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1971 skylark - wanting 3.55 posi

Discussion in 'Got gears?' started by jr_, Mar 13, 2023.

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  1. V6sleeper

    V6sleeper Well-Known Member

    If you have the right 2004r builder like Husek or Janis the 2004r is a fantastic trans, i run 800 lb/TQ behind one in a heavy Turbo Buick.
    Only a hand full can build it right.
     
    V6sleeper, Mar 13, 2023
    #21
    Mark Demko, Dano and jr_ like this.
  2. jr_

    jr_ Well-Known Member

    I have rebuilt the suspension all the way around. Everything blasted and powder coated. New control arm bushings, shocks and springs and links. No rear swaybar. It’s lowered 1.5 inches (I liked the sag look of those tired springs) With qa1 shocks. It rides really well.
     
    jr_, Mar 13, 2023
    #22
    Dano likes this.
  3. 2.5

    2.5 Platinum Level Contributor

    I have over 600 on mine with a lock up on a switch. The car runs 11.40s at full weight. To be fair it has only been to the track twice just to get a number.
    If I thought I could have used the 4l80 without tunnel mods I probably would have butwas told i couldn so i didn' even try.
     
    2.5, Mar 13, 2023
    #23
    V6sleeper and jr_ like this.
  4. Dano

    Dano Platinum Level Contributor

    Yup. Snowballs are easy to make:). Also much easier to get to the fuel tank rubber lines w/the rear out & replace the brake line while doing the body mounts.
     
    Dano, Mar 14, 2023
    #24
    jr_ likes this.
  5. BrianTrick

    BrianTrick Brian Trick

    2.5
    One of these might be could be. Yours was intended for the next batch,but I haven’t heard from on of the people that I set one of these aside for. I did weld tabs on it for disc brake hose brackets,but you can still run drum brakes and all the stock stuff without them being in the way.
     

    Attached Files:

    BrianTrick, Mar 14, 2023
    #25
    V6sleeper and Dano like this.
  6. jr_

    jr_ Well-Known Member

    Any recommendations on a good body mount kit?
     
    jr_, Mar 19, 2023
    #26
  7. BrianTrick

    BrianTrick Brian Trick

    I prefer to run urethane body mounts,but someone people think it makes for a harsher/noisier ride. But hey,it’s better than solid steel.
     
    BrianTrick, Mar 19, 2023
    #27
  8. BrianTrick

    BrianTrick Brian Trick

    Here you go. 71-72 8.5” 10-bolt with Motive 3:42’s,Tru Trac unit,Timken bearings/seals,powder-coated housing,urethane bushings.
     

    Attached Files:

    BrianTrick, Apr 30, 2023
    #28
    jr_, Mark Demko, V6sleeper and 1 other person like this.
  9. jr_

    jr_ Well-Known Member

    Sweet! Can’t wait to get that installed!
     
    jr_, Apr 30, 2023
    #29
  10. Mark Demko

    Mark Demko Well-Known Member

    3.42 is a nice gear
    3.55 reminds me of a Ford gear:p
     
    Mark Demko, May 1, 2023
    #30
  11. jr_

    jr_ Well-Known Member

    BrianTrick built me a 8.5 with 3.42. Will be swapping the rear, engine(350 to 455) and trans (TH350 to 200-4r)during Fourth of July weekend.

    Any recommendations for U joints? Spicer part numbers? I am trying to use factory driveshaft.
     
    jr_, Jun 5, 2023
    #31
  12. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    It's a 3R u joint,

    https://www.amazon.com/Dana-Spicer-5-3147X-GM-U-Joint/dp/B009X1X7M0
     
    LARRY70GS, Jun 5, 2023
    #32
    jr_ likes this.
  13. monzaz

    monzaz Jim

    If the shaft is a 2 piece tube...Dump it for a one piece with out Rubber dampener ...Solid steel from another car or small truck or have one made.
    You will save yourself a headache. Unless this is a trailer queen.
    Jim
    JD Race
     
    monzaz, Jun 6, 2023
    #33
  14. jr_

    jr_ Well-Known Member

    It is not a two piece, thankfully.
     
    jr_, Jun 6, 2023
    #34
  15. monzaz

    monzaz Jim

    sOME PEOPLE GET FOOLED AS IT looks LIKE ONE PIECE BUT TOwards the back 1/4 of the tube it is literally a tube inside of a tube. straight with rubber holding one to the other inside the tube.
    Good luck, Jim
     
    monzaz, Jun 7, 2023
    #35
  16. 12lives

    12lives Control the controllable, let the rest go

    If you haven't done the mounts yet - see Todd. He had the best kit.
     
    12lives, Jun 7, 2023
    #36
  17. jr_

    jr_ Well-Known Member

    Thanks. I ordered a kit from stage one…
     
    jr_, Jun 7, 2023
    #37
  18. jr_

    jr_ Well-Known Member

    Will a TH350 transmission mount work with the 200 4r?
     
    jr_, Jun 7, 2023
    #38
  19. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    https://www.v8buick.com/index.php?threads/th350-200r4-swap-summary.176591/

    Quote from above link,

    "Trans mount & Crossmember -
    The TH350 trans mount can be used on the 200R4, although the 200R4 will require a spacer between the trans and the mount to correct your driveshaft angle. I just used longer mount bolts with an extra nut or two between the trans and the mount. If you do not get this right, you will have driveline vibrations. My body mounts are sagging/worn so I could fit only .33-.5 of spacer before the forward driveshaft Ujoint would contact the tunnelhump."
     
    LARRY70GS, Jun 7, 2023
    #39
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