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#1 |
Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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TH350 or TH400??
Say you had a 72 GMC with a 350 engine that was an occasional daily driver. If you had the opportunity to put either a TH350 or a TH400 in your truck which one would you choose and why?
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-Scott- Last edited by sjarrett71; 02-24-2011 at 08:20 PM. |
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#2 |
Registered User
Join Date: Feb 2010
Location: Moyie Springs ID.
Posts: 160
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Re: TH350 or TH400??
th400 there stronger and dont have a kickdown cable but the th350 is just fine just my thoughts
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#3 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
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Re: TH350 or TH400??
It all depends on what I had before either 1 and you would/might have to alter driveshaft rear trans. mount.The 400 is tuff when built right has an electric kickdown versus the cable for the 350.I have ran 350 that I built myself and they are strong and plenty around.So if I'm not pushing a bunch of HP I would get a 350
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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#4 |
Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: TH350 or TH400??
Definately not a bunch of horsepower. Just have both available and wondering which one I should install. I will keep the other as a backup.
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-Scott- |
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#5 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,864
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Re: TH350 or TH400??
A Turbo 400 takes around (if I recall correctly) 35 more horses to run. So it does rob your engine some over a turbo 350.
Livrat has a big block in his 4x4 and he runs the heck outta that thing. Lots of towing etc etc and he told me his turbo 350 has held up just fine for thousands of miles.
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… … … … … … … … ... … … … … … … … … … … … Last edited by CG; 02-24-2011 at 10:06 PM. |
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#6 |
Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: TH350 or TH400??
I've heard that about the 400 also but don't know how factual it is. I know people have them behind 350's and do fine with them. I guess that's why I asked, to get peoples experiences and suggestions.
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-Scott- |
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#7 |
Registered User
Join Date: May 2003
Location: Deer Park, WA
Posts: 30
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Re: TH350 or TH400??
Unless you have a monster engine or do a lot of towing a 400 is only going to rob power.
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#8 |
Registered User
Join Date: Feb 2010
Location: Moyie Springs ID.
Posts: 160
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Re: TH350 or TH400??
Ya the 400 does rob more power but i read in chevy high performance that u will actually run better times with the 400.
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#9 |
Registered User
Join Date: Dec 2007
Location: Nanaimo B.C.
Posts: 604
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Re: TH350 or TH400??
that may have to do with the gearing
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I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! |
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#10 | |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
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Re: TH350 or TH400??
Quote:
Last edited by Livrat; 02-25-2011 at 12:47 AM. |
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#11 |
Hand Crafted C-10
![]() Join Date: Aug 2006
Location: Burien, WA
Posts: 5,180
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Re: TH350 or TH400??
They are both great trannys. T400s are very durable.
But, T350s are good too and can probably be upgraded cheaper. (not sure about that, maybe someone can chime in.) If you aren't working your truck a bunch, a stock T350 (easy to find, upgrade, rebuild, etc) should be fine and then some. I have a T400 behind my 327 street truck and it's fine also. It's what I have. I would choose depending what driveshaft/yoke you have available. Keep the other and keep it's yoke if you have to change it in the future. Another thought~ Though I'm a T400 enthusiast, I would think T350 is probably stock for your truck. OK ~ that's my 12 cents. ![]() Last edited by ETsC10; 02-25-2011 at 01:10 AM. |
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#12 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: TH350 or TH400??
i'd go with an overdrive tranny anytime i'd need to make a choice
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#13 |
Registered User
Join Date: May 2000
Location: Alexandria, LA 71301
Posts: 1,451
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Re: TH350 or TH400??
i agree with ccdowns all around as far as driveability and mileage gains, although for an occasional driver i'd opt for the 350 as far as low cost to build, maintain, perform and drive and there are so many options to make it a fun to drive transmission no matter what your needs are. the 400 is more bullet-proof in stock form and is only marginally more expensive than a 350 not considering the power loss versus the 350.
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#14 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,151
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Re: TH350 or TH400??
Forced to choose between the 2, I would probably go with a TH400 just because it is more bulletproof. If I went with a TH350 it would be stone stock-no shift kit, no hi stall converter, and no lockup version. The TH350 is a good transmission but when it goes it can splatter. The "built" ones seem worse IMHO than the stock ones. The lockup version has issues with pumps that you don't need.
Honestly, if you are going to swap, I'd go to a 700R4 and get overdrive.
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#15 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: TH350 or TH400??
I'd go th350 lower 1st gear woud make it more fun and be able to handle a highway gear better. I like to peel out so the lower gear and less power loss plays a big role in my decision. Dont tell the cops!
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#16 |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: TH350 or TH400??
lower first gear??
2.42 is 2.42 with the choice and only a 350cid I'd go th350 why.. you can get a 200r4 and build it, and it bolts into the spot the th350 was.. |
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#17 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: TH350 or TH400??
I've heard the th350 has a lower 1st gear than the th400. I'm no trans guru.
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#18 |
Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: TH350 or TH400??
I might go with an overdrive tranny but I don't have one. I only have the 350 and 400 tranny's.
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#19 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: TH350 or TH400??
most th350 have 252 first gear th400 have 248 first gear not much of a difference that you'd feel in the seat of the pants between the two
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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 |
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#20 |
Account Suspended
Join Date: Sep 2010
Location: hingham ma
Posts: 1,721
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Re: TH350 or TH400??
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#21 |
Registered User
Join Date: Jun 2010
Location: Jefferson, MD
Posts: 2,397
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Re: TH350 or TH400??
I'd go with the 350 if it's just a standard DD. Plus, if you ever get tired of it, it's practically nothing to swap in a 2004r.
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#22 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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Re: TH350 or TH400??
I vote the TH350 because they are reliable and easier and cheaper to repair. Especially behind a stock sm block. Under normal driving conditions without constant abuse it should give you decent service. Even a reliable transmision shop echo'd this comment to me.
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#23 |
Registered User
Join Date: Oct 2007
Location: Valley Springs, Ca
Posts: 857
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Re: TH350 or TH400??
I never have had a TH400 in any of these trucks. My truck I have started to do a ground up on with my 383 stroker motor pushing around 500HP does pretty well with a TH350 and pulling me 0-60 MPH in just around 5 seconds I think thats doing pretty damn well. and never had a problem with it one bit. I also debated on changing but I seem to not have any problems so why should I change and then have to change other parts to get it to work.
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#24 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: TH350 or TH400??
400 T....you wont break it or wear it out. Under normal use, I have seen them run a 1/4 MILLION miles. I takes about 20 more ponies to pull it vs the 350 T....but after 250000 miles , who gives a chit? crazyL
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#25 |
Double 6's
Join Date: Oct 2008
Location: Winter Haven, FL
Posts: 349
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Re: TH350 or TH400??
I happen to be in the middle of this kinda swap, I have a th350, rebuilt, with a shift kit, and a 2100 stall torque converter that was meant for another project, but is going in my 66 with a stock 327....hope it all goes well for both of us!
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