454 engine with a TH350 trans ok? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

scf100 · 02-19-2020, 10:15 PM

454 stroked to a 496 alum heads roller rockers 10.1 compression

Will a TH350 trans be ok with it?

That’s what came with my truck

Not hooked up yet so not running

**Steeveedee** · 02-19-2020, 11:04 PM

If you're Gordon "Lightfoot", you'll be OK. If you're towing or going to do some burnouts, that trans is going to burn out.

**Speedracer39** · 02-19-2020, 11:38 PM

I would suggest looking for a turbo 400

KQQL IT · 02-19-2020, 11:44 PM

I have a 700r4 behind a 454 it's doing fine, 3 years so far. A 350 would live if you drive civilized.

**truckster** · 02-19-2020, 11:48 PM

Quote:

Originally Posted by KQQL IT

I have a 700r4 behind a 454 it's doing fine, 3 years so far.
Drive civilized.

496 CID, 10:1 compression. I'll wager he's not planning on driving civilized.

BlouDon · 02-20-2020, 03:28 AM

Quote:

Originally Posted by KQQL IT

I have a 700r4 behind a 454 it's doing fine, 3 years so far. A 350 would live if you drive civilized.

THAT must be DELICIOUS!!

There must be many transmission companies (like Monster Transmissions) that can upgrade any transmission to the N-th degree...

**biketopia** · 02-20-2020, 08:16 AM

Monster is a garbage company,I would suggest never getting a transmission from them. But OP, a TH350 can absolutely live behind that engine they are routinely built to hold 1000hp, would a TH400 be "better" maybe, but you already have the 350, you'll be fine with it. I'd suggest finding a local builder to go through it and reaching out to one of more reputable converter companies and see about upgrading your converter.

**tdangle** · 02-20-2020, 12:05 PM

From what I've read, stock they handle up to about 400 lb/ft and properly built easily handle 600 lb/ft. I believe torque is the killer not HP.

**biketopia** · 02-20-2020, 12:19 PM

Quote:

Originally Posted by tdangle

From what I've read, stock they handle up to about 400 lb/ft and properly built easily handle 600 lb/ft. I believe torque is the killer not HP.

true, and in a 2wd blazer traction is going to be your big killer overall. A competent builder shouldn't have problem getting a th350 to hold the power and torque though.

Heavymetl · 02-20-2020, 12:32 PM

Stock the TH350 isn't really that impressive. They shift like most bone stock 60s automatics....sllloooowwwwlly. lol

But any good builder can make them awesome.

**HO455** · 02-20-2020, 01:12 PM

We have a th350 behind a 455 Pontiac that has pulled 440hp on a chassis dyno a half dozen times over the years and runs 11.20's at 122 mph on 255/60/15 Les Schwabs. No problems since installed 15k miles ago.
Our tranny guy said we would have to have a good case to start with and that not all cases were machined to tolerance when they were new. We ended up giving him 3 cores before he found one he liked.

68Gold/white · 02-20-2020, 01:12 PM

A TH350 will be OK, not for all out, sticky tire performance driving, though...unless properly built...

A TH350 CAN be properly built to handle the power!!!

FYI, the Farm truck ran a TH350 for several years. I've seen the farm truck run 10's, AND it likely weighs 4500-plus pounds.

Here several years back, right before the "outlaws" became movie stars...I was at Noble, Oklahoma, at Thunder Valley, watching the street racing program the have/had. Farm Truck was there, along with some of the others...I asked the owner what trans he was using, he said a TH400. THis night of racing was one of the first with the TH400 trans. He told me he had run the TH350 for years. It did give up on him several years before, simply because it was a near stock trans. He had it properly built, had zero issues after that....He said he switched to the TH400, just for peace of mind....

**biketopia** · 02-20-2020, 01:53 PM

Which ever way you go, get a converter matched to your combo, call up FTI, ATI, Huges, Yank, etc...not B&M and get a quiality converter spec'd around your combo and usage. It will make the whole combo work together, and the nice thing about Turbo transmissions, you can swap a converter from a th350 to th400 no problem, (unless you have a lock up 350 version)

fdbdw · 02-20-2020, 02:33 PM

I had the same decision to make just a few days ago. I decided to pull the 350 and go with the 400 . I don’t have the discipline to keep my foot out of it and didn’t want to worry about it. Plus I figured I can recoup some money by selling a good Th350 vs waiting till it nuked and is worthless.

scf100 · 02-20-2020, 04:04 PM

good stuff fellas thanks....

will make sure the 350 gets beefed up.....I like to use my right foot.....a lot....

**biketopia** · 02-20-2020, 05:02 PM

I have one behind my 550hp 427sbc in my camaro and beat on it constantly with a 5k converter, it holds great.

