So I would like to find a 2.41 or 2.56 rearend

Discussion in 'Transmission & Driveline Topics' started by f-body, Mar 21, 2010.

  1. f-body

    f-body Veteran Member

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    Well I sold the 74 with the 2.41 posi in it today. I still have the 74 with the 4.11 gears hope it sells tomorrow.
     
  2. Its_not_a_transam

    Its_not_a_transam Veteran Member

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    Graveyard thread but I'm staring at one to drop in my stripped 80. 406 sbc super t-10 . Commute time :)
     
  3. f-body freak

    f-body freak Veteran Member

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    Seein this old thread with Fbody & Kamikaze & flowjoe & blades67 & cataldo & Louich... Bunch of guys with thousands of posts that dont come on here anymore. Guess losin twozs has me wonderin how the rest of these guys are doin? Chevrolaine, Buickfunnycar. Sure there's some others Im forgetting. Hope everyone is well & doin good
     
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  4. Its_not_a_transam

    Its_not_a_transam Veteran Member

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    Love digging in thr grave yard
     
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  5. 76z28

    76z28 Veteran Member

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    Heck just brining up this thread reminds me of how many times I have read it and thought about going to a higher gear. I'm thankful for overdrives so I can have my cake and eat it too.
     
  6. jeff swisher

    jeff swisher Veteran Member

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    I like old threads also but I like numbers even more..here are a few to chew on.

    1978 Nova STOCK 305" 2 barrel with dual pipes or single it would get 18 MPG Recurved the distributor and it went quicker and still got 18 MPG.
    I later stuck a 350" into it with 268H cam and ported and milled 624heads 72cc chambers still running the 2.56 rear gears.
    18 MPG.
    Switched to a 308 rear gear and 400-600 over stock stall converter and recalibrated the speedometer with a gear change.
    20.5 MPG best and 18 with spirited driving tossed in.
    The 305" never got 20.5 always 18 MPG.

    The .308 gear and the converter would pull from a stop much easier with less throttle it seemed.
    Not lugging around basically.

    I later got tired of breaking rerends and went 9" and had 2.29 and many other gears.
    I was running 3.70 gears and pulling 15 mpg with lots of RPM and spirited driving tossed in.
    I thought heck how about some 2.29 gears for a long trip I was going to do often.

    I swapped in the gears and my MPG went to 8 !
    Yes eight mpg.
    It hit me before I went through another tank of fuel..My timing was all in around 2200 RPM.
    I was cruising the highway at way under that.
    I had to really tweak the distributor to get my curve all in by the low cruise RPM 30" tall tires and 2.29 gears were giving me.

    I ended up getting 18 MPG once dialed in.
    That was with ported and milled to 54cc #186 casting heads and 270H comp cam in the 350".

    Pulling my small boat down the highway with the 2.29 gears and my 31x10.5 x15 tires and a hot rod Olds pulled beside me at 70 MPH and racked his pipes.
    HA! sucker . I dropped into first gear in the TH350 and it was on. 6500 in first then shift.
    Run to 5500 in second and it just quit pulling RPM and I was looking at his back seat.
    I shift to third and about a second later my car is in front of him and walking away.
    He gave up.
    Gears did not hurt my MPG that much really. But they did allow me to drive faster and get the same or close to the same MPG.
     
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  7. Its_not_a_transam

    Its_not_a_transam Veteran Member

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    10.5-1 sbc 355. Worked 492 heads. Xe 268 cam. 14 degrees Initial. 3.42 rear and a 4 speed. Hwy is 15-17 mpg
     
  8. Marks71BB

    Marks71BB Veteran Member Lifetime Gold Member

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    Sad to report we lost one of my best friends on the planet at the end of February of this year. RIP Sy


    http://www.galtheraldonline.com/new...RrLtaJVaDokOkV8WLK3AQ0_drlQf1AsZTlO7OHC4NahV0
     

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