1970 Z28

Discussion in '1970 - 1973 Specific' started by clm69z28, Mar 5, 2012.

  1. clm69z28

    clm69z28 Member

    Oct 29, 2011
    encinitas ca

    Yeah, just down the road. I am sure that we have crossed paths somewhere-maybe Escondido cruise night? I'd love to see your 70 Z sometime. I have been looking for one for a while but finding a good unmolested one is tough. I have a 69Z but would love to have a second gen too.
  2. flowjoe

    flowjoe Moderator Staff Member Lifetime Gold Member

    Feb 7, 2006
    LOL - my '70 is in pieces. I did Escondido once years ago. It depressed me to see whole lots full of PT losers. The actual cruising was not happening so walking around was the only option and there was no where to park our car nearby (in part because of the PT losers). We don't ever go.
  3. twozs

    twozs Veteran Member

    Aug 5, 1999
    hopewell jct ny
    well you had to chose from 1 of the 4 trans options ( auto included ) . you couldn't get a rear ratio lower than a 373 in a 70 Z28 so im not realy sure what you mean by that . the m20 373 could even be had in 73 and 4 ( as long as you didn't have A/C ) the m20 342 was a forced A/C rear on the z in 73 and 4 . i thought there were members on the site with a M20 70 z . i mean all the literature states 4 speed manual or auto . are you familiar with the gm heritage site ? i mean , it looks legit and it states the m20 could be had in the 1970 z28 even with a optional 4.10 gear. i cant copy the page as it copy written or my java script wouldn't let me . here is a link to the site , its easy to follow . http://gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html . not trying to be a PITA , but i thought you could get a M20 on a 70 - 73 Z28 ??? i cant see any reason why not . and there was no forced or standard trans for an year Z , except in 73 when you ordered A/C it forced the M20 342 combo
    Last edited: Mar 6, 2012
  4. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
    My 70 Z28 is a M20 car with GM Canada paperwork.
  5. Doug G

    Doug G Veteran Member

    Nov 27, 1999
    Talking Rock, Ga.
    You could get a 4.10 ratio from the factory. It was the only optional rear available for 1970. All the others ratios could be ordered through the parts Dept., but would have to be dealer installed.
  6. Hatzman

    Hatzman Veteran Member Lifetime Gold Member

    That last photo, with the older gentleman in the picture, is the one that would scare me the most. Notice how the car is sitting, up high in the front? Looks like the engine is out...

    Just saying!
  7. flowjoe

    flowjoe Moderator Staff Member Lifetime Gold Member

    Feb 7, 2006
    I totally missed this response sorry...not trying to be a PITA? Then what's the signature for? - LOL:crazy:;)

    No foolin' I get the gist of your comments and why. I am working from memory on this so will have to dig around to see if I can find the root for this memory - or not;). I am familiar with the GM Heritage site but had not specifically looked up transmissions on it. In 1st gen Z's the default rear gear is 3.73 and the M-21 is mated to that axle - I'm pretty sure no substitutions. Being that it was the option crazy '60s one could order any other gear with Z/28 but the tranny changed accordingly. IIRC 3.73 and up meant M-21 below 3.73 meant M-20 - now I jus:Dt have to recall where I read that
    Last edited: Aug 13, 2012

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