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*SEARCHED* Question about swapping Diffs


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OK, I just want to be clear I looked around already, but I've found a lot of conflicting information on the subject.

 

I want to swap the R200 open diff on my 280z for the CLSD from the 88 Z31. I already have the new diff, but I haven't gotten a chance to try and install it yet.

 

So far I've gathered that this is a bolt on swap and the ONLY thing I have to do is swap the driveshaft companion flange.

 

Now, Some people say that I need to take off the finned cover and put my old non-finned cover on. I'd like to retain the finned cover so my diff won't overheat. Is there a bolt-on friendly (read: no welding) way of doing  this? z31 mustache bar or something? Is this even a real problem?

 

Thanks guys.

Edited by osirus9
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oh man, I love this forum! I'm ordering a brace from Burleigh right now. I suppose I don't NEED it, but I like the idea of keeping the finned cover, and I don't want to open up the diff to swap.

 

I suppose I'll figure out the ring gear bolt situation when I get to taking out the diff, which should hopefully be some time this week. It looks like the diff in my car was messed with, so I have no way of knowing if it's from my 78 or was swapped in at some point. I also don't know the year the lsd was made, just the model so I'll just have to wait and see. I'm thinking adapter bolts will work instead of drilling?

 

and I DO need to swap companion flanges correct? Is there a special tool I need to do that, like a puller or something?

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