ATI SuperCase/Bellhousing Installation Instructions
The ATI SuperCase is engineered to accept GM Powerglide spec replacement parts. The ATI Bellhousing may be installed to the case before or after the transmission assembly. Standard or Powerglide assembly procedures should be followed unless noted otherwise. Case Venting – It is important to properly vent the transmission to the atmosphere. ATI recommends using a length of semi-clear, high temp, Teflon based tubing (1/4” OD, 1/8” ID) with a Push-In fitting (1/4” tube, 1/8” NPT). The tubing should be routed to some type of catch bottle to prevent any fluid from reaching the track surface. The vent hole is near the top of the case above the servo bore.
Tailhousing Venting – The tailhousing also needs to be vented. If you are using a stock oem governor support the venting is done through the case. If you are using an aftermarket governor support (with bearing) the vent hole becomes blocked. The solution is to either drill a 1⁄4” hole in the support into the cavity area between the 1 o’clock and 2 o’clock positions or provide a or separate vent for the tailhousing. ATI’s tailhousings and other makers provide a threaded hole for an additional vent tube. “Shorty” extensions do not require venting.
Assembly Notes
• The reverse gear clutch pack needs to be installed prior to inserting the steel safety liner into position.
• The 2 pressure test ports need to be plugged (plugs included). One is located in front of the servo bore. The other is near the rear of the right side.
• Pipe thread holes need to be sealed with Teflon pipe sealant or equivalent.
• Straight thread holes need a light coat of “anti-seize” lubricant.
• The 6 – 7/16” bolts (included with the bellhousing) that attach the bellhousing are to be torqued to 40 ft/lb and use red “262” Loctite.
Get pdf ATI SuperCase/Bellhousing Installation Instructions
