Bill
The belt is 138 inches or 3505 mm made special order from Dayco,not available from Dayco, only Muncie.Dayco belts are suspect quality at the best of times IMO and this might be the problem on my Truck.What seems to happen is when cold you get a belt squeel(for lack of better word) that gets worst as time goes on until it is there all the time.After much research have found that what is maybe happening is the cord inside of the ribs is coming loose and when cold is making a noise.The reason it goes away when it warms up is the heat from the belt makes the cord a little tighter in the rubber and noise is gone until finally it is so loose it makes the noise all the time.Tried Gates belts they do not make a belt the right size in 6 or 8 rib so no answer there.Do to the construction of the belt it is possible to remove 2 ribs without damaging the belt so I am told and seems to work.The reason that I used the Ford belt is for two reasons 1) price is $40.00, Muncie $128.00 cdn, have to change every 6 months 2)maybe it is not a Dayco belt and will last longer, maybe forever ha ha.Also the bracket that is used to hold the pump on the motor has only two bolts that hold it in place and are at the very front of the pump and allow it to vibrate a little.I had a constant vibration at 800 to 850 rpm since Truck was new thought it was everything downpipe bracket,exhaust,etc.One day while looking at the pump moving, stuck a wedge between back of pump and rad hose connection on top of motor and vibration gone
Pissed me off poor design had that vibration for 6 months driving me crazy.By the way Muncie says that they have no problems with this setup but when you get the kit it comes with 2 belts, I wonder if it is because they are nice people or for $700.00 for the install kit which is a couple of small metal brackets and a belt they thought they were making too much money.If after all this and you want to install a Muncie pump call first and I can get you the measurements off my brackets and tell you the size of belt and save you about $650.00
Now all that being said the system works great,very fast up at low rpms, never use the high idle switch.If I was to do it again I would check with someone who has another (non Muncie ) setup and see how it works.At this time I would buy another if there was no other but I have I think most of the bugs out.You asked and you recieved Bill, this is the short version trust me.Want the long version call on 5 cents a minute
Have a good day buddy