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What transmission is this?

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Old 03-16-2012, 05:08 PM
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Question What transmission is this?

i swear its only a 30 spline out put shaft after i took off the transfer case (it was a very long day but Ill go count again tomorrow) pic posted is the sticker on the side of the trans help please?!
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Old 03-16-2012, 08:11 PM
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where on the trans is it located? do you have a full pic of the trans?

here is 1 of my pics. the 60e is on the left. and the 80e is on the right. The tags are in different locations.
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Old 03-16-2012, 08:30 PM
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its a six speed from a 2008 sierra its behind a ly6 im trying to figure out if its a 80or 90e I just double checked its 29 spline here is a pic
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Old 03-16-2012, 09:37 PM
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im pretty sure the 90's were only in 3/4 tons and up and the 80's are in 1/2 ton platforms.
Old 03-16-2012, 09:47 PM
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I need to find measurements that are known to be correct, I haven't found two overall measurements to be the same .would like to know length with or without bellhousing 4wd unit
Old 03-16-2012, 10:12 PM
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im getting right about 47" from bellhousing to end of transfer case in an 08' AWD Denali. i say "about" because it was the closest i could get measuring around stuff. I measure the transfer case as "about" 23.5" so that makes the transmission "about" 23.5" as well.

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Old 03-16-2012, 10:43 PM
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This came off of a TBSS forum:

AWD/4WD Transmission-bellhousing to end of output shaft (bellhousing to end of case)
4L70: 26.875" (22.25")
6L80: 27.125" [+.250"] (23.3")
6L90: 28.625" [+1.750"] (24.7")
4L80: 29" [2.125"] (26")
Old 03-17-2012, 01:36 AM
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Originally Posted by mitchellmade
its a six speed from a 2008 sierra its behind a ly6 im trying to figure out if its a 80or 90e I just double checked its 29 spline here is a pic

You have a 6L80E.
Old 03-17-2012, 08:28 AM
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Originally Posted by midevil1
You have a 6L80E.
Wrong, he does not.

It's a 6L90E from an LY6 powered 2500HD. The 2500HD pickup trucks never came with a 6L80E. The glove box RPO code will be MYD for that transmission. 8DKA is a GM identifier for a 6L90E.
Old 03-17-2012, 06:04 PM
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Originally Posted by 1994Vmax
Wrong, he does not.

It's a 6L90E from an LY6 powered 2500HD. The 2500HD pickup trucks never came with a 6L80E. The glove box RPO code will be MYD for that transmission. 8DKA is a GM identifier for a 6L90E.
with a 29 spline output shaft??? NEVER seen a 90 with the smaller output shaft. Didn't know they made a 2500HD AWD setup either... Somebody was throwing stuff together that week.


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