6L80E in a G-body?
TECH Regular
Joined: Jan 2004
Posts: 426
Likes: 4
From: Austin, TX
No adapter needed, but the trans tunnel will need major surgery! The 6L80 is an incredibly deep and wide transmission. I am putting one in an A body, and spent all this weekend fabricating a new tunnel for mine. The trans is also much deeper from the center-line of the output shaft to the bottom of the pan than earlier transmissions, so the pan will hang down more, no matter what! Suprisingly, I was able to use the original crossmember from the Chevelle and it even lined up with one of the sets of holes in the frame.
It will be all worth it when I am done, and can't wait to run the paddle shifters through their paces.
Regards, John McGraw
It will be all worth it when I am done, and can't wait to run the paddle shifters through their paces.
Regards, John McGraw
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Launching!
Joined: Jan 2005
Posts: 272
Likes: 1
From: Northern NJ
From my own research and measurements, the rule of thumb is: If you can fit a T-56 AND a 4L80 in the space available, then a 6L80 (maybe 6L90) will fit." The T56 covers the tall centerline aspect of the 6L80/90, the 4L80 covers the wide centerline aspect.
From what I recall, the A-body pan is slightly lower/narrower than a G-body as it was a pre metric O/D transmission design. As I've seen/heard the T56/4L80 will pretty much interchange in anything '80's and newer with little or no massaging, the 6L80/90 should be a slip fit. This of course depends entirely upon whose motor mounts kit you use.
From what I recall, the A-body pan is slightly lower/narrower than a G-body as it was a pre metric O/D transmission design. As I've seen/heard the T56/4L80 will pretty much interchange in anything '80's and newer with little or no massaging, the 6L80/90 should be a slip fit. This of course depends entirely upon whose motor mounts kit you use.
TECH Resident
Joined: Nov 2009
Posts: 751
Likes: 0
I have a feeling that this is going to be another topic that will depend on the owner's engine placement and how much you are willing to let hang out below the car..
Mine will not be lowered.. it will be stock heightish so i don't have to worry about ground clearance.. I didn't have to touch my trans tunnel for my T56.. It is close but it clears.. I am also currently using the truck oil pan with no issues..
Mine will not be lowered.. it will be stock heightish so i don't have to worry about ground clearance.. I didn't have to touch my trans tunnel for my T56.. It is close but it clears.. I am also currently using the truck oil pan with no issues..
