Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987S10/T10 P/U 2WD L4-151 2.5LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - 700R4 MISSING REVERSE CHECKBALL
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5L
A/T - 700R4 Missing Reverse Checkball
1987 Chevrolet S10/T10 P/U 2WD L4-151 2.5LSECTION A/T - 700R4 Missing Reverse Checkball
BULLETIN NO: 257
TRANSMISSION: 4L60/700-R4
SUBJECT: Missing Reverse Checkball
APPLICATION: GM
It is not uncommon to find that the checkball in the reverse brake circuit has fallen out (figure one). The checkball was introduced in 1987. It is not imperative that the checkball (or capsule) be in place. If the checkball has fallen out of the capsule, you can either replace the capsule (GM part number 8663890), leave the checkball out or remove the capsule.
Note
Not all 1987 and later 4L60s use the checkball capsule.
TRANSMISSION: 4L60/700-R4
SUBJECT: Missing Reverse Checkball
APPLICATION: GM
It is not uncommon to find that the checkball in the reverse brake circuit has fallen out (figure one). The checkball was introduced in 1987. It is not imperative that the checkball (or capsule) be in place. If the checkball has fallen out of the capsule, you can either replace the capsule (GM part number 8663890), leave the checkball out or remove the capsule.
Note
Not all 1987 and later 4L60s use the checkball capsule.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.