3.25 rearends 9 speed Trans Converted to 13 speed. Want to upgrade

Discussion in 'Ask An Owner Operator' started by Brandon0928, Nov 16, 2022.

  1. abyliks

    abyliks Road Train Member

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    I’m surprised you wouldn’t want Atleast tall 22s for ground clearance if not 24s, 11r22.5 and a 3.55 i cruise about 1700 at 65 in 8th direct, almost wish I had 3.70s for the heavier stuff but I can make due

    I like my tires all the same size because I have ocd and that stuff irritates me
     
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  3. Brandon0928

    Brandon0928 Light Load Member

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    I just like my truck to run the same sizes as my trailers. Cattle pot and hopper . I was talking to a fella at Peterbilt and he said the best set up if I wanted to put in a 18 speed is to run 3.42’s. Hmmmmm . I wouldn’t mind haveing 3.55’s. Had them in a previous truck with a 13 speed
     
  4. Long FLD

    Long FLD Road Train Member

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    I’ve always ran low 22’s and rarely drove faster than 70 when I was hauling cattle. This truck had 3.70’s and a series 60 Detroit with a 10 speed.

    A8C21A9B-0ED5-4825-A3F5-16E2B52CDDA0.jpeg

    This truck had 3.55’s with a 2LW Cat and a 13 speed.

    66CEC1F8-9D9C-42ED-9599-9AD052B8043B.jpeg

    This truck had 3.36’s and an MX13 Paccar with an 18 speed.

    3EF672DF-F107-47F5-A441-B3549AA29DA7.jpeg

    If you want to run 70mph or lower and be in that 1600 range or so I’d say 3.55’s after you wear out your 3.25’s.
     
  5. Brandon0928

    Brandon0928 Light Load Member

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    I think that’s what I’m leaning towards. I seem to go 65 mph most of the time in SD and NE. In iowa 55-60mph. Even when I go out west I only run 70mph and on a hunch I might go 75mph
     
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  6. Brandon0928

    Brandon0928 Light Load Member

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    Cpl4342
     
  7. NYStarcar

    NYStarcar Light Load Member

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    It would really depend on how you like the truck to perform. If you want a little more low end I would say go with the 3:55 with the low pros
     
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  8. lester

    lester Road Train Member

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    I hate to derail this thread, wait no I don't.
    Snowwy please explain to us why all the drums and tires need to be the same size for optimal effectiveness
     
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  9. NYStarcar

    NYStarcar Light Load Member

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    Mismatched tire sizes on a car with 4 wheel ABS would make the brakes work like crap but I don't see how it would affect two or more separate units hooked together.
     
  10. gekko1323

    gekko1323 Heavy Load Member

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    I have an 18-speed Series 60 with 3.55 rears. It is an absolute COW on hills.
     
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  11. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Yea don’t say nothing….!!!
     
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