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Better gas mileage with a 700-r4

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by az84chevy, Jul 19, 2005.

  1. az84chevy

    az84chevy Registered Member

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    Recently i have been running my 700-r4 in 3rd gear instead of overdrive when im under 55-60 and i have been getting much better gas mileage. From about 6 to around 9-12. Seems to be lugging a lot less than it did when it was when it was in overdrive.

    Although i'm sure most people already know about this, i just figured i would throw it out there for the people that might not know.

    Just for reference my truck has a 4 inch lift and 33's.
     
  2. muddybuddy

    muddybuddy 3/4 ton status

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    hmm...sounds like something i need to try. i currently get bout 8 or 9 with overdrive. ill give it a shot.
     
  3. 89K5guy

    89K5guy 1/2 ton status

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    I just bought my 89 last week and drove it home to Ohio from Pa (260 miles)
    and had to leave the trans in drive.It still has the stock gears (probably 3.08s)with 33s so overdrive was out of the question.Definitely need the gear
    change to use the overdrive. :D
     
  4. muddybuddy

    muddybuddy 3/4 ton status

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    wow, i must have gotten really lucky to find mine with 373s stock.
     
  5. Cmoe

    Cmoe 1/2 ton status

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    What gears are you running?
     
  6. Jonny-K5

    Jonny-K5 1/2 ton status

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    3.73's are still too high for overdrive and larger than stock tires IMO.i had 3.73's stock in my truck, it sucked with 33's. i'd say 4.10 min. for 33's, 4.56 min. for 35's.
     
  7. Thunder

    Thunder 3/4 ton status

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    I run 33" MT tires and 3.73 GR. /700r4. I think its fine and have absoultly no problems. Get at least 15 mpg Average DD city& highway
    I run in drive in town and OD anything over 55.
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Damn, I drive around in OD all the time with 33's and 3.73's , and I average 15 mpg . Less if a/c on :D
     
  9. az84chevy

    az84chevy Registered Member

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    Damn, found out im actually gettting 9, i was adding up my 12 gallon tank instead of my 15 when doing the mileage. 15 mpg would be great. What carb are you guys running?
     
  10. Thunder

    Thunder 3/4 ton status

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    No carb. I have TBI.:thumb:
     
  11. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Stage 1 q-jet from I-5auto in cali :D
     
  12. MarcS

    MarcS 1/2 ton status

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    Definatly need gears.
    Also adjust the TV cable. My truck was real slugglish with lousy down and upshifts. It made a noticeable difference. Only takes a minute to do.
     
  13. opfor2

    opfor2 1/2 ton status

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    I’m a little confused on how to properly adjust the TV cable on my 90 K-5. According to the service manual there should be a little clip that you depress while opening the TBI to WOT. What clip are they talking about? I’ve looked at the TV cable and I just don’t see it!

    Dan...
     
  14. MarcS

    MarcS 1/2 ton status

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    Go here Bowtie Overdrives TV 101

    A long article but it explains everything. Good pictures. Scroll down to find how to adjust.
     
  15. hi pinion

    hi pinion 3/4 ton status

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    Dont you guys know your going to fry the tranny that way??? Its like starting out in 4rth gear lol, like starting off on a 10 speed in 10th gear lol. I blew up 2 trannies not knowing that. ALWAYS start off in 3rd , otherwise it blows stuff up. :D
     
    Last edited: Jan 4, 2006
  16. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Well its been how long , and how many wheeling trips , and a trip to and from Moab ......WHEELING MOAB , and its still shifting solid :D

    It actually starts out in first gear , shifts to second gear , then to third , and then to fourth . Remember , theres a switch for lockup , and a TV cable , its not going to be in OD if you are accelerating . And besides I only TOW in 3rd , and WHEEL in 3rd or 2nd or 1st :wink1:
     
  17. lamberthkp

    lamberthkp SITFU Premium Member

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    i need lower gears myself got 3.73 at the momment . i have to run around in 3rd, in od at 45 im only making 1100rpm with the 35's. hopefully i'll find a good 14ff with low gears soon.
     
  18. Blue85

    Blue85 Troll Premium Member

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    Well there really isn't any difference between 3 and OD until you get to a high enough speed to shift into 4th gear. If you're never going faster than 35mph then it doesn't matter. It's running around 40-50mph where the transmission will want to drop into 4th whenever the throttle is low. Then running in 3rd at least saves a lot of shifting.

    It's in 2 and 1 that the line pressure is increased.
     

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