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  1. #1
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
    Posts
    240
    Country Flag: United States

    Damn it, did I screw up my new Ford 9" ?

    I have a new Ford 9" in my 69 Firebird with about 300 miles on it. I'm doing a T56 Magnum swap and part of that involved a new driveshaft with 1350 u-joints.

    To accommodate the 1350 u-joints, I bought this from Strange:

    https://www.strangeengineering.net/p...rome-moly.html

    https://www.strangeengineering.net/p...end-yokes.html

    and they sold me this spacer kit for the pinion yoke:

    https://www.strangeengineering.net/p...-or-n1917.html


    I needed to use an impact to remove the pinion yoke nut with someone holding the car brakes. No problem. Then I used a puller to get the old yoke off. No problem. I compared the new yoke to the old and they were identical in total length but I needed to use the thicker of the 2 spacers under the nut for it to be the same shallow depth as the original, no problem I think. Then I proceeded to use the impact again to crank down the nut and seat the pinion yoke.

    Problem is, I don't recall exactly how much of the threads was sticking out past the pinion nut originally and it seemed like there is maybe more now. I did some searching and it would appear that cranking down on that nut sets the pinion pre-load. DAMMIT! My dumb ass knows nothing about rear ends and didn't know that.

    So, am I screwed? Do I need to tow my car to a rear-end guy on a flatbed after my T56 swap to have my pinion depth/pre-load redone?

    This is a super bummer if I screwed it up.

    Thanks!
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

  2. #2
    Join Date
    Nov 2006
    Location
    Mountain Springs, Texas
    Posts
    3,059
    Country Flag: United States
    Pretty sure that needs to be redone if you used an impact driver on it.

    Don
    1969 Camaro - LSA 6L90E AME sub/IRS
    1957 Buick Caballero - huge project
    1959 El Camino - Ironworks frame
    1969 Mustang Sportsroof
    1956 Cameo - full C5 suspension/drivetrain

  3. #3
    Join Date
    Aug 2004
    Location
    NJ
    Posts
    1,024
    Country Flag: United States
    You can just pull the center section and bring it to him yourself.

  4. #4
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
    Posts
    240
    Country Flag: United States
    Ok. thanks. Is there a way to know for sure? Like it turns and feels just like it did before. Would it make a noise when driving?
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

  5. #5
    Join Date
    Aug 2004
    Location
    Texas
    Posts
    311
    Seems like the first thing you need to determine is if a crush sleeve or a crush sleeve eliminator kit was used to set pinion preload. Obviously the builder would know - and if they used the eliminator kit you are probably ok. Even though the kits are inexpensive and will mitigate the issue you may be having, most builders seem to use the crush sleeve. You can check the approx preload with an inch-pound torque wrench - on a new build most run 10-15 in-lbs I think. However, you will have the add'l drag of the axles (unless you pull them) and the engagement of the ring gear but it won't be much.
    -Bob (66 Nova)

  6. #6
    Join Date
    Jun 2010
    Location
    Deployed
    Posts
    2,920
    Country Flag: United States
    Quote Originally Posted by anguilla1980 View Post
    I have a new Ford 9" in my 69 Firebird with about 300 miles on it. I'm doing a T56 Magnum swap and part of that involved a new driveshaft with 1350 u-joints.

    To accommodate the 1350 u-joints, I bought this from Strange:

    https://www.strangeengineering.net/p...rome-moly.html

    https://www.strangeengineering.net/p...end-yokes.html

    and they sold me this spacer kit for the pinion yoke:

    https://www.strangeengineering.net/p...-or-n1917.html


    I needed to use an impact to remove the pinion yoke nut with someone holding the car brakes. No problem. Then I used a puller to get the old yoke off. No problem. I compared the new yoke to the old and they were identical in total length but I needed to use the thicker of the 2 spacers under the nut for it to be the same shallow depth as the original, no problem I think. Then I proceeded to use the impact again to crank down the nut and seat the pinion yoke.

    Problem is, I don't recall exactly how much of the threads was sticking out past the pinion nut originally and it seemed like there is maybe more now. I did some searching and it would appear that cranking down on that nut sets the pinion pre-load. DAMMIT! My dumb ass knows nothing about rear ends and didn't know that.

    So, am I screwed? Do I need to tow my car to a rear-end guy on a flatbed after my T56 swap to have my pinion depth/pre-load redone?

    This is a super bummer if I screwed it up.

    Thanks!

    Any reputable builder uses a solid spacer over a crush sleeve these days so odds are it has a solid spacer, but a question for the builder to verify. If it does have a crush sleeve, it all needs to come apart to be done right. Bearing preload is checked without resistance from the ring gear or axles. An easy way to check to see what you have done, is to rotate the pinion. If you crushed the sleeve more than it was, it will be tight. If it is tight and you drive it, you will smoke the pinion bearings in short time.

    Good thing is pulling a 3rd member is simple.
    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371

  7. #7
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
    Posts
    240
    Country Flag: United States
    Mine is not tight in the least, feels 100% as it did prior to swapping the yoke.



    I will call Quick Performance next week and verify they used a solid spacer.

    That would be great news, thanks for the info!!!
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.