how much hp, can th350 handle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

matt_field · 08-14-2005, 11:48 AM

im having a 396 bb built up for my 72 shortbox, i want to install a th400 but not looking forward to getting a different yoke and gettting the shaft cut..... should i just stay with a th350? or is it worth the work to a th400? thanks!

cdowns · 08-14-2005, 12:05 PM

turbo350's can be built to take over 800hp

*Randy70C-10* · 08-14-2005, 12:11 PM

I had one built for my Model A running a 6:71 blown 350 (ported heads and all that other crap)...680 horses.

Burnsman · 08-14-2005, 12:40 PM

Ran 9.12 on one in a 73 camaro.

GMC AMI · 08-14-2005, 02:06 PM

They are a lot tougher than given credit for!

chevymad · 08-14-2005, 02:18 PM

My friend ran one in a lifted 77 4x4.. big tires, 500hp 454.. tranny outlasted the truck.

Purs · 08-14-2005, 02:30 PM

are you rebuilding the TH350? It's doubtful any of the one's mentioned are anywhere near stock. They can undoubtably be built ($$) to withstand alot of punishment. It also depends on how bad your going to treat it(just street tires or track/slicks...). For peace of mind I went ahead and swapped in a TH400, because I didn't want to be swapping transmissions frequently. Most likely, if you're talking about a cruiser/ street tire smoker, the 350 will be fine.

junkyardjohn · 08-14-2005, 03:52 PM

GENERAL MOTORS NEVER PUT A T-350 BEHIND A BIG BLOCK. JOHN

ratrod67 · 08-14-2005, 05:34 PM

I have a T350 in this. 612hp, 738ft tq. Definately not stock but not too bad. $250 in the rebuild and $400 in the converter. Has a manual valve body, shift improvements, ect.

Purs · 08-14-2005, 05:47 PM

Quote:

Originally Posted by ratrod67

I have a T350 in this. 612hp, 738ft tq. Definately not stock but not too bad. $250 in the rebuild and $400 in the converter. Has a manual valve body, shift improvements, ect.

very nice.

86swb · 08-14-2005, 09:17 PM

ratrod67, Bad ass car you have there. Nice. Love the yellow with the black strips.

*Randy70C-10* · 08-14-2005, 11:38 PM

Quote:

Originally Posted by junkyardjohn

GENERAL MOTORS NEVER PUT A T-350 BEHIND A BIG BLOCK. JOHN

They never put one in a Model A Ford Either.

GMC AMI · 08-15-2005, 06:56 AM

Originally Posted by junkyardjohn
GENERAL MOTORS NEVER PUT A T-350 BEHIND A BIG BLOCK. JOHN

They never put one in a Model A Ford Either.

GM also put the best truck motor in a car!

camaro__thunder · 08-15-2005, 02:43 PM

Make sure you get the heat treated sprag and drum no matter what.. The sprag is the weakest link in the Turbo trans. You also get to keep a little more power with the 350 over the 400. Go with the TH350

GMC AMI · 08-15-2005, 02:58 PM

Keep the 350 unless it acts up and then worry about an upgrade. I ran a stock one in a Buick Stage 1 455 with a slight cam with only a B+M shift upgrade kit and it lasted thru 2 drag seasons with 0 problems! I sold the car

and it still snapped your head off on the shift points! Not too hard to change a tranny on a 2 wd.

Orence1 · 08-15-2005, 09:22 PM

Matt,
I am running a TH-350 on a 72 LWB with a 450hp 402. I spent about $450 on a rebuild and I don't anticipate any problems at all. BTW, I think you will need to have the drive shaft shortened as a result of the BB. You will want to mount it in the forward set of frame holes to allow maximum firewall clearance for the distributor. Good luck. You will love the performance.
Larry

86swb · 08-15-2005, 09:29 PM

Quote:

Originally Posted by Orence1

I spent about $450 on a rebuild and I don't anticipate any problems at all. Larry

$450.00? Surely you did all the work yourself.

