swapping the 4spd for a turbo 400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76PasoGMC · 04-10-2008, 04:48 AM

hey i was wondering what a project it would be to pull out the 4pd and install a turbo 400 in my 76 4x4 gmc stepside. I have a 350 with the NP205 transfer case.

just got a complete 76 Chevy C20 2wd camper special with the 454 turbo 400 in it free

thanks guys anyone need parts

76PasoGMC · 04-10-2008, 06:07 PM

Anyone??

Tony

Alex1 · 04-10-2008, 06:12 PM

Don't forget that the kickdown is electric so you will need to swap that out or buy a Lockar kit.

76PasoGMC · 04-10-2008, 06:19 PM

Ok Thanks that I didnt think about. Not super familiar with that care to elaborate

Russell · 04-10-2008, 06:49 PM

You'd have to modify that TH400 a fair bit to get it into your truck. The number one problem is that it is 2wd, and you'd need to change the output shaft to convert it, which will involve a total disassembly of the transmission...

72C203503ONTHETREE · 04-10-2008, 08:16 PM

Yep, plus the 400 is longer so you will need to move the crossmember, modify driveshafts, and find an adaptor to bolt the 205 to the 400. I think I am right about that at least.

04-10-2008, 04:48 AM	#1
76PasoGMC Registered User Join Date: Mar 2008 Location: Paso Robles, CA Posts: 43	swapping the 4spd for a turbo 400 hey i was wondering what a project it would be to pull out the 4pd and install a turbo 400 in my 76 4x4 gmc stepside. I have a 350 with the NP205 transfer case. just got a complete 76 Chevy C20 2wd camper special with the 454 turbo 400 in it free thanks guys anyone need parts

04-10-2008, 06:07 PM	#2
76PasoGMC Registered User Join Date: Mar 2008 Location: Paso Robles, CA Posts: 43	Re: swapping the 4spd for a turbo 400 Anyone?? Tony

04-10-2008, 06:12 PM	#3
Alex1 Registered User Join Date: Jul 2007 Location: Ottawa Ontario Canada Posts: 1,156	Re: swapping the 4spd for a turbo 400 Don't forget that the kickdown is electric so you will need to swap that out or buy a Lockar kit.

04-10-2008, 06:19 PM	#4
76PasoGMC Registered User Join Date: Mar 2008 Location: Paso Robles, CA Posts: 43	Re: swapping the 4spd for a turbo 400 Ok Thanks that I didnt think about. Not super familiar with that care to elaborate

04-10-2008, 06:49 PM	#5
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Re: swapping the 4spd for a turbo 400 You'd have to modify that TH400 a fair bit to get it into your truck. The number one problem is that it is 2wd, and you'd need to change the output shaft to convert it, which will involve a total disassembly of the transmission... __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) Last edited by Russell; 04-10-2008 at 06:49 PM.

04-10-2008, 08:16 PM	#6
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	Re: swapping the 4spd for a turbo 400 Yep, plus the 400 is longer so you will need to move the crossmember, modify driveshafts, and find an adaptor to bolt the 205 to the 400. I think I am right about that at least. __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.

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