GKTECH
S-Chassis Front Drop Knuckles
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At Gktech we now have three different variants of our world-renowned front drop knuckles!
All of them are designed and build similar, sharing the following;
- Light weight
- Robust design
- S13/ S14 variations
- 4130 Chromoly
- CMM measured, CAD designed and FEA tested
- E-coated (Electrophoresis Coating)
We have tailored the knuckles to suit all types of motorsport that your S-Chassis is used for, the options we have are…
Grip knuckles
These have been specifically designed for Grip/ Time-Attack racing in mind, we have lowered the balljoint height 50mm for roll center correction while also lowering the steering mount 64mm for bump steer correction.
Being that they are Grip/ Time-Attack specific we have kept the OEM ackerman and OEM steering arm length, in the factory positioning.
- Ball joint height lowered 50mm
- Steering mount lowered 64mm
- Lightweight (S13 version is 3.1kg and S14/S15 is 3.2kg)
- Provision for ABS sensor
NOTE: Due to the 64mm of bump steer correction some tie rods may interfere with the inside of your rim. This is entirely dependent on both the inside diameter of the rim and the length/type of tie rod that you are running however as a general rule a 17" rim or larger will be required.
From there, we have the hybrid of the Grip knuckle and the Drift knuckle, which is the;
Drift/Grip knuckles
These have the best of both worlds, with the driveability that the grip knuckles have, the balljoint height has been lowered 50mm for roll centre and bump steer correction while also having around up to 60 degrees of steering lock available.
They have been designed with a linear steering response making them super smooth and predictable to drive with. They are still a super competitive knuckle to drive on in terms of drifting, but just don’t have the extra edge the pro knuckles do (as seen below).
This knuckle is perfect for the all-rounder, who enjoys both Drifting and Grip/Time-Attack.
To get the maximum amount of rack travel and see the full potential with these knuckles we recommend the straight style bolt on rack spacers if your rack is moved forward. If it is not moved forward and this is not something you are able to do, we recommend the offset rack spacers which move the inner tie rods forward without needing to relocate the rack. This mitigates bind and also includes the additional rack travel similar to the straight style bolt on rack spacers.
- Ball joint height lowered 50mm
- Lightweight (S13 version is 3kg and S14/S15 is 3.1kg)
- Provision for ABS sensor
Lastly we have;
Pro Drift Knuckles
These knuckles have specifically been designed to be used for drifting only.
These bad boys have had their ball joint height lowered 50mm for roll centre and bump steer correction and are able to achieve around 70 degrees of steering lock with ease!
They are not for the faint hearted being our pro knuckle they feature caster trail and adjustable Ackerman, that's right, adjustable Ackerman so that you can really dial in your front end and be unstoppable.
As mentioned above, to get the maximum amount of rack travel and see the full potential with these knuckles we recommend the straight style bolt on rack spacers if your rack is moved forward. If it is not moved forward and this is not something you are able to do, we recommend the offset rack spacers which move the inner tie rods forward without needing to relocate the rack. This mitigates bind and also includes the additional rack travel similar to the straight style bolt on rack spacers.
These knuckles are too awesome to have provision for ABS, this does mean there is no provision for ABS.
- Ball joint height lowered 50mm
- Lightweight (S13 version is 2.9kg and S14/S15 is 3kg)
- Offset caster trail
- Adjustable Ackerman
NOTE - Being that the Pro knuckles have inbuilt caster trail it is recommended to pair these with our strut tops for best results and for an adequate amount of adjustment, they can be seen HERE
All the listed knuckles are best suited to be used with our Super Lock LCA's which can be seen here:
S/R Chassis front super lock lower control arms (FLCAS's)
If you were planning on purchasing the Super Lock LCA's with the knuckles listed above, we do have them in a 15% discounted combo as seen here:
S Chassis super lock combo
Want more technical information, product benefits and a look into the design process?:
S Chassis steering knuckle blog 
FAQs
Are you able to run the 350z front calipers with these knuckles?Yes! The 350z caliper fits the OEM S-Chassis knuckle just by drilling the caliper mounting hole from 12mm to 14mm. We have left enough meat on the caliper mount to allow for this also.
What's so good about drop knuckles?
A lot of people think that the best thing about knuckles (aka uprights) is getting more steering angle to drift however the main advantage of installing knuckles is the roll centre correction and bump steer correction. Extremely lowered vehicles typically handle poorly, with drop knuckles like these installed the handling will improve dramatically.
The reasoning behind that is as your lower control arm and castor (aka tension) rods are sitting near horizontal, this now brings them back to where they were before the car was lowered, which is exactly what you want for optimum handling.
Are there any modifications required, are these hard to fit?
No modifications are required, simply just remove and refit. You will also need to re-adjust your coilover height due to the drop incorporated into the knuckle and we recommend getting a wheel alignment.
We design all our parts around fitting OEM parts also.
What alignment do you recommend?
With alignments being personal preference, it's a hard question to answer. The V4 pro were designed to be run with -3 camber, 4 degrees of caster and starting at 4mm of toe out.
Do I need to do any other modifications to get the most from these knuckles?
You will see an improvement in feel just bolting these directly in, but will not see their full potential.
We recommend to notch your lower control arms or at least modify your bump stops. This will allow more room of the tie rod end to travel inwards on lock, thus having more lock.
We also recommend bolt on rack spacers if you are running out of rack travel and or offset rack spacers, which still provide more rack travel but are mainly used to mitigate steering bind.
Keep in mind clearance is key, the more clearance everything has the more lock will be achievable, so you would need to ensure your swaybar, lower control arm and caster arm allow for this. We make all high clearance versions of those parts which can be found on the website.
Can I do backwards entries with the Pro knuckles?
Good question, we have seen our customers do that with these knuckles!
Provided you have enough lock, clearance (and skill) we don't see why not
VEHICLE COMPATIBILITY
Nissan
S13 CA18 180SXS13 CA18 SILVIA
S13 SR20 180SX
S13 SR20 SILVIA
S14 200SX/SILVIA
S15 200SX/SILVIA