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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 6.29 2.70 4.86 7.41 3.18 Steel WIN8521
WINTERS
$110.99Track performance hinges on dialing in the right gear ratios for your specific racing conditions—too tall and you lose acceleration, too short and you're leaving top-end speed on the table. The Winters 8500 Series Quick Change Gear Set gives you two...WIN8521- SKU:
- WIN8521
- Availability:
- Ships Same Business Day
- Weight:
- 6.75 LBS
- MFG Part #:
- 8521
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 5.36 3.17 4.86 6.31 3.74 Steel WIN8520A
WINTERS
$110.99If you're running a quick change rear end on the track, gear selection directly impacts your acceleration, top speed, and overall lap times. The Winters 8500 Series gives you the flexibility to dial in your ratios for different tracks and conditions...WIN8520A- SKU:
- WIN8520A
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- MFG Part #:
- 8520A
$110.99Qty in Cart: 0Quantity:Price:$110.99Subtotal: -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 Ratio 5.36 3.17 4.86 Ratio 6.31 3.74 WIN8520
WINTERS
$110.99Quick-change rear ends demand gear sets engineered for rapid ratio swaps without breaking down under load—the Winters 8500 Series delivers exactly that. With four selectable ratios spanning 3.17 to 6.31, you can dial in the perfect final drive for...WIN8520- SKU:
- WIN8520
- Availability:
- Ships Same Business Day
- Weight:
- 6.53 LBS
- MFG Part #:
- 8520
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 Ratio 4.91 3.46 4.86 Ratio 5.78 4.08 Steel WIN8519
WINTERS
$110.99Quick change gear sets are essential for racers who need to optimize performance across different track conditions and race formats without breaking down the entire rear end. The Winters 8500 Series delivers four distinct ratio options in a single set,...WIN8519- SKU:
- WIN8519
- Availability:
- Ships Same Business Day
- Weight:
- 6.47 LBS
- MFG Part #:
- 8519
$110.99 -
Winters Quick Change Gear Set 18A 10 Spline 4.12 Ratio 5.24 3.24 4.86 Ratio 6.18 3.82 WIN8518A
WINTERS
$110.99If you're serious about drag racing or bracket competition, gear ratio selection can mean the difference between winning and watching from the pits. The Winters 18A Quick Change Gear Set gives you four proven ratio combinations in a single, easy-to-swap...WIN8518A- SKU:
- WIN8518A
- Availability:
- Ships Same Business Day
- Weight:
- 6.52 LBS
- MFG Part #:
- 8518A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 1-3/8" Steel 4.12 5.20/3.27 4.86 6.12/3.85 WIN8518
WINTERS
$110.99The Winters 8500 Series Quick Change Gear Set 18 gives you the flexibility to dial in the exact gear ratios your racing conditions demand—without swapping out the entire differential. With four distinct ratio combinations built into a single set, you can...WIN8518- SKU:
- WIN8518
- Availability:
- Ships Same Business Day
- Weight:
- 6.50 LBS
- MFG Part #:
- 8518
$110.99Qty in Cart: 0Quantity:Price:$110.99Subtotal: -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 Ratio 4.81 3.53 4.86 Ratio 5.67 4.17 Steel WIN8517A
WINTERS
$110.99Track performance hinges on selecting the right gear ratios for your racing conditions, and the Winters 8500 Series Quick Change Gear Set delivers that flexibility without the downtime. With four distinct ratio options—4.12, 4.81, 3.53, 4.86, 5.67, and 4...WIN8517A- SKU:
- WIN8517A
- Availability:
- Ships Same Business Day
- Weight:
- 6.44 LBS
- MFG Part #:
- 8517A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.75 3.57 4.86 5.60 4.21 Steel WIN8517
WINTERS
$110.99Track performance hinges on dialing in the right gear ratio for your specific racing conditions—and swapping ratios shouldn't require hours of downtime. The Winters 8500 Series Quick Change Gear Set delivers four distinct ratios in a single 10-spline...WIN8517- SKU:
- WIN8517
- Availability:
- Ships Same Business Day
- Weight:
- 6.49 LBS
- MFG Part #:
- 8517
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.86 Steel WIN8516
WINTERS
$110.99When track conditions change, your gear ratios need to change with them—and downtime costs you races. The Winters 8500 Series Quick Change Gear Set eliminates the hassle of pulling your differential apart, letting you swap ratios in minutes instead of...WIN8516- SKU:
- WIN8516
- Availability:
- Ships Same Business Day
- Weight:
- 6.55 LBS
- MFG Part #:
- 8516
$110.99 -
Winters Quick Change Gear Set 10 Spline 4.12 4.34 3.91 4.86 5.11 4.62 WIN8515A
WINTERS
$110.99If you're running a Winters 8500 Series quick change rear end, having multiple gear ratio options on hand is essential for dialing in performance across different track conditions and racing formats. This gear set eliminates the need to source ratios...WIN8515A- SKU:
- WIN8515A
