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  2. General W-Body Discussion

    1. FAQs and Technical Information

      'How-To' articles and basic information for those who are new to the W-Body platform.

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    4. PCM Tuning

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    5. Brakes/Suspension/Steering/Wheels/Tires

      This is the place to talk about brakes, suspension, lowering, wheels, tires, basically everything that affects your car's ride and handling.

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  3. Specialty Forums

    1. Turbo Grand Prix

      This forum is for enthusiasts of the rare 1989-90 Pontiac Grand Prix Turbo.

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    2. Cutlass Supreme Convertible

      A forum for information and discussion about the Oldsmobile Cutlass Supreme Convertible

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  • Posts

    • mechanic58
      Looky I got!

      By mechanic58 · Posted

      You might be right. The GTP did have new axle assemblies in it when I got it. They don’t have 100 miles on them.
    • Bake82
      Looky I got!

      By Bake82 · Posted

      Interesting!  I think it's like that because I am pretty sure the GTP axle is an aftermarket. I bet if it was OEM it would work.    I bet if you hit a JY and pulled a GTP pass side axle and if it looked like the lumina one it would work no issues.  but if you can just click and buy one, that's easier!  
    • mechanic58
      Looky I got!

      By mechanic58 · Posted

      Here’s a pic of the two inner joints. These are the pass side inners, the Z34 4T60 inner is on the left, the GTP 4T65 HD is on the right. Although the 4T65 HD joint has a larger spline shaft, the Z34s inner has a larger od tulip.
    • mechanic58
      Looky I got!

      By mechanic58 · Posted

      I’ll post pics later. The 93 Z34 inner joints are way bigger than the gtp axles. Kinda odd. But the Z34 4T60 did have a 3.69 final, could be why.
    • Bake82
      Looky I got!

      By Bake82 · Posted

      Interesting because it worked for me.  92 GTP shaft and outer joint with the 03 GTP inner cup.   figured the Z34 would be the same as a 92 GTP.   But you are correct, the 98/99 lumina/monte carlo with 3.8 would work just fine.  The Drivers side would plug right in, and the passenger side a quick change of the inner tulip to fit the HD diff.    
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