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42RH / 42RE 3-4 Accumulator Spring


Retail: $21.89
Our Price: $18.88
You Save: $3.01
In Stock
Our Number: S-12861-01
Manufacturer: Sonnax
Mfg Part # : 12861-01
free shipping
Sonnax 3-4 Accumulator Spring Update

This fits all below models of Chrysler /Dodge/Jeep Automatic Transmissions:


A500 / 42RH / 42RE / 44RE

This was created due to the high failure rates of the original OEM design. 

This Sonnax update will restore proper shift feel and eliminate sluggish overdrive engagement.

About 60%-70% of the factory springs were .063" thick spring stock.

This design is .126" Thick

It is extremely common for these to become worn out and fatigued even on moderate mileage units.
Most models that completely lose overdrive , have a broken 3-4 Accumulator Spring.

Sonnax spring is a duplicate of the 47-RE diesel application.

Helpful YouTube Video:




Symptoms this May Address:
Sluggish engagement of overdrive and poor shift quality.
When broken, there will be complete or intermittent loss of overdrive.
No 3rd to 4th shift

This is a suggested replacement every 50,000 miles during fluid service , and band adjustment.

This is sold as pictured 


Our Part #       S-12861-01

Sonnax part #    12861-01

We would appreciate the opportunity to serve your transmission parts needs ! ! !

Cascade Transmission Parts , Inc.
All Rights Reserved ®



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