jarednut4ever

iTrader: (13)

I have a 2003 gmc sierra Reg Cab 5.3 3.73 posi. Bolt ons. I have a comp cam 204-218 551 551 112lsa. I was just wondering what the best shift point would be. I Shift at 6400 right now. Please let me know what you think. Thanks, Jared

robt342003

iTrader: (1)

6400 sounds bout right, im running the low lift 212/218 and i shift at 6400 1-2, and 6300 2-3

I'm sure even running it up to 6700 wouldn't hurt, lots of guys spinning the 5.3 in this area with no problems.

iamkeniff

iTrader: (16)

set it at 6500 and see if the truck falls off, then adjust as you see it. my 5.3 with a 220/224 .585.588 113+4 stops pulling at 6300 on all the shifts. the truck actually needs gears to make it worth driving.

skeet

iTrader: (18)

a dyno would give more acurate shift points

jarednut4ever

iTrader: (13)

Ya I know, I am just looking for a starting point. This is my first 5.3. I have had ls1's and 6.0's but no modded 5.3's. It is still pulling good at 6400 so maybe I will try a little higher.