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    Author Topic: changing speedo gear in transmission  (Read 4376 times)

    Offline wantone

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    changing speedo gear in transmission
    « on: August 21, 2015 - 05:06:49 PM »
    My speedo is off because I have a new taller tire set and new rear end gears.   Can I change speedo gears (new tooth count) without removing the trans - erg- can I do this as a new*** mechanic w/o Killing myself or the car?
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    (O O {]{]{]||[}[}[} O O)
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    Offline Katfish

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    Re: changing speedo gear in transmission
    « Reply #1 on: August 21, 2015 - 05:59:54 PM »
    Yes, very simple, unbolt it and slide it out.
    Slide the new gear in, paying attention to the clocking.  It's clearly marked on the housing.
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    Offline RzeroB

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    Re: changing speedo gear in transmission
    « Reply #2 on: August 21, 2015 - 06:27:43 PM »
    Quote from: Katfish on August 21, 2015 - 05:59:54 PM
    Slide the new gear in, paying attention to the clocking.  It's clearly marked on the housing.

    I haven't done it in years, but I remember having trouble figuring out the "clocking". The speedo gear housing is an off-center cam made to accommodate different width speedo gears. I use to put the gear in and rotate the housing trying to "feel" for the speedo gear engaging the tailshaft. I wrecked a couple of speedo gears that way by not having them fully engaged or having them "over"-engaged. Obviously I didn't know how to "clock" it properly. The "tick" marks on the housing - is there a definitive method for aligning them for a specific speedo gear? What is the proper technique for "clocking" those tick marks? :dunno:
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    Cheers!
    Tom
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    Former owner of 16 classic Mopars. "It is better to have owned (Mopars) and lost then to have never owned at all" (apologies to Alfred Lord Tennyson)

    Offline Strawdawg

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    Re: changing speedo gear in transmission
    « Reply #3 on: August 21, 2015 - 08:43:56 PM »
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    Offline Strawdawg

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    Re: changing speedo gear in transmission
    « Reply #4 on: August 21, 2015 - 08:46:25 PM »
    15th post in that thread

    Sent from my LG-H810 using Tapatalk

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    Offline RzeroB

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    Re: changing speedo gear in transmission
    « Reply #5 on: August 21, 2015 - 09:28:48 PM »
    Quote from: Strawdawg on August 21, 2015 - 08:46:25 PM
    15th post in that thread

    That's cool! I just didn't remember seeing the gear teeth number ranges on the speedo gear housing - must of been covered over in grime or something?? Thanks!
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    Cheers!
    Tom
    St Louis, MO

    Former owner of 16 classic Mopars. "It is better to have owned (Mopars) and lost then to have never owned at all" (apologies to Alfred Lord Tennyson)

    Offline 67vertman

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    Re: changing speedo gear in transmission
    « Reply #6 on: August 21, 2015 - 10:30:34 PM »
    Don't forget to drain some fluid out of the trans....or be ready to clean up a mess.
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    Ron - Born and raised in Southern California

    I got the 1970 Cuda, but still need the hot blonde to ride shotgun!

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    Offline wantone

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    Re: changing speedo gear in transmission
    « Reply #7 on: August 22, 2015 - 04:24:09 PM »
    I need a 33 tooth gear?
    235/60/15 radial ta's
    3:23 rear end
    Automatic.  Slap stick.   
    The pic of the bolts I remove is missing. 
    Ebay -   ... Just the gear and new o ring right?
    http://www.ebay.com/sch/sis.html?_nkw=SPEEDOMETER+PINION+GEARs+MOPAR+DODGE+PLYMOUTH+727+833+&_itemId=150360503273
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    (O O {]{]{]||[}[}[} O O)
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    Offline wantone

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    Re: changing speedo gear in transmission
    « Reply #8 on: August 22, 2015 - 04:25:19 PM »
     :useless:727 trans fyi
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    (O O {]{]{]||[}[}[} O O)
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    Offline Katfish

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    Re: changing speedo gear in transmission
    « Reply #9 on: August 22, 2015 - 05:21:44 PM »
    Be careful, there are long and short shaft gears, you need the long one.
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    Offline wantone

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    Re: changing speedo gear in transmission
    « Reply #10 on: August 22, 2015 - 05:55:22 PM »
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    (O O {]{]{]||[}[}[} O O)
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    Offline Katfish

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    Re: changing speedo gear in transmission
    « Reply #11 on: August 22, 2015 - 07:26:30 PM »
    Yes, that's it
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    Offline wantone

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    Re: changing speedo gear in transmission
    « Reply #12 on: August 22, 2015 - 11:27:58 PM »
     :bigsmile:I'm on this.  Thanks to all.  I'm going to figure this out.
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    (O O {]{]{]||[}[}[} O O)
    Want one?  Got one! ... finally
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