[Overdriven]

If you're going the eBay route look for 3905 emaxx or 4908 tmaxx diffs. These models are said to be stronger, and are also sealed units like the revo. All 3.3 models have the 4 screw plastic diff cases so you can't tell that way. Best is to ask what model they were pulled from if they don't list the model number. Btw a pm will be there in a few minutes.