For the T 56 75W85 or Dex III

[strike3dude]

Tremec says Dex III and the service manual says 75W85....???

[Steve-Indy]

Mopar Dexron III is no longer supplied. The substitute is Mopar ATF+4.

Some still use the Mopar Synthetic Manual Transmission Lubricant in 1999 through 2006 Vipers but is getting hard to find. The original supplier was Castrol...and it was also used in Corvette T-56's.

The ATF+4 will work fine...but, you MAY experience more noticable Neutral Gear Rattle (NGR).