HI,LOOKING FOR A 4 SPEED HEAVY DUTY GRANNY GEAR TRANSMISSION-I THOUGHT IT WAS A SM420 BUT IT IS NOT,THE BOLT PATTERN ON THE BELL HOUSING IS SMALLER THAN THE SM420-WHAT KIND OF TRANS DO I HAVE,AND WHO IT WAS MADE BY-THANK YOU VERY MUCH FOR YOUR HELP-KEEP EM ROLLING-46 2TON GUY-KARL :confused: