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Thread: Seals

  1. #1

    Question Seals

    Hey guys,

    I have to machine down a drive shaft yoke, but i do not know how much i should leave on it so the seal will have the proper contact pressure on the newly machined yoke. Any suggestions would be appreciated.

    Rob

  2. #2
    Join Date
    Feb 2002
    Posts
    783

    Post

    Is there a sleeve available from your local auto parts store or is it not appropriate in this application?

  3. #3

    Post

    The yoke is too big. I have to machine it down so it will fit in the tail end of the transmission. My buddy is installing a Tremec 5 speed in his 66 Malibu.

    Finding the correct yoke has been like pulling teeth. He has two purchsases that have not panned out, and he is someone who realy reaserches something before he buys it.

    Rob

  4. #4
    Join Date
    Dec 2003
    Location
    Regina and Assiniboia, Saskatchewan
    Posts
    5,950

    Post

    Rob, that's funny! I just had a guy at work ask me about putting a newer 5 speed into his 67 Olds. I claimed ignorance of course because I've never done one.
    If yolks are that hard to find then what the heck is the tranny out of? I've built a lot of wierd things over the years and have found that there is often a conversion U-joint made. Is this a possibility here?
    Right now I'm doing a Toyota 4x4/4.3 Chevy swap. Conversion joints are available for this. I'm thinking that older Chev and new 5 speed trannies is a common swap.
    Ha....now I can tell the guy at work that "I'm all over it"
    Russ
    I have tools I don't even know I own...

  5. #5
    Join Date
    Jan 2003
    Location
    On the Oil Coast,USA
    Posts
    16,871

    Post

    Well measure the seal's(new one)ID.It should be close to something either SAE or metric,then turn to that size.

    I just need one more tool,just one!

  6. #6
    Join Date
    Sep 2004
    Posts
    2,986

    Post

    Up here in canada we make some nice hats from the seals we club. Slippers also.

  7. #7
    Join Date
    Mar 2005
    Location
    San Antonio, Texas
    Posts
    86

    Post

    If you can find a good auto parts store (NAPA or and old Mom & Pop place), they should have a specification book for seals. It will have the intended shaft size for any part number. An industrial bearing supplier should have the info as well.

    Kerry

  8. #8

    Post

    Hey everyone,

    I can get the seal. No problem. I have the part number and all the info. I would like to know what is an acceptable friction fit.

    Example. If the seal measure 2.000" should the yoke have an outer measurement of 2.001" or 2.002"

    Russ:
    My buddy has a 66 chevelle with a 454 500hp motor. His is installing a new tremec 5 speed. Of course these don't come with the yokes. His automatic yoke is too big to fit in. The one i want to machine down.

    He did buy one off of Ebay but the iner splines don't seem to be cut the same. Their inner dimesion is too small for the output shaft in the transmission

    Rob

  9. #9
    Join Date
    Mar 2001
    Posts
    171

    Post

    If wou know the seal # then simply look up what size shaft it is designed for.

    Most transmissions also have a bushing in the tailhousing so that is what I would worry about.

    Rob

  10. #10
    Join Date
    Jan 2003
    Location
    Deep in the Heart of Texas!
    Posts
    5,716

    Post

    Yep, finding the right yoke is a common problem. They're diffent lengths, OD's and splines. Just because it's a GM doesn't mean a GM yoke will fit. There's different models of Tremec's; Which model is it?

    Seals are sold/designed to fit a given shaft size depending on the seal type and application. If you have a 2" shaft, you buy a 2" seal. The ID of seal may actually be 1.980 when measured without compression. The clearance varies by type of seal (K, L, C, etc.) and the pressure applied to the contact area.

    I'd start out a little large like .030-.040" oversize. Oil the shaft/seal and try it. It should be snug without causing the seal to roll on in/out movement. Just make sure the seal contact area is polished smooth. If it's too tight, take off .005, polish and try again.

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