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Product Summary

.750" Bore Size, 11.55" Overall Length, Aluminum

  • Easily add a hydraulic clutch master cylinder to your 1967-1972 Chevy pickup
  • 10-gauge powder coated steel mounting plate positively locates clutch master cylinder on firewall
  • Includes a 3/4-inch bore hydraulic clutch master cylinder with mounting hardware
  • Hardware included to connect master cylinder to your original or replacement clutch pedal
  • Provides ample clearance for large diameter power brake boosters
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Key Specs

MFG. Part #91025681
Bore Size.750"
Overall Length11.55"
Centerline of Holes2.25"
Outlet Fitting3/8-24 IFF
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Speedway Motors 91025681 Details

  • Direct fit for all 1967-1972 Chevy C10/K10/C20/K20/Blazer/Suburban truck models
  • Complete hydraulic conversion kit updates troublesome mechanical linkage
  • 3/4-inch bore master cylinder works well with hydraulic release bearings/slaves
  • 10-gauge powder coated steel mounting plate provides increased rigidity to firewall
  • Mounting plate provides clearance to master cylinder for large power brake boosters
  • Installation requires drilling mounting holes in firewall and clutch pedal
  • Master cylinder pushrod extension hardware is zinc plated to prevent corrosion
  • All mounting hardware for master cylinder and connection to clutch pedal is included
  • Does NOT include release bearing/slave cylinder or hydraulic fluid line/fittings

Update Your Chevy Truck’s Mechanical Clutch Linkage to Hydraulic

Being a proud member of the “Three Pedal Club” does not mean every time you get behind the wheel it has to be leg day at the gym as well. With today’s traffic congestion many of us will often give pause to taking out our trusty C10 pickup for a cruise. The mere thought of all that clutch in/out work most likely already has the calf muscles in your left leg twitching, and we don’t blame you. The original mechanical clutch linkage is rudimentary at best and toss in a performance clutch and it can really be a bear to get that pedal modulated. Upgrading from a mechanical to hydraulic clutch conversion means smoother engagement, less pedal effort, and no more “erector set” under the hood taking up valuable exhaust header and steering linkage space.

Add Our Hydraulic Clutch Conversion Kit and Give Your Left Leg A Rest

The factory “Z-bar” style linkage relies on pivot points between the frame rail and the engine. This means as your engine’s torque increases (and engine mounts wear or fail) the linkage can bind, leaving your clutch pedal on the floor and your engine and trans disengaged. With no load on the engine from the drivetrain and your right foot buried to the wood, you better have a rev limiter because if you’re not quick on the loud pedal your engine’s rpms are headed north really, really fast. All of this adds up to a really bad day and more than likely a ride of shame home on a roll back.

But things don’t have to be that way. By adding our hydraulic clutch conversion kit to your 1967-1972 Chevy truck you get a strong 10-gauge steel black powder coated mounting plate that reinforces the firewall and provides a mounting point for our 3/4-inch bore hydraulic master cylinder with integral fluid reservoir. This mounting plate also works as your drill template when drilling the mounting bolt holes and clutch pushrod hole in your firewall. Once mocked up it is simply a matter of drilling a hole in your clutch pedal arm to attach the master cylinder pushrod hardware to. This mounting plate allows the hydraulic clutch master cylinder to clear both manual and power brake setups, even large 11-inch diameter power brake boosters clear. This is not a universal hydraulic clutch kit, but a hydraulic clutch conversion kit specifically designed for 1967-1972 Chevy trucks like the C10 and Suburban. Whether you are planning a Muncie 4 speed hydraulic clutch conversion or swapping a modern manual trans with hydraulic throwout bearing, this kit is will help you get the job done quickly and easily. We offer a similar conversion kit for you ’60-’66 C10 pickup owners as well!

Converting To a Hydraulic Clutch Conversion Kit Cleans Up Your Engine Bay

The stock mechanical clutch linkage is not only a pain to manually adjust and keep in good working order, but the linkage often interferes with exhaust and steering upgrades. Want to convert to rack and pinion with a tilt column? In the way. Want to add some nice tubular headers to your V-8? In the way. Going LS swap? There’s no provision for the Z-bar pivot to thread into on the block side. Overall, the mechanical linkage just creates a lot of headaches in other than a completely stock and original drivetrain. With our conversion kit being so easy to install why not go hydraulic and rid yourself of the maintenance hassles of constant lubrication, wear, and adjustment of the mechanical parts, which if they are original are no doubt at the end of their service life by now?

