700R4 build thread.

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**If your reusing the Reaction shaft (with a Flat bottom), Place the Brass 4 tang thrust washer on the SunShell, Use TransJel to stick it to the Shell.

**If using an Updated 4L60E Reaction Shaft, Soak the Torrington in ATF, Stick the bearing to the Reaction Shaft......The Delco Shell kit comes with a Shell, Shell to reaction shaft Torrington bearing, Reaction Shaft, & Input planet to reaction shaft Torrington bearing.

**If you are using a Beast or Sonnax Shell, You can still "rollerize" the Reaction Shaft, You need a Reaction Shaft & BOTH Torrington bearings from GM.
**NOTE** DO NOT use the Input Planet to Reaction Shaft Torrington from the bearing kit if you get a Reaction Shaft from GM, It was revised in '07/'08.

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Install Reaction Shaft/3-4 hub assembly.

Soak Input Planet in ATF, Soak input planet to reaction shaft Torrington bearing in ATF,
Stick the bearing to the bottom of the planet with TransJel.
Install Input Planet into 3-4 Clutch Hub.

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Using an air blower, Check all Lube holes in the Output shaft for blockage.

Insert Output shaft from the bottom of the unit, Turn it to engage everything, Use a Bungee cord to hold the shaft in place while installing the snap ring. Use the New snap ring included in the rebuild kit!

The Gear train is now done.

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If your Input Sun Gear is separate from the forward sprag. Place it in the Input planetary.

700R4's had separate Sun Gears from the factory, Just being thorough, Ive opened quite a few that had 4L60E forward sprags.

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Cover the Case/Geartrain with something lint free, Like a old bed sheet.
Time to build Drums....

Lets start with the Forward Sprag assembly, DO NOT use '82-'86 Forward Sprag assemblies!!

ID info....The early sprag assembly. Has no thrust plate & requires a plastic thrust washer on top of the Input Planet, The Late Sprag has a Thust Washer.

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Place Sprag assembly on the work bench with the Overrun hub facing up, Remove snap ring, Remove Overrun hub.
Separate the Forward clutch hub from the Sprag, Remove Sprag & both Sprag retainer rings & Discard.

**NOTE, Use Borg Warner Sprags, If it does not say Borg Warner on the Package...It's a Knock off...DO NOT use. If a genuine BW cannot be found, Go to the Dealer & buy a SKF Sprag, In fact a SKF is fine behind a stock engine.**

Note the position of the "Dogs" in the pic for reassembly.
Install 1 of the Sprag retainer rings on the Inner Sprag Race.
Install the Sprag Element in the Forward Clutch Hub (outer race).
Roll the Inner Sprag race into the Sprag element.
Temporarily place Overrun hub on Inner Race, Hold Forward Clutch Hub still, Overrun Hub should turn Clockwise, But not Counterclockwise. If the Overrun hub turns Counterclockwise....The Sprag is installed backwards, Correct before proceeding!!!

Remove Overrun Clutch Hub, While holding the assembly together, Dip it in ATF.
Install the 2nd Retainer Ring, Install Overrun Clutch Hub, Install snap ring.

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Time to build the Input Drum.

Install the Inner "Green" O-ring in the Drum, Refer to post #53. Lube O-ring with TransJel,

Install 3-4 Piston, Lube both Lip seals with TransJel, Start the piston lip seal at an angle in the Drum & Rock the Piston into the Drum, No Lip Seal tools required for this piston.

USE ONLY 4L60E Molded steel 3-4 Piston!! The Stock aluminum piston is known for porosity problems & cracking.