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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » T-5 Blues

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    2/01/2016 10:49 AM  #1

    Trotb4UGallop
    FYI FORD Member

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    Registered: 2/25/2015
    Posts: 31

    T-5 Blues

    Happy Monday everybody,  anyhow upon recent inspection of my 88 GT the trans numbers according to my friend that looked at them turned out to be 4cyl. trans numbers which surprises me because although I've only taken it to the track once I've been pretty hard on it aside from just powerbraking it bc I really don't have to and it's far from stock.

      Anyhow my wonder is how the pilot bearing is able to hold up if it's possibly too big for the input shaft?  I've replaced it twice with the v8 T5 one but not out of necessity.  I haven't noticed any exceesive vibrations or wear marks either.  I didn't know if this is normal or if possibly the input shaft could have been changed.  I just drove it today, I noticed smooth shifts with no vibrations and I stomped on it a little harder out of a slight amount of disappointment.  I've had the car for nearly 9 yrs now and have only had it in a shop to refresh the rear end and I know it has the same trans before and after this visit.

    Thanks in advance my fellow Stangers!

     

    2/01/2016 11:40 AM  #2

    wsinsle
    Senior 24-7 FYI Addict

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    From: Belle Vernon, PA
    Registered: 4/01/2013
    Posts: 1,730

    Re: T-5 Blues

    You could measure the input shaft to see if it is a 4 cylinder input. (4 banger .590 /// V-8 = .670) They sell pilot bearings on e-bay for 4 cylinder T-5 in a V-8 car. If'in I remember, 84 Ranger Diesel Pilot will work.

    If this forum can't fix it, it isn't broke.
     

    2/01/2016 1:28 PM  #3

    josh-kebob
    Senior 24-7 FYI Addict

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    From: Madison, AL
    Registered: 4/06/2013
    Posts: 2,902

    Re: T-5 Blues

    Contact Glen at rosehillperformanceparts.com

    Glen has a PhD in T-5 trans and is a member of this forum.
    He has rebuilt two T-5’s for me and knows his stuff.

    Give him a call and he’ll help you......

     

    2/01/2016 1:47 PM  #4

    Trotb4UGallop
    FYI FORD Member

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    Registered: 2/25/2015
    Posts: 31

    Re: T-5 Blues

    Thanks guys,  I really don't want to pull anything again till I have to but some info would be nice as I never did test fit the pilot onto the input shaft prior to the install

       •Thread Starter
     

    2/01/2016 2:12 PM  #5

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,345

    Re: T-5 Blues

    I would hazard a guess that your input shaft has been changed out to a V8 shaft.  I don't see how it could operate smoothly if not.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    2/04/2016 12:41 PM  #6

    Glens 1965 50
    FYI Addict

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    From: Tomball,Tx
    Registered: 4/01/2013
    Posts: 278

    Re: T-5 Blues

    The 4 cyl T5 has a 3.97 first gear and the V8 are 3.35.  The inputs are not interchangeable due to tooth count and pitch. Getting the conversion bearing will be the best band aid here so you do not wear the input shaft bearing.  Right now it may be in good shape but it is taking a pounding and will eventually fail.  I am surprised it is not having a vibration issue. Let us know what you do.

     

    2/04/2016 1:48 PM  #7

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,599

    Re: T-5 Blues

    The input shaft and the 1st gear ratio have nothing to do with one another.  The input shaft is 4th gear, 1st gear is the gear farthest rearward in the trans main case (5th is in the tailshaft housing).  But, that being said, the cluster gears for a 4 cylinder and V8 T5 are different, and thus the input shafts are also different.  The input shaft and cluster have different tooth counts (34 for V8 and 33 for 4 cylinder on the cluster) and will not mate between a V8 and a 4 cylinder.  Now, you could swap the 4 cylinder gearset with a V8 gearset.  You can actually buy the whole Z spec set for like $450, which will be 1st-4th (input, cluster, and all speed gears).  Keep in mind this only works if your 4 cylinder T5 is a WC.  I've built a lot of Z-spec boxes over the years, even some for GM applications where I simply substituted a GM V8 input shaft. 

     

    2/04/2016 2:57 PM  #8

    Chaplin
    Senior 24-7 FYI Addict

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    Registered: 3/14/2015
    Posts: 1,027

    Re: T-5 Blues

    Nine years and no problems?  Classic case of if it ain't broke, don't fix it!

     

    2/04/2016 7:27 PM  #9

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,599

    Re: T-5 Blues

    Or, if it ain't broke yet; it'll cost you a fortune when it finally does. 

     

     

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