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  1. #1
    Authorized Vendor SPeace-ATL's Avatar
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    Default T-5 Internet Myth: The T-5 main case is weak and can split.

    People say the T-5 case is weak and can split.

    I want to see a picture of a T-5 case somewhere that split from over-powering it, and I want to know how much power it took to do it! The only broken T-5 cases I've seen have been from outside stresses and impacts.

    The actual weakness of the T-5 case is in that the rear countershaft bearing race is only supported by the thin aluminum rear wall of the main case.

    Under racing conditions, this race spins in the case and wallows out the bore for the race.

    Some years ago, Paul, at 5speeds.com wanted to solve this issue on the T-5s that he was racing and came up with the billet steel plate. If you notice, that race sticks out the rear of the case just a bit and the counter gear support plate "cups" over the rear of the race. If the race spins, it will then be steel against steel and it won't wallow out so quickly.

    These plates have been copied by many people. Be sure that the plate is no thicker than 0.50 inches, or it may rub the face of the fifth gear... Paul laughs at people that make them out of aluminum, saying that they will wear out just as quickly as the stock bore.
    Last edited by SPeace-ATL; 08-07-2011 at 04:52 PM.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  2. #2
    Authorized Vendor FoxBodyRacing's Avatar
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    Default

    Quote Originally Posted by SPeace-ATL View Post
    Paul laughs at people that make them out of aluminum, saying that they will wear out just as quickly as the stock bore.
    i think if they are made from a regular grade aluminum that would be correct. i had mine made from t6 aircraft grade billit aluminum and after 2 years of use and many low 11 second passes on slicks. pulled it apart it still had just as much preload as the day i put it together.
    Last edited by FoxBodyRacing; 02-15-2012 at 09:37 PM.

  3. #3
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by FoxBodyRacing View Post
    i think if they are made from a regular grade aluminum that would be correct. i had mine made from t6 aircraft grade billit aluminum and after 2 years of use and many low 11 second passes on slicks. pulled it apart it still had just as much preload as the day i put it together.
    That is probably true. A good grade aluminum one should hold up.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  4. #4
    Authorized Vendor SPeace-ATL's Avatar
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    I have encountered a few who have said they have seen a T5 case that split because the gears stripped out and the teeth hit end-to-end and the case just had to split. This would only be with the

    In that case, there is something to be said about having a stronger case in hopes that it wouldn't spill guts onto the roadway (or the track)...

    As far as getting the stronger case to PREVENT the blow-up would be pointless because the gears blow-up first and THEN the case splits.

    In my opinion, replacement cases are relatively cheap.
    If one is in an all-out racing situation with the full 650 HP and it is important that the transmission not spill out onto the track when it blows, then that would be a good reason to invest the money in the stronger main case.

    But again, the case doesn't cause the transmission to blow, it is the gears shattering with no place to go!
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  5. #5
    Formerly ABCSTYERS Craig's Avatar
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    Default

    I didn't crack one... but I did send a gear thru the side of the case... I'll dig up the picture and post it up




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  6. #6
    Authorized Vendor SPeace-ATL's Avatar
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    Quote Originally Posted by Craig View Post
    I didn't crack one... but I did send a gear thru the side of the case... I'll dig up the picture and post it up
    A gear? WOW! I'd love to see it. Do you know which gear it was?

    My point in calling this an internet myth is that people think they need the stronger case to prevent the gears from blowing up. I'm saying the case is plenty strong to not cause a blow-up, but once the gears themselves grenade, the case may well break in the process. There is no need to spend the money for the stronger case unless one is considering it to be more like a scatter shield...
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  7. #7
    Formerly ABCSTYERS Craig's Avatar
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    Attachment 12265

    Not sure what gear that is, but I'm sure you can tell




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  8. #8
    Authorized Vendor SPeace-ATL's Avatar
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    Aaah!

    Ok, I must admit I've not seen one do that!

    In this case it didn't actually grenade and split the case.

    What happened was that the front counter shaft bearing failed and the counter gear had no front support. There is little clearance between that gear and the side of the case, so the hard steel teeth "sawed" right through the case! I've seen some that have rubbed a bit, but never anything like this!

    That gear isn't classified as any one in particular as it is the main input drive. It is used to transfer power for all gears except for fourth, which bypasses it and goes straight through.

    Very interesting!
    Thanks for sharing.
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  9. #9
    Formerly ABCSTYERS Craig's Avatar
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    I was proud.




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  10. #10
    Authorized Vendor SPeace-ATL's Avatar
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    Definitely a conversation piece!
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

  11. #11
    Authorized Vendor FoxBodyRacing's Avatar
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    i have also seen that. i gaurentee the bearing failed due to low fluid. like ATL said low fluid will kill the transmission. also using gear oil in a WC transmission will kill it.

  12. #12
    Authorized Vendor SPeace-ATL's Avatar
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    I'm rebuilding a T5Z this week that ran low on fluid...
    The input shaft bearings all failed and the input gear "sawed" through the side of the front bearing retainer and ovaled out the input bore!

    Aluminum shavings EVERYWHERE!

    I've had them come in with the input shaft WELDED to the output shaft.
    I couldn't even disassemble it. Had to just chunk it!

    A couple weeks ago I had one that the first gear bearing melted down and it WELDED first gear to the output shaft!

    Ever drain the fluid from a TR3650 only to have what looks like silver paint come out of it? This happens if you keep driving after breaking a shift fork. The gears grind the chunks of aluminum up into a fine paste that looks just like paint!
    - Stan -


    Mustang 5-Speed Specialists - Authorized Distributor for Astro Performance products!
    Offering quality rebuilt T-5, T-45, and TR3650 transmissions in Atlanta

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