700R4 build thread.

[clinebarger]

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.

[clinebarger]

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.

[clinebarger]

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.

[clinebarger]

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.

[clinebarger]

Install the forward clutch piston (630) into the forward clutch housing (628). If reusing the Aluminum Forward Piston, Install Lip seals first. I do not use TransJel on the outer piston seal, Use ATF, Fit the Forward Piston into the Clutch Housing using you finger nail, Lube the Inner seal with Transjel.

**Note, Only use a 3-4 Apply Ring that has a 7 stamped on it, This is the shortest apply ring allowing the most room for 3-4 clutch stack-up**

Place the 3-4 Apply ring on the bench with "Fingers" up, Place the 3-4 clutch return spring assembly in the middle of the apply ring.

Place the Forward Piston & Housing on top of the return spring, Align the 5 tabs on the Forward piston with the Fingers on the apply ring.

[clinebarger]

Continued....

[clinebarger]

Grab the 3-4 Apply Ring by the Fingers, Lower the Assembly down into the Input Drum, The Forward Piston will stop short, The Apply Ring & Return spring will fall to bottom.

Use a Lip Wizard or other Lip Seal tool to fit the Inner Forward Piston Lip Seal onto the Input Drum, The Piston & Housing will drop onto the return spring.

Install Overrun Piston next, If reusing Aluminum piston, Install both Lip Seals.
Lube Inner & Outer Lip Seal with TransJel, Using a Lip seal tool, Fit the Inner seal FIRST!, When the Piston will no longer "Rock" side to side....Fit the Outer Overrun Piston Seal to the Forward Clutch Piston.

Install Overrun Piston Return Spring Assembly on top of Overrun Piston, Compress spring & Install Snap Ring.

A beginner may want to practice a little with the old lip seals/pistons.