SKU: 82831536681

ARRMA 39T MOD1 Spool Gear 8mm Bore ARA310951

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Description

ARRMA 39T MOD1 Spool Gear 8mm Bore ARA310951The ARRMA ARA310951 39T MOD1 Spool Gear is a steel 8mm bore drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing adjustable gearing and smooth power transfer. Features Gearing Tuning Option: Allows compatible ARRMA vehicles to be geared for different speed, acceleration, and driving conditions Strong Steel Construction: Durable steel material supports long service life in demanding RC use 39 Tooth Gear: 39T spool gear

The ARRMA ARA310951 39T MOD1 Spool Gear is a steel 8mm bore drivetrain tuning gear designed for compatible ARRMA spool shaft setups needing adjustable gearing and smooth power transfer.

Features

  • Gearing Tuning Option: Allows compatible ARRMA vehicles to be geared for different speed, acceleration, and driving conditions
  • Strong Steel Construction: Durable steel material supports long service life in demanding RC use
  • 39 Tooth Gear: 39T spool gear provides a lower gearing option compared with smaller tooth-count spool gears
  • MOD1 Tooth Profile: Precision manufactured MOD1 teeth help provide smooth operation with compatible drivetrain components
  • 8mm Bore Fitment: Designed to fit an 8mm diameter spool shaft
  • Secure Mounting Hardware: Includes set screw and screw pin hardware for secure installation on the spool shaft

Specifications

  • Brand: ARRMA
  • Part Number: ARA310951
  • Product Type: Spool gear
  • Tooth Count: 39T
  • Gear Pitch: MOD1
  • Bore Size: 8mm
  • Material: Steel
  • Hardware: M4 set screw and M4 screw pin included
  • Application: Compatible ARRMA spool shaft drivetrains using 8mm bore MOD1 spool gears
  • Intended Use: Gearing adjustment, drivetrain tuning, replacement, and speed setup work

Includes

  • 1 x ARRMA 39T MOD1 spool gear with 8mm bore
  • 1 x M4 x 4mm set screw
  • 1 x M4 screw pin

FAQ

What is the ARRMA ARA310951 spool gear used for? The ARRMA ARA310951 spool gear is used to fine tune gearing on compatible ARRMA spool shaft drivetrains using an 8mm bore MOD1 gear.

What bore size does this gear have? The ARRMA ARA310951 spool gear has an 8mm bore.

What tooth count is the ARRMA ARA310951 gear? The ARRMA ARA310951 spool gear has 39 teeth and a MOD1 tooth profile.

Does this gear include mounting hardware? Yes. The ARRMA ARA310951 gear includes one M4 x 4mm set screw and one M4 screw pin.

Will this fit every ARRMA vehicle? No. OZRC recommends checking your ARRMA vehicle manual or exploded diagram to confirm ARA310951 is the correct 8mm bore MOD1 spool gear before installation.

Important Notes

  • Designed for compatible ARRMA spool shaft setups using an 8mm bore MOD1 spool gear.
  • Check your vehicle manual, exploded diagram, motor shaft size, and gear mesh requirements before fitting.
  • This listing is for the spool gear and included mounting hardware only. Spool shaft, motor, pinion gear, bearings, and other drivetrain components are not included.
  • Changing gearing can affect motor temperature, ESC load, acceleration, and top speed. Monitor electronics temperatures after installation.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 82831536681

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clutz
Omaha, US
★★★★★ 1
Better than Honda Cabin Filter for Allergies -
Size: 8.3" x 9.3" x 1.3"
Installation took all of 3 minutes. Noticeable improvement in air quality (less allergy response) since installation. Others mentioned a reduction in air flow but have not noticed a change. ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Update (9/2020) Noticeable reduction in air flow. I have needed to increase the fan speed to make the cabin comfortable. I may be switching brands soon. I will pull the filter at 6 weeks and see if it is getting plugged (yikes). //////////// Update (10/2020) I pulled the Bosch filter expecting it to be plugged due to the lack of air flow. I was surprised to see it was clean. There were are few small pieces of stuff in the folds of the filter but only about 10 of them. I held the filter up to the light and then tapped it on white paper to see what would fall out. There was nothing present to explain the extreme loss of air flow. I have used Bosch cabin filters in my other vehicles (not HEPA) with great success. I was hoping to help the allergies of my family but having to run the fan on high to receive any airflow was more annoying than helpful. The noise was irritating and the air flow was still less than the Honda filter I removed. I purchased a new Honda cabin filter and our van is back to normal. I did not realize how much I missed the auto temperature setting. I was setting the temperature about 5 degrees below "normal" to try and keep the temperature consistent, and it was not during the hotter summer months. Unfortunately I am beyond the 30 day Amazon return window so I am not able to return the cabin air filter. :-( This is my first Amazon review that moved from 5 to 1.....
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Reviewed in the United States on August 18, 2020
J
Verified Purchase
Jim Russell
Waukegan, US
★★★★★ 5
Starter
Why did you pick this product vs others?: Good replacement. 
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Reviewed in the United States on June 20, 2025
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william
Lake Worth, US
★★★★★ 5
Starter works great
Fits and works great 2005 Mercury mariner 3.0
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Reviewed in the United States on August 29, 2025
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J G.
Bozeman, US
★★★★★ 5
Reliable part
The price of this item was a bit of a shock. A good one though. I gave it to my mechanic, he installed it with no problems. Runs just fine. Would buy again
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Reviewed in the United States on May 5, 2026
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Joel sulbaran
Omaha, US
★★★★★ 4
Entrega a tiempo
Exelente
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Reviewed in the United States on October 3, 2025

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