1994 Z71 5.7 TBI swap

[94Z71]

I am looking for advice on my swap.
I'm in the early planning stages of a LS1 swap in my truck.
Can I use my existing transmission or should I upgade both ? (180,000 miles)
Should I be looking for a Corvette LS1 or a newer LS1 truck motor.
I have seen in a few posts the brackets work better on the vette setup, Is that the case with the truck LS1 ?

[92 6.0]

First off welcome. Second I just got done putting an 05 6.0 in my 92 z71 and i used all truck acc. I would also advise putting in a new trans if your at all bit nervous about your current one. Its amazing the difference in power these new engines make. Also this thread is very very helpful. http://www.ls1truck.com/forums/lsx-t...onversion.html

[94Z71]

i have the bed pulled, engine stripped and ready to pull. I'll pull the nose clip today to give me all the room I need.
What trans do you recommend..sounds like you have the same set-up. The existing trans and transfer case are showing wear and leak out the shaft seals so I'll need to change them as well.

[92 6.0]

If you want to keep it simple your best bet would to be Rebuild your trans and replace the seals in the transfer. I put a 4l80 in mine only because I got it for a heck of a deal and it came with a Transfer case. I believe its whatever you can afford and what you prefer.

[94Z71]

thanks, sounds like a plan. I'll keep the post up as I progress or digress.
I've done engines but never a LS1 swap. should be fun.

[GMC1994]

First off welcome. Second I just got done putting an 05 6.0 in my 92 z71 and i used all truck acc. I would also advise putting in a new trans if your at all bit nervous about your current one. Its amazing the difference in power these new engines make. Also this thread is very very helpful. http://www.ls1truck.com/forums/lsx-t...onversion.html

Just came across this posting and I too am just starting my process.. 1994 GMC Sierra SLE Long Bed, 3/4 ton, 4X4, 4L80E(just had rebuilt so plan on keeping this a while), 5.7 TBI are the existing parts. Looking to swap a 5.3 or a 6.0 into the truck. So what you are saying is that I should be good to go with the 4L80E trans. But would this trans hold up to the new 6.0 LS?

[myzterray]

Just came across this posting and I too am just starting my process.. 1994 GMC Sierra SLE Long Bed, 3/4 ton, 4X4, 4L80E(just had rebuilt so plan on keeping this a while), 5.7 TBI are the existing parts. Looking to swap a 5.3 or a 6.0 into the truck. So what you are saying is that I should be good to go with the 4L80E trans. But would this trans hold up to the new 6.0 LS?

4l80e trans is prpbably one of the strongest trans u can get. def handle a 6.0 with ease. ive seen some guys running 800hp set ups with a 4l80 with no problem

[GMC1994]

4l80e trans is prpbably one of the strongest trans u can get. def handle a 6.0 with ease. ive seen some guys running 800hp set ups with a 4l80 with no problem

thanks for the info. with this tranny just being rebuilt about 3 hundred miles ago there is no reason to abandon this truck, just starting to learn the ins and outs. Also, easy enough year to work on without all the computer stuff. even with putting the ls swap in (5.3 or 6.0) looking for better gas mileage...... daily driver, about 75 miles a day.....and really like the truck...oh yea this forum is the best.....great advice!!
s

[myzterray]

thanks for the info. with this tranny just being rebuilt about 3 hundred miles ago there is no reason to abandon this truck, just starting to learn the ins and outs. Also, easy enough year to work on without all the computer stuff. even with putting the ls swap in (5.3 or 6.0) looking for better gas mileage...... daily driver, about 75 miles a day.....and really like the truck...oh yea this forum is the best.....great advice!!
s

Yea no problem. Thats the reason I did my swap. I was getting horrible mileage. Good luck with the swap. Any questions feel free to ask.

[slo92chevy]

You can use the existing trans you just need a different flexplate, but at least rebuild it cause thats alot of miles to have on a trans thats gonna have handle a stronger engine. Any LS engine is way better than the TBI crap, you can probably find the truck engines easier and cheaper than the vette. Good luck im just gettin started on my project, Cant wait to here it run.