![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
|
How bad is slipping tranny affecting mpg?
My third gear in my 69 turbo 400 is slipping. I am only getting 8-9 mph with rebuilt carb and stock 350. I do not know rear gears and am running 31" tires.
__________________
71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
![]() |
![]() |
![]() |
#2 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
|
Re: How bad is slipping tranny affecting mpg?
I guess mine is slipping, too. These don't get great gas mileage but a slipping tranny will probably have other symptoms than poor mileage.
Mine AIN'T slippiing and my mileage isn't much better. I put $10 in it every month, whether or not I drive it. It always needs it and it hasn't moved. Got a locking gas cap, too. Anyway, I changed out the flex hoses from the pump to the carb and the gas smell/leak went away. Should be better, now.
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
![]() |
![]() |
![]() |
#3 | |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
|
Re: How bad is slipping tranny affecting mpg?
Quote:
I thought with a quadrajet and keeping my foot out of it 12-15 was realistic. I hope it will be with a new tranny if not I may have to keep my new truck and sell the 69 to pay for the 72.
__________________
71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
|
![]() |
![]() |
![]() |
#4 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,923
|
Re: How bad is slipping tranny affecting mpg?
Chances are with 31" tires your speedo/odoemeter is offg also, so you are probably getting better mileage than you think. Gearing & the type tranny (slipping or otherwise) play a factor also. Obviously with a non-overdrive tranny you'll get worse. A turbo 400 does worse than a T350 because it tanks more to run the tranny...Again it may be small, but it does add to the overall mileage.
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
![]() |
![]() |
![]() |
#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: How bad is slipping tranny affecting mpg?
42% of the ppl responding to my poll http://67-72chevytrucks.com/vboard/s...d.php?t=172346 claimed 10 - 12 MPG.
If your tranny is slipping, there's no way of tellin how much extra fuelit's burning. Why do you think it's slipping? |
![]() |
![]() |
![]() |
#6 | |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
|
Re: How bad is slipping tranny affecting mpg?
Quote:
__________________
71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
|
![]() |
![]() |
![]() |
#7 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
|
Re: How bad is slipping tranny affecting mpg?
Thanks Lonhorn Man just looked at you poll that make me feel like I can improve a few mpg.
__________________
71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|