GKTech 240SX/Skyline to 350Z/370Z Diff Conversion Bushings
The GKTECH 240sx/Skyline to 350z/370z Diff conversion bushings allow you to bolt in the stronger 350z/370z/G35/G37 differential to your 2 bolt R200 S14/S15/R33/R34 subframe.
The bushings are CNC Machined from 6061-T6 aluminium and require no further modification to the subframe, just simply press the two bushings into the diff, while pressing the other in the subframe.
You will notice there are two options to choose from, most commonly people have the single bolt cover, which comes as shown in the product photo.
The other selection is for two bolt Z33/Z34 diff housings, which will come with two front bushings and two rear bushings.
- Nissan S14 240SX
- Nissan S15 Silvia
- Nissan Z32 300ZX
- Nissan Skyline R32 GTR
- Nissan Skyline R33 GTS-T
- Nissan Skyline R33 GTS-4
- Nissan Skyline R33 GTR
- Nissan Skyline R34 GT-T
- Nissan Skyline R34 GTR
NOTE: Upon fitment, please check driveshaft (CV/axle) length to ensure there are no possibilities of the driveshaft (CV/axle) overextending or driveshaft (CV/axle) compression, which may lead to failures.
Will this fit my car?
We can only confirm fitment for the vehicles listed above under "vehicle compatibility". If your car is not listed there, then we don't know if it will fit.
Do you make these to suit other cars?
We only sell the parts listed on our website. If it's not listed on our website, then we don't sell it. Sorry.
What's the advantage of using the GKTech 350/370z diff conversion bushings?
The 350z/370z/G35/G37 diffs are becoming more readily available and are newer than the 15+ year old diffs people use now. They also have driveshaft (CV/ axle) sensors which are great to use for calculating wheel speed. The stub spline that goes into the diff center is the same as R33 GTR being a 31 spline. As opposed to the R32 GTR diff being 30 spline and the R33 GTS-T diff being 29 spline.
The pinion gear thread is also larger on these diffs then any S/R chassis diff. They also use Rzeppa style driveshafts (CV/ axles), which are significantly stronger as oppose to the Tripod design S/R chassis have which are weaker.
The driveshafts of the all the CV/ axles excluding the 370z also directly bolt up to S/R chassis wheel hubs. The 370z shafts have a GTR spline output to the rear wheel bearing/hub, meaning the wheel bearing/hub would need to be changed to the GTR equivalent.
The driveshafts (CV/ axles) also directly bolt up to S/R chassis wheel hubs.
What modifications are required, is this hard to fit?
You will need to redrill your diff flange to suit your tailshaft bolt PCD, which can be done relatively easily. Then press the bushings into the diff and subframe. Please take note of which direction the rear bushing is to be facing based on the position of the diff stud before pressing the bushing in.
Is there anything else needed for installation?
You will need to purchase the diff itself. Apart from that, the OEM hardware can be used as the bushings will arrive as shown in the product photo.
Can I install this myself? If so how long will installation take?
Yes, it is relatively straightforward. Once the subframe is out it should take around 45 minutes.
Do these bushings offset where the diff mounts in the subframe?
No, the bushings have been designed to align the diff in the center of the subframe.
I keep breaking the teeth off my crown wheel, will this diff be strong enough to stop that happening?
No, the crown wheel and pinion and the same between S/R/350z/370z/G35/G37. That is why they are still called an R200.
What sort of ratios do these diffs have?
The 350z/370z/G35/G37 diffs have a wide variety of OEM ratios which can be seen here;
Z33 - MT - R200 - 3.538
Z33 - MT - R200V - 3.538
Z33 - AT - R200V - 3.357
Z34 – MT – R200V – 3.692
Z34 – AT – R200V – 3.357
G35 - Sedan - AT - R200 - 3.357
G35 - Sedan - MT - R200V - 3.538
G35 - Sedan - AWD - AT - R200 - 3.357
G35 - Coupe - MT - R200V - 3.538
G35 - Coupe - AT - R200 - 3.357
G35 - Coupe - AT - R200V - 3.357
G37 – Sedan – AT - R200V – 3.357
G37 – Sedan – MT – R200V – 3.692
They also have aftermarket support with ratios from 3.9, 4.1 and 4.3