1993 RT 10 Transmission oil

[Sam Emerson]

Have used Valvoline ATF-4 in the past but now only seems to be available in synthetic version. Any known issues or problems associated with synthetics in this transmission? Thanks

 

[steve e]

Synthetic ATF is just better than old dinosaur oils, has higher heat range capability and cuts friction, it will work fine in your trans, and be better for it.

 

[MoparMap]

Yeah, I actually asked Tremec what they recommended once because I put a Viper T56 in my 67 Dart. They said Mobil 1 ATF was what went in most as a factory fill. I can definitely hear the neutral gear rattle that they talk about in the early Vipers though. That was one reason Dodge went to the Castrol Syntorq, though I think it puts up with the extra power and torque of the newer cars a little better too. ATF won't hurt it though, and I believe the sticker on the side of my mom's 94 says Dexron III or something like that.

 

[lane_viper]

So after I rebuilt my Daily Driver C5's t56 I went with Pennzoil Syncromesh, Almost 40,000 miles later everything is still great.

After having to rebuild the T56 in the Viper shortly after buying it, I went with Syncromesh after the rebuild. Being that it is doing well in the C5, I have no fear in using it in the Viper.