02 February 2022

Fun With Math

Doing some napkin calculations for the potential '47 Fleetmaster project.  3-Speed Chevrolet 341 manual and a 4.11 differential.

The donor engine would be from a 2006 Trailblazer.

That car comes with a 4-speed 4L60E transmission and a 3.42 diff.

Where the fun begins is comparing ratios and speculating what the mileage will be...

I want to use a 6L50 6-speed for the swap.  It's got a much deeper first gear and closer ratios.

That means I can run a much taller rear gear and not sacrifice acceleration while still dropping about 500 rpm off at highway speeds.

Which we're going to need to do because the Fleetmaster has a drag coefficient of 0.7 compared to the 0.45 of the Trailblazer.  The Trailblazer is not known for sipping fuel...

Posted by Angus McThag at 00:43
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4 comments:

  1. michigan doug02 February, 2022 14:16

    9 inch ford rear end, disc's all around,
    rack and pinon, coil overs.
    BRB going to e-bay to look at Fleetmasters.

    ReplyDelete
  2. retired wrench02 February, 2022 16:39

    Have you seen the 1950 lime green fleet master with the Atlas 4200 transplant? Article in Jennings motor news,Dec 2017 belongs to Neil DeAtley.

    ReplyDelete
    Replies
    1. Angus McThag02 February, 2022 19:38

      I have not!

      Delete
    2. Angus McThag02 February, 2022 20:05

      https://www.hemmings.com/stories/article/1950-chevrolet-fleetline-de-luxe

      Delete

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