what do I need to 4wd my ep91

Just wondering how I'd go about 4wd my ep91 much appreciated

I think you need the start with an ep95 chassis , then swap the parts over from your ep91.

A lot easier to get an ep95/85 and swap parts over.

If you are serious about doing it, put the ST205 running gear in, here is a quick guide......

Step 1: Buy a grinder.

Step 2: Buy a ST205.

Step 3: Use grinder on both cars.

Step 4: Buy a welder.

Step 5: Weld bits cut off ST205 into EP91.

Step 6: Try to drive it.................keep your fingers crossed.

Step 7: Have an epiphany, scream "fuck that" and buy a EP85/95.