03' Big Red Posted August 9, 2016 Share Posted August 9, 2016 I have a 2003 rd with a Eaton 8ll and 4:42 axle ratio i am considering swapping in a Allison automatic, I know using the 4000 series would be very costly due to wiring and computers, any thoughts on using the HD750 ? i know it's direct drive and I would have to change axle ratio to get any road speed, does the computer in my truck care what trans is used ? Or is it stand alone ? how do I determine the grade ability of this combo ? I know there are many different torque converters available. I've read I should try for 60% grade ability. Quote Link to comment Share on other sites More sharing options...
fjh Posted August 9, 2016 Share Posted August 9, 2016 DON'T EVEN GO THERE! Big Bucks ! dont forget you have to Plumb the oil cooler as well as all the wiring and programing issues your going to have! NOT a Smart move! Its likly doable But AT WHAT COST! Quote Link to comment Share on other sites More sharing options...
03' Big Red Posted August 9, 2016 Author Share Posted August 9, 2016 Yeah, I wasn't sure if I would have programming issues with the HDSeries versus the fully electronic versions. Quote Link to comment Share on other sites More sharing options...
TeamsterGrrrl Posted August 9, 2016 Share Posted August 9, 2016 A lot of the later HD series were electronic, so maybe programming issues too. Best to just buy a truck with an Allison already factory installed, probably cheaper in the long run. If you can find an ex-Postal Service Mack with an Allison cheap you could swap the whole powertrain, but it might be a hassle making that powertrain from the 90s work with a newer Mack. To get any idea what all you need, might want to ask an Allison dealer what all would be required to retrofit an Allison to the truck. Quote Link to comment Share on other sites More sharing options...
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