700R4 build thread.

[clinebarger]

You will need a good air blower with a good rubber tip. Air pressure 40 to 60 psi.

Pressurize the Forward Clutch Feed. The Forwards will apply. The 3-4 Clutches SHOULD NOT move, Observe the Apply Cage & 3-4 pressure plate for movement though the holes in the Input Drum.
***'87-'93 4L60 Builders, Hold your finger over the hole directly under the Forward feed hole in the pic, On the side of the pump, This is the Forward Accumulator Feed***

Pressurize the 3-4 Clutch Feed, 3-4 Clutches will apply, The Overrun Clutches SHOULD NOT apply, Confirm this by Overrunning the Input Sun Gear counter clockwise by hand, Have another hold the drum stationary if needed.
(The Input Sun Gear is the gear in the middle of the Input drum in the previous pic)

Pressure the Reverse Feed, Listen for gross leakage.

[clinebarger]

If any of the above air test fail, Let me know & I will help, Explaining all that would take pages.

Remove the Input Drum from the Reverse Input Drum/Front pump by pulling straight up with the Assembly is still upside down.

Place the Input Drum in a parts washer or Drain pan with the Input shaft pointing up, Fill the top cavity with Solvent, Plug the Bleed Orifice with your finger.
Pressurize the 3-4 Clutch feed hole between the 2 bottom sealing rings.

If there is a leak between the Input shaft & Input Drum.....Stop, You need a new Input Drum!!!

Check for 3-4 Check ball Capsule for leakage, Replace this Capsule 100%!!!

[clinebarger]

Continued.. You can't see the Bleed Orifice through the solvent.

[clinebarger]

Finally time to disassemble the Input Drum.

Hole saw a hole in your work bench to stick the Input shaft through so you can work on the drum.

Start with removing the 3-4 snap ring from the Drum, Grab the Apply plate at the bottom of the 3-4 stack, Stack upside down out of the way with the 5 Release springs that fall out of the drum & Snap ring.

Remove the Forward Clutch Snap ring (This snap ring is Stout).
Turn the drum over & The Forward Clutch stack, Forward Sprag Assembly, Overrun Clutches, & Sprag Torrington bearing will fall out of the drum.

[clinebarger]

Forward Clutch detail.

Forward Apply plate (646).
Forward clutch waved plate (648).
Steel plates (649A)
Backing plate (650)
Forward Clutches (649B)

[clinebarger]

Overrun clutch detail, Not much to it.

[clinebarger]

Now you will be looking at the Overrun/Forward piston Return spring assembly.
Compress spring cage, Remove snap ring.
Turn Drum over, Apply air to the 3-4 clutch feed (shown in earlier post).
This will blow the pistons out. Some builders smack the drum against the work bench to remove pistons, Good way to crack this delicate drum.

Remove the inner O-ring from the Input Drum (pic), DO NOT forget to reinstall this O-ring!!! Upon assembly. Thin Green O-ring in the seal kit.

[fisherman420]

Originally Posted by clinebarger

You will need a good air blower with a good rubber tip. Air pressure 40 to 60 psi.

Pressurize the Forward Clutch Feed. The Forwards will apply. The 3-4 Clutches SHOULD NOT move, Observe the Apply Cage & 3-4 pressure plate for movement though the holes in the Input Drum.
***'87-'93 4L60 Builders, Hold your finger over the hole directly under the Forward feed hole in the pic, On the side of the pump, This is the Forward Accumulator Feed***

Pressurize the 3-4 Clutch Feed, 3-4 Clutches will apply, The Overrun Clutches SHOULD NOT apply, Confirm this by Overrunning the Input Sun Gear counter clockwise by hand, Have another hold the drum stationary if needed.
(The Input Sun Gear is the gear in the middle of the Input drum in the previous pic)

Pressure the Reverse Feed, Listen for gross leakage.

All of my leak tests checked out except the reverse feed....there is a significant amount of leakage that seems to be coming from somewhere between the input drum shaft and reverse input drum from what I can tell. what could this mean? I'm hoping its just due to old, failed input shaft seals that were in my 89 700r4 core.....

[clinebarger]

Replace the 2 Stator Support Sealing Rings & retest.