cat is prob part blocked take the bolt out of the front of the cat and run it that is if it has one if no then take the cat off and check it deff sounds like a blocked cat
knowing my diff aint coming for 2weeks i now have re biult my engine and put the box in and went 4 a road test and wow the difference is big it now has more torque and pulls like mad after 5000 reves deff need the diff now
done the chains 2day the lower guides were well worn so was a good job i am doing all this now ..the diff has not bin sent yet as i found out 2 day so that is going to put me behind... bummer