FAQ Manual Transmissions

FAQ Manual Transmissions

Q: How can I identify my ZF manual transmission?
A: S5-31 5-speed manual transmissions have a three-letter code stamped to the main housing. The S6-40 6-speed manual transmission and all other 4- and 5-speed manual transmission have an I.D. plate affixed to the main housing of the transmission. The ZF transmission number is stamped onto this plate.

Q: Where can I purchase Genuine ZF Parts to repair my ZF S5-31 manual transmission?
A: ZF Parts for ZF S5-31 manual transmissions are available in North America through your preferred ZF Parts passenger car transmission distributor..

Q: What type of parts are included in my S6-40 transmission?
A: Please check out the literature section of this website to view the ZF S6-40 transmission and spare parts catalog.

Q: What type of oil do I need to use in my ZF S6-40 Corvette transmission?
A: ZF only recommends the following lubricant for S6-40 transmissions. The GM oil (available from GM with part number 1052931) and the Castrol Synthetic Formula RS 10W60 (available from BMW with part number 0751009420).

Q: What is the recommended service interval for my ZF S6-40 Corvette transmission?
A: The lubricant should be changed every 30,000 miles.
Q: Are parts available for my ZF S6-40 Corvette transmission to do repairs? Where?
A: Yes, all spare parts and kits are available for repairs. For a complete list of kits and spare parts, please contact Rockland Standard Gear, Inc., the exclusive distributor for S6-40 transmissions, kits, and spare parts. The spare parts catalog is also available online in the literature section. A link for Rockland Standard Gear's website is below.

Q: Where can I buy a new or remanufactured ZF S6-40 Corvette transmission?
A: You can contact your local Chevrolet dealership or contact Rockland Standard Gear, Inc. for price and availability information.

Q: Where can I get my ZF S6-40 Corvette transmission repaired?
A: Please contact Rockland Standard Gear, Inc., the exclusive distributor for S6-40 transmissions, kits, and spare parts. They have service centers throughout North America. A link for Rockland Standard Gear's website is below.

Q: Can I adapt a ZF S6-40 Corvette transmission to another application?
A: Yes, the ZF S6-40 6-speed manual transmission can be adapted to other vehicle applications. For more technical information about feasibility contact Rockland Standard Gear, Inc. below.

Q: I hear a noise when I have the clutch pedal fully depressed. What could the problem be?
A: Engine noise; Clutch release hub and bearing failure; Pilot bearing failure; Misaligned transmission

Q: The noise disappears when the engine RPM exceeds 1500 without depressing the clutch pedal. What does this condition suggest?
A: This condition is referred to as neutral rollover. This is caused by the engine firing pulses, which are transmitted through the gear set. Some neutral rollover is normal. The dual mass flywheel should eliminate this concern.

Q: There is a "whining" noise coming from my transmission. What could the problem be?
A: It is possible that the input shaft gear and/or the countershaft drive gear are worn.

Q: I am experiencing hard shifting problems, especially in 1st, 2nd, and Reverse. What are the possible causes of this condition?
A: Clutch not completely releasing; Operator not fully depressing clutch pedal; Air/water in the hydraulic clutch hose; Insufficient reserve of synchronizer ( A defective clutch system can result in a premature loss of synchronizer reserve).

Q: My transmission is leaking fluid from the tail section. What could cause this?
A: Fluid leaking from the tail shaft seal is usually a direct result of over tightening of the "C" beam. If the transmission or "C" beam has been removed from the vehicle, it is critical that the "C" beam bolts are torqued to the correct specifications. (See GM service manual) Over tightening can cause the tail shaft housing to become "warped" and the seal will no longer be round and will not form a proper seal.

Q: Where do I get parts and service for my 5DS25/2 Pantera transmission?
A: ZF sold the complete rights to RBT Transmissions. Please contact them at Address 1100 West Katella Avenue (B) - Orange, CA 92867; Phone +1 (714) 516-1215; Fax +1 (714) 516-1216; Email: lbutfoy@aol.com; Website: www.rbttrans.com

Rockland Standard Gear Website

Where Can I Buy Genuine ZF Parts

Last Update: 12.11.2008