM | #2 |
Drives: 2010 Camaro 2SS Join Date: May 2016
Location: Kissimmee
Posts: 158
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I’m interested in this also.Someone has to know this.Back to the top
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06-11-2020, 09:27 AM | #3 |
Drives: Camaro SS Join Date: Dec 2015
Location: Washington, DC
Posts: 60
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I found out the answers to the cts V. But I can’t find any of those for sale either. I’m more interested in these truck 6l90s because they are everywhere and cheap. So I know you may have to change the shaft and yoke. But are gear ratios, valve body, and everything else the same?
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06-11-2020, 03:59 PM | #4 |
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The 6L90 is a heavy-duty version of the 6L80 six-speed automatic, with a
strengthened input gearset that has two additional pinion gears (six in total) and a strengthened output gearset that uses wider gears than the 6L80. Its flexibility extends to the clutches, where the 6L90 has one more clutch plate in each clutch than the 6L80 for heavy-duty applications. There is also a 6L90 version without the additional clutch plate to more closely match application requirements, where appropriate. The 6L90 shares about 75 percent of the parts as the 6L80, although the case of the 6L90 is 35 mm longer than the 6L80 case. The 6L90’s case also accommodates additional fasteners between the transmission and the transfer case for improved driveline noise/vibration performance. Gear Ratios First: 4.030 Second: 2.360 Third: 1.530 Fourth: 1.150 Fifth: 0.850 Sixth: 0.670 Reverse:3.060 Vehicles: Cadillac CTS-V Sedan, Coupe, Wagon Chevrolet Camaro ZL1 Chevrolet Express CNG Chevrolet Express LPG (Cutaway) Chevrolet Express (Cargo, Passenger, Cutaway) Chevrolet Silverado HD GMC Savana CNG (Cargo, Cutaway) GMC Sierra HD https://www.repuestoscambiosautomati...f142_6l80e.pdf https://www.trucktransdiag.com/downl...nical_tips.pdf http://d2q1ebiag300ih.cloudfront.net...0-ZIP-IN_D.pdf |
06-12-2020, 04:52 PM | #5 | |
Drives: Camaro SS Join Date: Dec 2015
Location: Washington, DC
Posts: 60
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Quote:
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06-13-2020, 05:20 AM | #6 |
Drives: 2010 Camaro 2SS Join Date: May 2016
Location: Kissimmee
Posts: 158
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I Think you could get a one piece driveshaft made with the correct slip yoke so you wouldn’t have to change the rear output shaft.Now I still don’t know if the mounting position is compatible. And if you can just swap transmission computer from the 6l80e to the 6l90e like you can with the zl1 and cts-v version.
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06-14-2020, 09:05 PM | #7 | |
Drives: Camaro SS Join Date: Dec 2015
Location: Washington, DC
Posts: 60
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Quote:
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06-15-2020, 10:56 AM | #8 |
Drives: '11 Caprice PPV Join Date: Apr 2017
Location: NC
Posts: 9
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Came here to post basically the same question, so I’ll contribute here instead and hang on for answers.
The output shaft spline counts are different between the 2WD and 4WD truck 6L90s. The 2WD truck trans uses a 36 spline output. The 4WD uses a 29 spline output. Now, interestingly enough, the ZL1 6L90 also uses a 29 spline output. Novak lists the total length from bellhousing to output shaft of a 4WD 6L90 as 28.559”. I can’t find the same length measurement for a ZL1. IF the 4WD truck trans and ZL1 trans have the same length from bellhousing to tip of output flange, it would imply that a ZL1 tailhousing and yoke could be used on a truck 4WD trans. Knowing the penny pinchers at GM, it’s just possible that’s the only difference between the two. The 2WD 6L90, in addition to having a 36 spline slip yoke output shaft, is also longer than the 4WD version. |
06-15-2020, 11:10 AM | #9 |
Drives: '11 Caprice PPV Join Date: Apr 2017
Location: NC
Posts: 9
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Further research shows we probably aren't so lucky. Advance Adapters has a trans guide that shows the 4WD truck, 2WD truck, and 2WD fixed yoke (ZL1/CST-V) trans output shafts. While the length between 4WD truck and LSA trans appears to be very similar, the 4WD truck trans is missing the o-ring and threaded extension to hold on the yoke of the passenger car 6L90.
I don't see why one couldn't run a 2WD truck trans with a custom driveshaft and crossmember though. In fact, your driveshaft would work out being a bit shorter than with a ZL1 trans, which is a good thing. Link with photos and measurements: https://static.summitracing.com/glob...dd-50-9600.pdf |
06-15-2020, 03:35 PM | #10 |
Drives: 2010 camaro ss, 2012 ZL1, 2021 LT1 Join Date: Oct 2009
Location: Iowa
Posts: 128
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I purchased a truck 2wd 6l90 last year. Have not installed it yet. I also purchased
a ZL1 tailhousing to compare to the truck 6l90. It looks like the mounting pad is the in the exact same spot. I think a ZL1 crossmember could be used with a custom drive shaft from a place like DSS. |
06-15-2020, 03:48 PM | #11 |
Drives: 2010 camaro ss, 2012 ZL1, 2021 LT1 Join Date: Oct 2009
Location: Iowa
Posts: 128
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06-15-2020, 04:19 PM | #12 |
Drives: '11 Caprice PPV Join Date: Apr 2017
Location: NC
Posts: 9
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Quint,
I agree. Visually, the 2WD truck trans and ZL1 trans appear as if they could use the same crossmember. The numbers I pulled in my first post were from Pace Performance, but they don't match up with the Advance Adapters specs on the 4WD trans. I don't know which to believe, but have had very good experiences with Advance Adapters technical information in past builds. I wonder why GM developed special fixed yoke tailhousings and output shafts for the 2WD passenger car applications. |
07-20-2021, 09:13 PM | #13 |
Drives: 2011 camaro 2ss/RS Join Date: Nov 2013
Location: Waycross, Ga
Posts: 80
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Bump any new info
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11-22-2022, 08:23 AM | #14 |
Drives: 2014 Camaro SS Join Date: Feb 2022
Location: Houston, Tx
Posts: 53
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Has anybody found a definitive answer on what 6l90's will work in our cars and what won't? Zl1 transmissions are getting harder to find and truck versions are everywhere. It seems like the only hurdles would be getting a custom driveshaft and trans mount made. I'd hate to jump into a project like that and find out after a bunch of work and money that it won't work for some oddball reason though.
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