66 GS Posi Rear Needed

Discussion in 'Parts wanted' started by 66kooch, Jul 25, 2018.

  1. 66kooch

    66kooch Well-Known Member

    Looking for a 1966 Lark GS Posi. Prefer the 3:55 or 3:36 Will consider 3:23 if that is all I can get.
    Thanks
     
  2. BrianTrick

    BrianTrick Brian Trick

    Are you only looking for the specific 66 8.2” 10-bolt,or would you consider a 71-72 8.5” 10-bolt?
     
  3. 66kooch

    66kooch Well-Known Member

    I prefer the 66, but will consider the 70's as long as the control arms are in the same place to accept the sway bar. I believe you stated on another site the 72 is a bit narrower than the 66?
     
  4. BrianTrick

    BrianTrick Brian Trick

    All of the mounting points and geometry are the same,so it is a direct bolt-in,as far as that is concerned. Some of the early 66 Buick’s came with the leftover narrower rears from 65,but the rest of 66,and all the way to 72,had the same width rear. The only real modification is when you convert from a BOP 8.2”,to an 8.5”,you will need to shorten your driveshaft 3/4”.
     
  5. 66kooch

    66kooch Well-Known Member

    OK Brian, thanks for the info. Will see if anyone ponies up on a 66 rear. Thanks,
     
  6. skybird300

    skybird300 Active Member

    I have a 67 gs400 to part out but I'll have to check the ratio, i think 3.42 was a popular ratio on this model if you're interested i can check it out. LMK. Thx.
     
  7. 66kooch

    66kooch Well-Known Member

    Yes interested, please check for being a posi and the ratio.

    Thanks,
     
  8. skybird300

    skybird300 Active Member

    Checked it today 3.08:1, Posi.Towed it 200 miles recently no play forward/backward pinion looks dry no noises while towing both wheels tracked straight and true. LMK or call 615-600-9663. Thx, allan Cleveland, TN.
     
  9. 66kooch

    66kooch Well-Known Member

    Allen, do you know if there is a width difference between 67 and 66 rears? I do not want anything wider than what the 66 is.
     
  10. GranSportSedan

    GranSportSedan professional irritator

    early 1966 cars got a narrower rear same as 1965, mid and late 66-1967 had a slightly wider rear end.
     
  11. telriv

    telriv Well-Known Member

    Your ONLY talking about a 1/2" each side.
     
    GranSportSedan likes this.
  12. GranSportSedan

    GranSportSedan professional irritator

    Exactly why I opted for a 71-72 8.5 rear for my 66
     
  13. 66kooch

    66kooch Well-Known Member

    Because it is narrower?
     
  14. 66kooch

    66kooch Well-Known Member

    I had 8" wide rims that I tried to put on one of my larks, and I needed the extra 1/2' on each side to allow them to fit.
     
    GranSportSedan likes this.
  15. GranSportSedan

    GranSportSedan professional irritator

    I have 8 inch wide rims but I had the extra inch put to the inside and they fit just fine. I could see where you would have fitment issues if the extra interest to the outside
     

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