View 1 Photo View 0 Videos Allison HT740DR Transmission for a 2000 Mack MR688S Recently Updated $750 USD CORE/ REVERSE VERY SLOW TO ENGAGE. ALL FORWARD GEARS OK, Serial#: GET, Engine Make: Mack, Engine Model: E7, Casting#: GET ConditionUsedEngine ModelMack E7Fits To Make(s)MackFits To Model(s)MR688SWill Fit Year(s)2000Stock Number32316-16 MLS Number9001907CategoryTransmissions Last Updated5/14/2026 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info