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HOMESERVICE MANUALSCHEVROLET2001SUBURBAN C1500REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 7 (AUTOMATIC TRANSMISSION - 4L80-E - UNIT REPAIR OVERHAUL)SPECIFICATIONSTRANSMISSION GENERAL SPECIFICATIONS (UNIT REPAIR)
2001 Chevrolet Suburban C1500

Transmission General Specifications (Unit Repair)

2001 Chevrolet Suburban C1500SECTION Transmission General Specifications (Unit Repair)
WARNING: This page is about a different variant/trim than selected.
Transmission General Specifications (Unit Repair)

Specification Specification
Metric English
Direct Clutch Piston Travel Specification 1.27-4.369 mm 0.050-0.172 in
Intermediate Clutch Piston Travel Specification 1.02-2.72 mm 0.040-0.107 in
Forward Clutch Piston Travel Specification 1.27-4.369 mm 0.050-0.172 in
Overrun Clutch Piston Travel Specification 0.838-2.38 mm 0.033-0.094 in
Fourth Clutch Piston Travel Specification 1.016-2.540 mm 0.040-0.100 in

Low and Reverse Band Servo Piston Pin Specification Chart 

Refer to the chart in order to determine the correct low and reverse band servo pin length to use. A, B and C on the chart refer to markings on the J 21370-10 Band Apply Pin Gauge. Numbers 1-7 match the correct piston pin length to the J 21370-10 land indicated by the low and reverse band servo pin inspection procedure.

Fig 1: Low and Reverse Band Servo Piston Pin Specification Chart
GM28391Courtesy of GENERAL MOTORS COMPANY
Servo Piston Pin Selection

Pin Length Pin Identification
mm inch
83.82-83.97 3.300-3.306 1
84.53-84.68 3.328-3.334 2
85.24-85.39 3.356-3.362 3
85.95-86.10 3.384-3.390 4
86.66-87.53 3.412-3.446 5
87.38-87.53 3.440-3.446 6
88.09-88.24 3.468-3.474 7
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.