Jump to content

I Want New Gears I Think

beav626

Recommended Posts

beav626 Enthusiast

beav626

Posted
Posted

My 01 with the 4.8L feels like a wimp cruising on the highway with 22" Rims. I struggle going up any kind of hill. Now that summer is here and I will be towing my boat, I'm afraid I wont have the power I need to pull my boat up a hill.

 

I have the 3.15 diff and was considering going to a 3.73

 

 

Who has done this and what you recommend. Should I just change out the gears or swap the pumpkin? I am trying to be as cost effective as possible. would engine mods be a better choice?

Matt_ Senior Enthusiast

Matt_

Posted
Posted

You should consider going with 4.10s, especially if you're towing with the 4.8L.

 

I'm assuming you've never done gears by the questions you have asked... are you planning on having someone help you? Is your truck 2WD?

 

If you find a rear with 3.73s or 4.10s in it, you can change it out in an hour or two and just need to reprogram the computer. If you're just going to buy a ring&pinion and a master install kit, you're going to want a professional to install them for you. They're not incredibly "hard" to do, if you know what you're doing and have the right tools...

beav626 Enthusiast

beav626

Posted
  • Author
Posted
You should consider going with 4.10s, especially if you're towing with the 4.8L.

 

I'm assuming you've never done gears by the questions you have asked... are you planning on having someone help you? Is your truck 2WD?

 

If you find a rear with 3.73s or 4.10s in it, you can change it out in an hour or two and just need to reprogram the computer. If you're just going to buy a ring&pinion and a master install kit, you're going to want a professional to install them for you. They're not incredibly "hard" to do, if you know what you're doing and have the right tools...

 

I made a mistake-I have code GU6 3.42 Rear... it is a 2WD truck.

I have never done gears but have friends that have swapped out pumpkins.

 

Will a 4.10 be enough of a gear change to pull my truck w/ 22"s and a 2500 pound boat without any issues?

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
You should consider going with 4.10s, especially if you're towing with the 4.8L.

 

I'm assuming you've never done gears by the questions you have asked... are you planning on having someone help you? Is your truck 2WD?

 

If you find a rear with 3.73s or 4.10s in it, you can change it out in an hour or two and just need to reprogram the computer. If you're just going to buy a ring&pinion and a master install kit, you're going to want a professional to install them for you. They're not incredibly "hard" to do, if you know what you're doing and have the right tools...

 

I made a mistake-I have code GU6 3.42 Rear... it is a 2WD truck.

I have never done gears but have friends that have swapped out pumpkins.

 

Will a 4.10 be enough of a gear change to pull my truck w/ 22"s and a 2500 pound boat without any issues?

 

 

 

yep, that should put the engine in the power band range for towing. What did the truck originally come with in regards to OEM rims?

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
the 16" Aluminum rims

 

 

Hmmm, those 22"s may weigh 15-25 Lbs more than those stock 16" aluminums. Even though, with the swap to 4.10s would help out with towing but it will hurt your top end (Engine speed as well as top speed) a little.

beav626 Enthusiast

beav626

Posted
  • Author
Posted
the 16" Aluminum rims

 

 

Hmmm, those 22"s may weigh 15-25 Lbs more than those stock 16" aluminums. Even though, with the swap to 4.10s would help out with towing but it will hurt your top end (Engine speed as well as top speed) a little.

 

 

 

I was considering getting some 20"s but didn't think the weight savings would be worth it.

 

Would 20's weigh that much less than 22's

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
the 16" Aluminum rims

 

 

Hmmm, those 22"s may weigh 15-25 Lbs more than those stock 16" aluminums. Even though, with the swap to 4.10s would help out with towing but it will hurt your top end (Engine speed as well as top speed) a little.

 

 

 

I was considering getting some 20"s but didn't think the weight savings would be worth it.

 

Would 20's weigh that much less than 22's

 

 

 

Not much per Rim, and certainly not worth the difference in cost (unless you recoup it by selling the 22"s). Perhaps with the money instead, you could add some performance mods but with your current setup, I would regear the pumpkin out back and then have the PCM retuned to change that value as well as perhaps tuning the rest of the truck (if you dont already have a tune).

Matt_ Senior Enthusiast

Matt_

Posted
Posted

Yeah i would definitely get those 4.10s in there, you'll probably be good with your current wheels/tires and towing a 2500lb boat

 

The 3.42's with the 4 speed trans coupled with the 4.8L is just not meant for hauling anything (as you've found out)... put those 4.10s in there to get the 4.8 into the powerband, and with the proper tune it'll be a whole different truck

Matt_ Senior Enthusiast

Matt_

Posted
Posted
so what is the best and least expensive way to get a set of 4.10 gears on my truck.

 

 

i'd call around for some install prices and go from there. You could try finding axles from a junk yard but then you have to worry about rebuilding it if there's water sitting in the case.

 

Since you only need to gear one axle, it'll probably be between $500-$700 (though this varies A LOT by location)

Bowler807 Enthusiast

Bowler807

Posted
Posted

More than the weight of the wheels, the diameter of the tires will affect the gearing more. You can have your 22 inch wheels and if the tire diameter is the same as stock you will notice little difference in performance. If however your tire diameter is larger, now the tire has to travel farther per revolution thus reducing the gearing. For example if your stock tires were 32 inches in diameter with 3.42 gears in 3rd gear without lock-up at 65 mph your RPM's would be roughly 2334. With everything else the same just changing the tire diameter to 35 inches your RPM's at 65 mph would be 2134. This is almost a 9% difference in RPM's. To get back to the stock RPM with the 35 inch tires 3.73 gears would need to be installed.

