what would be the highest redline you guys would recommend on a stock 4.8? i tried searching the forum, but couldnt really find an answer. i was thinking 6000, maybe 6100 or even 6200

 

I spun mine to 6k with the stock valve springs. I now turn it to 6500 with no problems. The lifters typically float at around 6800 from what I have read. Maybe a little less with stock springs.

 

so 6k is as high as i should go?

 

If the motor is stock .. I'd put your shift points at 5800 1-2 and 5700 for the 2-3.

If you've done some other things stock, the bottom end will hold 7000 rpm shifts.

 

6100 with my 5.3 when it was stock. it liked the upper rpms...

 

I use to shift out about 6100-6200 before the supercharger stock 5.3L and it ran the best there I backed it down to about 5800-5900 and slowed down a tenth in the 1/8th. These motors luv high rpm's.. Now with the Prochagrer stock 5.3L I'm still shifting at 6000 I don't want to go over that with blower cause she is screamin there.

 

i've got a 03 ecsb 4.8 and I've noticed that it wants to get out of first gear pretty quick, i used to have 1-2 at 5900 now I have it at 5700, and then 2-3 5900, thats the best combo i've found so far, I've never went beyond the 5900 though

 

I have my rev limiter set to 6200 on my 4.8, and WOT shifts at 5600. I got a Wait 4 Me tune, and Jesse thought those limits on my stock engine were conservative for this motor.

 

I had it set at 5800 rpm wot with my handheld. Just ordered my tune from Jesse told him the same or what he felt was better with the tune i wanted (all Performance) .
Do you think higher is better ( stock internals ) on these truck. I find out what its set on .Just hate the wait