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I have a 75 280Z and just spent 1 1/2 hours trying to remove the four bolts where the driveshaft connects to the differential. I had no luck because leverage and space was a problem. I don't remember this problem on my 74 260Z or 71 240Z. If I remember right on those two cars all I needed was two wrenches and off them came. Looking at the driveshaft it appears that the bolt head is prevented from turning by one flat of the bolt engaging a flat spot on the driveshaft flange. I sprayed rust lubricant and heated the nut side but my wrench started to round out the nut. The only other idea I could come up with was drilling through the bolt head side to weaken it and knocking it off with a chisel. I'm not worried about saving the hardware but I'm in a time crunch because I need to pull my engine/xmsn. In it's place will go a chevy 327/muncie 4 speed. Any other ideas anyone?
 

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> I have a 75 280Z and just spent 1 1/2 hours
> trying to remove the four bolts where the
> driveshaft connects to the differential. I
> had no luck because leverage and space was a
> problem. I don't remember this problem on my
> 74 260Z or 71 240Z. If I remember right on
> those two cars all I needed was two wrenches
> and off them came. Looking at the driveshaft
> it appears that the bolt head is prevented
> from turning by one flat of the bolt
> engaging a flat spot on the driveshaft
> flange. I sprayed rust lubricant and heated
> the nut side but my wrench started to round
> out the nut. The only other idea I could
> come up with was drilling through the bolt
> head side to weaken it and knocking it off
> with a chisel. I'm not worried about saving
> the hardware but I'm in a time crunch
> because I need to pull my engine/xmsn. In
> it's place will go a chevy 327/muncie 4
> speed. Any other ideas anyone?
If you haven't already, remove the weight on the front of the diff, as to have better access. Put your Snap On, or equivalent wrench on the nut, and turn the driveline with a small prybar. There isn't a lot of room to turn the wrench, so I turn the driveline. Joe
 
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