DMI (Diversified Racing) Bulldog 1500HP Rated Quick-Change Differential
Manufactured by Bulldog, a name synonymous with dirt track and stock car racing, this is a quick-change differential rated for 1500HP class vehicles.
Designed for use in high-output vehicles such as drag cars, it is recognized as one of the most widely used quick-change units, excelling in strength, durability, and serviceability.
Key Features
Forged & CNC-Machined Aluminum Side Bells - High rigidity and durability
Kwik-Fill Rear Cover - Easy oil filling and changes, increasing maintenance speed at the track
1350 Series Compatible Forged 8.8-inch Front Yoke
Reinforced Lower Shaft using Vascomax 300 (High-Impact Material)
Thor35 Aluminum Spool (35-Spline CV Flange) - Reinforced structure capable of withstanding high torque
Bulldog Super G 4.12 Ring & Pinion - High-reliability parts with years of racing pedigree
Designed for 1500HP+
Spool / LSD options available
Various final gear sets are available, allowing gear ratio changes in just a few minutes. (View the ratio chart here) Additionally, Winters gear sets are compatible with this Bulldog quick-change.
At Shaft-ya, we carry a large selection of skid plates for quick-changes. Skid plates are an essential item for quick-change differentials as they protect the differential case from damage or wear caused by surface contact.
We also offer custom driveshaft fabrication for DMI Bulldog and Winters quick-changes; please check here for details.
Both types of quick-changes mentioned above use a 1350-spec differential flange. We strongly recommend using Mark Williams billet U-bolt kits.
Important Notes
Compatible with gear sets used in Winters quick-changes.
Since the mounting points are the same as Winters quick-changes, you can reuse the rear member currently set up for a Winters unit.
Differences from Winters Quick-Change
Increased case rigidity through the use of billet side housings (Winters uses cast side housings)
Durable black thermal coating applied to the case - Winters units are uncoated
Equipped with two oil fill ports (rear and side) - Winters units only have side filling
Lead Time
Bulldog quick-change differentials are hand-assembled one by one in the USA by technicians to match various specifications. While we may have stock at our warehouse, if an item is out of stock, it may take several weeks from order to shipment; please inquire about lead times in advance.
Before Ordering
○ Regarding Import Taxes
At the Shaft-ya shopping site, we cover the import consumption taxes incurred during importation on our end, so there are no additional fees beyond the total amount paid at checkout.
○Compatibility Check
Our entire product database is based on North American (USDM) vehicles; please verify whether installation is possible on Japanese (JDM) vehicles before ordering. (If you are unsure if a listed product is compatible with your vehicle, please feel free to contact us. Our support team will look into it for you.)
If you order without verifying compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our homepage, this does not necessarily mean they will fit Japanese model vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are automatically calculated when you enter your shipping address on the checkout page. For large items such as body parts, there may occasionally be a significant discrepancy between the automatic shipping calculation and the actual shipping cost. In such cases, we will contact you individually by email.
In principle, all products are shipped internationally from our US warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please allow yourself plenty of time when ordering. If you are in a hurry, please contact us in advance to confirm delivery times. All products are transported via air freight. No shipments are made via sea freight.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
In principle, all products we handle are designed and manufactured outside of Japan. Please note that they are not compliant with the "Japanese vehicle inspection system," and we cannot provide strength evaluation documents or similar paperwork for the Japanese inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival of your product. Since all products are shipped internationally from outside Japan, there is a possibility of shipping damage to the packaging or the product. We will only provide returns, refunds, or replacement exchanges for items with shipping damage, defective products, or incorrect items if you contact us within 7 days of receipt. Please understand that for products sold through our company, warranty-related support will be handled "exclusively through us." Please note that we do not handle support through other companies or distributors located within Japan.