- Availability:
- Ships Same Business Day
- Weight:
- 6.45 LBS
- MFG Part #:
- 8515A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.34 3.91 4.86 5.11 4.62 Steel WIN8515
WINTERS
$110.99Quick gear changes can mean the difference between a winning run and a costly mistake on the track. The Winters 8500 Series Set 15 delivers the versatility you need to dial in your setup for different racing conditions—whether you're hitting the strip,...WIN8515- SKU:
- WIN8515
- Availability:
- Ships Same Business Day
- Weight:
- 6.43 LBS
- MFG Part #:
- 8515
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 5.77 2.94 4.86 6.80 3.47 WIN8514A
WINTERS
$110.99Quick change gear sets are essential for racers who demand flexibility without breaking down their entire rear end between sessions. The Winters 8500 Series delivers multiple ratio options in a single package, letting you optimize acceleration and...WIN8514A- SKU:
- WIN8514A
- Availability:
- Ships Same Business Day
- Weight:
- 6.65 LBS
- MFG Part #:
- 8514A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.86 Steel WIN8514
WINTERS
$110.99Quick-change gear sets are essential for serious racers who need to dial in their vehicle's performance between rounds or test sessions without breaking down the entire rear end. The Winters 8500 Series gives you two proven ratio options—4.12 for...WIN8514- SKU:
- WIN8514
- Availability:
- Ships Same Business Day
- Weight:
- 6.63 LBS
- MFG Part #:
- 8514
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 5.15 3.30 4.86 6.07 3.89 Steel WIN8513
WINTERS
$110.99If you're running a high-performance racing program, your gear selection directly impacts acceleration, top-end speed, and overall drivability across different track conditions. The Winters 8500 Series Quick Change Gear Set eliminates the guesswork by...WIN8513- SKU:
- WIN8513
- Availability:
- Ships Same Business Day
- Weight:
- 6.50 LBS
- MFG Part #:
- 8513
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 Ratio 4.60 3.69 4.86 Ratio 5.42 4.36 Steel WIN8512
WINTERS
$110.99If you're serious about optimizing your quick change rear end setup, selecting the right gear ratio is non-negotiable—it directly impacts acceleration, top speed, and overall lap consistency. The Winters 8500 Series Set 12 gives you the flexibility to...WIN8512- SKU:
- WIN8512
- Availability:
- Ships Same Business Day
- Weight:
- 6.42 LBS
- MFG Part #:
- 8512
$110.99 -
Winters Quick Change Gear Set 10 Spline 22/27 Teeth 4.12 Ratio 5.06/3.36 4.86 Ratio 5.96/3.96 WIN8511
WINTERS
$110.99Track performance hinges on precise gear selection, and mid-race changes shouldn't cost you time or reliability. The Winters WIN8511 Quick Change Gear Set eliminates guesswork with dual ratio configurations, letting you dial in your final drive for any...WIN8511- SKU:
- WIN8511
- Availability:
- Ships Same Business Day
- Weight:
- 6.50 LBS
- MFG Part #:
- 8511
$110.99 -
Winters Quick Change Gear Set 10A 10 Spline 22/30 Teeth 8500 Series WIN8510A
WINTERS
$110.99If you're running a 10-spline differential in a high-performance racing setup, gear ratio changes are critical to dialing in your performance across different tracks and conditions. The Winters 8510A Quick Change Gear Set eliminates the need for complete...WIN8510A- SKU:
- WIN8510A
- Availability:
- Ships Same Business Day
- Weight:
- 6.57 LBS
- MFG Part #:
- 8510A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 Ratio 5.57 3.05 4.86 Ratio 6.57 3.59 Steel WIN8510
WINTERS
$110.99Quick change gear sets are essential for racers who need to dial in their rear end for different track conditions without swapping entire assemblies. The Winters 8500 Series gives you two proven ratios—4.12 and 4.86—letting you optimize acceleration or...WIN8510- SKU:
- WIN8510
- Availability:
- Ships Same Business Day
- Weight:
- 6.62 LBS
- MFG Part #:
- 8510
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.94 3.43 4.86 5.83 4.05 WIN8509A
WINTERS
$110.99Quick-change rear ends demand precise gear ratios to extract maximum performance from your setup—and this Winters gear set gives you the flexibility to dial in the perfect combination for your specific track and racing discipline. With five distinct...WIN8509A- SKU:
- WIN8509A
- Availability:
- Ships Same Business Day
- Weight:
- 6.50 LBS
- MFG Part #:
- 8509A
$110.99 -
Winters Quick Change Gear Set 8500 Series 10 Spline 4.12 4.99 3.40 4.86 5.88 4.02 Steel WIN8509
WINTERS
$110.99Winters Quick Change gear sets eliminate downtime between races by letting you swap ratios in minutes rather than hours. Whether you're fine-tuning for track conditions or running multiple events, this steel-constructed Set 9 delivers the gear options...WIN8509- SKU:
- WIN8509
- Availability:
- Ships Same Business Day
- Weight:
- 6.47 LBS
- MFG Part #:
- 8509
$110.99
