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mechanic58
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1 hour ago, mechanic58 said:

Actually no, not that simple. The first generation Lumina Z34 had a special axle. The inner CV joint is not retrofittable with the 4T65 style axles. I have to get a set of second generation Lumina axles for a 4T65 and then swap one of the inner joints.

trust me, I already have this sorted out. I just haven’t bought the parts yet.

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.  

 

Edited by Bake82
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18 minutes ago, Bake82 said:

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.  

 

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.

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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.

005-FDADF-537-A-4248-8000-1895-FA6-EF9-C

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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!  

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On 11/27/2021 at 11:28 PM, mechanic58 said:

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.

that's probably why!  Not surprised.  I've seen in the Fiero world of L67 swaps they run into the same issue with OEM axles vs aftermarket axles and mixing and matching to make the right length. 

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