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08-20-2009, 04:44 PM | #1 |
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Join Date: Oct 2005
Location: Rapid City South Dakota
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Turbo 400 - Good, Bad, and Ugly
Is there a good, better, or best turbo 400 transmission for our trucks? Are there certain years with a better case? Should we be using a short 4", or a long 9" shaft transmission? Are there any benefits to one over the other? Can anyone recommend an upgrade kit for a junkyard transmission? Thanks.
69swb 2wd mods to hook, including migrating weight to back end 650-950 hp at crank without and with NO2 some weight reduction |
08-20-2009, 05:06 PM | #2 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
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Re: Turbo 400 - Good, Bad, and Ugly
I think the the long tailshafts are TH375s with the same spline count as a
TH350. go with the short. most have a bolt on yoke |
08-21-2009, 12:04 AM | #3 |
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Join Date: Jul 2008
Location: Olive Branch,Mississippi
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Re: Turbo 400 - Good, Bad, and Ugly
Its most in the tranny man,learn to build one its fun and its something you will never forget!Best of luck.I have long tails
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08-30-2009, 03:04 PM | #4 |
At the body shop.
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Re: Turbo 400 - Good, Bad, and Ugly
You can also look for one out of a motorhome better case straight cut planetarys(SP) will accept short tail shaft with a slipyoke
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08-30-2009, 10:04 PM | #5 |
Mean Green
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Location: Portland, OR
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Re: Turbo 400 - Good, Bad, and Ugly
650-950 hp at crank. That's a wide range.
Where are these numbers coming from? A junk yard rebuild is not going to handle this type of power for very long. What rpm are you launching @? |
09-03-2009, 09:19 AM | #6 | |
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Location: Rapid City South Dakota
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Re: Turbo 400 - Good, Bad, and Ugly
Quote:
What do you guys recommend for turbo 400 rebuild kits. This company sounds like it has potential. http://www.monstertransmission.com/ Kick butt music too! |
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09-03-2009, 07:48 PM | #7 |
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Location: Forney TX
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Re: Turbo 400 - Good, Bad, and Ugly
th 400's are cake to rebuild all you need is a small press and a couple seal installers. I would look for one with HD on the case and preferably out of a 2500 truck. Go for a good name brand kit like B&M,or hughes. Also make sure you get one with steeles cause you will prolly need them.
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Troy 1965 Chevy Bagged,361 sbc,voodoo cam,1.5 full roller rockers,patriot 185cc vortec heads 2.02-1.60,vortec weiand polished intake,demon carb my truckhttp://67-72chevytrucks.com/vboard/s...d.php?t=332884 Big Red Dog build http://67-72chevytrucks.com/vboard/s...d.php?t=572274 |
09-04-2009, 11:13 AM | #8 |
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Re: Turbo 400 - Good, Bad, and Ugly
Myself, I'd call Tony at Hughes, tell him what your dyno sheet says, tell him what you have (as in core TH400) and he will put together a 'care package' full of all the parts and pieces you need to build it to Hughes spec. I POUNDED on a Protree brake 400 hughes built for my Nova for 7 years without a hint of a problem. When your doing somewhere between 5-20 transbrake launches a month, on a prepped track, 10-12 months a year in a 3000 pound car, behind 660HP, on 14" slicks... you expect things to break eventually. Well they did,, the driveshaft, U-joints, the 4-link, the richmond gears, the strange axles, sheared all the lugs off once,, everything broke but the trans.
It's not all just about rebuilding with a quality stock component rebuild, it's abut knowhing what components your going to stress and replacing them with more durable items. That's where guys like Tony earn their bacon. Get a list of your combination, dyno sheet and give thm a call.you might find you can buy a new bulletproof Hughes TH400 for not that much more than you can accumilate the parts and buiuld yourself. Or Tony will get you a shopping last together and let you do it yourself.
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Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. |
09-15-2009, 11:40 PM | #9 |
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Join Date: Oct 2005
Location: Rapid City South Dakota
Posts: 39
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Re: Turbo 400 - Good, Bad, and Ugly
Here is some research......
decent stall for the street? http://www.hotrodders.com/forum/dece...ight=turbo+400 THM 400 rebuild ... http://www.digitalcorvettes.com/foru...d.php?t=109572 GM turbo400/475 trans http://www.hotrodders.com/forum/gm-t...ans-93088.html How do I rebuild and hot up t400 transmissions? http://www.hotrodders.com/forum/how-...ight=turbo+400 How to Work with and Modify the Turbo Hydra-Matic 400 Transmission By Ron Sessions http://books.google.com/books?id=JJI...age&q=&f=false TH400 Build Tips with Pics http://www.hotrodders.com/forum/th40...cs-145318.html TH400 build-pictures http://www.turbobuick.com/forums/tra...-pictures.html TH 400 Tail Shaft Change http://www.hotrodders.com/forum/th-4...ight=turbo+400 th 400 transbrake??? or valve body http://www.hotrodders.com/forum/th-4...ight=turbo+400 turbo 400 - strength - recommended upgrades? http://www.hotrodders.com/forum/turb...t=turbo+400+91 Turbo 400 pump converter feed restriction http://www.turbobuick.com/forums/tra...striction.html Turbo 475 check balls http://www.hotrodders.com/forum/turb...ight=turbo+400 Enjoy! Last edited by gene_ensor; 09-15-2009 at 11:41 PM. |
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