Transmission Parts

Browse all Sonnax transmission parts here, or use the filters below to find just what you are looking for.

Find a Distributor

Looking for Part Instructions?

View Sonnax Part Instructions

Enter a Sonnax part number below to view its instructions. For general reaming instructions, click here.

Powerglide 10-Clutch Hub 28304-01

Powerglide

10-Clutch Hub 28304-01

With lightening holes

ZF6HP21, ZF6HP28, ZF6HP34 Oversized Solenoid Pressure Regulator Valve Kit 95740-64K

ZF6HP21 • ZF6HP28 • ZF6HP34

Oversized Solenoid Pressure Regulator Valve Kit 95740-64K

ZF valve name: DR.REO-V

Helps cure:

Delayed engagement
Flare shifts
Harsh downshifts
Neutral shifts
High line pressure
Harsh upshifts
Wrong gear starts
Gear ratio & solenoid codes
TCC slip

6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized AFL/Solenoid Pressure Regulator Valve 124740-01

6F50 • 6F55 • 6T70 (Gen. 1) • 6T75 (Gen. 1)

Oversized AFL/Solenoid Pressure Regulator Valve 124740-01

Helps cure:

Solenoid performance codes
Wrong gear starts
Clutch failure

TH400 Manual Shift Shaft Kit 38511-05K

TH400

Manual Shift Shaft Kit 38511-05K

Helps cure:

Lost or damaged component

U660E, U660F B1 Apply Boost Valve Kit 47740-19K

U660E • U660F

B1 Apply Boost Valve Kit 47740-19K

Helps cure:

2nd & 6th Gear shift concerns
B1 Clutches burned

U660E, U660F, U760E, U760F Lockup Control Boost Valve Kit 47740-06K

U660E • U660F • U760E • U760F

Lockup Control Boost Valve Kit 47740-06K

Helps cure:

TCC apply & release concerns
TCC slip codes
Burnt converter
Overheated fluid

U660E, U660F Reverse Boost Valve Kit 47740-17K

U660E • U660F

Reverse Boost Valve Kit 47740-17K

Helps cure:

Delayed Reverse
Low line rise in Reverse
B2 Clutches burned

5R55S, 5R55W O-Ringed End Plug Kit 56947J-66K

5R55S • 5R55W

O-Ringed End Plug Kit 56947J-66K

Helps cure:

Soft & inconsistent shift feel
Various concerns depending on location of leaking end plug

U660E, U660F, U760E, U760F C1 Accumulator Piston Kit 47740-12K

U660E • U660F • U760E • U760F

C1 Accumulator Piston Kit 47740-12K

Helps cure:

Delayed Forward
Forward slip
C1 Clutch burned
Harsh Forward
Flare shifts

U660E, U660F, U760E, U760F O-Ringed End Plug Kit 47740-21K

U660E • U660F • U760E • U760F

O-Ringed End Plug Kit 47740-21K

Helps cure:

Shift concerns
Lockup concerns
Burnt clutches

200-4R, 4L60, 4L60-E, 4L65-E, 4L70-E Replacement Seal 77805-S-25

200-4R • 4L60 • 4L60-E • 4L65-E • 4L70-E

Replacement Seal 77805-S-25

For TCC apply valve kits 77805-K and 77805E-K.

Material: PTFE

Helps cure:

Lost or damaged component

4L60, 4L60-E, 4L65-E, 4L70-E Clip 77754-08

4L60 • 4L60-E • 4L65-E • 4L70-E

Clip 77754-08

Height: 1.010"
Width: 0.520"

Helps cure:

Lost or damaged component

40TE, 40TES, 41AE, 41TE, 41TES, 42LE, 42RLE, 45RFE, 545RFE Replacement Seal Kit 92834-03SK

40TE • 40TES • 41AE • 41TE • 41TES • 42LE • 42RLE • 45RFE • 545RFE

Replacement Seal Kit 92834-03SK

Material: Viton®
Cross Section: 0.070"
Inner Dia.: 1.301"

Helps cure:

Slide shifts
High CVIs
1-2 Shudder
Coastdown clunk

Powerglide Modulator Plug Gasket 3543L-5

Powerglide

Modulator Plug Gasket 3543L-5

4R44E, 4R55E, 5R44E, 5R55E, A4LD Retaining Pin 56947-11

4R44E • 4R55E • 5R44E • 5R55E • A4LD

Retaining Pin 56947-11

Length: 0.650"
Dia.: 0.072"

Helps cure:

Lost or damaged component

↑