yeah, the truck ran well for a while. I brought it down from TN and it could easily keep 80 in 5th (even go faster if I wanted). I came down to where I live in TX (4,500ft elevation) and I realized that the gears were toast. While I waited for the gears to get here, I had to stick a 3rd with 4.10's in it for a while. It had very poor power (naturally going from 5.29 to 4.10), I messed with the timing just a little...put the 5.29's back in it and it ran like poo. I have since re-timed the truck using a jumper, but that does not seem to help much. If I drop the idle down to 700-850 it feels like the truck is going to fall apart (because the engine is idling so rough...and it makes it to where I can REALLY here the lope of the cam). I will probably drop the idle down to 800 and time it tomorrow (and then bring it back to about 1000 just so it runs smooth).
No check engine light, and I haven't pulled and codes yet...I will have to save a little cash to do that since the only guy in this town that has a reader that will hook up to the truck charges an arm and a leg to do any work.
The truck (I found yesterday) can keep 70..sometimes 75...but only if I push it real hard. If I get on the gas more than an inch or so it really bogs down and seems to almost lose speed.