Bought a completly stock MTXL used a few weeks back and have been on the hunt for a decent engine and gearing combo for it. I have the OBR signature series 34cc reed ordered. Have all sorts of FID driveline aluminum parts coming housings etc for the diffs. Plus the FID DBXL CD mount and brake assembly. I realize the stock 67T spur won't fit the DBXL FID mount without shimming it. The thing is, with that OBR engine I wonder if I could pull off the 20/61 gearing the DBXL uses. Then no modification would be needed for the FID mount and possibly have a fairly fast MTXL. I am also getting the Vertigo clutch bell and pinion with the Bartalone carrier. Any input would be much appreciated!! Thanks!!!