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Hydraulic Clutch Slave Retrofit Kit
AMC Bellhousings

Hydraulic clutch release systems have gained wide acceptance in the aftermarket as a keen solution to both engine conversion and stock clutch linkage replacement scenarios.

Novak's Hydraulic Clutch Slave Retrofit has evolved into its best rendition, as our #HCRA. It bolts to the popular AMC I6 & V8 style bellhousings on 232, 258, 4.0L, 304, 360 & 401 engines. This kit will work with conversion or factory transmissions.

AMC Hydraulic Clutch Release Kit

Option I - 7/8" bore

  • e.g., Jeep CJ & FSJ vehicles with 7/8" or larger factory hydraulic release
  • Other types of factory or custom vehicles
Kit HCRA-78, hydraulic clutch retrofit slave system, AMC bellhousings, 7/8" slave cylinder
Part #: HCRA-78
Weight: 2.20
Price: $176.00
Includes the slave cylinder (7/8" bore) assembly, anchor bracket, adjustable pushrod, return spring, fastening hardware, instructions

Option II - 3/4" bore (our most popular size)

  • e.g., Jeep CJ, FSJ, XJ, YJ, TJ vehicles with factory 3/4" hydraulic master cylinders
  • Other types of factory or custom vehicles
  • Note that the Novak 3/4" slave is usually compatible with many 7/8" master cylinders, but will increase required pedal pressure and give a less precise feel
Kit HCRA-34, hydraulic clutch retrofit slave system, AMC bellhousings, 3/4" slave cylinder
Part #: HCRA-34
Weight: 2.19
Price: $176.00
Includes the slave cylinder (3/4" bore) assembly, anchor bracket, adjustable pushrod, return spring, fastening hardware, instructions

The Kit
Our #HCRA clutch kit has been engineered to bolt to most AMC style bellhousings and to work with their associated pressure plates.

All included components work as a system to insure a straightforward installation. The arm provides the proper ratio for the great majority of pressure plates and the T6 hardened and hard anodized billet aluminum slave cylinder and piston are absolutely durable, yet rebuildable or replaceable down the road, if necessary.

Available Kit Versions
Hydraulic clutch release systems are typically engineered to have a 1:1, master-to-slave ratio, where the leverage is not obtained through differential hydraulics. The force is obtained through the leverage provided by the clutch pedal and then the release arm / fork at the throwout bearing, like a conventional mechanical clutch - the method of transmitting the force is the only difference. These principles are discussed here.

As such, the installer will generally choose between our 3/4" bore version or our 7/8" bore version to best match the diameter of their master cylinder.

For your best benefit, read and understand the principles of working with hydraulic clutch release systems and determine the applicability for your vehicle.

* Note that Full Size Jeeps (Wagoneer, Cherokee, J Truck) vehicles do not accomodate conventional, firewall mounted master cylinders due to the brake booster and the electrical bulkhead connector. If converting one of these Jeeps to hydraulic clutch release, the installer will need to custom configure a master cylinder accordingly.

Bellhousing Compatibilities
The HCRA has been proven to work on all known clutches for AMC engines.

The Novak HCR kit vs. factory hydraulic releases

Some AMC bellhousings feature bosses to mount a factory style slave cylinder. These cylinders are limited to the 7/8" bores and additionally, we've seen their prices rise and availability fall.

The Novak kit will work across the variety of bellhousings, and allow for use with the more popular 3/4" master cylinders, provide adjustability and ongoing availability and support.

All known bellhousings made from 1972 through 1986 are compatible, including those adjoined to these transmissions:

Aftermarket bellhousings such as Lakewood, McLeod and others have thus far proven compatible with this system.

Incompatible Bellhousings

Driveshaft Clearance On Wranglers
Since this slave cylinder assembly mounts on the driver's side, it may be in proximity to the front driveshaft on Wrangler. If your Wrangler has factory springs that have sagged some, a risk of interference exists here. We have seen good clearance on Jeeps with good factory and, of course, lifted spring sets.

Hydraulic Lines and Fittings

Our slave cylinder uses a highly standard 1/4 DOT fitting. This is the female 7/16-24 threaded fitting ready for an SAE, male double-flare fitting. Most installers that have done any work with brake lines will be very familar with these, as will their local parts supplier.

For the easiest installation and the most professional look, we recommend our braided stainless steel and poly wrapped flex hose and line assembly (right). It features a flareless compression coupling that can accept the provided straight, 90 degree or 180 degree pre-bent lines. Or the installer can bend the provided straight line to best match their situation.

This line is ~3' in length.

Hydraulic line & hose assembly

Assembly, clutch line and flex hose, stainless and poly wrapped, 7/16-24 DOT 1/4 fittings
Part #: HCR8
Weight: 1.30
Price: $89.60
For use with Novak and other hydraulic clutch master to slave applications with standard 7/16-24, DOT 1/4 fittings
Hydraulic Slave Fittings



Master cylinder fitting

Hydraulic clutch release line adapter, late style, short (typ. TJ)
Part #: HCA-1
Weight: 0.50
Price: $20.02

Master cylinder fitting

Hydraulic clutch release line adapter, early style, long (typ. YJ)
Part #: HCA-2
Weight: 0.50
Price: $20.02

Optional Adapters for Later Model Jeeps
These useful adapter fittings (left) permit the adaptation of our #HCRC to 1991-present Jeep master cylinders that use the o-ring style fittings.

These fittings each feature a male 1/4" DOT threaded ends so that the installer can use or make standard hydraulic lines or hoses for the particular situation. The tip inserts into your 1991-1995 Jeep YJ (and 1991-1996 Jeep XJ) or 1997-present Jeep TJ & XJ master cylinder using the factory style o-ring and retaining pin. We recommend that you verify your particular fitting with the image and descriptions below prior to ordering.

Note that 1980-1986 CJ's and 1987-1990 YJ's master & slave cylinders already feature a female DOT fitting and do not require these adapter fittings.

A common example of hydraulic hose / line use of these adapters when installing the #HCRA kit is to buy or fabricate a line with a female DOT 1/4 fitting for the adapter/master side of the circuit. This line should then feature a male DOT 1/4 end for the slave side of the #HCRA cylinder port.




Optional Rebuild Kits
HCR series rebuild kit

Kit HCRK-34, rebuild for Novak 3/4" hydraulic slave cylinders
Part #: HCRK-34
Weight: 0.16
Price: $23.90
Contains the boot, piston, u-cup seal and compression spring
Kit HCRK-78, rebuild for Novak 7/8" hydraulic slave cylinders
Part #: HCRK-78
Weight: 0.16
Price: $23.90
Contains the boot, piston, u-cup seal and compression spring