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Dave Nova
Dave Nova, ASE Certified Tech
Category: Transmissions
Satisfied Customers: 19452
Experience:  ASE Master Certification. 25 yrs experience
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4l60e transmission from a stop t the gas real hard made a

Customer Question

4l60e transmission from a stop hit the gas real hard made a loud noise no drive or third drove home would move to 3rd or 4th if I put it there manualy then pop out replaced transmission tore old one apart cannot find any damage did not test soledoids yet
Submitted: 1 year ago.
Category: Transmissions
Expert:  Dave Nova replied 1 year ago.

The problem is not in the solenoids or any of the hydraulically applied clutch packs. The problem is in the one way sprag clutch. This is a mechanical clutch that holds in one direction but free wheels in the other direction. This is called the input sprag or forward sprag. When launching hard with one of these transmissions, it is advisable to put transmission shifter in manual Low 1 range. There is another hydraulic clutch that applies over the sprag clutch for additional holding power (also gives engine braking in Low 1 range)