350 Vortec to 454 vortec - The 1947 - Present Chevrolet & GMC Truck Message Board Network

b454rat · 01-12-2017, 06:53 PM

I tried searching all day but it's a pain on an iPhone. I have a tired 350 in my 99 crew cab, and local junkyard has a 99 3500HD with a good running 454. Some places I've read said it was pretty much plug and play, others said it was a total nightmare. I know the ECM wiring should be the same, just dunno bout connectors and what not. Gonna stay with auto for now. I can get the whole truck for $1500, 454, NV4500, clean title and body. Plus later on down the road, I wanna build this truck up...

Tom · 01-12-2017, 07:19 PM

I highly doubt its a total nightmare. Its same generation, same setup basically. Should be tons easier then an LS swap and people do those all the time.

b454rat · 01-12-2017, 07:29 PM

Since they are basically the same truck, can't see why it would be so difficult. Also since they are both 3/4-1 ton, the wiring should be the same from the ECM. Found out from last couple 1/2 tons that tho ECM might be the same the wiring coming out of it is different. I'm gonna go look at it again this weekend, go from there...

b454rat · 01-14-2017, 01:29 PM

Put money down on it so it won't go anywhere. After talking to owner bout it, I think it's the clutch or hydraulics and not the tranny. He tried to move it, and couldn't get it to into gear, or once in gear to get it back out. He had to shut it off to go in/out. But after he pumped the clutch couple times, I get it when in and out. For what ever reason the bell was replaced, so thinking maybe they screwed something up, or the throw out bearing or slave is bad.

TwoFiftyShifter · 01-14-2017, 07:31 PM

I have toasted a manual tranny and it was easy to tell with the car off that it was toasted. Sounds clutch related. Sounds like a good deal. A Vortec 7.4 and 4500 trans are both $$$ to get a hold of.

b454rat · 01-14-2017, 09:39 PM

I've had 454s, one Vortec and it was a beast. All stock too. Only had 1 stick truck and that was a carbed 454 4-speed, and an absolute blast to drive. So this would be nice in my crew. I'm thinking something stupid as well, just wish I could do something soon with it, but have no garage to do anything!!! I could prolly sell this truck even with no motor, there is no rust on it. And being from NY, that's rare!!!!!

01-12-2017, 06:53 PM	#1
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	350 Vortec to 454 vortec I tried searching all day but it's a pain on an iPhone. I have a tired 350 in my 99 crew cab, and local junkyard has a 99 3500HD with a good running 454. Some places I've read said it was pretty much plug and play, others said it was a total nightmare. I know the ECM wiring should be the same, just dunno bout connectors and what not. Gonna stay with auto for now. I can get the whole truck for $1500, 454, NV4500, clean title and body. Plus later on down the road, I wanna build this truck up... __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"

01-12-2017, 07:19 PM	#2
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,763	Re: 350 Vortec to 454 vortec I highly doubt its a total nightmare. Its same generation, same setup basically. Should be tons easier then an LS swap and people do those all the time. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

01-12-2017, 07:29 PM	#3
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	Re: 350 Vortec to 454 vortec Since they are basically the same truck, can't see why it would be so difficult. Also since they are both 3/4-1 ton, the wiring should be the same from the ECM. Found out from last couple 1/2 tons that tho ECM might be the same the wiring coming out of it is different. I'm gonna go look at it again this weekend, go from there... __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"

01-14-2017, 01:29 PM	#4
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	Re: 350 Vortec to 454 vortec Put money down on it so it won't go anywhere. After talking to owner bout it, I think it's the clutch or hydraulics and not the tranny. He tried to move it, and couldn't get it to into gear, or once in gear to get it back out. He had to shut it off to go in/out. But after he pumped the clutch couple times, I get it when in and out. For what ever reason the bell was replaced, so thinking maybe they screwed something up, or the throw out bearing or slave is bad. __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"

01-14-2017, 07:31 PM	#5
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: 350 Vortec to 454 vortec I have toasted a manual tranny and it was easy to tell with the car off that it was toasted. Sounds clutch related. Sounds like a good deal. A Vortec 7.4 and 4500 trans are both $$$ to get a hold of. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

01-14-2017, 09:39 PM	#6
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,485	Re: 350 Vortec to 454 vortec I've had 454s, one Vortec and it was a beast. All stock too. Only had 1 stick truck and that was a carbed 454 4-speed, and an absolute blast to drive. So this would be nice in my crew. I'm thinking something stupid as well, just wish I could do something soon with it, but have no garage to do anything!!! I could prolly sell this truck even with no motor, there is no rust on it. And being from NY, that's rare!!!!! __________________ 2000 Chevy Tahoe Limited 3/5" drop 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon stock SAS 6"



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