Quote:
Originally Posted by doubeys_nova
If i ever get around to changing to 4.10 gears it might feel a little more sluggish but still with 4.10 gear sets it shouldnt take much engine to pull the truck around.
With the 4.88 gear sets I have had it loaded heavy and pulled car trailers with cars on them with ease.
Empty, the truck gets it. If you compare the power on a stock truck 4.8L to even a stock truck 454 of the 80's the 4.8 is going to kill it. the engine management on these newer engines is by far superior to old carb/distributor set ups. These little guys sit around the 300 mark hp and lb/ft with a tuned power curve.
When using the 4.8L, adapt a gear set the will put you at a little higher rpm than if you run a 5.3/6.0. i would run 3.73's in 33 and down tire size and 4.10 in 35 and up tire sizes but i have overdrive too. 35's without overdrive either mean really high highway rpm's or a toasted transmission. i had a TH350/3.08 gear set combo initially with my 35's and that trans lasted a whole 6 months/10k miles before all forward gears were gone. i switched to 4.88's and a K case 700R4 and drove it for over a year(and i dont baby it) with out a slip or bad shift still.
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Thing is, I am about to buy a 01 4x4 150k mile ext cab silverado. Come to find out it has a 4.8 instead of 5.3 like advertised. I checked vin, owner took a while to convince. Anyways I am getting the whole truck minus doors, front & rear seats, bed, front fenders, and hood for $900.
My current set up is a 1987 v1500 4x4 long bed single cab w/ 3.42s 32" tire 350 tbi/700r4 241 tcase(out of 91 k5 blazer), instrument cluster out of 91 as well. My tbi has less than 10k but I can't get it to run like I want with the flat top pistons bored .030 over w/ vortec roller cam. So I am tired of dumping $ into it and I want to go ls.
I have heard I can swap the 3.73 locker rear out of the 01 silverado onto my truck though. I was just thinking of staying with 3.42s b/c I will never lift over 4" or go up as far as 35" tires. Back in the day with stock engine and 3.08s I ran 36s for a long time with no real issues. But thats when that truck had all the bottom end torque of the stock cams powerband, with the vortec cams powerband being 1500-4800 my bottom end is barely there now.