That number (1052931) was used in the ZF Transmission in the Corvette 1990 to 1996 and some other applications. It's a Texaco blend 5W-30. The 12345349 is made by Pennzoil for GM. It's basically a 5W-30 oil as well but I would question if it has the same properties, though it does meet the same GM specification GM 9985648. GM doesn't change part numbers unless something is different. I would use the later number in the ZF transmission but not the older number in the newer tranny (TKO). Bigblue73 is right.

Buy Genuine GM Fluid 88861800 Manual Transmission Fluid - 1 Quart: Transmission Fluids - Amazon.com ✓ FREE DELIVERY possible on eligible purchases. IDEAL FOR MANY GENERAL MOTORS, CHRYSLER, HONDA and OTHER VEHICLES AMSOIL Manual Synchromesh Transmission Fluid is a higher quality, lower Replaces Honda Genuine MTF fluid for manual transaxles and Texaco MTX fluid. Not for use in engines or wet clutch applications.

The 12345349 number has been around for a long time and anyone having the old 1052931 oil doesn't sell much oil. Tremec specifically recommends the 12345349 so if it were up to me I would return the 1052931 and buy what is recommended. You could also use the Pennzoil Synchromesh as its the same as the GM 12345349.

It's cheaper and should be available at most aftermarket parts stores. Amsoil is very good oil but isn't on the list of approved oil for Tremec. That doesn't mean it isn't good oil! Just that it wasn't tested and approved. Keep in mind that if you run a non approved oil in your new Tremec it will void the warranty. After the warranty period it doesn't really matter.

I'm not sure that's correct - though you might know better than I. Amsoil synthetic manual synchromesh transmission fluid is compliant with GM 9985648, 9986105, and 9985535. Part numbers 123453498, 12345577, 12377916, and 1052931 It explicitly lists the TREMEC TKO600 on the bottle. I'm not near the bottle right now, but directly from the AMSOIL site. ' APPLICATIONS Recommended for automotive and light-truck applications that require synchromesh transmission fluid.

Applications include manual transmissions and transaxles such as New Venture NV T350, NV 1500, NV 2550, NV 3500, NV 3550, NV 5600, and Tremec T4, T5, T18, T56, T176, TKO500, TKO600, TR 3450 and TR 3550. Replaces MTF-94 fluid for Land Rover, MG, and Mini Cooper. Replaces Honda Genuine MTF fluid for manual transaxles and Texaco MTX fluid. Not for use in engines, hypoid rear axles, limited-slip or wet clutch applications. I'm not sure that's correct - though you might know better than I.

Amsoil synthetic manual synchromesh transmission fluid is compliant with GM 9985648, 9986105, and 9985535. Part numbers 123453498, 12345577, 12377916, and 1052931 It explicitly lists the TREMEC TKO600 on the bottle. That's correct. The oil manufacturer says it meets the spec and will work for a Tremec but Tremec has not put it on the list of approved oil for their transmissions. Wrong oil, no warranty. BTW you CAN run the Synchromesh in the earlier T56 but they used ATF in those from the factory.

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The Synchromesh will be fine and will actually run quieter. That's correct. The oil manufacturer says it meets the spec and will work for a Tremec but Tremec has not put it on the list of approved oil for their transmissions. Wrong oil, no warranty. BTW you CAN run the Synchromesh in the earlier T56 but they used ATF in those from the factory. The Synchromesh will be fine and will actually run quieter.