6L80e Swap

[johnfl]

Hi Guys, i have a 1976 C20 rwd truck that I'm swapping an LS into and currently I'm keep flip flopping between a 4L80 or a 6L80. Im leaning towards the 6L80 due to the gear ratios and the fact im wanting to travel in the truck. However, i keep finding conflicting information that you need to cut the floor to fit the 6L80. My floor is a low hump being an Auto. I dont want to cut the floor.

Can anyone confirm if you can for a fact fit the 6L80 without cutting the floor?

Thanks for your time.

 

[johnfl]

I think i have put this in the incorrect section and should be under a transmission thread sorry.

 

[CalSgt]

6L80 is big but it seems to me there is more bulk on the bottom (down low), it’s not much bigger than 700R4 up top. Seems like the 6L80’s are more plentiful since they were in so many Yukon Denali’s, Ecalades, Camaro’s etc. where the 4L80’s were primarily in heavy pick ups

I haven’t swapped one in a square but they are wedging 6L80’s in classic XJ6 Jaguars without modifying the body

 

[johnfl]

6L80 is big but it seems to me there is more bulk on the bottom (down low), it’s not much bigger than 700R4 up top. Seems like the 6L80’s are more plentiful since they were in so many Yukon Denali’s, Ecalades, Camaro’s etc. where the 4L80’s were primarily in heavy pick ups

I haven’t swapped one in a square but they are wedging 6L80’s in classic XJ6 Jaguars without modifying the body

Thanks for the info. I appreciate that. I find it odd there is limited info out there.

 

[CalSgt]

Thanks for the info. I appreciate that. I find it odd there is limited info out there.

There are a few comparisons of the outside dimensions on the interweb...

 

[Camar068]

depending on generation of LS ur getting, you may need to get a seperate controller for the 6l80.....about $1,000.

And not knowing for sure, the 4l60/4l80 will last longer and cheaper to rebuild compared to 6lxx series. Correct me if I'm wrong for those that know. Those are the reason's I haven't converted mine to 6lxx.

Sonnex has a kit to change the ratio of the 4l60e. I've not done it again because of the cost ($900). Link Below.

2.84 Ratio Input Carrier Kit

 

[TotalyHucked]

My buddy put a 6L80 in his C30 with the low floor, no issues. I found these for reference on the google:

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4L60 vs a 6L80

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But cutting the floor isn't a big deal if ya had to. We've got the high hump cover at AMD, throw some rivnuts in the floor and bolt it in, buy high hump carpet and you're done

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