Final drive and high revs...

[jmbrodsky@domain.elided]

        Tom,
               I don't know about anyone else, but I shudder to admit this.  I 
had to take my Travelall 392/727 31s, 3.54, to almost 4200 rpm (60mph, 2nd gear)
to get up some of the hills in Colorado.  Of course, this was in order to 
maintain speed.  So I would guess that 4500 would not be a problem.


     -Joel Brodsky

         '76 IHC Scout II 345/tf727 RE8000, Cibie40s, custom 
                rear tire rack, 6 different color body panels.
                Not much sport, all utility.
         '75 IHC Travelall 150 4wd 392/tf727 Hummer brush guard, 
                3/4T rear springs, Hella Rallye 2000s, Con-Ferr 5x7,
                Class IV hitches front and rear, 3" Exhaust.
                1st Place, Rocky Mountain IH Rendezvous,
                3rd Place, Tulare IH Western Regionals

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Date: Tue, 11 Aug 1998 18:29:31 -0700
From: Tom Harais <tjhemh@domain.elided>
Subject: Re: Final drive ratio

Guys:

I don't know about this discussion of a 345 turning 4500 RPM at 65 MPH.

My references tell me that the IH 345 will only go to 3800 RPM before
the springs just don't have enough poop to prevent valve float. My
research tells me if you use Chevy or Dodge springs, you can run it to
5000 without encountering valve float. But those springs are almost
twice the force at 1" open than the original IHs.

Somebody go look up in one of the available FAQs what gearset you'd have
to have with 30" tires to be turning 4500 RPM at 65 MPH. That must be
the 5:88s in the "big" 44 housing.

Tom H.

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