GMT 400 W/T

bigcountry78 said:

I keep thinking about this thing. My son just turned 10, and he likes the body style of these truck. Might be something we can get fixed together, and be a first truck for him. So, has anyone ever pulled a 4.3 and swapped a 5.7 in one of these trucks? I can’t imagine there would be a tone of difference, since the trucks were offered with both. Any input? I’ve also thought about maybe rebuilding the 4.3. If nothing else, I may drag it home and pull the top end off of the motor and see what it looks like.

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Ricko1966 said:

The 5.7 will go in real easy same transmission. I believe the same mounts,all the brackets and accessories swap. I think all its going to take is the 5.7 a prom for a V8 truck, probably a different fan shroud, if you use exhaust manifolds from a gmt with a small block I bet the exhaust even hooks up. The 4.3 is basically a 350,with the front 2 cylinders removed.

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squaredeal91 said:

I'll add that the fan shroud will be too big. V8 ones are everywhere tho

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bucket said:

A saw will work too

It's way easier to make a big shroud small, than a small shroud big, lol.

Reminds me of a totaled '88 C1500 that a coworker had bought and repaired in the late 90's. He used a v8 shroud on the v6 truck. It was the dead of winter and we needed to move it for one reason or another. I put the jumper pack on it, he started it and I went to remove the jumper pack... somehow my hand ended up near the cooling fan and a couple fingers got bit by the fan. The cold weather made it feel SO much worse, lol.

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bigcountry78 said:

I keep thinking about this thing. My son just turned 10, and he likes the body style of these truck. Might be something we can get fixed together, and be a first truck for him. So, has anyone ever pulled a 4.3 and swapped a 5.7 in one of these trucks? I can’t imagine there would be a tone of difference, since the trucks were offered with both. Any input? I’ve also thought about maybe rebuilding the 4.3. If nothing else, I may drag it home and pull the top end off of the motor and see what it looks like.

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Grit dog said:

I’ll beat the GMT400/OBS bandwagon all day long with you. Still think they’re one of the best overall combinations of capability, reliability, looks, modern/comfort and easy/economical to repair. To this day…
And they’re going up in value, not down. Pre-classics if you will.
But I’ll be the voice of reason too. You said it last year, that truck is junk. And if it wasn’t, it is now if it’s still been just sitting. Gotta know when to walk away….
There’s 6 or 9 billion GMT400s out there. Which means there’s a FAR better deal or platform to start with all the way up to super clean need nothing trucks to be had.
Like the boat, time to be like the Frozen song and Let it go!

If you just want something that is cheap, beat up, but not rotted out and still runs, those are dime a dozen.

There’s still tons of nice ones out there too. Just harder to score a deal on those.

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bigcountry78 said:

You know, you’re right. And that’s why I like y’all, you’re down to earth and realistic about these sorts of things. The last thing I need right now is a time/money pit and another headache. Thanks for steering me straight lol.

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