I'm sure this topic has been discussed again and again. I tried a search but I couldn't find what I was looking for? I have a 99 Silverado 5.3 with 3.73 gears. What is the best shift points from experience? I'm currently shifting at +3,+6. That's about 5600rmp+/-. I was told that stock shifts at 5200rpm+/-. My seat of the pants meter didn't feel like the truck was pulling at the higher rpms. Maybe I was mistaken. Any help and advice would be great. Thanks guys. <img border="0" alt="[Truck]" title="" src="graemlins/gr_truck.gif" />

 

I just got my HPPIII and went to the track last night. I have a 4.8L SCSB with 3.42's, and I set the rev limiter @ 6200, ***** at +5 and +12. I got my best times with this setup, BUT...

I have heard from several people that there may be an issue with pushrod life at this rpm. I ran my best mph with those settings (70.08 in the 1/8)and spun with a high 2.3 (like 2.37 or 2.38) 60'.

I didn't see a great increase in the 1/8 by bumping up the shift points, so I think that I'm going to set mine back to 6000, +4 +11.

L8R,
Scream <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

 

I don't push mine past 6100 rpm's when using the HPP. With 3.73's, the max I can go is +4 from 1-2 (6112 rpms), 2-3 +12 (6012). I have it set for +3 (5986) 1-2 and do have it at +12 for 2-3, putting 1-2 at +4 didn't produce better times so I figured why push the engine.
Jim

 

Can snyone confirm that the stock shift points for the 99 truck are around 5200rpm? Y2K...does your truck still pull at 6grand on the tach?

 

I'm shifting @about 6k with 4.10/1 but the help
is [I think] because I'm cathing 2nd & 3rd 500 rpm
higher so it's not as flat after the shift.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Can snyone confirm that the stock shift points for the 99 truck are around 5200rpm? Y2K...does your truck still pull at 6grand on the tach?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yep, my tach goes to 6K when shifting. From what I've read, 99 trucks shifted from all gears at 5200 rpm's. 00+ trucks shift from 1-2 at 5600, then 5200 for all the rest, they put a different cam in the 00+ trucks. Yours being a 99, it might not like being reved to 6K because of the cam. If stock is 5200, then 5600 may be your max!?
Jim