c10 454/th400 conversion ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mschm22 · 07-12-2009, 10:34 PM

I have a 72 C-10 LB and I'm looking to convert from my 307ci/sm465 to a 454ci/th400 setup. Someone locally is selling a 454/th400 setup out of a 76 Motorhome/RV. Is there any real differences with a RV motor or trans? And how difficult is the swap? Any advice? All help is greatly appreciated. What would be a fair price to offer him for it? I do understand some of the things I will need for the conversion like-

radiator upgrade
motor mounts
brackets
brake pedal for automatic?
shifter

http://67-72chevytrucks.com/vboard/i...lies/imnew.gif

JimKshortstep4x4 · 07-13-2009, 05:12 AM

Does the TH 400 transmission have a short tail shaft?

The engine and transmission will fit in the truck as the trucks came with 402/TH 400 as an option. The swap should not be that difficult. The frame mounts for the 72 big block are getting harder to come by but they are available. You can use your existing brake pedal and just remove the clutch pedal and linkage.

If you swap out your column to an automatic column then it will be easier to match up the shift linkage. Also, the neutral safety switch and back up lights will be on the column. Wiring in the switches is not to big of an issue.

Jim

BossHogg69 · 07-13-2009, 09:56 AM

does the TH400 have a bolt on yoke? I'm guessing your truck has a 2 pc driveshaft since it's a LB, which won't be a problem with a bolt in yoke TH400, but it is one thing that might need to be accounted for, since there may need to be some driveshaft work done to get it in.

07-12-2009, 10:34 PM	#1
mschm22 Registered User Join Date: Jun 2009 Location: Taylor, MI Posts: 7	c10 454/th400 conversion ?? I have a 72 C-10 LB and I'm looking to convert from my 307ci/sm465 to a 454ci/th400 setup. Someone locally is selling a 454/th400 setup out of a 76 Motorhome/RV. Is there any real differences with a RV motor or trans? And how difficult is the swap? Any advice? All help is greatly appreciated. What would be a fair price to offer him for it? I do understand some of the things I will need for the conversion like- radiator upgrade motor mounts brackets brake pedal for automatic? shifter http://67-72chevytrucks.com/vboard/i...lies/imnew.gif Last edited by mschm22; 07-12-2009 at 10:38 PM. Reason: to change title

07-13-2009, 05:12 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: c10 454/th400 conversion ?? Does the TH 400 transmission have a short tail shaft? The engine and transmission will fit in the truck as the trucks came with 402/TH 400 as an option. The swap should not be that difficult. The frame mounts for the 72 big block are getting harder to come by but they are available. You can use your existing brake pedal and just remove the clutch pedal and linkage. If you swap out your column to an automatic column then it will be easier to match up the shift linkage. Also, the neutral safety switch and back up lights will be on the column. Wiring in the switches is not to big of an issue. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

07-13-2009, 09:56 AM	#3
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: c10 454/th400 conversion ?? does the TH400 have a bolt on yoke? I'm guessing your truck has a 2 pc driveshaft since it's a LB, which won't be a problem with a bolt in yoke TH400, but it is one thing that might need to be accounted for, since there may need to be some driveshaft work done to get it in. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!



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