I used the microwave, just kidding. Threaded rod works perfectly. Run 2 nuts on the threaded rod and it works like an adjustable length bolt.

I cant really say for gains. Its 105 degrees out here and the engine is running a like dog. It revs up quicker though. Especially in 1st gear. hopefully mileage will improve a lil bit.

 

Just use a longer bolt, works just fine. I had 2 bolts that were the next 2 sizes up in length.

 

i always stayed away from ud pulleys cause i remember hearing about over heating or just running higher temps, especially in az. hows it running with it on now?

 

It runs great. I used to never run the AC, with the underdrive pulley the AC dont drag the motor so much. Now Ive been running it all the time. No problems with overheating or draining the battery. They should have put them on from the factory.

 

I would have bought a longer bolt if anyone locally had them in stock.