What MPG should I be getting? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

beeroh · 09-17-2003, 11:09 AM

What MPG should I have 4X4 longbed with 33" tires 4.56 gears w/posi and 700R4?

**Captkaos** · 09-17-2003, 11:31 AM

If you are lucky, you will break past 10mpg. More realistically expect about 8-10. After some tuning, it might get 12, but that is about the max for a 4x4.

apstguy · 09-18-2003, 05:53 PM

what engine? - BTW why do you have different gear ratios from front to back? that is very bad for the 4X4 system.

beeroh · 09-18-2003, 09:59 PM

I have 3.07 in the front
4.56 inthe rear

wuz up

Nvbowtie · 09-19-2003, 03:42 AM

Quote:

Originally posted by beeroh
I have 3.07 in the front
4.56 inthe rear

wuz up

Hmmmm May be someone switched one of the axels ?? I always thought they were to be matching ratios, otherwise the odd tire rotation would be hard to control on steering

beeroh · 09-19-2003, 04:40 AM

drove 107 miles and filled up 8gallons. = 13.375 mpg

to bad the speedo is off and not adjusted for my setup

so I am probably doing more like 10mpg

**Captkaos** · 09-19-2003, 09:41 AM

Quote:

Originally posted by beeroh
I have 3.07 in the front
4.56 inthe rear

wuz up

I hope you are not using 4 wheel drive in this thing, EVER! You can tear something up for sure if you do. You are putting undo stress on the drivetrain and this can pop a spider gear, u-joint or damage the transfer case. You REALLY need to address this issue. Ratio variance front to rear should be no more than 1% for the street and 2% for offroad.

beeroh · 09-19-2003, 01:24 PM

I had a friend of mine check it out for a few feet,
when I noticed the back tires skipping, I told him to stop
and get out of 4X4 mode.

sucks that I can't use 4x4, waiting and hopeing the guy that sold
me the truck will fix the problem

09-17-2003, 11:09 AM	#1
beeroh Registered User Join Date: Sep 2003 Location: Atascadero, CA. Posts: 149	What MPG should I be getting? What MPG should I have 4X4 longbed with 33" tires 4.56 gears w/posi and 700R4? __________________ 84 Silverado,

09-17-2003, 11:31 AM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	If you are lucky, you will break past 10mpg. More realistically expect about 8-10. After some tuning, it might get 12, but that is about the max for a 4x4. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

09-18-2003, 05:53 PM	#3
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	what engine? - BTW why do you have different gear ratios from front to back? that is very bad for the 4X4 system. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

09-18-2003, 09:59 PM	#4
beeroh Registered User Join Date: Sep 2003 Location: Atascadero, CA. Posts: 149	I have 3.07 in the front 4.56 inthe rear wuz up __________________ 84 Silverado,

09-19-2003, 04:40 AM	#6
beeroh Registered User Join Date: Sep 2003 Location: Atascadero, CA. Posts: 149	drove 107 miles and filled up 8gallons. = 13.375 mpg to bad the speedo is off and not adjusted for my setup so I am probably doing more like 10mpg __________________ 84 Silverado,

09-19-2003, 01:24 PM	#8
beeroh Registered User Join Date: Sep 2003 Location: Atascadero, CA. Posts: 149	I had a friend of mine check it out for a few feet, when I noticed the back tires skipping, I told him to stop and get out of 4X4 mode. sucks that I can't use 4x4, waiting and hopeing the guy that sold me the truck will fix the problem __________________ 84 Silverado,

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