Low end sucks!!!!

I have a 4,8 nd my low end just blows. First off all, its not a posi (Get it a Z71 w/ no posi?!?!?) Ok so i was off roading by myself.(4HI) Then half way up a steep hill the stupid truck just crawls to to a stop. It just stays there it humms. It doesnt move at all!!! I shift to 4LO and the tires just spin, is this normal? I already have a tune, feels a little better but it really screams at mid to top end. How can i get a little more push at Low RPM. and what gears do you guys recommend for an daily driver? Has 3.73 from factory in august ill be adding LT headers and CAI oh and a Auburn Posi system.

If you dont mind sacrificing mileage for power, 4.10's with a lets say 2800 stall and you should be good.

what size tires do you have?

Get a higher stall for sure best bang for your buck (circle D stall under 400$)and a rear locker would be good. If you daily drive it the 3.73's are a happy medium although 4.10's would give you most kick down low.

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Originally Posted by lechez71

what size tires do you have?

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33's

soon to be 35's or 37's when lift kit is added

How big a hill?

I had 35's on a 4.8 with stock 3.42's and never had an issue. But never got too crusty with it.

Please don't do 37's. Even 35's are a bit too big for a 6'' lift and rub (6+3 BL looks bewbs). Stay with the 33. Go 4.56. It will be a good gear if you do 35's eventually as well. Bigger stall will help a ton as well.

Hit up Ron for gears. He is a dealer on here and has awesome deals, great service, and awesome turn around time.

dont messs around put 4.56s in there with a 3200+stall

Go for a truetrac rather than the Auburn, too. Clutches will be toast in no time with those gears and big tires. No clutches to burn out in the TT.

and back to the original post - your low-end sucks because you have a 4.8 with tires bigger than 28"

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Originally Posted by Prank111

33's

soon to be 35's or 37's when lift kit is added

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if going 35" tires do 4.56s or 33" tire 4.30s. oh and since your 4wd you also have to do the front diff also.

Hes complaining about his low end, but yet he wants to lift it and put bigger tires on it.

If you are going with 35" tires, call Ron at ronsmachiningservice.com and tell him you want 4.56s and tru trac. Gotta change the front gears too of course. And then call chris at circle d and he will probably recommend a 2800-3000 stall. You should be happy with that

I wasnt aware z71s came with a 4.8 that things gotta be gutless :lol: just get you a stall

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Originally Posted by LamboDoNoMo

I wasnt aware z71s came with a 4.8 that things gotta be gutless :lol: just get you a stall

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In the NNBS it's almost impossible to find. I wasn't aware either.

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Originally Posted by 6.0vortecchevy

Hes complaining about his low end, but yet he wants to lift it and put bigger tires on it.

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Ditto, guy doesnt know what he wants. List of things you can do:
Bigger engine
smaller tires
gears
bigger engine
smaller tires
supercharger
bigger engine
smaller tires
camshaft(requires matching torque converter)

Edit: Or all of the above

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Originally Posted by LamboDoNoMo

I wasnt aware z71s came with a 4.8 that things gotta be gutless :lol: just get you a stall

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Originally Posted by pl4yboy

In the NNBS it's almost impossible to find. I wasn't aware either.

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Some Z71's also came with 3.42 and even 3.23 axle gears.

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Originally Posted by cjriojas

Some Z71's also came with 3.42 and even 3.23 axle gears.

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My new Z71 has the 3.42s, but it also has the 6l80e. The 3.73s in with this trans are similar to getting 4.10s stock with a 4l60e

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Originally Posted by pl4yboy

...The 3.73s in with this trans are similar to getting 4.10s stock with a 4l60e

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so is a 3.73 with a 5 speed :D

So much win in this thread !! Throttle response sucks because you have a 4.8 in a heavy 4x4 .. Gears will help a Ton!!! I stall 4.56 in anything more then 32" tires .. Any less 4.10s .. You need to find you a 800.00 6.0l to drop in would be a quick and easy fix since a complete gear and locker swap will cost you 2000 range .. It will take a really good tune .. No cats and intake system to make any power with that 4.8 and you will still have nothing compared to a 6.0l .. If you play on the rocks or mudd or anything offroad I don't tell people to add stalls ... It makes a bad problem worse !! And it will kill a trans in a hurry ... Gears and lockers first .. Or more power .. Then focus on the trans combo and possibly a stall but I wouldn't want to sell you something you don't need or will be really un happy with .. Get at least 4.56 gears and lockers first

Yea. Uhh daily driver!!!

