Right, my point was just with the stock driveshafts itself.

 

The factory shaft is weak from both torque capability and critical speed. For high power, I don't know what level people are ditching the stock shaft, however, lots of people even with factory power levels chuck the factory 2wd shaft because of exceeding critical speed.

 

6" alumimum driveshaft, damn i didnt know they made one that big. I thought 5" was the biggest one they made lol.

 

Thanks guys!! I have my drive shafts out and the front one is heavier than the rear one haha. I'm going to a 4l80e swap but the drive shafts should be damn close to the same length. I'll see if I can keep the front one and get a new rear shaft made up just to be safe then!

 

My 80e swap needed a new front and custom rear.

 

Do you know the length differences? The 4l80 is a little longer but the transfer case adapter is shorter so I figured it would be close haha

 

1 11/16 or something.... May be different on nnbs though....

 

This is the difference between the t case adapter between the 6l80 and 4l80

 

That sounds right.

Also my custom driveshaft is steel good to 130mph+ and 600ftlbs at the wheels according to the specs and dimensions I provided the builder. I have a Yukon so my shaft length wasn't too much. I also valued strength and lower $$ over low 1/4

 

I gotta get the t case on the trans then I can get some measurements. Here's some pics of how the cross member and the mount were. It was about an inch and a half or so back from where the 6l80 mount bolted. So I cut the cross member and got that all welded up. Little overkill but rather it be sturdy!