Guys, I am mulling over the possibility of doing the swap. I know its been discussed a lot and I have read every post on it but I am missing something.

I know I need a 4l80e for a 4wd application. I know I need to swap out the input gear on my transfer case to accept the 80e shaft. What I am not clear on is how do I connect the trans and transfer case together from there. Its an NVG-246 NP8 autotrack transfer case. Do I use the tail shaft housing of the 80e or 60E. Do I need an adapter of some sort with either?

 

bolts right up. the conversion adapter (trans to t-case) will be steel instead of aluminum I believe. At least I remember mine being really stout.

 

So you are saying the 80E 4wd tailshaft housing, conversion adapter in your speak , will bolt right up to my transfer case?

 

Yep, there's a skinny metal adapter that goes between the two. IIRC, it's about 3-4 inches wide and just adapts the bolt patterns. If you don't get one with your trans, check a local hard parts dealer. I got mine from TruBest Hard Parts here in Phoenix. I think it was about $35 or so.

 

So its the 80e.

Then something like this.


Then bolt on the transfer case. Sorry if I'm being dense about this. Having a hard time with it. I guess the output shaft on a 4l80e is much shorter than a 60e.

 

That's the one! It also serves as the rear tranny mount too.

 

Thanks guys. I've got it now.

 

Giving up on the ole FLT 60e huh?

 

Considering it. Doing my homework anyway.

 

What is your gear set size? 3.73?
I have 4.10 and am really thinking of stepping up to a 4.56 to offset the long 1st gear ratio in the 80E vs the 60E. Just planting that bug since you will have it all apart anyway.