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#117701 - 08/21/04 09:24 PM Chevy rear gears.
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
I have an '02 Chevrolet P/U X-Cab, V-6. It seems so slow and little power to pull my full mx trailer. Its struggles on up hill climbs, the tranny drops itself up and down in gears while driving just to pull a trailer.

My question is, I thought about changing out the rear end to a higher gear? I'm not sure what the factory gearing is for my truck but, I need more pulling power!!

What Chevy model truck could I get a rear end out of that has a better gear ratio for me but too high of a ratio?

Thanks for any replies and help on any ideas that may help. I will be out of town next week on business so I will not be able to reply to any pm's. I will read replies next Sat.


Thanks,


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Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

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#117702 - 08/28/04 09:00 PM Re: Chevy rear gears. [Re: WannaRace]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
is a chevy full size 10 bolt rear axle for a p/u a 8 1/2 ring and pinion??
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#117703 - 09/03/04 10:41 PM Re: Chevy rear gears. [Re: WannaRace]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
doe's anyone know what rear gears are in a 3/4 ton Chevy?
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Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

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#117704 - 09/04/04 12:11 AM Re: Chevy rear gears. [Re: WannaRace]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
It depends on what year it is, 2 or 4 wheel drive, what towing package it has, what motor/tranny combo it has. Need alittle more info.

For referance I have a 99 K2500 (old body style 4x4) with the 5.7L (350)/4L80E Auto with the HD towing package and it is a 14 bolt with 4.10's and Limited Slip.

According to the book in my 99

C-1500 (2wd)
5.0L 3.08, 3.42, 3.73
5,7L 3.08, 3.42, 3.73

K-1500 (4wd)
5.0L 3.42, 3.73
5.7L 3.42, 3.73
6.5L Diesel 3.42, 3.73

C-2500 (2wd)
5.7L 3.42, 3.73, 4.10
6.5L Diesel 3.42, 3.73, 4.10
7.4L 3.73, 4.10

K-2500 (4wd)
5.7L 3.73, 4.10
6.5L Diesel 3.73, 4.10
7.4L 3.73, 4.10

C-3500 (2wd)
5.7L 4.10, 4.56
6.5L Diesel 4.10
7.4L 4.10, 4.56

K-3500 (4wd)
5.7L 4.10
6.5L Diesel 4.10
7.4L 4.10, 4.56

C/K-3500 HD Chassis Cab
6.5L Diesel (Std) 4.63
6.5L Diesel (Auto) 5.13
7.4L 4.63, 5.13

So with that said, if it is 4wd then you are looking at 3.73 or 4.10 (for 99 Model) I do not know about the other year models but generally GM did not change alot but I'm not positive.

Hope this helps.
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#117705 - 09/06/04 02:40 PM Re: Chevy rear gears. [Re: mahana79]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
YOU ROCK!!!

Thanks so much!!! I wanted to buy a rear end at a junk yard but needed to what type of Chevy trucks had what so I wouldn't buy something I already have in my truck.

I also heard to check this is to turn one side and there should be a certain rotations to count and see what gear it may have in it?


Thanks again,


_________________________
MSRA/Outlaw

Hannah PW50
Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117706 - 09/06/04 10:35 PM Re: Chevy rear gears. [Re: WannaRace]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
A positive way to get a gear ratio is to actually count the number of teeth on the ring and pinion gears and divide them. (Ring gear teeth)/(Pinion gear teeth)=Gear Ratio

The ole spin the tire method works but you cant tell 4.10's from 4.11's but it goes likt this.

Jack one side up (assuming the axle is still in the vehicle and there are tires on it) I mark the tire at 12 o'clock and then I make a mark across the pinion and the housing. As I spin the tire one complete revolution I watch and count how many times the marks on the pinion meet.

ex. If the marks meet 3 time but not quite 4 then you are probably looking at 3.73's if they meet 4 times plus alittle then count on 4.10's. it helps to check out Randy's Ring and Pinion GM and Randy's Ring and Pinion Dana to check out what ratios are even availabe for the particular axle you are looking at (assuming something GM or Dana)

"The only stupid question is the one that isn't asked"
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#117707 - 09/09/04 07:08 PM Re: Chevy rear gears. [Re: mahana79]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
I can't thank you enough!! I love the web sites. If I can't find a 4x4 rear with a 3.73 gear in it, I will order the gears through them and find someone to install it.

Thanks again so much for your help.