02-19-2020, 10:15 PM	#1
scf100 Registered User Join Date: Feb 2015 Location: Athens,Ga Posts: 216	454 engine with a TH350 trans ok? 454 stroked to a 496 alum heads roller rockers 10.1 compression Will a TH350 trans be ok with it? That’s what came with my truck Not hooked up yet so not running __________________ 1970 2WD Blazer 454 1972 C-10 Extended Cab 350 SBC

02-19-2020, 11:04 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,110	Re: 454 engine with a TH350 trans ok? If you're Gordon "Lightfoot", you'll be OK. If you're towing or going to do some burnouts, that trans is going to burn out. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

02-19-2020, 11:38 PM	#3
Speedracer39 Senior Member Join Date: Sep 2016 Location: Omaha Nebraska Posts: 591	Re: 454 engine with a TH350 trans ok? I would suggest looking for a turbo 400

02-19-2020, 11:44 PM	#4
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,138	Re: 454 engine with a TH350 trans ok? I have a 700r4 behind a 454 it's doing fine, 3 years so far. A 350 would live if you drive civilized. __________________ " That didnt make it any newer " " Dont antique the equipment "

02-20-2020, 08:16 AM	#7
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,009	Re: 454 engine with a TH350 trans ok? Monster is a garbage company,I would suggest never getting a transmission from them. But OP, a TH350 can absolutely live behind that engine they are routinely built to hold 1000hp, would a TH400 be "better" maybe, but you already have the 350, you'll be fine with it. I'd suggest finding a local builder to go through it and reaching out to one of more reputable converter companies and see about upgrading your converter. __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350

02-20-2020, 12:05 PM	#8
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,209	Re: 454 engine with a TH350 trans ok? From what I've read, stock they handle up to about 400 lb/ft and properly built easily handle 600 lb/ft. I believe torque is the killer not HP. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

02-20-2020, 12:32 PM	#10
Heavymetl Registered User Join Date: Feb 2012 Location: Southern Ohio Posts: 292	Re: 454 engine with a TH350 trans ok? Stock the TH350 isn't really that impressive. They shift like most bone stock 60s automatics....sllloooowwwwlly. lol But any good builder can make them awesome. __________________ 1970 C10 Turbo LM7 5.3/LS6 cam PT7675/4L80E/Holley Dominator EFI/E85 Moser 9" 3.25/4 wheel discs 11.16@121.07

02-20-2020, 01:12 PM	#11
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,838	Re: 454 engine with a TH350 trans ok? We have a th350 behind a 455 Pontiac that has pulled 440hp on a chassis dyno a half dozen times over the years and runs 11.20's at 122 mph on 255/60/15 Les Schwabs. No problems since installed 15k miles ago. Our tranny guy said we would have to have a good case to start with and that not all cases were machined to tolerance when they were new. We ended up giving him 3 cores before he found one he liked. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

02-20-2020, 01:12 PM	#12
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,285	Re: 454 engine with a TH350 trans ok? A TH350 will be OK, not for all out, sticky tire performance driving, though...unless properly built... A TH350 CAN be properly built to handle the power!!! FYI, the Farm truck ran a TH350 for several years. I've seen the farm truck run 10's, AND it likely weighs 4500-plus pounds. Here several years back, right before the "outlaws" became movie stars...I was at Noble, Oklahoma, at Thunder Valley, watching the street racing program the have/had. Farm Truck was there, along with some of the others...I asked the owner what trans he was using, he said a TH400. THis night of racing was one of the first with the TH400 trans. He told me he had run the TH350 for years. It did give up on him several years before, simply because it was a near stock trans. He had it properly built, had zero issues after that....He said he switched to the TH400, just for peace of mind....

02-20-2020, 01:53 PM	#13
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,009	Re: 454 engine with a TH350 trans ok? Which ever way you go, get a converter matched to your combo, call up FTI, ATI, Huges, Yank, etc...not B&M and get a quiality converter spec'd around your combo and usage. It will make the whole combo work together, and the nice thing about Turbo transmissions, you can swap a converter from a th350 to th400 no problem, (unless you have a lock up 350 version) __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350

02-20-2020, 02:33 PM	#14
fdbdw Registered User Join Date: Jan 2009 Location: colorado springs Posts: 479	Re: 454 engine with a TH350 trans ok? I had the same decision to make just a few days ago. I decided to pull the 350 and go with the 400 . I don’t have the discipline to keep my foot out of it and didn’t want to worry about it. Plus I figured I can recoup some money by selling a good Th350 vs waiting till it nuked and is worthless.

02-20-2020, 04:04 PM	#15
scf100 Registered User Join Date: Feb 2015 Location: Athens,Ga Posts: 216	Re: 454 engine with a TH350 trans ok? good stuff fellas thanks.... will make sure the 350 gets beefed up.....I like to use my right foot.....a lot.... __________________ 1970 2WD Blazer 454 1972 C-10 Extended Cab 350 SBC

02-20-2020, 05:02 PM	#16
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,009	Re: 454 engine with a TH350 trans ok? I have one behind my 550hp 427sbc in my camaro and beat on it constantly with a 5k converter, it holds great. __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350



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