Ive no experience of what your issue is but if your keeping the car and you are dropping the box out anyway look into replacing the large bearing seal , its a common issue and pisses out oil when it starts to go and contaminates the clutch. http://www.ebay.co.uk/itm/GENUINE-VM-REAR-CRANKSHAFT-OIL-SEAL-KIT-CHRYSLER-VOYAGER-2-5-CRD-2-8-CRD-/331462918896?pt=LH_DefaultDomain_3&hash=item4d2cbac2f0 Expensive for what it is but better than it going further down the line, if your looking for factors of the bits this engine is also in fx4 taxi cabs.