1 0 Mack Transmission Part for a 1990 Mack MH613 $250 USD used Mack 12 Speed Transmission Shifter Knob. Air operated selector has hi, low, neutral and reverse thumb selector. May fit other transmission models. (not actual picture), Serial#:... ConditionUsedFits To Make(s)MackFits To Model(s)MH613Will Fit Year(s)1990Part Number20QE398 313180Stock NumberP-60827 MLS Number13373857CategoryTransmission Parts Last Updated2/1/2025 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info