Spotted this Sports Option diff cooler and pump. Thought it would be interesting for some. @HS30-H can you say anymore, pump under rear floor mounted, bolt holes already exist? The auction listed it for the Fairlady Z.

 

Oh some of those photos didn't work well...

 

I cannot comment on that setup, but most guys stateside who actually do run a diff pump setup will use something like this with a small mocal or setrab cooler, similar in size to yours pictured. :
https://www.pegasusautoracing.com/productdetails.asp?RecID=156

Depending on HP, etc, differential temps are a legitimate concern, even during 1/2 hour sessions.  My memory is a bit hazy but I was seeing temps above 250 degrees prior to the pump.

On 12/16/2024 at 1:23 PM, RIP260Z said:

Spotted this Sports Option diff cooler and pump. Thought it would be interesting for some. @HS30-H can you say anymore, pump under rear floor mounted, bolt holes already exist? The auction listed it for the Fairlady Z.

Hi Ian. Sorry, missed your post first time round.

It looks very similar to the diff cooler kit fitted to some of the later UK & 'Euro' market cars (for expected Autobahn speeds I guess). I've got a couple of the same pumps as NOS parts and I believe they continued well on into Z31 period. Used on other models too.

Factory Works rally cars used a similar pump in '73, hidden/safe in one of the tool compartments: