![]() STEP 13 Begin to reinstall valve body parts. STEP 12 Install assembly in reverse order that parts were removed. Install intermediate overrun clutch retainer ring. When the intermediate overrun clutch outer race is installed, it should turn free in a counterclockwise direction only. Install intermediate overrun roller clutch assembly. Install direct clutch pressure plate and retaining ring. Lubricate with transmission fluid and install friction plates and steel plates starting with a steel plate and alternating steel and friction. Compress spring retainer and install retaining ring. Install spring retainer and reinstall OEM springs. Only use the two lip seals that go on the apply piston itself. Do not use the center lip seal in the direct drum. STEP 11 After this modification, begin to reassemble the direct clutch assembly. Do not reinstall the middle sized seal on the low/reverse piston. You should replace all lip seals since the transmission is fully disassembled. It is best to apply air to the piston through the reverse feed hole in the case under the valve body to remove the piston. This will allow the piston and return spring assembly to come out of the case. Using a press tool, compress the low/reverse return spring retainer and remove the snap ring. If speedometer gear is removed, the output shaft and ring gear will come out through the front of the case. Remove the reaction carrier, low/reverse clutches and steels. Next, remove the low roller clutch and anti-clunk spring. Grasp the output shaft and pull up until the low roller clutch is out of the case tabs. ![]() Remove snap ring that retains the low roller clutch support. Therefore, tack weld the snap ring to the sungear on the front side of the gear. The snap ring that holds the sungear to the sunshell is prone to failure in transbrake applications. Remove output snap ring and front planetary carrier assembly. STEP 10 Remove front ring gear, two thrust washers or two needle bearings and check for excessive wear. Make sure hole is clean of any burrs after drilling. STEP 9 Bleed hole for direct clutch drum is best drilled from the inside-out behind the piston area. Also remove the direct clutch lip seal that is in the drum. Remove direct clutch return spring snap ring with piston press. Remove clutches and steel plates from direct clutch drum. Call for more information.) Remove direct clutch pressure plate snap ring and pressure plate. An upgraded sprag assembly in place of the OEM roller clutch is highly recommended. Disassemble the intermediate roller clutch assembly and inspect. Remove intermediate overrun clutch front snap ring and retainer. STEP 8 Remove the direct and forward clutch drum assemblies. Inspect all parts for wear and replace as needed. STEP 7 Remove intermediate overrun band, intermediate clutch plates, and intermediate clutch wave plate cushion spring. Remove the middle ring (See Photo 1) on pump stator in addition to replacing the bushing, gasket, and seal. Install spring, valve, and solenoid into modulator assembly area. Plug both holes using 1/8” allenhead plugs included in this kit. Also, drill and tap a second hole in the second gear accumulator area. Drill and tap a hole using a 11/32” drill in the area indicated. (See Photo 2 & 3) Remove intermediate servo piston, washer, spring seat, and apply spring. While your case may not look exactly like those pictured, it will share same functionality. STEP 5 Many variants of the Turbo 350 were produced by GM. Remove valve body spacer support, plate, and gaskets. Remove valve body attaching bolts and valve body. Remove detent roller and spring assembly from valve body. STEP 4 Remove filter assembly and filter gasket. Make sure to clean any gasket material from pan and pan rails. Drain transmission fluid from pan, and remove pan. STEP 3 The stock valve body from transmission must be replaced with BTE 321500 unit. STEP 2 After placing the transmission in your work area, remove the torque converter unit. Make sure the transmission is cool, as the fluid inside the unit can be very hot. If you have any questions, please call our tech line 66. This reverse pattern valvebody (Park-Reverse-Neutral-First-Second-Third) is designed to work only with non-lockup units. Please follow the following instructions for installing BTE’s 350 transbrake valve body. TURBO 350 TRANSBRAKE INSTALLATION INSTRUCTIONS
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