tbi 454/700r4 swap from carb 383/700r4 originally tbi350/4l60e

[shane300zx]

Well retyping this again. Hit submit thread and lost everything i typed. What a mess from the title huh? Heres the deal brother yukon was 1995 5.7 tbi 4l60 truck. Decided to do a carb 383 and keep the 60e. Truck did fine for several years until the 60e gave up. Came down for a funeral and replaced the 60e with a 700r4. Back up and going again. Now the cam decided to lay down on it. Ive come across a good deal on a bone stock 454 crate engine and have all the stuff to tbi it. I have 8 months to sort out the ecm deal as i know they never offered a 700r4 behind a 454. The plan is to use the tbi ecm he has now with the harness thats in the truck to control the 454 and 700. Im aware of the differences in iac wiring that dont concern me too much.I only have a week and a half to do the swap and dont wanna run into too much un needed trouble as ill be 1000 miles from him after i leave. Im thinking i could use a stock 7.4L program with manual trans code to make the 700 work. I have some moats burning stuff here but have never burned a chip. If someone could point me in the right direction that would be great. I know this post is short but the one i lost was about 4 paragraphs sorry.

[EagleMark]

7.4L and a stock 700r4 = will be doing tranny soon...

What PCM? If a 16197427 then there are hacks for 700r4.
http://www.gearhead-efi.com/Fuel-Inj...Information-OD

[CDeeZ]

7.4L and a stock 700r4 = will be doing tranny soon...

I agree with Mark. Personally I would not even try to put a 700R4 behind a 454, I know there are people who have done it, but I think you would be miles ahead to just put a 4L80 behind that big block. The 4L80 is basically a big ol' beefy TH400 with an overdrive gear and the provision for a lockup torque converter.

A T56 would be sweet behind that 454 as well, and not too terribly involved to swap one in, if you didn't have you heart totally set on the automatic that is.

[gregs78cam]

I agree also a stock 700R4 behind a bone stock 454 won't last a real long time but if you go through it may last a quite a while with the right parts in it. But........

I would vote for the 4L80e as well, only issue is if this vehicle is 4WD then getting the t-case to mate up will take some work/swapping. But the 4L80e is a sweet trans, and the stock ECM will handle it.

[dave w]

I think maybe use the carburetor on the 454 crate engine? Then later on when the 700R4 gives up, install the TBI and 4L80E then. Keeping the carburetor helps the budget and saves time.

My personal choice for the Yukon, would be nothing like most people would do. I would use the 1996 ~ 2000 454 Vortec MPFI intake on the 454 crate engine. I would modify the original 95 Yukon computer for MPFI mode, and install a 4L80E.

The pics below are a few years old, from a 454 Vortec conversion I did.

dave w

[shane300zx]

Ive thought about the carb setup but......He uses this thing on the trails somewhat hard. We have vids of it pulling the left front tire off the ground coming out a serious mud hole. T56 is not an option with a 4wd truck. PACT raptor level 2. The trans has been beefed up quite substantially 13 vane front pump hardened input shaft 9 clutches and steels in the 3-4 pack and on and on. . He has droped some serious coin in the trans so i think he is gonna stick with that. DAVE W i bet he would love the mpfi 454 setup in his truck but it still requires another injection system and another trans. Like your engine test stand tho. Check out mine!

http://youtu.be/xPpQ2afq7VI

[CDeeZ]

Nice pics dave, thanks for sharing.

I understand if you guys don't want to use a T56 for the truck, there is nothing wrong with that, but it definitely is an option. There are plenty of folks out there who have done it. This 4x4-T56 is not my picture but it does illustrate that a 4x4 T56 is a very real possibility. DSC01587.jpg


I remember when I was running the 700R4. I blew it up once with my little tree-fitty, then decided to tackle rebuilding it myself. While it was quite the challenging adventure, it worked good up until the point that I tossed it in favor of the T56.

