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Discussion in 'The Hokey Ass Message Board' started by chris dozier, Aug 5, 2016.

  1. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    Hbh
     
    Last edited: Sep 10, 2016
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 49,509

    squirrel
    Member

    should have 4.11 gears. You should be able to drive 55-60 with it, if everything is in good condition. If the engine etc. is worn out and makes a lot of racket at these speeds, maybe the rear end gears are not the problem?

    My son's 59 chevy truck with the six and 4 speed granny box, with it's original 3.90 gears, and not that tall 15" tires, cruises at 65 ok.
     
  3. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 27,217

    Jalopy Joker
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  4. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    My truck has the factory 6.00/16's and its screaming at 45. Mine has a 4 speed which I thought was weird for a 1/2 ton truck. Maybe I have the heavy duty 5.42 or 6.16 ratio but I'd assume it would be a 2 speed rear if so which it's isn't. I guess I need to take it apart to see what I have. The engine plasti gauged perfect. It's quite and has plenty of power. Good compression too.

    Thanks so much for the response
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 49,509

    squirrel
    Member

    the chevy specs show either 3.82 or 4.11 ratio offered in the half ton, although only the 4.11 was available with the 4 speed trans. Maybe you could put a tach on the engine, and see how fast it's turning. It's not easy to count the gear ratio turns with a torque tube, although you can pull off the rear cover and count teeth or turns. and you'd want a replacement cover gasket before you do that.

    39truck.jpg
     
  6. Maybe not what ya had in mind but a T5 swap might be the ticket. I know a T5 in our crate really helps the flathead 8 come to life. Just a thought........................
     
  7. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    Hhhh
     
    Last edited: Sep 10, 2016
    greasemonkey54 likes this.
  8. Tim
    Joined: Mar 2, 2001
    Posts: 12,805

    Tim
    Member
    from KCMO

    Taller tires!

    But honestly my first thought after reading all the posts is to at least temporarily install a tach.

    Between the road noise and the engine noise it's gonna be loud at speed, I think a lot of us are used to late models cruising 70 at 1200 rpm

    If the engine checked out good as you state I would be curious to see what the tach says. Could just be loud at that rpm even though it's got room to spare.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 49,509

    squirrel
    Member

    should only be getting up to 3000 at 60, which is just fine....
     
  10. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    Ok, just drove it on the highway. The truck literally runs out of rpm at 55 mph. It's screaming at 4900rpm
     
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 49,509

    squirrel
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    what gear is the transmission in? :)
     
  12. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    Lol, 2nd duh!
     
  13. Moriarity
    Joined: Apr 11, 2001
    Posts: 21,605

    Moriarity
    SUPER MODERATOR
    Staff Member

    4900 rpms should be 100 mph. do you have the correct tach in it? is the clutch slipping? or as Jim said are you in high gear??
     
  14. F&J
    Joined: Apr 5, 2007
    Posts: 13,223

    F&J
    Member

    If you can get to the crank pulley and turn it?

    Jack up only one rear tire. Put a chalk mark on the driveway at the tire chalk mark.
    put a chalk mark on the crank pulley at dead top, or some spot you can see. Truck in high gear.

    One person watches the rear tire and you start to turn the engine by hand. Have your helper tell you when it is exactly two turns on the tire. If you turned the pulley just a tick past 4 turns, you have 411.


    I just swapped an entire rear end in my stock 32 Nash because it had 4.73, which would give 40 mph sweet spot on the motor. I now have a mid 60s rear that I can get any aftermarket ratio I want for $150

    I'm on your side with RPM. I'd sell the vehicle if I could not do 60 without having the motor sound like the pistons are "swappin' holes" :)


    .
     
  15. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    4th gear, I'm almost positive the tach is correct? Negative side of coil. Idles at 900 rpm. Clutch works fine. I can floor it in high gear from 20mph and it doesn't slip at all.
     
  16. miker98038
    Joined: Jan 24, 2011
    Posts: 623

    miker98038
    ALLIANCE MEMBER

    Is the tach set for a 6 or whatever? It's been years, but I seem to remember some tachs having a 4-6-8 switch/jumper/connection.
     
  17. squirrel
    Joined: Sep 23, 2004
    Posts: 49,509

    squirrel
    Member

    if the tach is set to 4 cyl and you install it on a 6 cyl it will read 33% fast.

    I like the suggestion above to count turns of the crank pulley and tires, and figure out exactly what your gear ratio is.

    Let us know! this one is interesting
     
  18. chris dozier
    Joined: May 7, 2008
    Posts: 214

    chris dozier
    Member

    I did the crank and rotation of the tire trick... 4.11's for sure.
     
  19. F&J
    Joined: Apr 5, 2007
    Posts: 13,223

    F&J
    Member

    You will see a big change if that later housing with aftermarket 3.55 will fit.

    But, don't expect miracle changes in how it sounds at 65 in the slow lane on expressway.

    The guys with stock 40s Dodge pickups use a later Mopar 3.55 rear, and I was just in one a while ago, on a short connector highway. His speedo gear was not corrected, so no speed reading. But I felt we were doing 60-ish, maybe touching 65, and the road noise/cab tinny-ness, made it tough to hear the RPM, but I was not too thrilled if it had to go 50-100 mile trip on the highway.

    Main problem with going to a lower number under 3.50, is that on certain long grades, you can run out of power and speed slowly drops. You can't downshift at 50, so on a real bad looong hill, you are hugging the gutter where all the glass and nails are, trying not to get rear-ended

    .
     

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