Howdy all,

I have a few questions regarding 2nd gen (FC) rx-7 differentials.

I'm working on a project miata in which we were using the n/a, 7'' LSD off of an 87 convertible.

At some point, the pinion gear seized inside the housing and I/we did not have the tools to free the gear from the housing. I took it to a shop who claimed they would be able to separate the parts. Unfortunately they lied, and stole my parts.

I still have the hubs, axles, and DS I was using prior, I also have an open 7'' diff with axles.

Given the above information, my question is which model differential should I be trying to find in order to use the same axles and DS again? I know it's one of the n/a, 7'' models, but after some quick reading in here I see that there are a few different trim levels with different kit and I have no idea which is which.

Any input is appreciated, thanks for reading!

 

im sorry for your loss. but it think that you can use pretty much any NA differential whether its an Open or clutch type series 4 86-88, the series 5 i know are alil diffent with the half shafts iirc

 

Awesome, thank you!

 

Just to expand on Midnightbluefc's input, the only NA differential you can't use i the S5 GTUs differential.

Also, some shopping advice for your next differential. Convertibles came with a 3.90 open diff. Almost all others are 4.10 open or LSD. The rare exception being the S5 GTUs 4.30 that fits differently.
Dealer options and services along with a string of previous owners doesn't guarantee what is currently on the car, so you're just going to have to check out the parts yourself.