ZF8HP55 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
Related Parts
Required
Recommended
6F35 (Gen. 1), 6F35 (Gen. 2), 6F35 (Gen. 3), 6R100, 6R140, 6R60, 6R75, 6R80 (2009–2014), 6R80 (2015-Later), 845RE, CFT30, ZF6HP19, ZF6HP21, ZF6HP26, ZF6HP28, ZF6HP32, ZF6HP34, ZF8HP45, ZF8HP55, ZF8HP70
Accumulator Piston Kit 95740-15K
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized Pressure Regulator Valve Kit 35740-01K
ZF valve name: SYS-DR, Chrysler valve name: LP-V
-
Helps cure:
- Harsh shifts
- Soft shifts
- Erratic line pressure
- High line pressure
- Burnt clutches
- Restricted converter/lube flow
- Broken parts due to excessive line pressure
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized B2 Clutch NIC Valve 35740-22
ZF valve name: KV-B2
Chrysler valve name: CV-B2
-
Helps cure:
- Delayed engagement
- No Forward
- NIC (Neutral Idle Control) concerns
- Gear ratio & solenoid codes
- No Reverse
- B Clutch burned
- Flare shifts
- Harsh shifts
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized TC Switch Valve 35740-05
ZF valve name: SV-WD
Chrysler valve name: SV-TC
-
Helps cure:
- No lockup
- No TCC release
- Engine stall
- TCC codes
- Excess TCC slip
- Premature TCC apply
- Soft TCC apply
- Harsh TCC apply
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized TC Pressure Valve Kit 35740-18K
ZF valve name: WD-V
Chrysler valve name: TC-V
-
Helps cure:
- Coastdown clunk
- Harsh TCC apply
- Excess TCC slip
- TCC codes & overheating
- TCC lining failure
- Low lube oil flow
- Low TCC release pressure
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized TCC Valve Kit 35740-13K
ZF valve name: WK-V
Chrysler valve name: TCC-V
-
Helps cure:
- Converter shudder & TCC slip
- Damaged TCC linings
- TCC codes
- Overheated converter
- Poor fuel economy
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized Clutch Holding Valve Kit 35740-20K
Fits five separate locations. Clutch holding valve locations HV-C and HV-E use an end plug, the HV-A, HV-D and HV-B1 locations do not.
-
Helps cure:
- Bump shifts
- Burnt clutches
- Flare shifts
- Gear loss
- Gear ratio & solenoid codes
Required
Recommended
845RE, ZF8HP45, ZF8HP55, ZF8HP70
Oversized Priming Valve Kit 35740-21K
ZF valve name: DR-RED-V (DR-V)
Chrysler valve name: PR-V
-
Helps cure:
- Delayed engagement
- Wrong gear starts
- Flare shifts
- Gear ratio & solenoid codes
- Harsh shifts
- Neutral shifts
- Gear loss
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