08-14-2005, 11:48 AM	#1
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	how much hp, can th350 handle? im having a 396 bb built up for my 72 shortbox, i want to install a th400 but not looking forward to getting a different yoke and gettting the shaft cut..... should i just stay with a th350? or is it worth the work to a th400? thanks! __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

08-14-2005, 12:05 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	turbo350's can be built to take over 800hp __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-14-2005, 12:40 PM	#4
Burnsman Chevy Freak Join Date: Sep 2002 Location: Meadville, Pa. Posts: 2,804	th350 Ran 9.12 on one in a 73 camaro. __________________ 69 GMC SWB, 350 70 Chevy LWB, 350 55 chevy gasser, 461 73 Camaro, 496 67 RS Camaro, 406 64 Chevelle, 588 71 Nova, 565 67 Camaro, 461

08-14-2005, 02:06 PM	#5
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	They are a lot tougher than given credit for! __________________ 1968 Chevy 4x4 307 4 speed

08-14-2005, 02:30 PM	#7
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	are you rebuilding the TH350? It's doubtful any of the one's mentioned are anywhere near stock. They can undoubtably be built ($$) to withstand alot of punishment. It also depends on how bad your going to treat it(just street tires or track/slicks...). For peace of mind I went ahead and swapped in a TH400, because I didn't want to be swapping transmissions frequently. Most likely, if you're talking about a cruiser/ street tire smoker, the 350 will be fine. __________________ "Experience is what you get when you didn't get what you wanted." Last edited by Purs; 08-14-2005 at 02:31 PM.

08-14-2005, 12:11 PM	#3
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	I had one built for my Model A running a 6:71 blown 350 (ported heads and all that other crap)...680 horses.

08-14-2005, 02:18 PM	#6
chevymad Registered User Join Date: Jan 2001 Location: skamokawa, WA, USA Posts: 527	My friend ran one in a lifted 77 4x4.. big tires, 500hp 454.. tranny outlasted the truck.

08-14-2005, 03:52 PM	#8
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	GENERAL MOTORS NEVER PUT A T-350 BEHIND A BIG BLOCK. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

08-14-2005, 05:34 PM	#9
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	I have a T350 in this. 612hp, 738ft tq. Definately not stock but not too bad. $250 in the rebuild and $400 in the converter. Has a manual valve body, shift improvements, ect. Attached Images

08-14-2005, 09:17 PM	#11
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	ratrod67, Bad ass car you have there. Nice. Love the yellow with the black strips. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

08-15-2005, 06:56 AM	#13
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	Originally Posted by junkyardjohn GENERAL MOTORS NEVER PUT A T-350 BEHIND A BIG BLOCK. JOHN They never put one in a Model A Ford Either. GM also put the best truck motor in a car! __________________ 1968 Chevy 4x4 307 4 speed

08-15-2005, 02:43 PM	#14
camaro__thunder Epoxy Primer Friendly Join Date: Feb 2004 Location: South of Houston TEXXXAS Posts: 680	Th___ Make sure you get the heat treated sprag and drum no matter what.. The sprag is the weakest link in the Turbo trans. You also get to keep a little more power with the 350 over the 400. Go with the TH350 __________________ My Project 69 SWB SHAVED BAGGED DOORED

08-15-2005, 02:58 PM	#15
GMC AMI Registered User Join Date: Apr 2004 Location: The Other Maine! Posts: 2,236	Run it! Keep the 350 unless it acts up and then worry about an upgrade. I ran a stock one in a Buick Stage 1 455 with a slight cam with only a B+M shift upgrade kit and it lasted thru 2 drag seasons with 0 problems! I sold the car and it still snapped your head off on the shift points! Not too hard to change a tranny on a 2 wd. __________________ 1968 Chevy 4x4 307 4 speed

08-15-2005, 09:22 PM	#16
Orence1 Registered User Join Date: Jan 2000 Location: Bothell, WA Posts: 548	Matt, I am running a TH-350 on a 72 LWB with a 450hp 402. I spent about $450 on a rebuild and I don't anticipate any problems at all. BTW, I think you will need to have the drive shaft shortened as a result of the BB. You will want to mount it in the forward set of frame holes to allow maximum firewall clearance for the distributor. Good luck. You will love the performance. Larry



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