ACT Heavy Duty Street Clutch Kits (Sprung Clutch Kit - With 11" Disc) | GMC Suburban - K25, Base, naturally aspirated, 305ci V8, OHV (1977-1978)

Vendor: ACT

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  • Buckle the blacktop with the ACT Heavy-Duty Street Clutch Kit
  • Increases torque capacity by 40%
  • Perfect for heavy-duty street use and occasional racing
  • Crafted using vehicle, dyno & lab testing, CAD & 3-D modeling, and Finite Element Analysis software
  • Exceeds stock performance to keep up with your high-performance engine
  • Includes ACT’s Heavy-Duty Pressure Plate and one of three street discs (depends on model)
  • ACT Heavy-Duty Pressure Plate:
    – 20-50% increase in clamp load
    – Stock-to-moderate pedal feel
    – Recommended disc: street or race
  • Modified Street Disc (MM):
    – Quicker engagement
    – Quiet operation
    – Improved friction material
    – Perfect for street or occasional race use
  • Performance Street Disc (SS):
    – ACT’s most popular disc
    – Measures 8mm thick when compressed (varies slightly)
    – Faster engagement and operation
    – Improved hub and burst strength
    – Crafted from the finest organic friction material
    – Perfect for street and race use
  • Rigid-hub Street Disc (SD):
    – Minimum weight for faster shifts
    – Ultra-high burst strength
    – Engagement is quick, smooth and precise
    – Provides race-proven performance with street manageability
    – Increased gear noise
  • Includes pressure plate, disc, release bearing, pilot bearings (if required) and alignment tool
  • Available in several torque capacities and driving characteristics (consult the ACT abbreviation code chart to find your clutch)
  • Your ACT Heavy-Duty Street Clutch Kit is backed by a 90-day warranty
What's it gonna be today? An all-out assault on the asphalt? A trip to the track to tear up the tarmac? Either way, it's nice to know your daily driver can handle both. And the easiest way to do that is to outfit it with the ACT Heavy-Duty Street Clutch Kit. Boosting torque capacity by a ground-pounding 40%, the ACT HD Street clutch is all you need for gnarly street driving and occasional racing action.

The ACT heavy-duty street clutch kit transmits power with a carefully calculated combo of ACT components. All kits include the Heavy-Duty Pressure Plate to increases clamp load by 20-50% with a stock-to-moderate pedal. Then depending on model, ACT includes their popular Performance Street Disc, Modified Street Disc or the Rigid-Hub Street Disc. Together, either combo sets you up for road and track domination.

ACT has built a solid reputation with drivers around the world as the leading performance clutch and flywheel manufacturer for heavy-duty compact and performance motoring. From racing for pinks or parking spots, checkered flag or fast-lane superiority, the ACT street clutch HD gets you there first! Even better, ACT backs your Heavy-Duty Street Clutch Kit with a 90-day warranty.

We will gladly accept approved returns or exchanges of products 14 days from the date of receiving your order.

If the received date cannot be proven (no tracking information), the 14 days will be based from its order date.

Please start returns using our Returns Manager.

Returned items must be in new/unused condition.

1977 GMC Suburban
1977 GMC Suburban K25 Base naturally aspirated 305ci V8 OHV
1978 GMC Suburban
1978 GMC Suburban K25 Base naturally aspirated 305ci V8 OHV

When will I receive my order?

Please allow 2-4 business days for order processing and verification. Although certain items are kept in stock, some products are custom made to order and require manufacturing time.

Upgrading your shipping from standard ground shipping expedites the shipping portion of your order only. It does not expedite the time it takes to pull, package and prepare shipment (which could be several business days). After your item has been prepared for shipment, your order will be delivered based on the shipping method chosen during check out.

Orders placed that include Hoonigan branded merchandise and Carcaine Parts Supply parts may ship out at different times from different locations - please don’t hesitate to reach out to us at any time to check in on the status of your Carcaine Parts order.

If you are unable to place an order upon entering your shipping address, one or more of the item’s in your order may not be CARB / 50 State compliant. For more information should you encounter this, please contact us.

For questions regarding shipping, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

While we try our best to provide up to date shipping information, shipping dates are subject to change at any time.

We are not responsible for any lost, stolen, or damaged shipments. The buyer assumes all responsibilities of claims made with the shipping carrier. Please check back with us periodically for any updates regarding our shipping policies. Currently, Carcaine Parts Supply is only available to ship to the contiguous 48 states and does not offer international shipping at this time.

What's your Returns & Exchanges policy?

Items are eligible for return within 30 days of delivery. If the received date can not be proven, the 30 days will be based upon the order date. Items eligible for return must be in new and unused condition.

Defective items are eligible for a full refund upon return and will not be subject to return shipping and/or restocking fees. Orders that are free of error are subject to return shipping fees and restocking fees. Refund amount on orders free of error will be the amount paid minus shipping and/or restocking fees.

Tuners and programmers are deemed “used” upon plugging them into your vehicle and may be unreturnable as a result.

Brembo Big Brake Kit and Brembo GT Kit returns will not be accepted because of lack of clearance. Please verify wheel clearance before purchasing. Brembo Big Brake Kits approved for return are subject to at least a 15% restock fee and the customer will be responsible for return freight charges. All Brembo returns must be in new condition (no bolt marks, paint chips, etc.), in the original packaging, and MUST include the anti-counterfeit card. Refunds for returned Brembo orders may be held until Brembo has inspected the returned order and deemed it acceptable.

Customers are liable for items that are deemed “unreturnable” upon receipt of return and may be subject to the order being charged back to the full amount. For questions regarding returns, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

Returns and Exchanges are subject to change at any time.

How do I track my order

Use our Order Lookup tool, or Please feel free to contact us at - We’d be happy to provide you an update to your order.

Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

How do I cancel my order?

Please contact us and we’d be happy to assist you with cancelling your order.

Cancellation requests will be denied for orders that have shipped out already and may be subject to restocking and return shipping fees. If an order should ship out or be in transit while a cancellation has been requested please accept the package, contact us, and we will set up a return for you.

For questions regarding cancellations, please do not hesitate to reach out to for more information. Carcaine support hours are Monday through Friday 7am-3:30pm Pacific.

Cancellations are subject to change at any time.

How do I contact Carcaine Support?

Carcaine Parts Supply support hours are Monday through Friday 7am-3:30pm Pacific. We can be reached via Email at or by phone at 888-432-1847.

For information on Hoonigan branded merchandise, please shoot an email over to