No 2.5" pulleys available on a fast check, but I sourced a 2.6" pulley and installed it today:

Drove it a few miles and saw 4-6 psi boost pressure... never needed or had an opportunity to want more...... this truck is now OFFICIALLY and CERTIFIABLY QUICK!!!! <img src="/forums/images/graemlins/scared.gif" alt="" /><img src="/forums/images/graemlins/kewl.gif" alt="" /> Great Googamooga!!! <img src="/forums/images/graemlins/scared.gif" alt="" /> <img src="/forums/images/graemlins/scared.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />

I haven't had a chance to get it on the highway and wind out any gear - probably haven't turned more than 4000 rpms in any gear yet - but I don't know why anyone would need any more power in this truck.... it seems like a'plenty.... but.... I'll probably try a smaller pulley after the bugs are ironed out.... guess I'm now a converted boosthead. <img src="/forums/images/graemlins/lol.gif" alt="" />

There's a lean flat spot on hard acceleration - then it goes stoichiometric - then it goes rich (as it should).... need to play with the regulator and find out what satisfies the transition through boost... more pressure - more/less zero boost fuel pressure rise - and/or more/less rate-of-pressure gain.

The transmission is still not right and before I do anything else, I need to get some gauges on it.... tried loosening the cable, but it still shifts too smoothly and is slipping a little (I think).

The serpentine belt side load is too much for the old stock tensioner/idler pulleys. The adjuster pulley side load is high and wear in the OE pulley allows a wobble - which causes the belt to ride out toward the nose of the idler - which then causes the belt to ride up on the lip of the fan pulley - eventually shredding the belt. For now, I have it under control, but need to use better pulleys. I found these MOTOBLUE GenX pulleys with double bearings (replaceable bearings):

They should have enough front-to-rear bore length to stop the wobbles, but I'll have to rework the tensioner bracket assembly to provide the needed stud/bolt length and diameter.

I'm not there yet, but getting closer. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Frank