455 swap into chevy - Pirate4x4.Com : 4x4 and Off-Road Forum

fallzy52 · 11-20-2007, 02:28 PM

I have come across an old buick with a 455 th400 for a good deal, i just blew up a carb 305 in my 81 3/4 ton 4x4. it has a th350 and a 203 full time. just wondering how a 455 would bolt into the truck. what are the big differences in chevy and buick parts, tranny motor mounts etc. thank you.

GMCTruxrule · 11-20-2007, 03:33 PM

Your choices are:
-find a new 350, much easier and less hassle
-install the 455 and mate it to your existing trans with an adapter from Advance Adapters
-Run the 455 and trans, but change out rear tailshafts and housings with a 4x4 TH400 tailshaft and housing.
Motor mounts not sure on, prolly not that big of a deal.

fredbuilt · 11-20-2007, 04:19 PM

I am not 100% sure but I was always told the 0lds 455, buick 455, and the chevy 454 were pretty much identical. I have a 454/th400 in my truck so if there is anything you wanna compare notes on tell me.

mondtster · 11-20-2007, 06:42 PM

Quote:

Originally Posted by GMCTruxrule

-Run the 455 and trans, but change out rear tailshafts and housings with a 4x4 TH400 tailshaft and housing.

Motor mounts not sure on, prolly not that big of a deal.

That is the way my buddy did it. He has an Olds 455 in a '50s Suburban that is sitting on a late '70s frame. The only thing I'm not real sure on is what he did for motor mounts.

r0nin89 · 11-20-2007, 08:30 PM

Quote:

Originally Posted by fredbuilt

I am not 100% sure but I was always told the 0lds 455, buick 455, and the chevy 454 were pretty much identical. I have a 454/th400 in my truck so if there is anything you wanna compare notes on tell me.

Nope buick/olds/pontiac motors are completely different.

79chevy39.5's · 11-20-2007, 08:42 PM

i would take what you got and find the olds 350 diesel motor mounts and then you got a drop in as far as motor mounts then youll want the bop t-400 with 4x4 tail shaft for the strenth and simplicity then just pop in a 205 because the 203 chains dont like abuse very much

GMCTruxrule · 11-21-2007, 10:38 AM

There are some things that are worth the time and money doing, but trying to figure out a way to throw some shit together is tough.
I would highly recommend going with a rebuilt 350 to replace your 305. Its a direct bolt in replacement. The 455 Buick is a torque monster for sure, and i would get the adapter from Advance adapters and run the existing trans that you have. If you really want to run the Buick motor.

the_experience3006 · 11-22-2007, 05:45 PM

$57.99 from Jegs

11-20-2007, 02:28 PM	#1 (permalink)
fallzy52 Registered User Join Date: Nov 2007 Member # 103212 Posts: 2	455 swap into chevy I have come across an old buick with a 455 th400 for a good deal, i just blew up a carb 305 in my 81 3/4 ton 4x4. it has a th350 and a 203 full time. just wondering how a 455 would bolt into the truck. what are the big differences in chevy and buick parts, tranny motor mounts etc. thank you.

11-20-2007, 03:33 PM	#2 (permalink)
GMCTruxrule Registered User Join Date: Aug 2005 Member # 51243 Location: Tropical Paradise Posts: 3,410	Your choices are: -find a new 350, much easier and less hassle -install the 455 and mate it to your existing trans with an adapter from Advance Adapters -Run the 455 and trans, but change out rear tailshafts and housings with a 4x4 TH400 tailshaft and housing. Motor mounts not sure on, prolly not that big of a deal. __________________ [COLOR="Lime"][B]1999 Chevy K3500, 5.7/4L80E/14FF/stock/stock/stock[/B][/COLOR] Last edited by GMCTruxrule; 11-20-2007 at 03:34 PM.

11-21-2007, 10:38 AM	#7 (permalink)
GMCTruxrule Registered User Join Date: Aug 2005 Member # 51243 Location: Tropical Paradise Posts: 3,410	There are some things that are worth the time and money doing, but trying to figure out a way to throw some shit together is tough. I would highly recommend going with a rebuilt 350 to replace your 305. Its a direct bolt in replacement. The 455 Buick is a torque monster for sure, and i would get the adapter from Advance adapters and run the existing trans that you have. If you really want to run the Buick motor. __________________ [COLOR="Lime"][B]1999 Chevy K3500, 5.7/4L80E/14FF/stock/stock/stock[/B][/COLOR]

11-22-2007, 05:45 PM	#8 (permalink)
the_experience3006 Registered User Join Date: Sep 2006 Member # 80052 Location: St. James, MN Posts: 1,703	$57.99 from Jegs __________________ [QUOTE=abig84;9192789]i swear id be gay if it wasn't for all the gay sex that's involved[/QUOTE] [QUOTE=TexasBlake;10305687]She's not that hot. I was just looking for a quick lay and she all wanted to like go on dates and shit. [/QUOTE] Last edited by the_experience3006; 11-22-2007 at 05:46 PM.

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11-20-2007, 04:19 PM	#3 (permalink)
fredbuilt Registered User Join Date: Oct 2007 Member # 100979 Location: Boothbay Harbor Maine Posts: 37	I am not 100% sure but I was always told the 0lds 455, buick 455, and the chevy 454 were pretty much identical. I have a 454/th400 in my truck so if there is anything you wanna compare notes on tell me.

11-20-2007, 08:42 PM	#6 (permalink)
79chevy39.5's Registered User Join Date: Feb 2006 Member # 67935 Location: kennewick WA Posts: 1,025	i would take what you got and find the olds 350 diesel motor mounts and then you got a drop in as far as motor mounts then youll want the bop t-400 with 4x4 tail shaft for the strenth and simplicity then just pop in a 205 because the 203 chains dont like abuse very much