Drivetrain
Circle Track Drivetrain Parts: Transmissions, Clutches & Shifters for IMCA Racing at JJ Motorsports
Transfer power efficiently in your circle track racer with premium drivetrain components from JJ Motorsports. Our selection includes transmissions, clutches, shifters, differentials, bellhousings, and more, designed for superior performance, durability, and quick shifts in late models, modifieds, street stocks, and IMCA dirt racing. These high-quality parts ensure reliable power delivery and endurance under competitive track conditions.
Shop trusted brands like Winters Performance and Maxima Racing Oils. Explore related categories such as circle track chassis components for frame upgrades or circle track brakes for stopping power.
Top Circle Track Drivetrain Products
- Winters Falcon LM Transmission 2-Speed Manual Aluminum Case 18 Spline Input WIN60100 – High-performance 2-speed manual transmission for late model racing, with aluminum case, internal hydraulic clutch, IMCA approved for Stock Car, Modified, and Late Model classes; includes crankshaft coupler, 2.4:1 low gear, 1:1 high, reverse, 18 spline input, 27 spline output, 21-5/8" length, and 43 lbs weight.
- 2-Lever Floor Mount Shifter Assembly - Black Aluminum for IMCA UMP Racing – Durable shifter for IMCA and UMP racing, made from high-quality aluminum with black anodized finish; weighs 2 lbs, includes hardware for quick installation, and offers universal fit for efficient gear changes.
- Chevy Clutch Hydraulic Release Throwout Bearing Kit - Racing – Upgrades drivetrain with easy installation; includes hydraulic release bearing, CNC-machined housing, anti-rotation studs, adjusting lock nuts, AN Teflon-lined hose, and adapter fittings; compatible with Chevrolet, BOP, GMC manual transmissions and 5.5-7.25" racing clutches; features fail-safe design and lower pedal effort.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
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- Qty in Cart
- Quantity
- Price
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DMI CT1 Steel Lower Shaft Heavy Duty RRC-1427HD
DIVERSIFIED MACHINE
$259.99If you're running a DMI Bulldog CT-1 rear end, the quality of your lower shaft directly impacts drivetrain durability under load and acceleration stress. This heavy-duty CT1 steel shaft is engineered...DMIRRC-1427HD- SKU:
- DMIRRC-1427HD
- Availability:
- Ships Same Business Day
- Weight:
- 5.28 LBS
- MFG Part #:
- RRC-1427HD
$259.99 -
DMI CT1 Steel Lower Shaft Ground Finish RRC-1427
DIVERSIFIED MACHINE
$200.99The DMI CT1 Steel Lower Shaft is engineered for builders running DMI Bulldog CT-1 rear ends who demand reliable power transfer and precise spline engagement under extreme conditions. This...DMIRRC-1427- SKU:
- DMIRRC-1427
- Availability:
- Ships Same Business Day
- Weight:
- 5.27 LBS
- MFG Part #:
- RRC-1427
$200.99 -
DMI CT1 Lower Shaft Bearing RRC-1411
DIVERSIFIED MACHINE
$25.99The DMI CT1 Lower Shaft Bearing RRC-1411 is a critical component for maintaining precise drivetrain engagement in quick-change rear end assemblies. A worn or failing lower shaft bearing compromises...DMIRRC-1411- SKU:
- DMIRRC-1411
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- MFG Part #:
- RRC-1411
$25.99 -
DMI Gear Cover Bearing Retainer RRC-1390
DIVERSIFIED MACHINE
$11.99The DMI Gear Cover Bearing Retainer RRC-1390 is engineered to maintain precise bearing alignment and support in your DMI Bulldog rear end, ensuring consistent performance under high-load racing...DMIRRC-1390- SKU:
- DMIRRC-1390
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MFG Part #:
- RRC-1390
$11.99 -
DMI Billet Alum Rear Cover w/Bearings Black RRC-1386B
DIVERSIFIED MACHINE
$377.99The DMI Billet Aluminum Rear Cover with Bearings delivers the precision and durability your quick-change differential demands, whether you're running bracket racing or high-horsepower street...DMIRRC-1386B- SKU:
- DMIRRC-1386B
- Availability:
- Ships Same Business Day
- Weight:
- 3.83 LBS
- MFG Part #:
- RRC-1386B
$377.99 -
DMI Posi-Lock Retainer RRC-1366
DIVERSIFIED MACHINE
$42.99The DMI Posi-Lock Retainer RRC-1366 is essential for maintaining pinion stability and preventing differential lock-up during aggressive acceleration and cornering. Built for DMI CT-1 Bulldog rear...DMIRRC-1366- SKU:
- DMIRRC-1366
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MFG Part #:
- RRC-1366
$42.99 -
DMI Bearing for Rear Cover RRC-1350
DIVERSIFIED MACHINE
$36.99The DMI Bearing for Rear Cover RRC-1350 is essential for maintaining precision in your quick-change rear differential under sustained racing loads. A worn or failing gear cover bearing compromises...DMIRRC-1350- SKU:
- DMIRRC-1350
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- MFG Part #:
- RRC-1350
$36.99 -
DMI 2-Bolt Locking Tab RRC-1330
DIVERSIFIED MACHINE
$6.79A secure pinion retainer is non-negotiable in high-performance rear-end applications. The DMI 2-Bolt Locking Tab prevents fastener rotation and keeps your pinion assembly locked tight under extreme...DMIRRC-1330- SKU:
