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TRX-3973 Traxxas Gear Set, Close Ratio 2-Speed (21T / 18T Input) (Legacy)
SKU 3973
$6.00
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Discontinued close-ratio 2-speed gear set for Traxxas nitro vehicles
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TRX-3973 Traxxas Gear Set, Close Ratio 2-Speed (21T / 18T Input) (Legacy)
Product Details
UPC: 020334397300
Brand: TRX - Traxxas
Tags: 3973, TRA3973, TRX-3973, Traxxas gear set, close ratio gear set, 2-speed gear set, 21T gear, 18T input gear, two speed transmission, legacy
The 3973 is the close-ratio 2-speed gear set for Traxxas nitro vehicles equipped with a 2-speed transmission — a 21-tooth first speed gear and 18-tooth input gear. Close-ratio gearing reduces the RPM jump between first and second gear for smoother, more seamless shifts. This part is discontinued — no longer in production. Stock on hand only.
Browse RC Parts & Supplies at JackWagon R/C & Hobbies
What’s Included
- (1×) 21-tooth 1st speed gear
- (1×) 18-tooth input gear
Fitment Note
Fits many Traxxas nitro vehicles with a 2-speed transmission. Consult your vehicle’s manual or parts diagram to verify fitment before ordering.
Key Features
- Close-ratio 2-speed gear set — tighter RPM spread between 1st and 2nd for smoother shifts
- 21T first speed gear / 18T input gear
- Counterpart to the wide-ratio set (3974) — consult your manual for the appropriate option for your driving style
Frequently Asked Questions
- What’s the difference between close-ratio and wide-ratio gearing?
- Close-ratio gearing (3973) keeps the engine RPM closer together between gear shifts for a smoother, more linear power delivery. Wide-ratio gearing (3974) increases the spread between gears for a bigger top-speed jump. Your vehicle’s manual will indicate which is appropriate.
- Is this part still in production?
- No. The 3973 is discontinued with no current direct replacement. Available only while current stock lasts.
- Can I order online and pick up in Greeley?
- Yes — shop online and ship to your door, or choose in-store pickup at JackWagon R/C & Hobbies in Greeley, CO.
Reference Numbers
Traxxas PN: 3973 · Retailer PN: TRA3973 · JackWagon SKU: TRX-3973
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