improving fuel milege??? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

82c10 · 02-10-2007, 03:14 PM

Quote:

Originally Posted by ocbaud

the mustang ran a best of 14.2 @ 100mph

the truck ran a best of 15.09 @ 90mph with 2 flat cam lobes, open rear end with 2.73 gears and an untuned carb(which it still is)

we can change that, tv is open on sundays

KShortell · 02-14-2007, 05:00 PM

A TH700R4 would get more fuel economy, but probably only into the mid-teens with a 3.73 rear end.

If it's any consolation, the 350 / TH700R4 / 3.73 / P235/75R15XL driveline combination in my 5,400-lb. 1986 C10 Suburban only gets about 12.5 m.p.g. on average. I got into the upper mid-14 m.p.g. range once about 12 years ago...

BTW, knock on wood, I've still got the original 142,000-mile TH700R4 in her. I've put over 7,000 towing miles on it myself. The boat/trailer combo weighs in around 3,400 lbs.

Good luck!

86swb · 02-14-2007, 09:26 PM

Quote:

Originally Posted by Slonaker

For wgat one will cost, you could buy another truck. I'd love to have one, but not for that kind of money.

http://www.gearvendors.com/

Slonaker

If you did put one of those gearvendors over/under behind a 350 how would you go about changing the gears? I know when you are in first gear you have a low first then a high first and so on with the rest of the gears. Does the truck go through all six gears on its own? I am like you. Would love to have one but the $$$$$

They say if you have a 3:73 the over/under would put the 3:73 back down to a 2:90 on the road. Take off would be like a 4:10.

lurch115 · 02-14-2007, 11:22 PM

just be happy with what you have....my 355 is running on 9.5:1 compression and the rest is setup basically how yours is only on a 4:11 gear.....i've got 33x12.5X15's and a 700r4 with a shift kit and still only pull AT BEST about 9mpg.....

if you want milage i have an '03 focus you can buy.....*LOL*

lurch115 · 02-14-2007, 11:26 PM

Quote:

Originally Posted by bulky

You could always do the "Poor Man's" Gear Vendor..... This is an old "DoodleBug" for sale up here locally. It has a 4 speed attached to a 3 speed.

i have a 327 out of an old massey combine that i wanna go through...how much you want for that little "doodlebug".....it'd make one heck of a wheel stander...

82c10 · 02-14-2007, 11:36 PM

Quote:

Originally Posted by lurch115

just be happy with what you have....my 355 is running on 9.5:1 compression and the rest is setup basically how yours is only on a 4:11 gear.....i've got 33x12.5X15's and a 700r4 with a shift kit and still only pull AT BEST about 9mpg.....

if you want milage i have an '03 focus you can buy.....*LOL*

he has an 01 mustang gt for his daily
mustang>focus

Russell · 02-15-2007, 01:32 AM

Three words for getting great mileage... Sequential Fuel Injection.

There are guys getting 18 mpg out of 383s in third gens running off an 01 Express Van OBDII ECM

ElGracho · 02-15-2007, 05:26 AM

Swap in a 6.2 Diesel.

bulky · 02-15-2007, 07:29 AM

Quote:

Originally Posted by lurch115

i have a 327 out of an old massey combine that i wanna go through...how much you want for that little "doodlebug".....it'd make one heck of a wheel stander...

It's not mine, I have been looking for one to play with out in the fields with the kids. I found it on Craig's list in CT. I asked a couple of times how much hte guy wanted for it, only reply was "best offer". I think he'll have it in the yard for a while.

Here is a cool Craigslist tool, if you want to search for it. http://www.craigshelper.com/

02-14-2007, 05:00 PM	#27
KShortell Registered User Join Date: Oct 2003 Location: Chesapeake, VA Posts: 734	Re: improving fuel milege??? A TH700R4 would get more fuel economy, but probably only into the mid-teens with a 3.73 rear end. If it's any consolation, the 350 / TH700R4 / 3.73 / P235/75R15XL driveline combination in my 5,400-lb. 1986 C10 Suburban only gets about 12.5 m.p.g. on average. I got into the upper mid-14 m.p.g. range once about 12 years ago... BTW, knock on wood, I've still got the original 142,000-mile TH700R4 in her. I've put over 7,000 towing miles on it myself. The boat/trailer combo weighs in around 3,400 lbs. Good luck! __________________ Semper Paratus

02-14-2007, 11:22 PM	#29
lurch115 Registered User Join Date: Oct 2006 Location: iowa Posts: 722	Re: improving fuel milege??? just be happy with what you have....my 355 is running on 9.5:1 compression and the rest is setup basically how yours is only on a 4:11 gear.....i've got 33x12.5X15's and a 700r4 with a shift kit and still only pull AT BEST about 9mpg..... if you want milage i have an '03 focus you can buy.....LOL __________________ "Horsepower is how fast you hit the wall, torque is how far you carry the wall with you." '84 chevy half ton short box 2wd, 67,000 actual miles '03 chevy 1500 HD crew cab 4x4 standard box, 6.0L

02-15-2007, 01:32 AM	#32
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: improving fuel milege??? Three words for getting great mileage... Sequential Fuel Injection. There are guys getting 18 mpg out of 383s in third gens running off an 01 Express Van OBDII ECM __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

02-15-2007, 05:26 AM	#33
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,553	Re: improving fuel milege??? Swap in a 6.2 Diesel. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed



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