few questions about a higher milage 4.8

Gears would be nice, I like my 3.73 but it was factory like that. No need for a tune until you do a cam swap or something. Not worth the money with simple bolt on's. You can get a mail order tune or a handheld which really isn't going to benefit much really. I'd hold off on a tune until I changed something internally. A good dynotune will cost you 4 to 600 depending on who you know and where you can get it done. To me though a tune at this point is throwing money away you could have spent on a cam. You don't want to pay for a tune twice.. It's not like a deisel where you can pickup 60 to 100 hp. When I was at the dynomax dyno challenge this guy had a s10 extreme dyno'd went into summit bought a hypertech and re-dyno'd only a 9 hp gain for almost $400. If you really plan on a cam wait for the tune. Instead do the cam and gears at the same time, then tune.

i got a set of yukons from rons shop (one of the sites sponsors) GREAT price, and haven't had any problems with them.


Depending on tires you MAY lose 1-2 mpg on highway, but you could also gain it. I have 36's and actually picked up like 2mpg in city and 1mpg on highway going from 3.73 to 4.56. Buddys camaro lost like 2mpg highway going from 3.23 to 3.73. Hard to tell.

looks like im gettin gears for sure lol

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Originally Posted by ThumpinZ

Gears would be nice, I like my 3.73 but it was factory like that. No need for a tune until you do a cam swap or something. Not worth the money with simple bolt on's. You can get a mail order tune or a handheld which really isn't going to benefit much really. I'd hold off on a tune until I changed something internally. A good dynotune will cost you 4 to 600 depending on who you know and where you can get it done. To me though a tune at this point is throwing money away you could have spent on a cam. You don't want to pay for a tune twice.. It's not like a deisel where you can pickup 60 to 100 hp. When I was at the dynomax dyno challenge this guy had a s10 extreme dyno'd went into summit bought a hypertech and re-dyno'd only a 9 hp gain for almost $400. If you really plan on a cam wait for the tune. Instead do the cam and gears at the same time, then tune.

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That may be the dumbest thing I've ever heard.. To be honest a tune should be the FIRST thing done. Especially by a reputable tuner. With a mail order some tuners offer free retunes...like Nelson Performance. And not to mention when swapping gears you MUST tune for the different gears.

Besides if you go back and read his original post it says he has a black bear 89 tune already.

I have to say I agree^ my tune made the most differance in the truck. and with gears my shift points and speedo would be off and if i do headers and ory i would need a/f ajusted and rear o2s turn off.

Exactly. I say up to the 93 tune first, then do LT's/ORY.

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Originally Posted by bangbangskeetskeet

Exactly. I say up to the 93 tune first, then do LT's/ORY.

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Wouldn't I want to do it the other way around? So I'm thinking e-fans, LT's/ORY and a 93 tune and will I notice a difference in the tune going from 89 to 93? I know everyone is going to tell me something different I'm just gathering ideas so I can be most efficient with my funds.

how much are retunes with bb? My trucks a 2000 silvy with 179k and only thing replaced has been the rear... i wish i'd know about this site before I spent $800 for a g80 3.73 rear end

May sure to do some tranny mods. I'm on my 3rd one Lol. I finally got smart and had one built.

Well, realize that if you do these mods individually, you're going to need a retune after each mod. If you can afford to have a little downtime, the best thing to do would be to have your tuner tune for all the mods and install them at the same time. The E-fans and gears require a retune. The LT's can go without a tune but really won't shine without one. I used to live in Wabash, IN. I can't recall you having access to 93 octane. 91 will do just fine. But yes, it will be a difference.