Product Summary

Chevy Small Block V8, Chevy Big Block V8, 0.68" Travel

  • Complete hydraulic throwout bearing and hose kit for stock-style 3-speed and 4-speed Chevy clutches only
  • Includes a Speedway GM Stock Clutch Hydraulic Throwout Bearing, Bleeder Screw Assembly, 1/8" NPT adapter fitting, and AN4 Braided Stainless 12" Line
  • Bearing typically used with all OEM & OEM replacement clutches, Muncie 4-spds, Saginaw 3 & 4-spds, Borg-Warner 4-spds, Jerico 2 & 4-spds
  • Comes with detailed instructions for a painless installation
  • Will not work with Ram Couplers or mini clutches because of limited extension on our hydraulic throwout bearing, .688" travel

Comes as a Kit

Key Specs

MFG. Part #91605004
BrandSpeedway Motors
Throwout Bearing StyleHydraulic

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Speedway Motors 91605004 Details

Clutch Bearing

  • Simple installation upgrades your GM transmission to hydraulic clutch release
  • Built-in fail-safe retainer prevents over-extension of the hydraulic release bearing
  • Works with OEM-style diaphragm clutches for 3- and 4-speed GM transmissions
  • Works with aftermarket GM-spec Tremec TKO-500 and 600 5-speeds
  • Complete kit features hydraulic release bearing, anti-rotation studs, and air gap shims
  • Lower pedal effort compared to stock-type mechanical clutch linkage
  • Low-profile design fits behind aftermarket clutch pressure plates that are thicker
  • Easily upgraded to an external bleeder configuration
  • 3/4-inch bore master cylinder recommended for most applications
  • Speedway Motors engineered product offers high quality at an incredible value


Hydraulic Clutch Actuation for your Classic Muscle Car, Hot Rod, or Race Car

For many enthusiasts, building a hot rod means it has to have three pedals and not two. A manual transmission is a MUST in their build. We certainly enjoy rowing through the gears ourselves and nothing makes that easier than a hydraulic clutch release bearing (or “throwout bearing” as some still call it). If you buy a new vehicle with a manual transmission today it will come with a hydraulic release bearing setup and that is for two primary reasons, pedal effort and packaging. These same two reasons are exactly why you should consider a Speedway Motors hydraulic release bearing kit for your manual transmission install. No longer do you have contemplate using bulky factory clutch release linkages that bind or take up valuable header and exhaust space and that require constant adjustment and maintenance, nor do you have to live with a heavy clutch pedal that has you reconsidering driving your pride and joy in any traffic. Using a hydraulic release bearing solves all these issues yet is easy to setup when installing your transmission.

Everything You Need in an Easy to Install Kit

Speedway Motors’ hydraulic release bearing kit provides everything you need to ditch your stock, tired mechanical linkage and go hydraulic at a great value. The kit features a new and improved release bearing designed by Speedway Motors’ Engineering Team with a CNC-machined housing, extended fluid line fittings, and a built-in fail-safe retainer. There is simply no way to over-extend this release bearing with this retainer design. Typically over-extending the release bearing means pulling the transmission and reassembling the separated bearing (not to mention cleaning up all that hydraulic fluid in the bellhousing!). Also included are a sufficient number of release bearing shims to correctly set your air gap between the bearing face and clutch, as well as both 5/16- and 3/8-inch anti-rotation studs to fit a wide variety of GM manual transmission applications.

Fits a Wide Variety of Popular GM Transmissions

This hydraulic bearing kit will fit most Chevrolet, BOP, and GMC manual 3- and 4-speed transmissions, such as the Muncie family of 4-speeds, Borg Warner T10 and Super T10 4-speeds, Saginaw 3- and 4-speeds, and even the GM-spec Tremec TKO-500 and 600 5-speeds when using a stock-style 10-1/2- or 11-inch diaphragm clutch. Essentially any GM transmission with a 1-3/8-inch OD bearing collar. The Speedway Motors hydraulic release bearing ships configured with -4 AN fluid line adapters and a standard 1/4-28 thread bleeder screw for in bellhousing bleeding. This can be upgraded easily to an external bleeder setup using Speedway Motors AN hose and fitting kit, PN 91025617. Most applications will work exceptionally well with a 3/4-inch bore master cylinder, such as Speedway Motors PN 91025680. See our bearing travel chart. Your hot rod may be a vintage time piece, but that does not mean your drivetrain has to be as well. Step into the 21st century with a Speedway Motors hydraulic clutch release bearing kit and your left calf muscle will thank you!

Learn more about hydraulic release bearings and how to properly install them by reading our tech article. How to Install a Hydraulic Throwout Bearing.


Bleeder Kit

These quality bleeder kits are designed for use with our GM Stock Clutch Hydraulic Throwout Bearing (91025610).  They feature all lines, adapters, and fittings needed to successfully bleed your throwout bearing. 

Kit includes:

  • 1/8" NPT Male bleeder
  • -4 AN Male to 1/8"NPT Female adapter fitting
  • 12" -4 AN stainless steel straight brake line


Read more about bleeding brakes in our tech article, How To Bleed Your Brake Lines

Learn more about hydraulic release bearings and how to properly install them by reading our tech article. How to Install a Hydraulic Throwout Bearing.


910-25610 Bearing typically used with: 

  • All OEM and OEM replacement 10-1/2- and 11-inch diaphragm clutches
  • Jerico 2-speeds 
  • Saginaw 3-speeds
  • Muncie M20, M21, and M22 "Rock Crusher" 4-speeds
  • Muncie SM420 and SM465 truck 4-speeds
  • Saginaw 4-speeds
  • Borg-Warner T10 and Super T10 4-speeds
  • Jerico 4-speeds
  • GM-spec Tremec TKO-500 and TKO-600 5-speeds

WILL NOT work with:

  • Ram Coupler
  • Ford or Long-style pressure plates
  • May not work with racing style clutches because of limited extension on our hydraulic throw out bearings. The travel is 0.688" inches.


Speedway Motors 91605004 Specifications

MFG. Part #91605004
BrandSpeedway Motors
Throwout Bearing StyleHydraulic
Inside Diameter1.375"
Compressed Length1.710"
Extended Length2.390"
Outside Diameter2.875"
Inlet Fitting-4 AN
Outlet Fitting-4 AN
Hardware IncludedYes
Sold in QuantityKit