What part is this??
Thread Starter
Registered User
Joined: Feb 2003
Posts: 2,639
From: Mooresville, NC
What part is this??
And how important is it? 
Transmission(700R4) worked when it was taken out. I am planning on putting it in my M6 car and was gonna clean it up/change filter and stuff like that, then I saw this crack in that part!
Transmission(700R4) worked when it was taken out. I am planning on putting it in my M6 car and was gonna clean it up/change filter and stuff like that, then I saw this crack in that part!
Last edited by marshall93z; Oct 9, 2007 at 08:56 PM.
Supporting Vendor
Joined: Oct 2006
Posts: 1,014
From: BLOOMSBURG PA
Thats the forward clutch accumulator housing cover, eventual failure will result in suddent loss of all forward gears. You need to go to a trans shop and ask if they have and aux valve body for a 700r4.
Registered User
Joined: Oct 2007
Posts: 27
From: Florida
X2. Superior also sells a HD cover thats steel and thicker. Corrects another Aux VB issue of the piston pin coming out. After you remove that cover you need to check the pin to see if its coming out. Here is some good info on that. Also list the Superior part #. The part is about $10 nowadays http://www.specialtytrans.com/specia...0R4-Aux-VB.htm Hope this helps
Registered User
Joined: Oct 2007
Posts: 27
From: Florida
You can put another cover on it. Ive seen broken ones B4. Cheap thin aluminum, its like an accumilator, so its got a piston and thick spring in there. Pressure, maybe some douch overtightened it B4 causing a stress fracture. The spring is directly against it and the piston pushes on the spring. The HD part cures a 'walking out' probelm with the piston center pin and is thicker to cure the cracking issue. Just an option. Unless you find a used one off a junk tranny the GM part from the dealer is going to cost more than the HD part. Part # is on the end of it. Options yours. Hope this helps
Thread Starter
Registered User
Joined: Feb 2003
Posts: 2,639
From: Mooresville, NC
If it's the cover, why do I need the aux valve body? Or do I just need the cover?
Thanks for the link!
Registered User
Joined: Oct 2007
Posts: 27
From: Florida
It would be more likely a tranny shop will get you a used AuxVB in its entirity from a donor trans. I would inspect the one you have inside and out gro any more stress fractures, etc. If youre uncomfortable with re-using that one, try to locate an entire assembly. Like PerfBuilt said, just try a local tranny shop. Dealer is probably high enough on the cover alone, Im guessing the entire unit will be outrageous. If you think your assembly is OK and it was just the cover, then replace the cover by itself. Just throwing out some options for ya. Hope ya find it and get it back on the road =)
Registered User
Joined: Oct 2007
Posts: 27
From: Florida
Be sure the spring isnt broken (tho Ive never seen an AuxVB spring breal just a 1-2 Accumilator spring) and the piston isnt cracked either. The piston seal needs to be good and snug, Meaning it will be tight in the bore. Also follow the pin-length checks on the link I posted B4. Hope this helps and Good Luck Bud!