I was aware of that, I just thought the 4907 diff was also the same diff used in the 3905, and that isn't the case. What I am getting at is that there are (at least) 4 revisions of the maxx diffs...and I got the second from the top as far as strength goes. I was wondering how much better the top end diff was.

Here is how the progression happened:

1st was the original 2-screw diff on the first t-maxx and first e-maxx models (non-wide versions) this was the diff that couldn't take power AT ALL.

2nd was the 4-screw diff used in the widemaxx 3906 (this diff has 4 silver screws)

3rd was the 4-screw diff with black screws used in the 4907 3.3 (and others)

...and finally they made the newest diff that has the nicer pins and a stronger cup (for the 3905 and up model trucks)


At least that is how I have picked up on the long history of the maxx. It is a lot of data to retain, no wonder I bought the wrong parts.