Mel S - '96 Safari Posted July 26, 2021 Share Posted July 26, 2021 (edited) As of January, 2021, Allison recommends only TES 668 approved. ATF for On-Highway use. See: https://www.allisontransmission.com/docs/default-source/aftermarket-brochures/sa8742en-tes668-brochure_f_rev.pdf?sfvrsn=2189e81d_0 And: https://www.allisontransmission.com/parts-service/approved-fluids/on-highway-fluids Edited July 26, 2021 by Mel S - '96 Safari 1 Link to comment Share on other sites More sharing options...
Dr4Film Posted July 26, 2021 Share Posted July 26, 2021 Mel, I think Allison recommends either TES-295 or the new & improved TES-668 for their Allison Transmissions for On-Highway use. The TES_668 just became available in January this year so it is still fairly new. Link to comment Share on other sites More sharing options...
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