I am puting a NV4500 in my 96 and the book shows some sort of dust cover between the bellhousing and the motor. I was reading in the manual and it says nothing about installing one other than that on the NV3500's that they may be equiped with one. I'm not sure if the truck needs one or not since it was an automatic and I'm converting it to a manual. Has anyone who has ever removed their manual remeber seeing a dust cover? Is this dust cover even necessary. Thanks. Matt