454to a TH350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dgodecke · 03-21-2010, 11:14 PM

Okay the truck had a 427 in it but it was a junk motor constructed from several motors and it was frozen up, the heads didn't even match each other. A guy wanted the block regardless and swapped me a 454 for the 427. The 454 is built up and dynoed at 450HP.

The question is what do I need to do to the TH350 to help it hold the 454?

I would love to change it out to a 400 but I have the NP205 transfer case and every TH400 with a transfer case I have seen looks like it has the front shaft on the left side while my 73 has the front shaft on the right side.

What is the best way to go?

KungPowMinchow · 03-21-2010, 11:55 PM

i have an L88 427 in my truck and i went through two th350 and one th400 before i called tci and had them build me a th400 and so far its held up only had it in for a year now.

dgodecke · 03-22-2010, 07:31 PM

Quote:

Originally Posted by KungPowMinchow

i have an L88 427 in my truck and i went through two th350 and one th400 before i called tci and had them build me a th400 and so far its held up only had it in for a year now.

I talked with my Trans guy today also. He said he could do a TH400 for me but the 350 would not handle my kind of HP. Looking at $1600 and that includes the Advance Adapter kit to mate my NP205 to a TH400.

LiveAnimals · 03-23-2010, 09:51 AM

I'm running a TH350 in my 73 behind a 454 it does the job, but I also will be changing it to a TH400 for the added strength,

03-21-2010, 11:14 PM	#1
dgodecke Registered User Join Date: Feb 2010 Location: Poulsbo, wa Posts: 42	454to a TH350 Okay the truck had a 427 in it but it was a junk motor constructed from several motors and it was frozen up, the heads didn't even match each other. A guy wanted the block regardless and swapped me a 454 for the 427. The 454 is built up and dynoed at 450HP. The question is what do I need to do to the TH350 to help it hold the 454? I would love to change it out to a 400 but I have the NP205 transfer case and every TH400 with a transfer case I have seen looks like it has the front shaft on the left side while my 73 has the front shaft on the right side. What is the best way to go? __________________ 07 Chev 2500HD Classic Project Ranch Hand, Hauling A$$ since 1973 I was told this Project had a L-72 427 425HP, It did not. It does have a 427 block and parts from various 427 motors. It will end up with a nice strong 454 in the end. It has not been run for 20+ years Frame up restoration started2/15/2010

03-21-2010, 11:55 PM	#2
KungPowMinchow Registered User Join Date: Mar 2010 Location: Casper Wyoming Posts: 46	Re: 454to a TH350 i have an L88 427 in my truck and i went through two th350 and one th400 before i called tci and had them build me a th400 and so far its held up only had it in for a year now.

03-23-2010, 09:51 AM	#4
LiveAnimals Registered User Join Date: Dec 2008 Location: Antelope, CA Posts: 681	Re: 454to a TH350 I'm running a TH350 in my 73 behind a 454 it does the job, but I also will be changing it to a TH400 for the added strength, __________________ Kameron YESTERDAY IS HISTORY - TOMORROW IS A MYSTERY I'm a Middle ClASS HOLE 07.5 Dodge 3500 CTD -- Daily 73 C10 Factory BB SWB 2WD



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