5.3 swap with 4l80 transmission

[Lower]

My engine came out of a 2000 3/4 ton, 5.3 4l60, has the tag on the cowl to match. I was told the only 5.3's that had the 4l80 were in vans....

[hugger6933]

well as I said I have never seen a 5.3 in a 3/4 ton I have also never seen a 4l60e in a 3/4[ in that body style]. The van gvw's are rated a little different and they did have different motors avaible. I have seen 4.3 v-6's with a 4l80e behind it . One of the moving companys had some built[they have yellowtrucks] it will be easy to determine as all it takes is to look at the motor ,the size is stamped on it on the back and the sides. and no pcm or wiring would have to be changed out to work. In fact you can take out a 4.8 and replace it w/5.3 or 6.0 or vice versa. it won't run perfect I would suggest a reflash but it will go.

[hugger6933]

I will step in the kitchen for a knife and fork to eat some crow after my last post where I once again said I've never seen one I went to GM parts express and plugged in a 00 model 3/4 and it does list the 5.3 I was WRONG and I am sorry if anyone was messed up in any way from my misinformation

[FL71C10]

Originally Posted by hugger6933

I will step in the kitchen for a knife and fork to eat some crow after my last post where I once again said I've never seen one I went to GM parts express and plugged in a 00 model 3/4 and it does list the 5.3 I was WRONG and I am sorry if anyone was messed up in any way from my misinformation

tastes like chicken!

[bbadfred]

Originally Posted by hugger6933

I will step in the kitchen for a knife and fork to eat some crow after my last post where I once again said I've never seen one I went to GM parts express and plugged in a 00 model 3/4 and it does list the 5.3 I was WRONG and I am sorry if anyone was messed up in any way from my misinformation

I wish I had ten bucks for everytime I was wrong!!!!!!!!

[mcbassin]

Originally Posted by bbadfred

I wish I had ten bucks for everytime I was wrong!!!!!!!!

I could retire if I had $10 for every time I was wrong
Posted via Mobile Device

[clinebarger]

Originally Posted by hugger6933

I will step in the kitchen for a knife and fork to eat some crow after my last post where I once again said I've never seen one I went to GM parts express and plugged in a 00 model 3/4 and it does list the 5.3 I was WRONG and I am sorry if anyone was messed up in any way from my misinformation

It was an option in 1999 & 2000 to have a LM7 5.3L in a 2500 truck. 5.3L's were never offered in a 2500HD truck. Ive never seen one in a 2500 truck either.

The 5.3/4L80E combo is a whole other can of worms......

99 & 00 LQ4 6.0L are different than 01 & up 6.0L's, The rear crank flange is longer than any other gen III engine, Also the only one to have iron heads.
The longer crank flange was designed for use with the 4L80E transmissions converter spacing. 01 & up LQ4 6.0L's use a spacer to deal with the converter spacing, Because the LQ9 came out with a 4L60E/4L65E

So does a 99/00 2500 LM7 5.3L have a MT1 4L80E behind it.....I dont think so. It would have 4L60E..........Untill someone can show RPOs LM7 & MT1 on the same RPO sheet.....There is no proof.

[FL71C10]

I'm going to go look at it tomorrow, so we'll see if I can figure out what's what.