What is a Sprag in a 4L60E transmission?

A sprag is a one-way mechanical clutch used in many automatic transmissions as a method of allowing the transmission to smoothly change gears under load. Our sprag profiles are designed to reduce drag and create less wear.

What does the forward Sprag do?

A sprag clutch is used in some automatic transmissions as a method of allowing the transmission to change gears smoothly under load. In a Simpson planetary gearset, common to many automatic transmissions, this happens on the 1-2 shift, and reverses on the 2-1 downshift.

How many check balls in a 4L60E?

Check ball locations in GM’s 4L60E transmission valve bodies. There are a total of 7 check balls used in valve bodies 1993-2007.

How do I know if my sprag clutch is bad?

The sprag clutch is on the starter. If that goes you get a graunching noise or a nasty metalic bang when you hit the starter then the second time you hit the button the starter just spins without engaging the motor.

How does a Sprag work?

A sprag clutch has cam-shaped steel wedges (or sprags) that are placed at an angle and controls the one-way direction of movement. When the movement tries to go in the opposite direction an instant driving disengagement or locking occurs.

What is the function of the Sprag on a sprag clutch?

How long does it take to rebuild a 4l60e transmission?

Someone has to know the exact condition of your car to answer this question. The estimated time is about 8 hours. To rebuild the transmission is an additional 6 hours.

Can a stock 4L60E handle 500hp?

A well built 4l60e can handle some serious power. We have cars running 500-600 and 700 rwhp as the power increases of course the odds of failure do increase but we have had very good results. Generally a stock rebuild is not adequate for much more than general bolt ons however.

How does a sprag clutch fail?

The cause of sprag failure is most likely due to low battery starts. Other factors can hasten sprag failure, including: Starting without the choke, Starting in gear, using an oil of too low viscosity(the lower the viscosity = a higher viscosity number /// 80w is less viscous than 20w).

What are the most common 4L60E transmission problems?

No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. Transmission must be removed and rebuilt. Try not to run or drive the car or further damage could result. 18. Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed.

How much fluid does a GM 4L60E need?

The 4L60E transmission weighs 146 pounds dry, and 162 wet. It requires 8.4 quarts (9.64″ torque converter) or 11.4 quarts (11.81″ torque converter) of transmission fluid, Below is a list of common transmission problems with the GM 4L60E Transmission and possible solutions to repair.

What causes a WoT Shudder on a 4L60E?

3. 1-2 Shift shudder at WOT (Wide Open Throttle); delayed or abnormal 1-2 shift; There’s a problem ONLY on the 1-2 shift: 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accum housing for breakage.

Where can I find THM 4L60-E index?

INTRODUCTION THM 4L60-E. 1 No part of any ATSG publication may be reproduced, stored in any retrieval system or transmitted in any form or by any means, including but not limited to electronic, mechanical, photocopying, recording or otherwise, without written permission of Automatic Transmission Service Group.