KSanders43

I have 88 mustang gt with a vac pump delete and small crank pulley size 4.4 im having a hard time finding my belt size because of it and im really trying drive my car again i went to advance auto part over 10 times looking for the right belt and i just can't find it plz!!!!!! Help me !!!!!?!?!

Buck Sergeant

KSanders43, I will tell you the trick we used back in the day. Get a piece of clothesline rope and run it thru your pulley system. This won't be exact, but it will put you in the ballpark. Then bring the sized rope to a parts house, and they will take it from there. Good luck.

wbrockstar

Thats probably gonna be a difficult answer to find in forums, because of you running an underdrive crank pulley but stock water pump & alternator pulleys with a smog delete pulley.The lengths ive found posted were with 3 underdrive pulleys or the stock pulleys in place plus bypassed/deleted smog,ac and/or power steering.If you were running all 3 ud pulleys and bypassing the smog pump vs running a delete pulley in place of the smog pump,an 84.5" belt would be the one you need.
*** the lengths shown in the diagram below were measured with a ud crank,wp & alternator pulley in place,plus bypassing the smog pump.The ud crank pulley is smaller than the stock one but the ud wp & alt pulley are larger than the stock ones,so the belt is probably gonna be shorter than 84.5",if you bypass the smog pump,run stock wp/alt/ps,ac pulleys and a ud crank pulley***
You could also rig the tensioner pulley so its sitting in the position it would be in if a stock belt were in place,then run rope around the pulleys,like Buck suggested,& lay the rope out lengthwise when done, so you can measure it.