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Mechanics' some HELP

Discussion in 'The Garage' started by bambamtama, Jan 7, 2004.

  1. bambamtama

    bambamtama Registered Member

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    Mechanics\' some HELP

    I am running a 383 under the hood...new block, heads, etc. but the carb is a rebuilt.
    The problem is the action of the traction. When I'm in 2nd and start traveling it's alright, but when I shift into the next gear (3 speed manual) it seems it lost almost 1/4 of it's power and it like starts to jerk, Like it's not getting sufficient power. Would it be my distributor and spark plugs? I have a ACCel distibutor on it...what are your suggestions to the matter. Thanks Guys!
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Mechanics\' some HELP

    Do you have a tach? If so, what rpm are you shifting it at? It sounds like you're lugging it...

    The SM465 is pretty wide ratio, so when you go from second (3.58:1) to third (1.70:1) the rpm's drop about 50% and so does power unless you shift at a high enough rpm. From third to fourth (1:1) it's not quite as bad but still bad enough.

    When I still had my 350 I'd shift at 2800 rpm most of the time, which would drop it down to 1400 or so in the next gear.

    Rene
     
  3. bambamtama

    bambamtama Registered Member

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    Re: Mechanics\' some HELP

    Thanks Rene, I was also thinking too, that maybe my gear ratio might have some effect to it(rear axle)...no? yes?
     
  4. R72K5

    R72K5 Banned

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    Re: Mechanics\' some HELP

    what axle ratio do you have ? and what rpm range did you build engine for ? and what rpm range do you usually run ?
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Mechanics\' some HELP

    Tall gears will make the problem worse, although I drove my Jimmy with 2.76:1 gears and 33's for quite a while...

    Rene
     
  6. bambamtama

    bambamtama Registered Member

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    Re: Mechanics\' some HELP

    will tghe engine was replaced with a new one. They took out the 350 and put in a 383(350 with a 400 crank 4 bolt main) and so I really haven't tested the compression and the timing yet. BUt I'm running at 600 rpm idle. I'm still running he factory gears with 33's what would you recommend? For those size of tires?
     
  7. Confedneck

    Confedneck 3/4 ton status

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    Re: Mechanics\' some HELP

    33s? if its a 700r4 everyone here will tell you to run 4.10s or 4.56s.. but if its more of a daily driver you could go 3.73s
    chevy4wd has a 700r4, 3.73 gears and 33" all terrains
    i have a sm465, 3.40 gears and 33" wild countries
    he has more top end and better economy... but i have more low end due to the transmission gearing..
    it all depends on usage.. /forums/images/graemlins/thumb.gif
     

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