Hey guys. A friend of mine is getting ready to yank out his old motor and tranny from his 1995 suburban 4x4. He has a 6.0/4L80E trans from a 2003 chevy HD truck. Now before he just jumps into it and gets stuck I wanted to chime in for him here and find out if anyone can help. I tried to post at LS1truck like it was for myself but but really didn't get much help. So far he is going to order s&p motor mount adapters. I reccomended speartech for the harness and computer work.What he is not sure of is trans crossmember, transfer case, electronic shift, exhaust, factory gauges functioning and finally what fuel line mods need to be made. He also needs to find a throttle body that will work that will provide a throttle cable. Well guys thats all I can remember for now thanks in advance for your help and maybe he will get lucky here and find the answers he needs.

 

Well it sounds like a nice project, yeah I am pretty sure the s&p motor mounts will work, but not sure since they are designed for an old school sbc. They should though. As far as the t-case, I am assuming its an np241 and the tranny is a 4l80e and a 4x4 model. If so then gm makes an adapter that mates the np241 and 4l80e to each other. So since you are using the stock transfer case and not moving it forward or backward, you will get to keep the stock driveshafts and crossmember in the stock location. The only thing you will need to do, is since the output shaft on the 4l80e is a 32 spline shaft, and the input shaft on your t-case is a 27 spline, you will either need to get a t-case out of a 1 ton 4x4 chevy, or just change out the input shaft with a 32 spline shaft. Hope that makes sense. For the fuel system, you will need to get the quick disconnect fittings that go to the manifold and snip off a good length where it starts to go back under the fire wall, and then snip off the original lines where they lead to the fire wall. Then just some hydraulic compression fittings and mate the 2 lines together since the feed and return are the same size lines. Then you will need to take out the pump and sender assembly from the tank, and install a 98 or 99 vortec style pump on your sender unit. Its not hard, it should be a direct fit. As far as shifting the tranny is concerned, you will need to install an aftermarket shifter because the arm that shifts a 4l80e is longer in comparison to the arm on a 4l60e, and is also "throws" or shifts in the opposite direction so the collumn shifter will not work. I used a b&m truck megashifter and it works great. As far as the exhaust goes, you will pb need to have the exhaust flanges redone and o2 sensor bungs put in as close as you can to the new manifolds. For a cable controlled throttle body, it might be more trouble than its worth to have it converted to a cable drive. I strongly recommend using speartech to have your harness made or redone. They are second to none and have excellent tech support and you can discuss with them the options and your questions about the drive by wire/cable and also the gauges and how they will function. Let me know if you have anymore questions because about 3 months ago I just completed basically the same engine swap, but in a 91 fullsize blazer. FWIW I have an extra transfer case/transmission adapter left over from my swap that I could give you for fairly cheap. Since they are over $300 new I thought I would mention it since every little bit counts.

Regards,
Remington

 

as far as the fuel pump goes, a 97-99 pump is hard to buy without the entire sending unit since they are one piece from the parts store. You can use a pump from a 96 model tahoe or truck. they are the only year vortec that is a direct replacement for your tbi style sending unit without buying the whole thing. i got mine for 60 bucks new. hope that helps

 

you see that is why I love this place. The support here is awsome. Thanks for the info I will let you know as soon as I do on the transfer case issue.

 

ttt..... hey speartech are there any tricks on how to keep the electronic shift and throttle that you know of? And Remington H. Are there any easy ways for him to tell if it is in deed a np241 transfer case? Thanks again guys.

 

No problem keeping the electronic throttle, we're doing those all of the time now. When you get to the 4WD stuff, I don't know much about it.

 

Remington, I have a 94' F/S Blazer and want to put the LQ9 and 4L80 from a 2002 or newer Escalade, into it. Do you think I will have problems because of the Escalade being an AWD? I believe I have a 4L60 in it right now.

 

sending pms

Remington

 

Hey everyone sorry for the space in posts. My buddy wants me to ask how much of a chore it would be to get the 6.0 engine to mount up to his tranny that is already in the truck. If I am not mistaking its a 700r4.(Correct me if I am wrong) We have'nt gotten any definite answers on making that darn electric shifter operate without using a late model steering column and shifter. Thanks for the help all.

 

the 95 should be a 4l60e trans and the electric shift that you are speaking of is on this transfer case itself to control the 4 wheel drive functions. The trans in that truck is cable shifted,the first year for that, so the throw on the shifter would be the same

 

So then it would be an easier swap to just mount it up to the trans thats in the truck? I remember the transfer case having the electronic shift pack but there was one on the side of the trans as well. Is it possible the trans he has is not a 4L80E? I remember when we dropped the trans out of my buddies 2001 silverado to get it gone thru it had the same pack on the side of it.

 

Yeah your truck has a 4l60e. I think he is trying to say that the arm that the cable is connected to on the tranny is the same length or throw as the 4l80e. So if you still wanted to, then you could swap in a 4l80e(which would still take very little effort compared to adapting and beefing up a 4l60e to take the abuse of a 6.0. On the other hand, if your friend is set on using the original tranny, then he will need to contact advance adapters. I am pretty sure they sell a kit that allows it to bolt up. For wiring, it will be another story though. Because if I am not mistaken, you will have to have the transmission programs disabled in the 6.0 computer and those wires taken out of the wiring harness, and also keep the wiring and computer from the original wiring on the truck. So technically you will have 2 wiring harnesses and 2 computers controlling everything. Or I bet you could just get a transmission controller from B&M or something. Sorry but that just sounds like a mess to me. Not to mention that my 700r4(same as 4l60e) in my k5 w/a tbi 350 had to be rebuilt with only 100k miles on it, and that tranny was designed with that engine in mind. The 6.0 came from the factory with a 4l80e for a reason, trust me. And yes the newer and brand new trucks have the same hookups for the sensors, but there are slight differences between all years like the pulses that are sent back and forth, frequency of pulses, voltage, etc, etc...

Remington

Remington