I have a 3500 and mind is under the driver seat
On the back of the motor next to the transmition.
The ECM on the Vandura 2500 is under the Driver's seat.
fuel filter has to be changed every 8000 miles or sooner if it plugsup sooner
Water Pump? Start by inspecting your hoses first it may just be a clamp.
Do a vin number check and it will tell you i think its 6001-7000LBS hydrulic beaking system
There are to sizes 110"and 125".
4L80E is in most vanduras of one ton 2500 and below is 4L60E
.all I can say is my '92 2500 vandura has a 350 in and it does the job...don't know if all of 'em are the same size or not dt