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: How much TQ can the 5 sp allison handle? benz_020 08-09-2005, 04:44 AM How much TQ can the 5 sp allison handle? i didnt see it in the pinned FAQ thread i wish it could handle 1650lb like in the semi's automatics michael nelson 08-09-2005, 04:52 AM I heard 800 lbs tq but dont quote me benz_020 08-09-2005, 05:28 AM I heard 800 lbs tq but dont quote me well im far past that....for quite a while now...... lol so definatly more but thanks Machinator 08-09-2005, 07:26 AM The 5-speed can handle 800 ft-lbs of input torque, the 6-speed can go up to 900. benz_020 08-09-2005, 12:57 PM well that sucks is that 800 constant or max? and i assume that dose not include 5th gear Machinator 08-09-2005, 01:09 PM 800 is constant, if it was the max there would be a lot of broken transmissions out there. I'd image you'd only see those numbers in the lower ranges, that's why they have to limit the engine torque. Scotty Seelen 08-09-2005, 04:36 PM Gears 1-4 = 900 lb-ft. Gear 5 = 680 lb-ft. Got Juice? 08-09-2005, 05:38 PM Allison Specs indicate a GROSS (flywheel) input torque of 650 LBS-ft Of course, some here are a teeny bit beyond that. Mike L. 08-09-2005, 10:37 PM I think a lot of it depends on how good your stock converter locks the clutch. A strong locking clutch takes a big load off the clutches inside the Ally. This will give you a much stronger coupling. IMHO this is why some Duramaxes can run a bigger hp program without limping than others. As far as what their rating is; it don't mean squat. If you are towing big loads you need a good trople converter and a Transgo shift kit along with the proper synthetic fluid and a good cooler. I believe if you do this, along with proper fluid and filter changes as I prescribe, your Ally is good for 250K trouble free miles. mike benz_020 08-09-2005, 11:51 PM i dont haul much any more and nothing heavy for this truck. ive just got addicted to the Drag :cool: | ||