[BFix] Gearing for Best Mileage

[FRANK w]

So if you were to keep the 35's all the time would you stay with the 4.56 or would you go with the 4.88. I have a 5.8, ZF 5 speed, 35" tires and getting ready to buy gears. I thought of going with the 4.88's. Thanks.

Frank 


----- Original Message ----- 
  From: Ken<mailto:broncokak at yahoo.com> 
  To: NHieger at aol.com<mailto:NHieger at aol.com> ; q.dusenberry at comcast.net<mailto:q.dusenberry at comcast.net> ; bfix at broncofix.com<mailto:bfix at broncofix.com> 
  Sent: Saturday, May 03, 2008 4:21 PM
  Subject: Re: [BFix] Gearing for Best Mileage


  I have a 5.0L Explorer motor and the ZF 5 speed, 4.56 gears and 35" tires. When I drove to VA for the Round up last summer I constantly got 20MPG on the hi-way if I kept the tach below 2500RPM (70MPH) the worst I got was 13MPG and that was traveling at 80MPH. I too thought about going with the 4.88 gears but after driving both on road and off. I'll keep the 4.56 gears and maybe run some 33" street tires for all the around town drive I do.  Last fall I drove about 75 miles from home (150 round trip) to run with some J**p guys and spend 6 hours in low range and only used 7 gal.s of gas. I've never really checked the mileage doing around town driving but I'll have to some day.



  Ken


   
   68 EB 5.0L / ZF 
  35" BFGs / 3" Lift
  4.56 ARB Front & Rear



  ----- Original Message ----
  From: "NHieger at aol.com" <NHieger at aol.com>
  To: q.dusenberry at comcast.net; bfix at broncofix.com
  Sent: Saturday, May 3, 2008 5:23:35 PM
  Subject: Re: [BFix] Gearing for Best Mileage


  FWIW, I have 4:56's in my 77 5.0 sefi/AOD, 35" BFG's. Everything was pretty good when I was running 33's, but now that I am running 35's I kind of wish I had gone with 4:88's. I just seem to be a bit over geared when on long extended climbs at freeway speeds & heading into strong winds. What I need is gear right between 3 & 4th. Having said that if I keep the speeds down (55 or less) I can get around 17 mph.

  Norm

  In a message dated 5/3/2008 11:50:04 A.M. Pacific Daylight Time, q.dusenberry at comcast.net writes:
    Thanks for the reply. That sounds about right to me. 4.56 for 33 with OD and 4.88 for 35 with OD. I'm tempted to go with 4.88’s in the event that I end up with 35’s in the future.









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