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66 chev pickup C10

Discussion in 'New to the H.A.M.B.? Introduce yourself here!' started by LARRY R PEDERSEN, Aug 20, 2019.

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  1. LARRY R PEDERSEN
    Joined: Aug 20, 2019
    Posts: 1

    LARRY R PEDERSEN

    At 48 MPH I am turning 3000 rpm what can I specifically to reduce rpm and increase MPH...this is a standard 3 speed on the tree, V8 any suggestions would be welcome ...I am a
    Newbie
     
  2. Unique Rustorations
    Joined: Nov 15, 2018
    Posts: 623

    Unique Rustorations
    Member

    Welcome from Indiana Larry. People around here will help but you are slightly outside the year range here (H.A.M.B. rules are ‘65 and older). But still list more details so they can help. Tire size and axle ratio is a good starting point. Regards, Randy


    Sent from my iPhone using H.A.M.B.
     
  3. DDDenny
    Joined: Feb 6, 2015
    Posts: 19,136

    DDDenny
    Member
    from oregon

    Unique Rustorations likes this.
  4. catdad49
    Joined: Sep 25, 2005
    Posts: 6,399

    catdad49
    Member

    These trucks were geared more for short hauls, so a rear axle ratio change may be in order. Also, these trucks came with relatively tall tires, so if it has tires of less 27" tall that could be an issue. More specs./pics would help.
     

  5. ol-nobull
    Joined: Oct 16, 2013
    Posts: 1,655

    ol-nobull
    Member

    Hi. I believe that year had either the 250 or 270 six cylinder engine and they were good running engines so unless they have major problems they should perform well for you unless you plan on racing the truck. As already stated you need something like the 3:55 ratio rear end ratio (not 411) and tire sizes of around 28.5" diameter OR larger to get better millage. OR an overdrive tranny. My avitar photo here is of the 235 CI chevy engine in my 46 Chevy coupe. Original set up was the 216 engine with a 411 rear end & 600 16 tires. Changed out engine to 235 six cylinder and rear end to truck ring & pinion with 355 ratio and rear tires and gas millage went from 16 at 55 MPH to just over 20 MPG at 65 MPH with original 3 on the tree tranny. That included boring the 235 engine to 0.060 over with hot cam and dual 2 bbl carbs & headers. I got rear ended last year and due to circumstances it will likely be next year before I can get it back on the road. Good luck with yours. Jimmie
     

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