_________________________
MSRA/Outlaw

Hannah PW50
Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117708 - 09/09/04 08:41 PM Re: Chevy rear gears. [Re: WannaRace]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
If you are looking for just the rear I dont think it matter whether it is out of a 2wd or 4wd model.
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Texoma Off-Road
"Just roll with it!!!"


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#117709 - 09/10/04 09:35 PM Re: Chevy rear gears. [Re: mahana79]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
I had another email on a comment that I didn't think of. I need to stay around the same year model because of the computer system with brakes, tranny, etc. and a 3/4 rear in my 1/2 ton, I will have to change other stuff to fit.

I just thought it would be less expensive to find a complete rear end but, if I have to find one around the same year as mine, it will cost alot more.

Now I'm back to square one...

_________________________
MSRA/Outlaw

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Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117710 - 09/14/04 02:13 PM Re: Chevy rear gears. [Re: WannaRace]
4x4Freak Offline
Gang Member

Registered: 06/06/01
Posts: 192
Loc: Kermit, TX
For a 2wd silverado it is most likely going to be 3.08s or 3.42, 4wd will be 3.73 or 4.11. If it's all factory parts you should be able to find out the ratio by the RPO code in the glove box. The rear axle ratio should be a G** or H** number. http://www.wiu.edu/users/muwtj1/rpocodes.htm

You can also pull the diff cover and look for some numbers stamped on edge of the ring gear. There should be 3 sets of numbers; the GM part number, mfg. date and two other numbers. One of them is the number of teeth on the ring gear and the other is the number of pinion gear teeth. Take the bigger number and divide it by the smaller and you will have the gear ratio. (ex. 41/11 would be 3.73)

Are you towing in overdrive?
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#117711 - 09/15/04 01:06 PM Re: Chevy rear gears. [Re: mahana79]
stbohmer Offline
Gang Daddy

Registered: 05/08/02
Posts: 644
If The Rear end Is out of a 4X4 It Will Have 6 Lug Axles , 2Wheel Drive Will Be Five Lug! For The Price Of A Used rear end & the time to install,I Could Build Yours With Gears! IfInterested Call STB Auto 512-292-3519(Steve)We Do Some Wheeling To,Also My Boys Race MX. Thanks


Edited by stbohmer (09/15/04 01:10 PM)

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#117712 - 09/15/04 10:21 PM Re: Chevy rear gears. [Re: stbohmer]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
not completely true. if the 1/2 ton you are talking about is the 02 model then it is 6 lug as well. and not all 3/4 tons are 6 lug. My 99 model has the full floating 14 bolt 8 lug. I do agree though that it would be easier and probably cheaper to put gears in the stock axle. anything that v-6 will hold up to the axle will too.

In reply to:

If The Rear end Is out of a 4X4 It Will Have 6 Lug Axles , 2Wheel Drive Will Be Five Lug! For The Price Of A Used rear end & the time to install,I Could Build Yours With Gears! IfInterested Call STB Auto 512-292-3519(Steve)We Do Some Wheeling To,Also My Boys Race MX. Thanks


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Texoma Off-Road
"Just roll with it!!!"


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#117713 - 09/25/04 07:30 PM Re: Chevy rear gears. [Re: mahana79]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
Great, I do have a towing feature on my gear shifter and I use it until I get up to higher speeds and then take off to OD. It's when I go up and down hills on the freeway I just hate down shifting all the time.

I thought if I took out the 3.08 and installed a 3.42 with my over sized tires it would pull better on hills with out constantly shifting in and out of geras?


Thanks
_________________________
MSRA/Outlaw

Hannah PW50
Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117714 - 09/25/04 07:36 PM Re: Chevy rear gears. [Re: stbohmer]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
I haven't bought the gears yet, because I am doing the reserch on the best route to take or if I am even doing the right thing?

How long will it take to install and what's a ball park cost? I noticed you area code is 512 your out of town and I'm in Houston so, It would have to be on a weekend?
_________________________
MSRA/Outlaw

Hannah PW50
Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117715 - 09/25/04 07:59 PM Re: Chevy rear gears. [Re: WannaRace]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
you would see a good difference in 3.42's or you might even consider 3.73's. we have some gearing calculators on our web site. gearing calc's plug in some numbers and see what you like.
_________________________
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"Just roll with it!!!"


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#117716 - 09/27/04 02:21 PM Re: Chevy rear gears. [Re: mahana79]
Tominator Offline
Poet At Large

Registered: 01/05/01
Posts: 3915
Paul, if you started with 3.08's, and added taller tires, you are running behind, even without the trailer. The 3.42 may bring you back to stock , but you still won't have the guts to really pull your bikes.

