michael57 Posted April 14, 2007 Share Posted April 14, 2007 Hi i have a R609 RST with a TRQ7220 QUADBOX can anyone tell me what the turque rating is for this transmissiom and what HP motor can it take Thanks for all the help Regards Michael Also Rob have you had a cance to get anything on your 711 turbo, no hurry as i still have a lot to still do to it as only down to the chassis and hope to paint soon. When you get a chance can you message me with it thanks R609 Quote Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/ Share on other sites More sharing options...
HK Trucking Posted April 14, 2007 Share Posted April 14, 2007 Hi i have a R609 RST with a TRQ7220 QUADBOX can anyone tell me what the turque rating is for this transmissiom and what HP motor can it take Not sure what the actual torque rating is on a TRQ7220, but in the past I have transplanted an ENDT675 (237hp) Maxidyne, and also an ENDT 676 (285hp) Maxidyne into trucks with the TRQ7220, and the transmissions held up okay.I know there are others who may differ with my opinion on this, but that has been my experience.It's just like anything else, if it's driven properly and shifted smoothly, it will last a long time even with a high torque engine bolted up to it.If it's driven rough and shifted improperly, it will break even with an END673 170 hp engine bolted up to it.Personally, I'd keep the quadbox. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-11755 Share on other sites More sharing options...
Freightrain Posted April 15, 2007 Share Posted April 15, 2007 There is a fellow in Ohio that bought a LTL that had a big Cummins and a quad box in it. Ya, talk about overpowered, but like HK says, it's all in the driver. Keep the power level smooth and it will survive. Hotrod it once and ya it'll come apart real quick. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-11764 Share on other sites More sharing options...
michael57 Posted April 15, 2007 Author Share Posted April 15, 2007 There is a fellow in Ohio that bought a LTL that had a big Cummins and a quad box in it. Ya, talk about overpowered, but like HK says, it's all in the driver. Keep the power level smooth and it will survive. Hotrod it once and ya it'll come apart real quick.Thanks for all the help sorry to be a pest but i don't know much about this old Mack but are learning fast thanks to all of you Regards R609 Quote Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-11766 Share on other sites More sharing options...
HeyCharger Posted April 15, 2007 Share Posted April 15, 2007 Hotrod it once and ya it'll come apart real quick.Surely my (HotRod) reputation has not reached the U.S. Quote Proud owner of;1961 Mack B61 prime mover.1981 International ACCO 1810C DualCab Fire Truck Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-11767 Share on other sites More sharing options...
Freightrain Posted April 16, 2007 Share Posted April 16, 2007 Oops.........Hot-rod it once................LOL! Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-11772 Share on other sites More sharing options...
jeffbyrne Posted May 13, 2007 Share Posted May 13, 2007 Hi i have a R609 RST with a TRQ7220 QUADBOX can anyone tell me what the turque rating is for this transmissiom and what HP motor can it take Thanks for all the help Regards Michael Also Rob have you had a cance to get anything on your 711 turbo, no hurry as i still have a lot to still do to it as only down to the chassis and hope to paint soon. When you get a chance can you message me with it thanks R609Im sure the torque rating of a TRQ7220 is 720lbs/ft. People have put them behind ENDT675's with a torque rate of 900+ Quote Link to comment https://www.bigmacktrucks.com/topic/2361-trq7220/#findComment-12169 Share on other sites More sharing options...
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