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1989 International S1600

Discussion in 'Performance & Upgrades' started by S1600, Oct 22, 2019.

  1. S1600

    S1600 Registered User

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    I bought an ex u haul truck. With only 188,00 miles. 7.3 with 5 speed with super low 1st gear. I think the trans is a clark or spicer. Truck looks like its only a couple years old under the hood or underneath.Motor even looks new,maybe it was a replacement? Got it from a church. It has a 26 foot box and is the low profile version with air bags in the rear. I think it has the 4.33 rear gears as the truck will run 65 on interstate. I am going to use the truck as a toy hauler (only motorcycles). But the trips I will take are anywhere from 5-10 hours. I really need to be able to do 75 on the interstate. I know the truck has a SAE 2 bell housing. Can someone please help me figure out a 6,7,10 speed transmission to help with my top speed? I plan on adding a turbo kit from hypermax. But before I drop $3k I want to try a trans swap first. Thanks in advance.
     
  2. DaveBen

    DaveBen Supporting Member Supporting Member

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    The number of shifts has to do with the lower end through to the top. The final Over Drive ratio is still pretty close to a 5 spd. I drove a 13 speed for years and all I remember is that I could shift 4 times going through an intersection.
     
  3. riphip

    riphip Supporting Member Supporting Member

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    Maybe you can find a 2 speed rear axle to get you there. Should be plenty out there.
     
  4. compressionignitionrules

    compressionignitionrules Full Access Member

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    Nice score, I agree on the 2 speed rear axle, might even score a better gear ratio in the high set. that would probably be your cheapest route. posting a pic of your new truck would be a great thing to share.............:popcorn.

    I watched for one of these trucks for years to put my 67 Merc 700 cab/front on but they disappeared too soon here in Ontario.
    and now they are a classic themselves.
     

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