i have searched and searched on this for a long time and haven't found this specific question so here it is. When doing the swap does the engine that is to be put in, have to be the same year as the engine you are taking out? and if not can you downgrade from , say a 2004 to a 2001? I have found a lq9 and 4l80e for $1800 and am looking to drop it in ASAP. Also I am looking to go with forged internals(planning ahead...for the FI)what are some good kits to get.Any input will be appreciated.

 

you can swap em.....i'm doing a 4.8<------>6.0 swap.....my 4.8 is a 03 and the 6.0 is a 02......you just got to get the ecu reprogramed to accept the 6.0......wait4me does it cheap and realiable from what i hear......

 

I have an '01 RCSB 4.8 and im also looking at doing a 2003 LQ9 swap into my hog.

 

i'm not sure if mine is a lq9 or lq4......i put a H.O. cam in it.....having the heads worked......and does any know where i can get a freakin tb.....i got one off of ebay and it's the wrong one......it has throttle cable connections and the newer engines don't use throttle cables.....ARGH!!!!!!!!!!!

 

No problems on the engine swaps, regardless of size, as long as it is a GenIII motor ( 4.8, 5.3, 5.7, or 6.0 combo ). The 4L80E will require some mods to the crossmember if you are coming from a 4L60. There are a few folks who make conversion kits on here.