All manual transmissions are the same length, so hence all manual driveshafts for two seat cars are also the same length.

Transmissions each have their own unique slip-yoke on the driveshaft, and length for their application:

• 84-89 Automatic (2 seater)
• 84-89 NA manual (2 seater)
• 84-86 Turbo manual (2 seater)
• 87-89 Turbo manual (2 seater)
• 84-89 Automatic, 2+2
• 84-89 NA Manual, 2+2

In addition, the joints are not the same size in the N/A and turbo (at least manual) shafts; turbos are bigger so you cannot simply swap yokes or diff flanges on the shaft. On a side note I have only seen replacement-type joints listed for the turbo driveshaft's joint sizes, not the NA. It's easy to see from this information that if you want to put a turbo manual transmission in a 2+2 car, you will need to have a standard turbo driveshaft lengthened (re-tubed) or a custom unit made

There are two diff flanges:
84-86 - 38210-Y0800 - rectangular bolt pattern
87-89 - 38210-10V00 - square bolt pattern

You can swap the differential companion flange on the diff relatively easily with a steering wheel puller. Be sure to re-torque the pinion nut after swapping the flange!

Overall length for 2 seaters: 34“
Overall length for 4 seaters: 42”
length of slip yokes: 4.125“
diameter of slip yokes:

• FS5R30A - 1.625”
• FS5R90A - 1.5“
• FS6W71C - 1.375”

84-86 companion flange: 1.88“ and 2.24” for opposite sides
87-89 companion flange: 2.25“ per side

Jason84NA2T - http://www.Z31performance.com
AZ-ZBum - *Offline* http://www.az-zbum.com