More ?s to going from a 4l60e to a th400
 

Will my driveshaft fit on my th400 considering i have a 6 inch tail shaft? And will my stock dip stick work as well and if not could i plug it for a little while?

If it's a 6" tailshaft, it won't fit. Stock dip stick won't work. No, I wouldnt plug it, how would you check your fluid level?

All im going to do is plug it tell i get a dip stick. If its a 4 inch tail shaft would it work?

i know you need a new driveshaft either way. The shorter one is stronger. Just buy madmans dipstick it is the best.

Ditto!

The only tailshaft that will work with a stock DS (so I'm told) is a 9" tail housing, but I don't think that will fit properly nor is it as strong as the 4". My Rossler with the 4" tail has a much bigger output shaft to so even the stock slip yoke won't work. I had a custom DS built to my specs for $300 in a day though :).

The madman dipstick is what I run as well. Thunder Racing has them in stock!

Dan