1970 Z28 Leaf Spring questions

Discussion in 'Original Drivetrain Topic' started by 70lt1z28, Mar 26, 2017.

  1. TommyRS70

    TommyRS70 Veteran Member

    Jan 31, 2004
    Here's a couple from an NOS Gm set I have. Not sure when they were made. See next...
    Last edited: Sep 5, 2017
  2. TommyRS70

    TommyRS70 Veteran Member

    Jan 31, 2004
    Here's a NOS GM set...not sure of production date. 0903172114.jpg 0903172113.jpg
  3. flowjoe

    flowjoe Moderator Staff Member Lifetime Gold Member

    Feb 7, 2006
    Figured this was worthy of being stickied... see under "Various Original Drivetrain Stickies".
    Last edited: Sep 10, 2017
  4. l16pilot

    l16pilot Veteran Member Lifetime Gold Member

    Dec 13, 2004
    Hurlock, MD, USA
    Hi Joe!....been a while bud. hope you, Karen and the girls are well. :)
  5. flowjoe

    flowjoe Moderator Staff Member Lifetime Gold Member

    Feb 7, 2006
    We're all good Steve, thanks for asking. Hope you guys are doing well also. :bowtie:

    PS I still have a pair of doors sitting here with your name on them.
  6. CamarosRus

    CamarosRus Veteran Member

    I'm obsessed with coming to a CONCLUSION on what mfg (not any ole dealer)
    can mfg the closest best fit best look 70 Z28 AND 70 L-78 rear leaf spring
    WITHOUT all this re-arching baloney

    Steve....I bought 21-297 springs from DAYTON (via www.SDtruckSprings.com)
    to replace the springs in my 73 R/S LT (L65, T350)
    The 21-297 is the spring that replaces the factory # 480879

    Member JBloake wrote else where that he found the 21-285 to same as
    3930074 ....70 Z28 spring ??????
    Anyway my contact at DAYTON spring says he can make a very close
    21-287 but currently has NO inventory

    I'm trying to pull together all previous postings but not doing a good job...
    Did anyone ever post anything accurately on the 70 L78 rear spring
    or what did Scott K and Mike S buy from EATON
    Last edited: Mar 6, 2018
  7. Budz

    Budz Veteran Member Lifetime Gold Member

    Mar 17, 2002
    Ashburn, Va USA
    FWIW....I used the Eaton Z/28 leaf springs, but never had them modified in any way. I've never touched the front coil springs though and have had the car 20 years....I'm pretty sure they're the original 48 year old coils.

    I think my cars slightly 'nose down' look is due to the front coils, not the rear leafs, and I believe Eatons springs are correct without de-arching. Check out the vintage Z/28 dealership photos below for comparison. They show a lot more clearance both front and rear above the tires than are on most of our restored Camaros.

    Note: My car has over-sized tires in these pics, but tire size doesn't matter for the purpose of spring stance. The tires are the same size on all four corners.

    May 2016 3 LARGE.PNG
    May 2016 4 LARGE.PNG

    How they looked when new
    1 LARGE1971 Z28.PNG

    Last edited: Mar 1, 2018
  8. Ricks72Z28

    Ricks72Z28 Veteran Member Lifetime Gold Member

    Jan 1, 2005

    The problem was so bad that you could not hook up the brake line from the diff to body...That why the searching was necessary.
  9. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    Mar 24, 2001
    Rockledge, Florida
    OK, today I took some time and found my original (02C-Norwood) springs. Took some pics of them. They are on my photosite. You can look through them and if you want wicked detail, use the link at the bottom of the page. It is ginormous!

    My Gallery

    Huh. The rubber in the spring mount is:
    GENERAL TIRE B15153 5F-45 3892753
    Last edited: Mar 5, 2018
  10. CamarosRus

    CamarosRus Veteran Member

    FlaJunkie, I also have ORIGINAL 70 Z28 springs that I bought from a local wrecked Z28
    about 25 years ago.

    What we need is to be able to compare what the Aftermarket is offering US
    compared to the GM originals

    I have the aftermarket SRI #'s that match the OE numbers

    For reasons I cant explain DAYTON spring doesnt mfg the 21-285 which crosses
    to the 3930074 2nd design 1970 Z28

    DAYTON does mfg the 21-345 which crosses to a service replacement 480881

    No one I know of is willing to buy this 21-345 from www.sdtrucksprings.com
    and see if/how it fits their 70,71,72,73 Z28 !!!!!!!!!!!!!!

    I still need to discuss/call EATON and DAYTON with the above info and come to my final conclusions.
    Last edited: Mar 5, 2018

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