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RPM's

Discussion in 'The Garage' started by no1uknow, Aug 8, 2005.

  1. no1uknow

    no1uknow 1/2 ton status

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    What is the highest RPM's I can run my 454 engine without damaging it on long trips? I have a 700r4 and 35's.............
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    What gears in the rear ? That will be needed as well to determine theoretical engine RPM .

    This would help http://www.4lo.com/calc/geartable.htm

    Its gonna be lower rpm for you since you have overdrive .

    running it between 2000 and 3000 rpm won't hurt a thing .
     
  3. Zeitler

    Zeitler Registered Member

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    i don't know much bout bigblocks ...but with their torque , won't it be possible to run at like 1500-1700 rpm for maximum mpg?
     
  4. no1uknow

    no1uknow 1/2 ton status

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    I don't know what gears are in the rear, but I am asking because I want to know what are the lowest gears I can get away with when I change them........
     
  5. redneckdude

    redneckdude 1/2 ton status

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    You could get away with 5.13s since u have an OD trans. RPMs would be kinda high for a big block, but would be about right if u ever went to a 37 or something similar. If you have thought about goin bigger, get 5.13s. If not, 4.56s would be good...i vote 5.13s
     
  6. perp

    perp 1/2 ton status

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    if you run your BBC over 3k for any length of time you will feel it in wallet (gas) and see it on the temp guage. as stated befor keep it under there and you be fine
     
  7. no1uknow

    no1uknow 1/2 ton status

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    Wouldn't the 5.13 be weak in the d44? Any Idea what RPM's I would be doing with 5.13 doing 70 mph? I don't know what gearing I have right now but doing 65 in od I'm around 1800 without around 2200 gas isn't that bad but I would like more power. BTW I am planning on throwing on some 36/14.5/16.5 when I am through with my 35's.........................
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Just using a online gear calculator , 1800 rpm with 700r4 OD , tranny in hi ( 1 to 1 ) , and 35's comes out to about 4.10 gears . Do you have a 14 bolt ?

    Oh , just checked your profile you do have a 14 bolt . Could very well be 4.10's already in there then .

    With that tranny , torque converter , and gears , as long as your staying 35's/36's , its allright for now . Spend your money on other stuff like lockers and recovery equipment .
     
  9. no1uknow

    no1uknow 1/2 ton status

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    I'm planning to get lockers aswell just wanted to change everything while I was in there ;) ..........
     

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