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#1 |
Registered User
Join Date: Aug 2006
Location: katy texas
Posts: 48
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How Good is Turbo 350?
My 1970 truck had a 350ci w/ th350 , i'm putting a new 454 instead. Do you think a th350 will hold up? Here's what's in my motor
454 from chevy 1 ton 9 to 1 compression balanced lower end crane roller rockers new bigger pushrods and guides new valves comp cams with .504in lift .510ex lift performer 2 intake 750 performer carb new hei distributor w/50k coil msd 6al msd 8.5 mm wires holley mech fuel pump 110 gph any guesses what this could be putting out? I've been told about 425hp but i don't really know anything except it's pretty fast in the 1 ton when you ain't shifting that granny 4spd. I have a good th400 is it worth the trouble to make it fit?
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1970 custom/10 (was 8-350) long bed factory a/c,power steering, power brakes added front disc brakes from a 72 and rear axles 5 lug 79 chev 1 ton 01 GMC Jimmy Last edited by Roachgod; 08-06-2006 at 10:14 PM. |
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#2 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: How Good is Turbo 350?
Used or stock = not very long, properly rebuilt with HD components = pretty good, best = TH400 properly built.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#3 |
Registered User
![]() Join Date: Feb 2004
Location: brownfield texas (west texas)
Posts: 1,936
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Re: How Good is Turbo 350?
put a 127.00 dollar bm kit in it and throw what ever you want at it. get them at jegs or summit
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The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS |
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#4 |
Registered User
Join Date: Aug 2006
Location: katy texas
Posts: 48
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Re: How Good is Turbo 350?
The th350 is used and i'm pretty sure it's stock. I have a th400 that I know was running 1 1/2 years ago and has been stored inside my home. I was scared to change too much on this poor old truck at once. I'm sorry for buggin everyone all at once but I just found this forum and it's a goldmine of info. I thought the hard part was buying that big pretty motor, but it seems that may have been the easy part. I should have known better. I guess they say good things come to those who wait.
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1970 custom/10 (was 8-350) long bed factory a/c,power steering, power brakes added front disc brakes from a 72 and rear axles 5 lug 79 chev 1 ton 01 GMC Jimmy |
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#5 |
I survived Dead Man's Curve.
Join Date: Apr 2006
Location: The Nine-Five-687
Posts: 389
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Re: How Good is Turbo 350?
In the past, I had noticed that big blocks usually came with a 400 instead fo the 350, like it's built to withstand the abuse from a big block. And I'm sure it would handle it pretty well as long as you don't floor it too much
![]() IF you want to floor it, a lot, then TH400 is the way to go.
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"The people should not be afraid of their government. The government should be afraid of it's people." "The Hurricane" 1967 Chevrolet C10 350 Eight Cylinder, 700R4 BowtieOverdrive Cherry Bomb... Disturbing the Peace Since 1968. ![]() |
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#6 |
Registered User
Join Date: Aug 2005
Location: kentucky
Posts: 211
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Re: How Good is Turbo 350?
i have a turbo 350 behind my 454 with no problems at all, id say im putting out 370 h.p and i have a stock 350 turbo, with a small shift kit ands it s held up to my abuse well
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#7 |
Registered User
Join Date: Oct 2003
Location: Central Vermont
Posts: 8,538
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Re: How Good is Turbo 350?
I had a built th-350 behing a 396 that did great in my K20.
Did a fair amount of towing with it too. Gotta build the th-350 though. |
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#8 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,269
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Re: How Good is Turbo 350?
Turbo 350 is an excellent transmission but the 400 is even better for high torque. Why not just use the turbo350 for now and if it goes kaka, get the 400 ready to go in. This way you don't invest in the 350 unless you need to and have a plan B!! Guess I'm cheap but I would much rather put money into an overdrive transmission before I put it into either 3speed.
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#9 |
Registered User
![]() Join Date: Feb 2004
Location: brownfield texas (west texas)
Posts: 1,936
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Re: How Good is Turbo 350?
well it all depends what you want stock yea the 400 is stouter. but i like to go fast, the 350 is lighter, and mildly but will handle the abuse. not to mention there is less rpm drop during shift changes witch means faster down the track and oh another thing you can put a 350 in any gear and keep it there where as the 400 is known for jumping up to the next gear. just some thoughts. the only problem i had with a 350 was in a chevy luv. the motor did not have solid mounts to keep if from twisting i was running a sb chevy 399 stroker with a 200 shot. it ran about a 10---- . when i plugged 2nd one time the motor twisted and shattered the out side of the tranny. all i have ever run was 350's with that cheap old 127.0 kit an im talking a th350 out of the bone yard as long as the pump is good thats all im relly concerned about. i throw 600 hp at them all the time
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The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS |
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#10 |
Registered User
![]() Join Date: Feb 2004
Location: brownfield texas (west texas)
Posts: 1,936
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Re: How Good is Turbo 350?
well it all depends what you want stock yea the 400 is stouter. but i like to go fast, the 350 is lighter, and mildly but will handle the abuse. not to mention there is less rpm drop during shift changes witch means faster down the track and oh another thing you can put a 350 in any gear and keep it there where as the 400 is known for jumping up to the next gear. just some thoughts. the only problem i had with a 350 was in a chevy luv. the motor did not have solid mounts to keep if from twisting i was running a sb chevy 399 stroker with a 200 shot. it ran about a 10---- . when i plugged 2nd one time the motor twisted and shattered the out side of the tranny. all i have ever run was 350's with that cheap old 127.0 kit an im talking a th350 out of the bone yard as long as the pump is good thats all im relly concerned about. i throw 600 hp at them all the time
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The Ghost 67 short wide full custom. 550 hp LSX, 4l80E, narrowed 9". Body dropped w/air ride! ........................ ___ .........________//__{\_____ ,,,,,,,/__(⊙)___//___/__(O)_/ @disciple2.rc 💪instagram💪 LED TAILS |
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#11 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,140
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Re: How Good is Turbo 350?
I have a 350 behind my 454 with about the same specs as yours. Its holding up fine so far.
Off topic - When you get that BB running I'd like to know what you think of the cam
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#12 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: How Good is Turbo 350?
I believe a TH350 can take anything a TH400 can.That`s been my experience.They need to be set-up for whatcu got and how you use it.I had one built for my`71 Blazer by a guy that was recommended by Dave Coleman,a leading race motor builder.Well,it lasted about 1,000 miles behind my 400 hp 350.Then,a guy that "REALLY" knew his stuff built it.His guy had it torn down,looking at roached clutches in 15 minutes while he talked to me.The trans was set-up for a 1/4 mile Camaro,not a 5,000# mud truck with 4 wheel posi and 37" SuperSwampers.He said he won`t build a trans w/o replacing the torque converter,most bad transmissions are caused by the tq-conv.There is no way to tell a good one from a bad one looking at it.I prefer the higher first to second shift-point of the TH350 and only use a TH400 for heavy duty applications.I`d rather use either 3spd and a GearVendors o/d than any o/d automatic.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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