Originally Posted by Purplehazeir
The double rollers can sometimes cause false knock. False knocks causes your PCM to try and compensate and then your giddy up, giddy goes.
How Kev? I've never heard of this and am intrigued?
A double roller needs to be machined to correct the Austrailian chamfer vs US chamfer on the crank gear and the cam gear needs to be matched up as well. That way the chain has no clearnace issues to the oil pump cover. At first folks figured the cover clearance issue was a simple clearance problem from a larger gear set, in reality it was the chain not being aligned on the gears properly.
Dropping the subframe, it'* possible to do this in around a day. Do a couple of oil changes at 3-5 minutes of running and then 10-20 minutes of running. It'* good practice as some water, dirt and assembly lube will be in the oil.
A fourth clutch hub won't really help breathe new life into the trans. It will help ensure you don't lose 4th gear though. To help that in the meantime, don't go WOT when you are in 4th. Pull back down to 3rd manually and then go WOT. That way the added stress before the trans would normally downshift isn't loaded onto the 4th shaft.