Slammed 1966 GMCummins 12v

[slimjim66]

Been a bit since I’ve posted, getting lots done on the truck. Interior is in, new carpet, sill plates and kick panel carpet.

[slimjim66]

Bed is all done

[slimjim66]

Wiring is complete as well, easiest wire job I’ve ever done. Gotta love the simplicity of the Cummins 12 valve.

[slimjim66]

Gonna send some parts off to powder coat this week, all these in satin black to match the willwood master cyl

[Dieselwrencher]

Very nice work. The only thing I think you may have issues with is that short exhaust. Your bed is going to be black and nasty in the very near future.

[slimjim66]

Originally Posted by Dieselwrencher

Very nice work. The only thing I think you may have issues with is that short exhaust. Your bed is going to be black and nasty in the very near future.

for sure it will be, i saved a few extra boards for the bed so i can run the exhaust out the back, when i get sick of being covered in soot.

[slimjim66]

Been a bit since I’ve given an update. Got parts back from powder coating.

[slimjim66]

Because I can’t leave well enough alone I decided to compound turbo the Cummins. It’s a Borg S475 over the stock holset. Along with the fun comes valve springs, head studs and a new head gasket. The rocker pedestal needed .200” taken off for rocker cover clearance.

[slimjim66]

Got everything back from powder coating again, I built the hot and cold side myself from 3” tubing. It was a tedious job but I got it done. Stuffed a intercooler in the front as well. With little grille modifications it fits perfectly behind there. I needed an external wastegate to give the little turbo a break at high RPM’s. It’s a 60mm precision gate that blows into the big turbo exhaust inlet. I’ve got no way of controlling max boost so a blow off valve or another wastegate might be in my future shopping cart at Summit. We will see…

[Ronzo]

Still one of my favorite builds man, well done.
Please come one out to Alberta some time to show it off.
Ron.

[slimjim66]

Forgot to mention, I’m using a 47rh tranny (4 speed with lock up converter) because I couldn’t get the TV cable to function properly I bought a full manual valve body from Muldoons Diesel. It works absolutely amazing, the manual VB with my pro ratchet shifter is an amazing combo. They have some sort of tranny dyno they run the VB on before it’s shipped. My 4th (OD) and lock up are run off 2 toggle switches on the shifter itself. And if your having a problem with the trans leaking at the dip stick tube, buy a Lokar anchor tight locking dip stick. Expensive but real nice piece. You have to drop the pan in order to get a backing nut on but it’s worth a clean floor.

[SCOTI]

Cool build & liking the updates.

[Dieselwrencher]

I have a little larry touche on my orange truck and I doubt I'd buy another. I could have done the same thing with semi seat switches just like you said. Your friend is correct. Any big truck shop will have a wide assortment of DOT fittings and a lot of them are plastic body with brass threads and are push connect. They usually always stock line and misc bags too.

On your constant pressure valve body, does it shift hard all the time? On my Corvette I have a constant pressure valve body as well with the TV wide open all the time. It's a pretty harsh shift at part throttle. I also used a lokar dipstick on both the vette and my orange truck. The locking dipstick sure makes it nice. They are sort of a pain to fill though since the opening is smaller than a standard tube.

[slimjim66]

no the valve body shifts good, its harsher than a stock shift obviously but its not crazy. I've been in some gas stuff that just hammers gears and it gets fairly annoying just cruising around town. with that being said if i shift with the converter locked up it will snap your head back lol, I've only done it a couple time by mistake but its a different feeling for sure. I'm really happy with the build so far, it cruises down the road so nice and the suspension seems to be able to handle the heavy ass cummins over top of it. you were right tho the back of my truck is covered in soot already, im already looking into putting a taller stack on.

Originally Posted by Dieselwrencher

I have a little larry touche on my orange truck and I doubt I'd buy another. I could have done the same thing with semi seat switches just like you said. Your friend is correct. Any big truck shop will have a wide assortment of DOT fittings and a lot of them are plastic body with brass threads and are push connect. They usually always stock line and misc bags too.

On your constant pressure valve body, does it shift hard all the time? On my Corvette I have a constant pressure valve body as well with the TV wide open all the time. It's a pretty harsh shift at part throttle. I also used a lokar dipstick on both the vette and my orange truck. The locking dipstick sure makes it nice. They are sort of a pain to fill though since the opening is smaller than a standard tube.