[455bird]

My 6.0 LQ4 was set up to run a 4l80e. I’m putting a 4l60e in the car how do I order a flex plate for the l460e with a 6.0. parts place said that don’t show a 4l60e hooked to any 6.0. Do you have a part number for the flex plate I need?

 

[novaderrik]

should be the same flexplate across almost all the LS engines. i think some of the newer ultra high performance engines (LS7, LS9, etc) use a different flexplate due to a different bolt pattern in the crankshaft.

 

[455bird]

ok but dont the 4l80e have six torque converter bolts and the 4l60e only has three? also my LQ4 is a 1999-2002 and the trans is a 2002

 

[novaderrik]

maybe, but 3 is half of 6, so it should still bolt up with 3 of the holes not used.
since it is a 6.0- an engine that only ever came stock with a beefier trans than the 4l60E- maybe your existing flexplate has the 6 holes already..
crawl under the car, remove the inspection cover, and have a look.

 

[DerekHead]

The 4l80e is similar to gen-1 style automatics and thus sits further away from the motor. GM created a spacer in order to adapt the 6.0L and other ls based motors to this trans. The spacer works to connect ls style motors to old style transmissions as well (TH350, TH400, 200r4). However since you are swapping for a newer style transmission I believe you need an ls1 style flat flexplate with no spacer. TCI PN 399753 or use stock gm flexplate for ls/4l60e not the ls/4l80e flexplate your motor may have come with.

More info can be found here

http://www.ls1tech.com/forums/autom...-style-trans-th350-400-2004r-700r4-4l60e.html

http://www.carcraft.com/techarticles/ccrp_0810_engine_transmission_swap_gen_3/torque_specs.html