 

Check out this site. It has a matrix of tire size vs gear ratio. http://www.4lo.com/calc/geartable.htm

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
More than the weight of the wheels, the diameter of the tires will affect the gearing more. You can have your 22 inch wheels and if the tire diameter is the same as stock you will notice little difference in performance. If however your tire diameter is larger, now the tire has to travel farther per revolution thus reducing the gearing. For example if your stock tires were 32 inches in diameter with 3.42 gears in 3rd gear without lock-up at 65 mph your RPM's would be roughly 2334. With everything else the same just changing the tire diameter to 35 inches your RPM's at 65 mph would be 2134. This is almost a 9% difference in RPM's. To get back to the stock RPM with the 35 inch tires 3.73 gears would need to be installed.

 

Check out this site. It has a matrix of tire size vs gear ratio. http://www.4lo.com/calc/geartable.htm

 

 

thats the website I was looking for. I have a crew cab with the 4.8 and 3.23s out back and I have recently started to haul/tow more crap in the bed. I have this dilemma as well.

beav626 Enthusiast

beav626

Posted
  • Author
Posted
More than the weight of the wheels, the diameter of the tires will affect the gearing more. You can have your 22 inch wheels and if the tire diameter is the same as stock you will notice little difference in performance. If however your tire diameter is larger, now the tire has to travel farther per revolution thus reducing the gearing. For example if your stock tires were 32 inches in diameter with 3.42 gears in 3rd gear without lock-up at 65 mph your RPM's would be roughly 2334. With everything else the same just changing the tire diameter to 35 inches your RPM's at 65 mph would be 2134. This is almost a 9% difference in RPM's. To get back to the stock RPM with the 35 inch tires 3.73 gears would need to be installed.

 

Check out this site. It has a matrix of tire size vs gear ratio. http://www.4lo.com/calc/geartable.htm

 

 

thats the website I was looking for. I have a crew cab with the 4.8 and 3.23s out back and I have recently started to haul/tow more crap in the bed. I have this dilemma as well.

 

 

 

A friend of mine told me his shop will do it for $450 installed.

 

I think I will do it.

 

Now I need to find a tune.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,677
    Total Members
    8,960
    Most Online
    RobbertClaus
    Newest Member
    RobbertClaus
    Joined

  • Who's Online   5 Members, 0 Anonymous, 508 Guests (See full list)

  • Latest Articles

  • Posts

    • KARNUT
      Oil Consumption

      By KARNUT · Posted

      No I didn’t watch a video of a person who analyzes oil for a living explain general oil usage. For clarity I did ask my brothers one who runs our equipment business. The other who runs our old ROW business about oil usage. Nothing has changed since I retired. Their personal vehicles or work vehicles use no oil. Not enough to see on the oil checking device. Then I pondered. I like to ponder. In this extended oil changing world with oil change countdowns or lights. If engines used say a qt every 2500 miles or up to even 4000 miles. With oil changes reaching as high as 15000 miles. Normal for most people is eight to ten. Vehicles should potentially be seizing up all over the place. Especially in hilly terrain. Just how many people actually check their oil? Maybe 10 percent. Those are the people that probably change their oil early. I like to research used car listings. I have five favorite dealers I check. They all list carfax with their listing. It’s rare to see vehicles with anything but extended oil changes. Transmission service, forget about it. I’ve seen Honda and Toyota certified vehicles up to 100K miles and ten years old. With nothing but normal maintenance. Isn’t nice we all have different experiences and believe our way is the best. You certainly get backup for whatever you believe. Life would be boring otherwise.
    • RobbertClaus
      RUMOR / INSIDER: 2027 Silverado Dealer Reveal NEXT WEEK

      By RobbertClaus · Posted

      Interesting rumor. Dealers near me have been tight-lipped so far, but if this reveal actually happens next week, I'm really hoping they finally give the HD a proper interior overhaul. The competition has been eating their lunch in the cabin department for a while now.
    • Chuck FB
      Oil Consumption

      By Chuck FB · Posted

      There are a few good takeaways in that video that pertain to this thread, certainly the possibility of the oil control rings having buildup, the fuel injectors and how clean or not that they are ending up affecting the pistons rings carbon buildup, and the fact that its normal up to a point for a given engine to use some oil, and that the oil quality that is being utilized is part of that ring clogging up issue as well.   I was talking with a neighbor yesterday who has a baby LZ0 duramax and he had bought it slightly used but it does consume some oil and he has switched over to 5W-30 Euro spec oil and in this case that never made a difference in consumption over the factory 0W-20 recommendation. He finds it uses a quart in about 3500 miles and as he goes a ways over that distance he adds oil to full and goes another 1000 miles or so and then changes oil and is typically at 40% or so left on the oil monitor at that point with his use case of quite a lot of highway miles and more limited in short run use. I don't know what other LZ0 engines are doing for oil consumption but that is what his is doing. 
    • riddler
      Oil Consumption

      By riddler · Posted

      I dont care what Lake says. Goodnight. 
    • Atlas
      Oil Consumption

      By Atlas · Posted

      Ok well I guess Lake disagrees with me on a few points. I call oil consumption pretty basic. Rudimentary. He calls it "really complicated." I think 1qt consumed in 3k miles is a lot. He says that's normal. In 22 minutes, he'll use his natural talent to explain oil consumption to anyone watching this video. He covers everything from obvious engine damage to how normally functioning healthy engines consume oil by design. Lake explicitly states how you drive will impact oil consumption.   Shut up and watch:    

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...