Medium
1-2 hours
This authentic item is supplied directly from the original equipment manufacturer for use with lawn mowers made by Toro and Lawn Boy. The transmission is made of metal and attaches to the bearing ball and the pivot bracket. When replacing this part a screwdriver, a set of pliers, a socket set, and a wrench set, may all be needed. This part is priced individually.
Transmission Asm 106-3956
OEM part for: Toro, Lawn Boy
Part Number: 106-3956
$119.55
In Stock
Order within the next 9 hours and your part ships today! 
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Compatibility
This part will fit the following 61 machines
Toro
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20655 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
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20656 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20656 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
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20656 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20656 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20656 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20658 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20658 (290000001-290999999)(2009) Lawn Mower View Diagrams & Manuals
Lawn Boy
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10656 (240000001-240999999)(2004) Gold Series Lawnmower View Diagrams & Manuals
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This item works with the following types of products:
- Lawn Mower Parts
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Fast service good parts
Parts fit great
Guest -
January 23, 2023
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My repair man said all parts went together very easily
Guest -
August 16, 2022
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works great. no left over parts.
Works great.
Guest -
September 11, 2019
Verified Purchase
Transmission
The part came in appropriate packaging . It fit perfectly. Mower runs like new
Guest -
July 15, 2019
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Rear drive transmission was grinding and slipping
Anson - April 13, 2016
👍 23 of 24 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Scraper, Camera
Place the mower on a pair of work stands so the the wheels are free to spin.
(I took pictures of all assemblies prior to removing for reassembly reference)
Remove the spark plug for safety.
Remove the blade from underneath using a socket or wrench.
Remove drive belt guard bolts from underneath and on top, remove guard.
Remove the mulching door assembly from the mower deck.
Remove plastic grass clipping shield from the back of mower.
Remove the rear wheel assemblies using a socket.
Disassemble the rear drive gears from the axles, (Take pictures!) retaining all clips and shims in correct order. Drive gears are marked with an "R" on one side and are reversed from left and right side. Note the direction of free rotation and locked rotation!
Capture the ratchet pawl and spring from the axle as the gear is slid off.
Clean and re-grease all parts.
Remove 3 bolts each side that hold the rear drive axle side plates and slide off.
Lower the drive transmission/axle assembly and remove the metal belt retainer bolts from the transmission case after removing the torque spring. Remove belt and pull the transmission off of mower.
The tricky part now is to remove the pulley from the old transmission drive pinion. Its a self-locking nut and there is no easy place to grab the shaft to keep it from turning as the nut is removed. I removed the gearbox cover and held the drive gear.
Reverse the assembly procedure after cleaning and re-greasing all components.
This is also a great time to change oil, air filter and grease the front wheel axles.
(I took pictures of all assemblies prior to removing for reassembly reference)
Remove the spark plug for safety.
Remove the blade from underneath using a socket or wrench.
Remove drive belt guard bolts from underneath and on top, remove guard.
Remove the mulching door assembly from the mower deck.
Remove plastic grass clipping shield from the back of mower.
Remove the rear wheel assemblies using a socket.
Disassemble the rear drive gears from the axles, (Take pictures!) retaining all clips and shims in correct order. Drive gears are marked with an "R" on one side and are reversed from left and right side. Note the direction of free rotation and locked rotation!
Capture the ratchet pawl and spring from the axle as the gear is slid off.
Clean and re-grease all parts.
Remove 3 bolts each side that hold the rear drive axle side plates and slide off.
Lower the drive transmission/axle assembly and remove the metal belt retainer bolts from the transmission case after removing the torque spring. Remove belt and pull the transmission off of mower.
The tricky part now is to remove the pulley from the old transmission drive pinion. Its a self-locking nut and there is no easy place to grab the shaft to keep it from turning as the nut is removed. I removed the gearbox cover and held the drive gear.
Reverse the assembly procedure after cleaning and re-greasing all components.
This is also a great time to change oil, air filter and grease the front wheel axles.
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Transmission was stripped and made a grinding sound when being pushed.
Rick - August 22, 2016
👍 5 of 7 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Power Drill, Socket set, Wrench Set, Impact wrench
Remove old axle assy. remove and install rear wheels on the correct side being sure to take a picture of the order of washers and thrust washers. You have to be sure to get the slip parts in the wheels on the right side. The biggest problem I encountered was a bolt broke on the belt guide. This is also one of the bolts securing the engine to the frame.Tried several eze-outs and managed to break a couple. Finally went ahead and drilled the hole out and installed a 3/8 bolt with a nylon lock nut. Start and test ran mower. Trans worked as designed.
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rear wheel drive was worn out. needed new drive gears on rear wheels
David - November 10, 2020
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, snap ring pliers
R & R rear drive axle assembly,replaced drive sprockets on rear wheels both sides
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did get all the parts i needed
JIMPSEY - May 2, 2020
Tool Type
Lawn Mower
Difficulty
Hard
Time
More than 2 hours
Tools Used
Pliers, Socket set
Parts Used
need to fix on when someone like me orders parts and might give a hint you might need this part too
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Self propel did not work
Claude - June 5, 2017
Tool Type
Lawn Mower
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver, Hammer, Vise
Parts Used
Removed the belt guard
Removed the blade
Removed the belt pulley and belt
Removed the wheels
Removed wheel gears
Removed wheel adjustment mount bolts
Removed transmission guard
Removed rear discharge door
Removed spring from tension cable
Removed transmission
Changed over transmission pulley
Replaced transmission
Assembled in reverse order
Removed the blade
Removed the belt pulley and belt
Removed the wheels
Removed wheel gears
Removed wheel adjustment mount bolts
Removed transmission guard
Removed rear discharge door
Removed spring from tension cable
Removed transmission
Changed over transmission pulley
Replaced transmission
Assembled in reverse order
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Transmission gears stripped.
Joyce - June 15, 2017
👍 0 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Power Drill, Socket set, Wrench Set, Nutdriver, Adjustable Wrench
Parts Used
1. Removed the old transmission assembly.
2. Cleaned the parts and the mower.
3. Reassembled with new parts.
2. Cleaned the parts and the mower.
3. Reassembled with new parts.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
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