I had a 90 Chevy with a 5.7L, 3.42 and 5 speed manual. It worked fine empty, but really lugged when I pulled my 7x12 Wells Cargo with it.

My 98 C3500 had a 5.7 with a 4.10 stock. After adding bigger tires, it made it into something very close to a 3.73. Worked fine for a small trailer, but needed help with a bigger rig. I also did about 75 HP worth of adders to the motor.

My 01 2500HD has the 8.1 and 3.73 gears...no probs at all.

If towing is your main concern, going to the 3.73 gears is probably where you want to be. You'll only sacrifice 1-2 mpg over the 3.42, and that's empty. You'll work the engine and tranny, etc less with the gears, and may actually SAVE fuel while pulling your trailer. Also, Hypertech makes a Power Programmer III for your truck. I'd recommend it for several reasons. First is the added power it provides (and IMPROVES mileage). Second, you can input the gearing changes to correct your computer. Third, you can also input your new tire size, to correct your speedo and odo. Best $350 you can spend on the truck! It only takes about 20 minutes to program the truck, and 10 minutes to go back to stock settings, for service work.

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#117717 - 09/27/04 09:41 PM Re: Chevy rear gears. [Re: Tominator]
mahana79 Offline
Hall of Fame

Registered: 05/31/04
Posts: 1473
Loc: Iowa Park/Wichita Falls TX
In reply to:

Paul, if you started with 3.08's, and added taller tires, you are running behind, even without the trailer. The 3.42 may bring you back to stock , but you still won't have the guts to really pull your bikes.

I had a 90 Chevy with a 5.7L, 3.42 and 5 speed manual. It worked fine empty, but really lugged when I pulled my 7x12 Wells Cargo with it.

My 98 C3500 had a 5.7 with a 4.10 stock. After adding bigger tires, it made it into something very close to a 3.73. Worked fine for a small trailer, but needed help with a bigger rig. I also did about 75 HP worth of adders to the motor.

My 01 2500HD has the 8.1 and 3.73 gears...no probs at all.

If towing is your main concern, going to the 3.73 gears is probably where you want to be. You'll only sacrifice 1-2 mpg over the 3.42, and that's empty. You'll work the engine and tranny, etc less with the gears, and may actually SAVE fuel while pulling your trailer. Also, Hypertech makes a Power Programmer III for your truck. I'd recommend it for several reasons. First is the added power it provides (and IMPROVES mileage). Second, you can input the gearing changes to correct your computer. Third, you can also input your new tire size, to correct your speedo and odo. Best $350 you can spend on the truck! It only takes about 20 minutes to program the truck, and 10 minutes to go back to stock settings, for service work.





I concur. I would personally go with 3.73's
_________________________
Texoma Off-Road
"Just roll with it!!!"


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#117718 - 09/28/04 07:22 PM Re: Chevy rear gears. [Re: mahana79]
WannaRace Offline
Gang Daddy

Registered: 11/21/03
Posts: 447
Loc: Kingwood, TX
GREAT!!!!

Thanks Tom and Justin for your input. I will go with the 3.73's I'm so glad you all helped me out with this. I will order the gears and find someone who can install them right.


Paul
_________________________
MSRA/Outlaw

Hannah PW50
Aaron KX65
Mom 4 Wheeler
Dad VTX 1300 Retro

There is no car... for any price... as cool as a motorcycle... and there never will be!











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#117719 - 12/29/04 12:43 AM Chevy rear gears. [Re: mahana79]
chevdude Offline
New Member

Registered: 12/29/04
Posts: 1
i have a question. i also have a 1999 chevy c/k 1500 5.7L. every thing on it is stock except for a lift kit which is six inches and a exhaust system.i think i am striping or already have stripped my spider gears. i want to put in limited slip. the manufacturer is auburn gears.anyways, i want to know what the gears are and bolts. it tows 5,000lbs. and most of all will limited slip help my spider gear problem or do i still have to replace them too. i dont know if i have 3.08 or 3.42 and if i should put up or down in it. if it helps i off road alot and want something that could pull up hill easy but still nice on the road.









thanks, chevdude

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#117720 - 12/29/04 05:37 PM Re: Chevy rear gears. [Re: chevdude]
blazerman1080 Offline
Gang Member

Registered: 09/09/04
Posts: 1
Loc: Austin, Texas
Hey Chevdude email me. I work for GM and can get you all of the info that is specific about your truck without having to jack it up or decipher RPO codes on your SPID label.
sscamarofan11@aol.com

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