im new to this forum and i got a couple of questions
1. i have a 83 rx7 and yesterday i did some burnouts and donuts but thing is that only one wheel spins at a time.
2.can i put a Diff from the 91 rx7 and wich rx7 from that year comes "posi"
i want to burnout both of my tires at the same time.!!
thanks.

 

1. Yup you got open gears.
2. Not easily. The easy swap is to put the entire rear axle from a GSL or GSL-SE. The -SE has a different bolt pattern on the wheels, both have limited-slip differentials ('posi') and rear disc brakes.

 

so if i got open gears what does that mean?
plus what year is the GSL or the GSL-SE?

 

It means you dont have a posi rear.
The GSL or GSL-SE have posi's. They were made 83-85.

 

81-85 I have an 81 GSL with rear disks and LSD

 

Thanks for the correction. My mind isint what it used to be.

 

so bassically gettting the rear diff from an 81-85 GSL would bolt on easily with no mods?

 

Yes, but I don't remember if it was 83 or 84 that they switched to a larger axle. Can someone elaborate on that pease.

 

in 84 they switched to a stronger bigger axle. the easiest way to know if it is a lsd is it should have rear disc brakes and not drums. even though people have just changed the pumpkins befor, but not likely. they are great to have and not so hard to find. but they might cost you a bit. or you can do the old fashioned welded posi trick. wouldn't suggest it though. good luck on finding one.

 

what is the old fashion weld trick?
and is it hard to do?

 

you drop the 3rd member and weld the spider gears together basically turning it into a solid spool. this really isnt a good idea on a street car. keep in mind that the driveshaft changed in 83 when your picking out a diff.