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Diesel convertion /Tire size

Discussion in '1982-Present GM Diesel' started by earl87gta, Jun 2, 2005.

  1. earl87gta

    earl87gta 1/2 ton status

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    Hey guys Im puting a diesel in my 72 . this is what i have doner truck with 6.5 SM465. My blazer has 14blt ff and D60 with 4:10 gears. I havent made up my mind if Im going to change to a 700r4 or use the 465 it has a t350 in it now and I have a few 700r4 laying around so it wouldnt rilly be a money issue ether way. what size tires should I go with i would like to go as big as I can with out changing the 4:10 gears. I do have a second truck with same axles and 4:56 but they were in the truck when i got it and dont know much about the history the set with the 4:10 is all new exept the case.
    Thanks
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You could run 38's or even 39.5's with those 4.10's and the SM465. At 65 mph with the 39.5's the motor would be turning 2270 rpm which certainly isn't bad for mileage or power IMO. With 38's it'd be turning 2360 rpm...slightly better for power, slightly worse for fuel mileage.

    The 465 seems to overcome the taller gearing better than an auto does, and won't burn itself up. with 4.10's and anything bigger than 33's I'd say the 700R-4 would be out of the question.

    I run 4.56's with 39.5's with an SM 465...power and acceleration is good, but I could definitely stand a few less rpm's on the freeway.

    Rene
     
  3. earl87gta

    earl87gta 1/2 ton status

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    Thanks,
    it sounds Like i will just keep the 465 .sounds like it will work out perfect.
     
    Last edited: Jul 10, 2005
  4. earl87gta

    earl87gta 1/2 ton status

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    I saw a set of the 49 in Irocs today I wounder what it would take to get them under the blazer?
     
  5. imiceman44

    imiceman44 1 ton status

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    You wouldneed to relocate the front axle.
    It would hit the firewall no matter how high you lift it.
    Also you willneed to limit your turning or it will hit the frame behind the axle when turning full lock.
    :D
     
  6. yunit

    yunit 1/2 ton status

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    I might dismantle the truggy and put the axles with 5.13's in my 6.2 K5 and run some 37" tires; not too sure which ones yet. The engine should be turning about 2200 RPM's with a 700R4 in the mix, not too bad since it will not be a daily driver.
     
  7. earl87gta

    earl87gta 1/2 ton status

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    Mabe I should wait for a burb for the 49s to go on.
     

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