Tech Resources Transmission Article GM Vacuum Test Guides Vacuum Testing
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February 21, 2013
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GM 4L80-E Vacuum Test Guide

Vacuum testing is an efficient way to identify the root cause of transmission problems and evaluate the effectiveness of repairs. Frequent, proper vacuum testing can put money in the bank, improve turnaround time in your bays, and prevent costly comebacks.

See how easy it is to master vacuum testing and work with confidence knowing your rebuild is done right the first time.


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Related Units

4L80-E Transmission 4L85-E Transmission


Related Parts

Required

Recommended

4L80-E, 4L85-E Boost Valve Kit 34200-01K

4L80-E, 4L85-E

Boost Valve Kit 34200-01K

O-Ring style. Kit can be retrofit to back to '89 units. See instructions for details.

    Helps cure:
  • Uncontrollable line rise
  • High line pressure
  • Broken parts
  • Broken clutch piston

Required

Recommended

4L80-E, 4L85-E Boost Valve Kit 34200-03K

4L80-E, 4L85-E

Boost Valve Kit 34200-03K

Fits '91-later units with factory-style sleeve, no O-rings. Can be retrofitted to '89–91 units. See instructions for details.

    Helps cure:
  • Uncontrollable line rise
  • High line pressure
  • Broken parts
  • Broken clutch piston

Required

Recommended

4L80-E, 4L85-E O-Ringed End Plug Kit 34200-05K

4L80-E, 4L85-E

O-Ringed End Plug Kit 34200-05K

TCC & PR Valves

  • Dia.: 0.625"
    Helps cure:
  • Pressure loss
  • TCC apply concerns
  • Burnt clutches
  • Harsh shifts
  • Soft shifts

Required

Recommended

4L80-E, 4L85-E Boost Valve Kit 34200-10K

4L80-E, 4L85-E

Boost Valve Kit 34200-10K

With encapsulated relief valve. O-Ring style

    Helps cure:
  • Uncontrollable line rise
  • High line pressure
  • Broken parts
  • Broken clutch piston

Required

Recommended

4L80-E, 4L85-E Lube Regulated Pressure Regulator Valve 34200-14K

4L80-E, 4L85-E

Lube Regulated Pressure Regulator Valve 34200-14K

    Helps cure:
  • Engine surge at idle
  • Low cooler flow
  • Low TCC release pressure

Required

Recommended

4L80-E, 4L85-E Actuator Feed Limit Valve Kit 34200-16K

4L80-E, 4L85-E

Actuator Feed Limit Valve Kit 34200-16K

    Helps cure:
  • Wrong gear starts
  • Clutch failure
  • Solenoid performance codes
  • No 4th
  • Band failure
  • Low solenoid feed pressure
  • 2-3 Neutral
  • 2nd Gear starts
  • Code 68, 85, 86, 87

Required

Recommended

4L80-E, 4L85-E TCC Regulator Valve Kit 34994-01K

4L80-E, 4L85-E

TCC Regulator Valve Kit 34994-01K

    Helps cure:
  • TCC codes
  • TCC apply & release concerns
  • Converter shudder
  • Burnt converter

Required

Recommended

4L80-E, 4L85-E O-Ringed End Plug Kit 34994-13

4L80-E, 4L85-E

O-Ringed End Plug Kit 34994-13

Fits TCC shift valve bore with .497" dia.

    Helps cure:
  • No converter apply
  • Burnt converter

Required

Recommended

4L80-E, 4L85-E O-Ringed End Plug Kit 34994-14K

4L80-E, 4L85-E

O-Ringed End Plug Kit 34994-14K

Fits .668" dia. TCC valve bores.

    Helps cure:
  • No converter apply

Required

Recommended

4L80-E, 4L85-E AFL Filter End Plug & O-Ring Kit 34994-17K

4L80-E, 4L85-E

AFL Filter End Plug & O-Ring Kit 34994-17K

    Helps cure:
  • Broken AFL filters
  • 2nd Gear starts
  • Leaking AFL end plug
  • Code 68, 85, 86, 87
  • No upshifts

Required

Recommended

4L80-E, 4L85-E Oversized TCC Regulator Valve Kit 34994-18K

4L80-E, 4L85-E

Oversized TCC Regulator Valve Kit 34994-18K

    Helps cure:
  • TCC codes
  • TCC apply & release concerns
  • Converter shudder
  • Burnt converter

Required

Recommended

4L80-E, 4L85-E Oversized Accumulator Control Valve Kit 34994-22K

4L80-E, 4L85-E

Oversized Accumulator Control Valve Kit 34994-22K

    Helps cure:
  • Soft shift & low accumulator pressure
  • High line pressure in Drive
  • Low line rise in Reverse

Required

Recommended

4L80-E, 4L85-E Reverse Checkball Sleeve 34200-38

4L80-E, 4L85-E

Reverse Checkball Sleeve 34200-38

Fits units '95-later.

    Helps cure:
  • Reverse slip
  • Gear ratio codes
  • 3rd Slip
  • 4th Slip
  • Direct clutch burned
  • No Reverse

Required

Recommended

4L80-E, 4L85-E 3rd & Reverse Checkball Sleeve Kit 34200-47K

4L80-E, 4L85-E

3rd & Reverse Checkball Sleeve Kit 34200-47K

Fits units '95-later.

    Helps cure:
  • 3rd Slip
  • 4th Slip
  • Gear ratio codes
  • Direct clutch burned
  • Reverse slip

Required

Recommended

4L80-E, 4L85-E #7 Low/Reverse Checkball Seat 34200-52

4L80-E, 4L85-E

#7 Low/Reverse Checkball Seat 34200-52

Fits '95-later units.

    Helps cure:
  • Burnt Reverse band
  • Delayed Reverse
  • No Reverse
  • No engine braking in manual low

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