Condition/Concern Recommendation/Instructions

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Condition/Concern Recommendation/Instructions

Bulletin No.: PIP5170 Date: Jan-2014 Subject: Driveline Support Torque Tube Automatic Transmission Noise Diagnostic Tip Models: 2014 Chevrolet Corvette Equipped with automatic transmission The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Noise from transmission or driveline. Recommendation/Instructions When diagnosing any noise that may be coming from either the torque tube or automatic transmission do not remove the torque converter bolts to aid in determining root case. The torque converter cannot be moved away from the torque tube far enough to disengage the torque converter pilot from the torque tube. Removal of these bolts and starting the engine will cause the torque converter pilot and propeller shaft transmission flange to become fused together requiring replacement of the torque converter, flex plate and torque tube assembly. The torque converter and the rear flex plate bolts will also need to be replaced. Note: Actively increasing the line pressure with GDS2 software may aid in determining if root cause of the noise is in the transmission or torque tube. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION 1.

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United States Patent [19] [11] Patent Number: 4,867,260 Cameron Et Al
United States Patent [19] [11] Patent Number: 4,867,260 Cameron et al. [45] Date of Patent: Sep. 19, 1989 [54] ALL-WHEEL DRIVE VEHICLE POWER TRAIN OTHER PUBLICATIONS vw Golf Syncro, VISCODRIVE. [75] Inventors: Dugald Cameron, Grosse Pointe Woods, Mich.; Karl Friedrich, Primary Examiner-Mitchell J'. Hill Leibnitz, Austria; Rudolf Zmugg; Attorney, Agent, or Firm-Edward P. Barthel Peter Resele, both of Graz, Austria [57] ABSTRACT [73] Assignee: Chrysler Motors Corporation, A drive line assembly and mounting arrangement for Highland Park, Mich. converting a front engine front wheel drive vehicle to an on-demand four wheel drive system. The vehicle [211 Appl. No.: 266,462 rear axle is adapted to be selectively driven by means of a viscous ?uid coupling positioned intermediate a for [22] Filed: Nov. 2, 1988 ward angled universal-joint drive line assembly and a rear torque tube enclosed longitudinal propeller shaft [30] Foreign Application Priority Data assembly. An overrunning clutch is rigidly connected Dec. 15, 1987 [AT] Austria ............................... ,. 3296/87 intermediate a forwardly extending neck portion of the rear axle drive housing and the torque tube de?nes a [51] Int. Cl.“ ..................... .. B60K 17/35; B60K 23/04 composite torque tube structure. The overrunning [52] US. Cl. .. 180/360; 180/233; clutch is adapted to be locked for a transmission of 180/248; 180/249; 180/380 torque during normal driving. The rear axle drive hous [58] Field of Search ............ .. 180/248, 249, 233, 73.1, ing is sprung from the frame by a pair of transversely 180/75.1, 75.2, 88; 248/635, 634 aligned isolation mounts while the composite torque tube is resiliently secured by a bracket support adjacent [56] References Cited its forward end.
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Index to 1937 ‐ 1938 Buick Articles
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