Z31 rear conversion

CamInHead · #1 21-03-2011, 16:33

Quote:

Originally Posted by s13eater

just measured the z31 and s12 shafts matey, they both measure 29.5mm and are 29 spline

and the s12 is a r200 diff.

We tried to swap over the driveshaft bearing at the diff end and the Z31 input shaft is just slightly too wide to accept the stock S12 bearing ?
Granted I don't have a vernier to measure it though.

edit: did you notice the Z31 has symmetrical driveshafts too ?

s13eater · #2 21-03-2011, 16:35

Quote:

Originally Posted by CamInHead

We tried to swap over the driveshaft bearing at the diff end and the input shaft is just slightly too large ?
Granted I don't have a vernier to measure it though.

edit: did you notice the Z31 has symmetrical driveshafts too ?

i'am going to strip um down now, you got me worried.

CamInHead · #3 21-03-2011, 16:41

Shaun where's that picture you put-up of your z31 sub assembley ?

s13eater · #4 21-03-2011, 16:46

on second thoughts i got them out and put all six shafts back, i don't think i can get my head round it until i've put the plenum back on and got it mapped.

CamInHead · #5 21-03-2011, 18:37

Well I've done some digging and the 4-stud shaft is a "Double Offset Birfield" type" and the 6-stud is the "Tripod-Tripod" type. Other than the name I have no informatin on one or the other. However, the companion flange in the suspension arm looks to be specific to the driveshaft and the part is listed in the various US nissan parts websites. Looks like the s12 was only ever the T-T type.

CamInHead · #6 21-03-2011, 20:52

ebay has thrown up an open turbo diff which will match with my driveshafts for £95 shipped. I always thought Turbos were LSD type ? Either case that may be my best bet.

s13eater · #7 21-03-2011, 20:56

Quote:

Originally Posted by CamInHead

ebay has thrown up an open turbo diff which will match with my driveshafts for £95 shipped. I always thought Turbos were LSD type ? Either case that may be my best bet.

hows draconis done it?

Draconis · #8 23-03-2011, 01:14

Yeah, as far as I knew all Z31 Turbo's had a form of LSD. The late Turbos, MKII, had a clutch-type differential while the MKI I think had a viscous type.

In addition, my understanding, the turbo diff also has different splines in the axle. So if you go that route, the turbo Z31 axles are required.

I currently have my stock open differential with the NA MKII rear end. Because the NA MKII rear end is basically the same as the S12, the only difference is that the hub allows for a vented rear disc. It was literally plug and play. I dropped down my stock S12 rear and bolted up the Z31 NA MKII rear end. The bolts all matched up, the brake lines had to be slightly massaged for clearance spacing on the hub (not much at all) and the Z31 axles bolted right in. For this reason and simplicity, I suggest this route.

Turbo is ideal but has the possibility of containing more issues.