- DMIRRC-1330
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MFG Part #:
- RRC-1330
$6.79 -
DMI Timken Big Pinion Bearing RRC-1311
DIVERSIFIED MACHINE
$102.99Pinion bearing failure is one of the fastest ways to turn a reliable differential into a catastrophic failure on the track or trail. The DMI Timken Big Pinion Bearing RRC-1311 is engineered to handle...DMIRRC-1311- SKU:
- DMIRRC-1311
- Availability:
- Ships Same Business Day
- Weight:
- 0.77 LBS
- MFG Part #:
- RRC-1311
$102.99 -
DMI 4.12 Ring & Pinion RRC-1300
DIVERSIFIED MACHINE
$489.99The DMI 4.12 Ring & Pinion RRC-1300 delivers the gear ratio your high-RPM applications demand, whether you're chasing consistent ET times or maximizing acceleration off the line. A 4.12 ratio strikes...DMIRRC-1300- SKU:
- DMIRRC-1300
- Availability:
- Ships Same Business Day
- Weight:
- 14.29 LBS
- MFG Part #:
- RRC-1300
$489.99 -
DMI CT1 Spool Shim Kit RRC-1276
DIVERSIFIED MACHINE
$44.99Proper spool shimming is critical for achieving consistent differential engagement and eliminating unwanted backlash in high-performance applications. The DMI CT1 Spool Shim Kit gives you precise...DMIRRC-1276- SKU:
- DMIRRC-1276
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MFG Part #:
- RRC-1276
$44.99 -
DMI CT1 Aluminum Spool RRC-1270
DIVERSIFIED MACHINE
$411.99A quality spool is the backbone of any reliable quick-change rear end system. The DMI CT1 Aluminum Spool delivers the strength and precision needed for consistent power transfer during high-load...DMIRRC-1270- SKU:
- DMIRRC-1270
- Availability:
- Ships Same Business Day
- Weight:
- 5.87 LBS
- MFG Part #:
- RRC-1270
$411.99 -
DMI CT1 Side Bell Bearing Alum Spool RRC-1171
DIVERSIFIED MACHINE
$30.99The DMI CT1 Side Bell Bearing Alum Spool is engineered for racers who demand reliable differential performance under extreme load conditions. This aluminum spool delivers the strength and precision...DMIRRC-1171- SKU:
- DMIRRC-1171
- Availability:
- Ships Same Business Day
- Weight:
- 5.87 LBS
- MFG Part #:
- RRC-1171
$30.99 -
DMI CT1 Side Bell Race RRC-1170
DIVERSIFIED MACHINE
$13.99The DMI CT1 Side Bell Race RRC-1170 is a precision axle bearing race designed for the DMI Bulldog CT-1 differential—a critical component that directly impacts load distribution and drivetrain...DMIRRC-1170- SKU:
- DMIRRC-1170
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MFG Part #:
- RRC-1170
$13.99 -
DMI Friction Fighter Quick Change Gears 4G FFQCG-4G
DIVERSIFIED MACHINE
$368.99Quick-change gear sets let you dial in your final drive ratio between rounds without pulling your entire differential apart—critical for competitors who need to adapt to different track conditions or...DMIFFQCG-4G- SKU:
- DMIFFQCG-4G
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MFG Part #:
- FFQCG-4G
$368.99Qty in Cart: 0Quantity:Price:$368.99Subtotal: -
DMI Friction Fighter Quick Change Gears 23 FFQCG-23
DIVERSIFIED MACHINE
$369.99Quick-change gears are essential for racers who need to dial in their differential ratios between sessions without pulling the entire carrier. The DMI Friction Fighter Quick Change Gears Set 23...DMIFFQCG-23- SKU:
- DMIFFQCG-23
- Availability:
- Ships Same Business Day
- Weight:
- 4.20 LBS
- MFG Part #:
- FFQCG-23
$369.99 -
DMI Friction Fighter Quick Change Gears 16 FFQCG-16
DIVERSIFIED MACHINE
$368.99Quick-change gear sets let you dial in your final drive ratio between rounds without pulling the differential—critical for optimizing performance across varying track conditions and fuel loads. The...DMIFFQCG-16- SKU:
- DMIFFQCG-16
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MFG Part #:
- FFQCG-16
$368.99Qty in Cart: 0Quantity:Price:$368.99Subtotal: -
Detroit Locker - Ford 9in 31-Spline Center R18703A
DETROIT LOCKER-TRACTECH
$964.99A quality differential locker is essential for consistent traction on the track—whether you're drag racing, circle tracking, or pushing hard in competition. The Detroit Locker delivers mechanical...DETR18703A- SKU:
- DETR18703A
- Availability:
- Ships Same Business Day
- Weight:
- 16.20 LBS
- MFG Part #:
- R18703A
$964.99 -
Detroit Truetrac - Ford 8in 28-Spline 912A616
DETROIT LOCKER-TRACTECH
$814.99The Detroit Truetrac limited-slip differential is engineered to maximize traction and cornering performance on both street and track applications. Unlike open differentials, the Truetrac's helical...DET912A616- SKU:
- DET912A616
- Availability:
- Ships Same Business Day
- Weight:
- 16.60 LBS
- MFG Part #:
- 912A616
$814.99 -
Detroit Truetrac - Ford 9in 28-Spline 912A587
DETROIT LOCKER-TRACTECH
$685.99The Detroit Truetrac is a helical limited-slip differential that delivers consistent, predictable power delivery to both rear wheels without the maintenance demands of clutch-type units. If you're...DET912A587- SKU:
- DET912A587
- Availability:
- Ships Same Business Day
- Weight:
- 16.46 LBS
- MFG Part #:
- 912A587
$685.99
