SC 4 with 1057 problem

[upinsmoke]

I am looking for any information as I am at my end I have installed a SC4 & 1057. Install went fine went for test drive and limped in 5th gear also noticed when shifted into reverse that a couople seconds later it would jump like it was shifting into reverse again. I have taken transmission out and tore down 5 times now to a bare case. I can not see anything damaged or out of place. upon each time I assembled I would function test each clutch with air works perfect. Tore valve body apart each time spotless. The only codes I get are PO700 and PO735. I am at the end of nerves and need some help.

Thanks

 

[duratothemax]

something is causing C2/C3 to slip. Were they burned last time you tore it down?

Are the transgo valves/check balls and gain valves installed proprly? Do all the other gears shift smoothly?

 

[serpa4]

I had shifting problems with mine. Ended up being a bad conection in the main engine to trans plug. I didn't do my sc4 personally. A shop did and said that was the issue. I only had reverse issues not limping.

 

[sweetdiesel]

Sorry to hear this Stew!

 

[messejme]

stew did you check clutch clearances with a feeler gauge during assembly? Or something wrong with valve body and or selenoids. Did you use a torque wrench to tighten VB?

 

[Mike L.]

You may have a defective C3 piston. Check the lip inside and out for any nicks. Check and see how many holes are in the C3 piston; should be only one and it will be .054. When air checking C3 you should use a test plate and only about 60 psi of air. Oil the C3 passage heavily and then air test and watch for oil escaping between piston and case. If all that checks out, look at the C2 ballance rubber piston which sets on top of the C2 aluminum piston held by a large snap ring. Ther should be no tears in that piston.

 

[upinsmoke]

On original trans all clutches were like new or minimal slip on C2 converter seemed to be the culprit, All gears shift smooth even 5th, all valves and checks are in place, I will check harness for the reverse problem. Check clearances with feeler guages on all clutches seemed to be over spec by max of 0.005" I religously used a torque wrench for all fasteners valve body torque 9.0 ft/lbs

 

[upinsmoke]

Mike thank you very much for the help, I checked the C3 clutch seal lips perfect, only one bleed hole installed at 12:00 position, The C2 ballance piston looks perfect. I am at a loss and wish I could drive it to you to test drive. Is there any checks I can do prior to pulling it out again to narrow it down any ? You wisdom is very appreciated and thanks again

 

[Mike L.]

What year truck? Sounds like you might be losing backfill pressure ( 3psi charge on all pistons not applied ) Ther is a C1 dump valve in the pump cover and the retainer is known to break. How are the o rings on the pressure switch manifild?

 

[upinsmoke]

Funny you ask that mike, the truck is 2004.5 when I went to install the boost valve for lly it wouldnt fit, it required the lb7 valve and the only other mod to the stator housing was the shim, am I missing something here. The other thing I did not mention is the reverse thing is only when the trans is warm to hot. Cold no double engage in reverse. O-rings are good all 6. The C1 dump valve retainer is this the valve that is fluddering in the stator support when I air test the clutch. I know you are going above and beyond and I appreciate everything you are doing.

 

[Mike L.]

Funny you ask that mike, the truck is 2004.5 when I went to install the boost valve for lly it wouldnt fit, it required the lb7 valve and the only other mod to the stator housing was the shim, am I missing something here. The other thing I did not mention is the reverse thing is only when the trans is warm to hot. Cold no double engage in reverse. O-rings are good all 6. The C1 dump valve retainer is this the valve that is fluddering in the stator support when I air test the clutch. I know you are going above and beyond and I appreciate everything you are doing.

The fluttering valve is the one I speak of. Change tcm's and see what happens.

You have an '03 trans like mine. '04.5 Alli came out in April or may.

 

[upinsmoke]

Thanks Mike just PM'd you

 

[MaxFarmer]

Any news?

 

[Mike L.]

Any news?

I haven't heard a word yet but I'm ready to help.

 

[upinsmoke]

Sorry guys got tied up at work till late last night, I found the C1 dump valve retainer is missing an ear but still sitting in normal place. I notice my broken stator housing has the other style retainer (flat "U" shape). I am not sure if you are working today MIke I will try and call in a bit anyway.

 

[Mike L.]

I had a feeling your retainer was broken. Call my cell if you need me 310 918 9678

 

[upinsmoke]

Great news talked to Mike and think we have it narrowed down will do some investigating tonight and let you know. Thanks
Mike :rockon:

 

[upinsmoke]

Well pulled trans out after talking to Mike today and proved once again Mike is King, my used stator is not the same as the old one I broke. LB7 and LLY stators are not the same I was told they were not differnt and well leson learned. Thanks to mike and waiting on parts from Mike will keep you posted.

 

[Kat]

Well pulled trans out after talking to Mike today and proved once again Mike is King, my used stator is not the same as the old one I broke. LB7 and LLY stators are not the same I was told they were not differnt and well leson learned. Thanks to mike and waiting on parts from Mike will keep you posted.

Mike is the Sheep err I mean the man :joker:

:witch:

 

[Cornell]

awesome Mike. that must be a huge relief