If youve added significant hp and torque to the cars engine output and are thinking of upgrading the 700r4 or 200r4 , with aftermarket parts,those transmissions are designed to handle about 350ft lbs of torque in the factory original condition and upgraded components will generally boost that to handle about 450-550ft lbs, WITH all the better parts, and a decent oil cooler,but if youve built a supercharged or nitrous enhanced big block combo... save the time and effort and cost, theres NOTHING you can do to a 700r4 or 2004r that will allow them to compete strength wise with a similarly upgraded 4l80E the component size alone dictates that the larger heavier components in the 4l80e, if heat treated to the same strength, will far exceed the smaller components in the other transmissions, its HEAT , IMPACT LOADS AND TORQUE that destroy transmissions NOT hp.
now that obviously does not mean that you cant significantly increase the durability of your current transmission with better aftermarket components, but at some point your torque curve will dictate the swap to the larger and heavier transmission.. youve generally reached that point if your shredding rebuilt transmissions with the aftermarket components
HP= torque x rpm / 5252, so
350ft lbs at 9000rpm =600hp
600 ft lbs at 5300rpm=600hp
guess what the loads and wear differ a great deal
stock 4l80e
http://media.gm.com/division/2004_prodinfo/powertrain/automatic/index.html
stock 700r4/4l60e
http://media.gm.com/division/2004_prodinfo/powertrain/automatic/index.html
http://www.carcraft.com/techarticles/cc ... index.html
700r4 is 134lbs
4l80e 174 lbs. or more depending on version
that extra 40 plus lbs is the result of more massive parts
you might want to read this thread also, notice that all three guys swapped to a modified 4l80e
viewtopic.php?f=86&t=1397
now that obviously does not mean that you cant significantly increase the durability of your current transmission with better aftermarket components, but at some point your torque curve will dictate the swap to the larger and heavier transmission.. youve generally reached that point if your shredding rebuilt transmissions with the aftermarket components
HP= torque x rpm / 5252, so
350ft lbs at 9000rpm =600hp
600 ft lbs at 5300rpm=600hp
guess what the loads and wear differ a great deal
stock 4l80e
http://media.gm.com/division/2004_prodinfo/powertrain/automatic/index.html
stock 700r4/4l60e
http://media.gm.com/division/2004_prodinfo/powertrain/automatic/index.html
http://www.carcraft.com/techarticles/cc ... index.html
700r4 is 134lbs
4l80e 174 lbs. or more depending on version
that extra 40 plus lbs is the result of more massive parts
you might want to read this thread also, notice that all three guys swapped to a modified 4l80e
viewtopic.php?f=86&t=1397