There are different schools of thought on the 3/4 clutch pack in the 700R4 which seems to be very prone to failure. Some people are of the opinion that adding more clutches to that clutch pack will help increase the holding power. Other people believe that the added holding power of using additional clutches there is negated by the fact that clutches and/or steels are usually thinner to make room for the additional friction elements. A big-ass transmission cooler is your friend.


Here's a couple pics of me rebuilding my old 700R4, and one pic of me holding some torched clutches that necessitated the rebuild.


DSCF3621.JPGDSCF3626.JPG

[JeepsAndGuns]

I remembered seeing a ad in some hot rod or maybe 4x4 mag at one time for this place:
http://www.rsgear.com/about-us/press...up-trucks.aspx

Just google T56 4x4, you will find a lot of info.

[shane300zx]

Cool t56 and a tcase! If i remember right a t56 has a ftlbs cap around the 450-500 range. I could see it getting broke real quick in this truck. A little more info on my behalf. The video that i posted is the current motor in the truck. it was quite fun till you hit the trails and get it leaned over and starts flooding. The act of the massive amounts of gas being dumped into the motor wile flooding coupled with the large cam that causes blower surge makes for a very scary ride when you are trying to control the truck and all it wants to do is go. it has 10" of lift on 38x15.5x16 boggers 14 bolt rear and am pleased to say the ifs is holding up. Like i said a carb would be great but he is tired of it loading up on him when he climes embankments. we tried a truck avenger carb and it really didnt make any improvement over the dominator carb. We would put another cam in it and go again but like i said he is tired of the problems with the carb on the trail. He is putting this motor back in his chevelle.
Im not knocking the idea of the t56 but with the big block stuck in a hole i could see coming off the clutch at 4000rpm and hearing some serious metal breaking. JeepsAndGuns he lives in your sister state and is the typical redneck as they have dubed us that like to ride 4 wheelers drive out trucks in the creek and drink our beer lol. He actually bought the pact lever 2 tranny that cost him near 2600 when it was in so he will stick with that. I just saw a bin on here by fast355 that was using the same 16197427 ecm in the $OD mask <what ever that is> witha 700r4 and a 5.7L. So i assume one could copy the stock 7.4L bin in the 350 place. Again i dont know this is all new to me.

[EagleMark]

I just saw a bin on here by fast355 that was using the same 16197427 ecm in the $OD mask <what ever that is> witha 700r4 and a 5.7L. So i assume one could copy the stock 7.4L bin in the 350 place. Again i dont know this is all new to me.

Mask is the Bin Definition/XDF file you use to change things in Bin file. You could change all paremeters in that bin to 7.4L.

[CDeeZ]

The T56 is conservatively rated at 450-LB/FT TQ. There are tons of people out there pushing bone stock T56s well beyond that power level. And with a some internal upgrades it can easily be capable of sustaining close to the magical 1000 HP mark. Also, I know somebody from another forum that I visit who put a T56 in his 'burb and tows with it regularly: he made a 1,000+ mile trip towing a trailer loaded down with about 5000 LBS, four people, and all their gear, no problems whatsoever.

Whatever the case it sounds like a sick ride that you and your brother got there, so please do share the info with us as it continues to come together. There are lots of very talented and helpful people on this forum so I'd say stick around!

[JimmyRon]

Oh sweet, that thar is a gen-u- wine Redneck engine test stand, love it Bro, a big thumbs up!

[JimmyRon]

I think maybe use the carburetor on the 454 crate engine? Then later on when the 700R4 gives up, install the TBI and 4L80E then. Keeping the carburetor helps the budget and saves time.

My personal choice for the Yukon, would be nothing like most people would do. I would use the 1996 ~ 2000 454 Vortec MPFI intake on the 454 crate engine. I would modify the original 95 Yukon computer for MPFI mode, and install a 4L80E.

The pics below are a few years old, from a 454 Vortec conversion I did.

dave w

That thar is a gen-U-wine redneck engine test stand, a big thumbs up Bro!

[dave w]

That thar is a gen-U-wine redneck engine test stand, a big thumbs up Bro!

Don't tell anyone where I work that I put together a gen-U-wine redneck engine test stand. My co-workers would think it was a complement, and get jealous!

dave w