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03chevyguy 08-21-2018 07:03 PM
Need help
 
Was up guys so I needed some help or suggestions. Thanks ahead of time. I have a 2003 Chevy Silverado 1500 single cab its a v8 4.8. My question is what mods can I do too it to make it faster or for it to respond quicker it’s all stock at the moment I got it with 135,000 miles it runs nice not like my 5.3 Yukon but yea thanks guys I’m in south Cali.

FFDP 08-21-2018 08:42 PM
What's your budget?

Being from CA may limit your options if you want to stay CARB legal and emissions legal. Do some reading on what you can do, your options are pretty much endless.

Internal stuff would be a camshaft upgrade and the supporting parts. A custom tune along with that. You could do a supercharger kit from a vendor. You could swap gear ratios to make it get up and go quicker. The more power you add the more you'll be concerned with the weak 4L60e transmission.

1slow99 08-21-2018 11:38 PM
Start with 4.10 gears a stall converter, long tube headers and a good tune. From then decide if you rather swap a 6.0 or put money in your 4.8.(cam,ported heads,etc).

03chevyguy 08-22-2018 08:19 PM
Thanks bro
 
Originally Posted by 1slow99 (Post 5446062)
Start with 4.10 gears a stall converter, long tube headers and a good tune. From then decide if you rather swap a 6.0 or put money in your 4.8.(cam,ported heads,etc).
thanks that’s some good info I think I’m going to start that way we’ll my goal is a 6.0 but that’s like later on down the road. I want to make the best of what I have now and enjoy it because I have seen some fast!!! 4.8s thanks for the info bro im going to start with the gears so you think 4.10 gears would be good? Reason being just want to get Info that’s all thanks.

1slow99 08-23-2018 07:14 AM
Originally Posted by 03chevyguy (Post 5446138)


thanks that’s some good info I think I’m going to start that way we’ll my goal is a 6.0 but that’s like later on down the road. I want to make the best of what I have now and enjoy it because I have seen some fast!!! 4.8s thanks for the info bro im going to start with the gears so you think 4.10 gears would be good? Reason being just want to get Info that’s all thanks.
yes it’s one of the best mods I’ve done for my 4.8. I run 20 inch rims(29 3/4 tall tire) and I’m at about 2500 rpm at 70 mph. The taller the wheel the more gear you want to do. So yea gears a 3200-3600 stall, free flowing exhaust (headers, cai) and a tune will get the 4.8 moving pretty good. Plus those mods will transfer over to the 6.0.

03chevyguy 08-23-2018 07:14 PM
Originally Posted by 1slow99 (Post 5446164)


yes it’s one of the best mods I’ve done for my 4.8. I run 20 inch rims(29 3/4 tall tire) and I’m at about 2500 rpm at 70 mph. The taller the wheel the more gear you want to do. So yea gears a 3200-3600 stall, free flowing exhaust (headers, cai) and a tune will get the 4.8 moving pretty good. Plus those mods will transfer over to the 6.0.
yea I have some 20” on my truck there the Tahoe Ltz ones off a 2010 something like that. They look good on the truck I plan on keeping it like that for a while. I just put a air intake today it was giving to me for free so I took it it’s a spectre with an oversized filter not sure if it’s good like the k&n but hey can’t beat free.


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