The included Speedway clutch master cylinder uses a traditional 3/8-24 inverted flare fluid port to allow plumbing of your fluid line to your clutch hydraulic throwout bearing or external push/pull slave cylinder. The reservoir is 3-1/2-inches tall and holds 1.4-ounces of fluid, while the 3/4-inch hydraulic clutch master cylinder bore is perfect for most hydraulic throwout bearing or slave cylinder setups, providing smooth pedal operation with light effort, making your drive that much more enjoyable. Plus, modern hydraulic clutch setups are self-adjusting too! No more crawling under your truck to adjust the mechanical linkage as your clutch disc wears! A weekend under your truck now upgrading to a hydraulic clutch setup will no doubt save you many weekends in your future under your truck adjusting and maintaining your mechanical clutch linkage. Sounds like a winner to us!

Speedway Motors 91025681 Specifications

KEY SPECS
MFG. Part #91025681
BrandSpeedway Motors
Bore Size.750"
Overall Length11.55"
Centerline of Holes2.25"
Outlet Fitting3/8-24 IFF
Thread Pitch5/16-24
Reservoir TypeIntegral
Material TypeAluminum
Hardware IncludedYes
GENERAL
Capacity1.40 fl. oz.
Reservoir Size (oz)1.40
Sold in QuantityKit
NotesFluid line and release bearing/slave cylinder not included REPLACEMENT CAP: 83533016239
Flange to End Length4.09"
ColorNatural

Ratings & Reviews

4.8

11 Reviews

Overall Assessment

Customers appreciate the product for its compatibility, particularly noting its efficacy in conversion projects and swaps to 5-speed, as seen with a '53 Chevy truck and LS with AR5 transmission. Assembly, although requiring precision, is straight-forward, further simplified by the completeness of the kit. The product shows a good adjustment range, though some have maximized the extension rod's adjustability. The clutch pedal's feel and responsiveness have been positively reviewed. Additional purchase suggestions include new clutch pedal shaft bushings and -3AN adapter fittings for a universal line to the cylinder. Despite some yet to install the product, early inspection indicates good quality. The repeat purchase likelihood is high among users.

4.8

11 reviews

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9

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Filter by Ratings

Great part, good price.

5.0

6 months ago

Bill

Australia

Verified

Perfect fit in a right hand drive C10. Bolts up to a triple reinforced section of the firewall.

Would Recommend

Great kit

5.0

6 months ago

Al

Idaho

Verified

This kit is well thought out in design and built with quality. The reinforcement plate set the exact position for locating the mounting holes in my 1970 GMC truck. Good job Speedway Motors!

Would Recommend

Hole location

4.0

6 months ago

Dennis

Mountain Home, AR

Verified

There are no instructions on how to locate the correct location of the hold to be drilled in the existing clutch pedal. The threads from the heim joint to the pushrod where fouled up. Fortunately I have a thread chaser.

Would Recommend

Recommend

5.0

11 months ago

Slick

Oregon

Verified

Fits great

Would Recommend

Great Product! Worked good so far.

5.0

a year ago

Husker

Illinois

Verified

I have not tested out the functionality of this clutch kit yet, but it was a pretty straight forward install on it. Should work great for my T56 transmission.

Would Recommend

Yes

5.0

a year ago

Sloan66

Tennessee

Verified

Solid bracket, came with good instructions

Would Recommend

Great product.

4.0

a year ago

jed

Greensboro ,NC

Verified

The installation instructions were easy to understand .It went in with no problems.My only suggestion would be to offer a complete kit with a slave cylinder and bracket for small block chevy applications.

Would Recommend

Just what I was looking for to make it 5 Speed

5.0

2 years ago

Guido

Ontario, Canada

Verified

I am using it on my 53 Chevy truck and it will allow me to mock up my clutch pedal.

Very complete and easy kit.

5.0

3 years ago

Matt J

NNJ

Verified

This worked out great for my LS swap with an AR5 transmission. I had a bit of trouble getting the holes drilled but once I did, everything went together smoothly. The pedal feel is good, thought the extension rod ended up being nearly at the end of it's adjustability to have room to drill the hole in the pedal arm. I'd recommend getting some new clutch pedal shaft bushings while you have it all apart. I also ended up getting an adapter fitting to go from the 3/8" line to -3AN so that I could use an off the shelf universal line for to the clutch cylinder.

Would Recommend

I would buy this again!

5.0

3 years ago

Umphy

Texas

Verified

Was so easy and great install.

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