Hey skawty!
As Pux had mentioned earlier, the Pro-Pulse and Team Associated diffs are indeed similar! So if you want to go ahead and replace your diffs, then check this out. I needed to replace the diffs in one of my Pro-Pulse T100's, and I posted this pic in one of my earlier threads, but here you go.
This is a picture of my blown Pro-Pulse differential outdrive and the RC18MT differential I replaced it with.
As you can see, the Team Associated diffs are a direct fit. I'd recommend that you replace the whole unit, instead of trying to salvage parts from the Pro-Pulse.
Use Team Associated part #21024 - Complete Differential Kit $8.99
(click the link to see a picture of it)
http://aedownloads.com/downloads/item_photos/21024.jpg
You might as well replace your input gear while you're at it!
That would be part #21022 - Differential and Input Gear $3.99
(click the link to see a picture of it)
http://aedownloads.com/downloads/item_photos/21022.jpg
You're going to have an extra Diff gear, but you can keep it as a spare!
Now, if you want to take it to the next level, then you might want to invest in MIP Super Diffs!
#1444 MIP Super Diff for Assoc. 18T/18MT/18B $19.95
(You will still need to purchase the Team Associated Diffs to complete)
*Note* if you need directions on how to build the diffs, then click on the link for the Team Associated RC18T manual.
http://aedownloads.com/downloads/manuals/18t_manual.pdf
turn to page 3