I drive an 03 chevy single cab, step side, charcoal grey.

 

What times were you hitting on friday?

 

I owuld check your pinion angle since your truck is dropped.

 

Hmm, now where have I heard that before?

 

Oops didnt read through the whoel thread what NakedAV said

guess ill start reading the whole thread

 

I made three passes only a 14.2 first pass, second pass 14.0, and third was a 14.1, there was a good turn out, good luck getting ur sit straight, ur really gonna drop into the 13's with a good cam.

 

I had a couple out[ut shafts break on 2 4l60e transmissions in my truck, it eneded up being worn 4.10 gears sending a vibe up the driveshaft above 75 mph.

 

This is what an imperfect pinion angle together with GM's superb OEM driveshaft balancing do on a dyno:

 

I swapped my whole rear end off a 2005, so I don't think they are worn out.
What I did see was the rear part of the tranny where the pinion goes is bent;
and I think it was from the first time it blew the original shaft. On the pinion
angle issue, I don't think it's a problem because it's been a while since I have
this drop and hauling *** at the same time. The first time the driveshaft blew it was going over 120 mph so that time it went out of balance; then everything else just happened because I didn't think the rear part of the tranny was damaged ( even though my brother who was installing it told me that he was having trouble getting the driveshaft in when it always slides in perfectly) and went ahead and drove it like that. I should of dropped the trans. and had somebody check it first. But oh well

 

Highly doubtful you can see a pinion angle issue. Even experts can't see them, they have to perform a measurement. If you choose to forego this measurement, you could be asking for another broken driveshaft (see above pic for reference).

I had three places measure my angles and they all did it for free. Took all of like five minutes. You need two measurements: (1) Transmission output shaft angle, and (2) Pinion angle. They should match and be opposite.

Before I fixed my issue, the angles were -4/+7 (transmission shaft down/pinion up). When I corrected the issue with longer lower rear control arms, the angles were -4/+3. Perfect for high power launches, because under torque, the pinion moves a degree to +4.