...Carlog what is the vehicle? Sounds like the problem I had...I got around it buy putting an E-Savage 66t 32 pitch spur onto a Hellfire diff...That means i can use 32 pitch pinions for the E-Sav / E-Maxx on my 3.2 shaft :D This MIGHT help you...maybe not...

*Check the HPI Brimstone thread in the TRUGGY section...I KNEW i put that thread in the wrong place...

EDIT: SORRY!! Forget ALL that...I just realised youHAVE a 5mm shaft and 3.2 pinions...They have the right pinions in the shop here...Shipping prices might kill you though :P