September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- Burnt converter
- Bushing walks out
- Case damage
- Clutch failure
- Band failure
- Solenoid performance codes
- Broken parts due to excessive line pressure
- Buzzing noise
- Metal contamination
- Output shaft & case damage
- High line pressure
- Uncontrollable line rise
- 2-3 Neutral
- 3-4 Neutral
- No 4th
- 2nd Gear starts
- Wrong gear starts
- Converter shudder
- TCC apply & release concerns
- TCC slip codes
Cause:
Loss of oil pressure due to worn components in critical oil circuits and/or lube related failure.Correction:
The parts in this Sure Cure kit repair and restore key areas most prone to TCC-related transmission problems and other issues affecting shift quality.4L80-E, 4L85-E
The Sure Cure® Kit
Part No. SC-4L80E
-
Tooling:
- 77754-TL
View Instructions Find a Distributor
Sonnax Sure Cure kit SC-4L80E, fully compatible with '91-later GM 4L80-E and 4L85-E units, is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance. Sure Cure components are the same Sonnax parts sold individually to resolve common valve body complaints as well as other transmission problems. The high-quality Sonnax parts in each Sure Cure kit repair worn areas and protect the transmission against future damage. Plus, each kit comes with easy-to-read, step-by-step installation guide that covers the inspection and repair of the most critical areas of the valve body.
- Restore shift quality and reduce comebacks
- Repairs biggest trouble areas to reduce comebacks
- Includes step-by-step instructions for comprehensive valve/pump body restoration
- Get everything you need for restoring troublesome units in one place, at one cost
- Stator Support Bushing
- O-Ringed End Plugs Small
- O-Ringed End Plugs (2) Medium
- O-Ringed End Plugs Large
- Boost Valve Kit
- Actuator Feed Limit Valve Kit
- TCC Regulator Valve Kit
- 1-2 Shift Valve Spring
- 2-3 Shift Valve Spring
- Case Bushing
- Endplay Shim
- Endplay Washer
- Checkballs (8)
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
GM 4L80-E, 4L85-E, TH400 Valve Body Layout
-
Patent
- 6,634,377
The Sure Cure®
Comprehensive Kit for Big Problems You Don't Want Back
Knowing exactly what parts to replace in troublesome transmissions is an ever-increasing challenge, but Sonnax Sure Cure kits solve this problem for you. Each kit is a comprehensive reconditioning package featuring the best Sonnax products developed to help rebuilders restore and enhance transmission performance.
Related Sonnax Parts
Required
Recommended
4L80-E, 4L85-E
1-2 & 2-3 Shift Valve Spring Kit 34994-02K
-
Helps cure:
- Repeated Solenoid B code 86
- Repeated Solenoid B code 87
- 2nd Gear starts
- No 4th
- 3-4 Neutral
- No 3rd
Required
Recommended
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, TH400
Case Bushing 34006-SP
- Material: Bronze
- Bushing Style: Precision
- Width: 0.630"
- Shaft Dia.: 2.006"
- Housing Bore: 2.129"
-
Helps cure:
- Bushing walks out
Required
Recommended
200-4R, 32RH, 45RFE, 46RE, 46RH, 47RE, 48RE, 4L60, 4L60-E, 4L65-E, 4L70-E, 4L80-E, 4L85-E, 4R100, 4R44E, 4R55E, 4R70E, 4R70W, 4R75E, 4R75W, 4T60-E, 4T65-E, 545RFE, 5R44E, 5R55E, 60-40LE, 60-41SN, 65RFE, 66RFE, 68RFE, 6F35 (Gen. 1), 6F35 (Gen. 2), 6F35 (Gen. 3), 6F50, 6F55, 6L45, 6L50, 6L80, 6L90, 6T30 (Gen. 1), 6T30 (Gen. 2), 6T40 (Gen. 1), 6T40 (Gen. 2), 6T45 (Gen. 1), 6T45 (Gen. 2), 6T50 (Gen. 1), 6T50 (Gen. 2), 6T70 (Gen. 1), 6T75 (Gen. 1), A340E, A340F, AODE, E4OD, TH200, TH200C, TH400, TH425
Checkball 10000-08
- Material: Imidized Plastic
- Dia.: 0.250"
-
Helps cure:
- Lost or damaged component
Required
Recommended
4L80-E, 4L85-E, TH400
Forward Clutch Hub Washer (Rear) 34301-078
- Material: Steel
- Thickness: 0.078"
- Outer Dia.: 1.780"
- Inner Dia.: 1.405"
-
Helps cure:
- Excess front endplay
- Forward clutch & sealing ring failure
- Reduced bearing, thrust washer & sealing ring life
Required
Recommended
4L80-E, 4L85-E, TH400
Front/Rear Unit Endplay Shim 34500-Z
Updated 3-tang style shim fits all units, including '97-later 4L80-E and 4L85-E units.
- Material: Steel
- Tang Count: 3
- Inner Dia.: 1.165"
- Thickness: 0.010"
- Outer Dia.: 1.940"
-
Helps cure:
- Excess front endplay
- Excess rear endplay
- Burnt Forward clutch
- Premature seal ring failure
Required
Recommended
4L80-E, 4L85-E
Stator Support Bushing 34016-W
- Bushing Style: Precision
- Material: Steel-backed bimetal
- Width: 0.675"
- Shaft Dia.: 1.123"
- Housing Bore: 1.244"
-
Helps cure:
- TCC slip codes
- No lockup
- Overheated fluid
- No Overdrive
