Small Block to Big block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HDBOB · 02-24-2011, 10:20 AM

I am replacing my tired 350 in my 72 GMC with a correct 402 and t400 trans from a 72 cheyenne. I have the correct a/c brackets and alt, pwr st pump and reservoir. Can anyone tell me what else I will need to change ? Motor mounts ? Radiator/and or shroud?

dan42 · 02-24-2011, 11:43 AM

Lots of guys have done this - I would look through the build threads.

**Classic Heartbeat** · 02-24-2011, 01:06 PM

You will need the engine frame mounts and motor mounts too. Wouldn't hurt to grab the 4 row radiator and all of it's parts. WES

**leddzepp** · 02-24-2011, 01:14 PM

You will also need a different yoke if you are changing from a TH350 to a TH400.

Texasbigblock · 02-24-2011, 06:40 PM

fan shroud also

02-24-2011, 10:20 AM	#1
HDBOB Registered User Join Date: Jan 2011 Location: laconia NH Posts: 196	Small Block to Big block I am replacing my tired 350 in my 72 GMC with a correct 402 and t400 trans from a 72 cheyenne. I have the correct a/c brackets and alt, pwr st pump and reservoir. Can anyone tell me what else I will need to change ? Motor mounts ? Radiator/and or shroud?

02-24-2011, 11:43 AM	#2
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Small Block to Big block Lots of guys have done this - I would look through the build threads. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

02-24-2011, 01:06 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Small Block to Big block You will need the engine frame mounts and motor mounts too. Wouldn't hurt to grab the 4 row radiator and all of it's parts. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

02-24-2011, 01:14 PM	#4
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,996	Re: Small Block to Big block You will also need a different yoke if you are changing from a TH350 to a TH400. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

02-24-2011, 06:40 PM	#5
Texasbigblock Registered User Join Date: Mar 2007 Location: Texas Posts: 252	Re: Small Block to Big block fan shroud also __________________ -Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia"



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