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Originally Posted by Prank111

Yea. Uhh daily driver!!!

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What is that supposed to mean?

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Originally Posted by Prank111

Yea. Uhh daily driver!!!

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if you're doing big tires, gearing down your diffs will make it better as a DD because it'll be getting you closer to the stock final drive ratio, which is where that 4.8 will enjoy its life much better. it'll also save you a bit of gas around town.

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Originally Posted by pl4yboy

What is that supposed to mean?

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YEa i originally post this up to help me out with my daily driver, all yall do is rag on the 4.8 and are suggesting to make a mean rock crawler, drag strip beast.

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Originally Posted by Prank111

YEa i originally post this up to help me out with my daily driver, all yall do is rag on the 4.8 and are suggesting to make a mean rock crawler, drag strip beast.

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Cus the 4.8 with a 4x4 is weak as it is then you add the tires and crap with it and then its really weak, and so what if its a dd most the trucks on here are DDs

Put a tornado in and a Fitch fuel catalyst. You'll get plenty of low end power due to the Tornado's tornado-ing effect acting much like a supercharger.

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Originally Posted by Prank111

YEa i originally post this up to help me out with my daily driver, all yall do is rag on the 4.8 and are suggesting to make a mean rock crawler, drag strip beast.

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Because we know what we're talking about. You aren't going to get what you want out of a 4.8 in a 4x4. The end.

I like how anything with gears or higher stall is automatically a rock crawler and drag strip beast. It's called "every action has an equal or opposite reaction". Automotive 101. Taller tires will make the vehicle act as though it has a higher (numerically lower) gear ratio in it. To correct this, one must install lower (numerically higher) gears. Or live with it. The 4.8 is a high revving motor, why that design was built for a truck is beyond me, but that's not the point. The sooner you get it into it's powerband the better, or yes it will feel like a dog. Again, gears and a higher stalling torque converter.

or smaller tires

ok, then another crappy GM design, screw that! a high revving engine, and a heavy body.... How much can i get for my truck? ECSB, 143K 4.8 two tone, Z71 pkg. AR 20" rims mud terrains. Or would it be better selling off at an public auction?

GM, Ford, Jeep, Dodge, etc..... Don't matter what it is, bigger tires need GEARS.

20's aren't helping either.

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Originally Posted by Prank111

ok, then another crappy GM design, screw that! a high revving engine, and a heavy body.... How much can i get for my truck? ECSB, 143K 4.8 two tone, Z71 pkg. AR 20" rims mud terrains. Or would it be better selling off at an public auction?

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I'll give you 500 bucks.

shoot... i'd give him $1000 if i had a way to get it to FL

I'd give him 1500$ if I didn't have to pay for gas to drive it back to my house.

Ha! Ill keep it then. ill be on the lookout for a newer one.

it'll be cheaper to just swap a 6.0 or stall/gears

I will give him $1501 and pick it up.

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Originally Posted by zebra

it'll be cheaper to just swap a 6.0 or stall/gears

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k so what about MPG? down to whaat?

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Originally Posted by Prank111

k so what about MPG? down to whaat?

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Down to the same. Hell, it could even get better since your 4.8 revs up more often to get your tank moving.

And everyone quit telling him to get a high stall torque converter. He wants an offroad/onroad truck. Like casey said, anything higher than a 2800 stall tc will hinder performance.

Just put nawz on it.

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Originally Posted by cjriojas

Down to the same. Hell, it could even get better since your 4.8 revs up more often to get your tank moving...

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my in-town mileage went from 14 to 16 when i swapped from the 4.3 to the 5.3 and only went down by 1 on the interstate.

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Originally Posted by cjriojas

...And everyone quit telling him to get a high stall torque converter. He wants an offroad/onroad truck. Like casey said, anything higher than a 2800 stall tc will hinder performance.

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sorry... i'm still learning about auto stuff. i drive a man's transmission