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

[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.

[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