TCC SHIFT VALVE TRAIN SERVICE MANUAL UPDATE THM700R4

THM 700-R4 YK, YT, YX, YP, YZ, YC, PR, MT, VC, PQ, YN, YA

At the start of production of the 1985 THM 700-R4 transmission, the converter clutch shift valve train was eliminated on vehicles that have T.C.C. apply controlled by the E.C.M. Use drawings in Figures 1, 2, and 3 to update your 1985 Service Manual.

ILL. NO. DESCRIPTION --- ----------- 301 VALVE, T.V. MODULATOR DOWNSHIFT 330 SPRING, 4-3 SEQUENCE VALVE 302 SPRING, T.V. MODULATOR DOWNSHIFT 331 SPRING, T.V. LIMIT VALVE VALVE 332 VALVE, T.V. LIMIT 303 VALVE, T.V. MODULATOR UPSHIFT 333 VALVE, 1-2 ACCUMULATOR 304 SPRING, T.V. MODULATOR UPSHIFT VALVE 334 SLEEVE,1-2 ACCUMULATOR VALVE 305 SLEEVE, CONVERTER CLUTCH THROTTLE 335 SPRING,1-2 ACCUMULATOR VALVE 306 SPRING, CONVERTER CLUTCH THROTTLE 336 VALVE, LINE BIAS 307 VALVE, CONVERTER CLUTCH THROTTLE 337 SPRING, LINE BIAS VALVE 308 VALVE, CONVERTER CLUTCH SHIFT 338 SPRING, 3-2 CONTROL 309 SLEEVE, 3-4 THROTTLE VALVE 339 VALVE, 3-2 CONTROL 310 SPRING, 3-4 THROTTLE VALVE 340 VALVE, MANUAL 311 VALVE, 3-4 THROTTLE 341 PIN, COILED SPRING 312 VALVE, 3-4 SHIFT 342 PIN, COILED SPRING 313 SLEEVE, 2-3 THROTTLE VALVE 343 RETAINER, SPRING (SLEEVE) 314 SPRING, 2-3 THROTTLE VALVE 344 PLUG, VALVE BORE 315 VALVE, 2-3 THROTTLE 345 PLUG, CUP (.33 DIA.) 316 VALVE, 2-3 SHIFT 346 SWITCH ASSEMBLY, PRESSURE 317 SLEEVE,1-2 THROTTLE VALVE (3RD CLUTCH) 318 SPRING,1-2 THROTTLE VALVE 347 SWITCH ASSEMBLY, 319 VALVE, 1-2 THROTTLE PRESSURE (4-3 PULSE) 320 SLEEVE, LO RANGE CONTROL 348 SWITCH ASSEMBLY, 321 VALVE,1-2 LO RANGE DOWNSHIFT PRESSURE (4TH CLUTCH) 322 VALVE,1-2 SHIFT 349 SWITCH ASSEMBLY, PRESSURE 323 SLEEVE, THROTTLE VALVE PLUNGER (T.C.C.SIGNAL) 324 PLUNGER, THROTTLE VALVE 350 BODY, CONTROL VALVE 325 SPRING, THROTTLE VALVE 351 PLUG, T.V. LIMIT 326 VALVE, THROTTLE 352 PLUG, VALVE BORE (12.5-O.D.) 327 SLEEVE, THROTTLE VALVE 353 VALVE, 1-2 LO RANGE UPSHIFT 328 VALVE, 3-4 RELAY 354 PLUG, CONVERTER CLUTCH SHIFT 329 VALVE, 4-3 SEQUENCE VALVE BORE (ECM CONTROLLED VEHICLES) 355 PLUG, CONVERTER CLUTCH T.V. BUSHING BORE (ECM CONTROLLED VEHICLES)

Figure 2 - Control Valve Assembly Legend

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.