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#1
12-11-2002, 08:00 PM
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I just got a short shaft TH400 and I'm thinking about building it to go behind my 455. I have a couple of TH350's and experience building them but I'm thinking the 400 would be better. I know the 1st gear is higher and they rob more power plus weigh more but what do you guys think?
I figure building one should be about the same as a 350. Pros and cons... Thanks  http://motorhead.iwarp.com .030 over 455. Balanced and blue-painted.
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http://motorhead.iwarp.com "Not gonna happen, Slim the Slender Gender Bender." The Book of Misus. Chapter 4, verse 18 |
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#2
12-11-2002, 08:00 PM
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I just got a short shaft TH400 and I'm thinking about building it to go behind my 455. I have a couple of TH350's and experience building them but I'm thinking the 400 would be better. I know the 1st gear is higher and they rob more power plus weigh more but what do you guys think?
I figure building one should be about the same as a 350. Pros and cons... Thanks http://motorhead.iwarp.com .030 over 455. Balanced and blue-painted.
__________________
http://motorhead.iwarp.com "Not gonna happen, Slim the Slender Gender Bender." The Book of Misus. Chapter 4, verse 18 |
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#3
12-11-2002, 08:29 PM
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I used to have a (*choke*) Nova that I had a Chevy 350 in it.I went through 2 TH350's before I put a TH400 truck transmission into it.I had to cut the drive shaft down to make it fit but I never again had any more slipping from the trans.
Hope this helps. Charlie
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Charlie |
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#4
12-11-2002, 10:05 PM
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I brought this up a while back. 400 almost bullet proof from factory. 350 lighter and better gearing. Will keep an eye on this post myself, one reason I am going 350 is just because I have one.
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So let me get this straight: Your Honda has 1.6 liters and my bottle of Mountain Dew has 2? |
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#5
12-11-2002, 10:22 PM
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Turbo 400 is much more durable, especially behind a 455.
I would (and do) give up the power and weight to have dependability. I have broken two turbo 350s behind 455s. I replaced them with turbo 400s. The turbo 400s are still going strong. Todd |
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#6
12-11-2002, 10:58 PM
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I have been running a transbraked TH400 in my 455 powered bracket car for nearly 10 years now. The trans has never been out of the car, still hangin' tough with only fluid and filter changes. [img]/infopop/emoticons/icon_wink.gif[/img]
Let's go racing! www.outlawpontiacs.com/members/B-Man2.php www.outlawpontiacs.com/members/B-Man.php
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#7
12-11-2002, 11:36 PM
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They say the th400 as far as durability is "one of the best, if not THE best, transmissions ever made." heres a link to the info. click on the comparisons link and go down to th 350 then to th400 and compare, I like the 400 having gone thru 2 350s myself.
http://442.com/oldsfaq/oftrn.htm#TRA...n%20Comparison  GR-RRR!
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 1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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#8
12-12-2002, 07:31 AM
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The TH400 is excellent, whereas the TH350 is marginally good. I have had a few TH350'S go south, but never had a TH400 fail. The Chrysler TQ727 is also with the TH400 for the title as best automotive auto transmission.
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#9
12-12-2002, 10:22 AM
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I think if the TH350 is propperley prepped and built with good parts it is just as reliable as the 400 however the 400 wont require the upgrades the 350 had to have to live, so you make th choice. Im running a 350 right now but plan to go to a 400 later on [img]/infopop/emoticons/icon_smile.gif[/img]
Mike |
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#10
12-12-2002, 10:29 AM
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every person I ask in a tranny shop says TH400 was and still is the best ever
can you hear me now? is this thing on? test 1 2 1 2
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can you hear me now? is this thing on? test 1 2 1 2 |
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#11
12-12-2002, 11:47 AM
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Whats the deal Hoffman? I thought you were going for a 200R4. I was waiting for you to do all the legwork so I could plagerize it. [img]/infopop/emoticons/icon_wink.gif[/img]
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#12
12-12-2002, 01:24 PM
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This guy gave me a 400. I'm still thinking about the 200 and I may still do it. (waiting for someone to give me one [img]/infopop/emoticons/icon_razz.gif[/img])
I'm sort of scared to put $600 into a grenade... http://motorhead.iwarp.com .030 over 455. Balanced and blue-painted.
__________________
http://motorhead.iwarp.com "Not gonna happen, Slim the Slender Gender Bender." The Book of Misus. Chapter 4, verse 18 |
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#13
12-12-2002, 02:01 PM
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Well check out that link i put up there, they cover 2004r's also. Lots of info on all of em. 2004r is tempting, just spooky for how expensive it would be to do em right, if right still isnt enough. [img]/infopop/emoticons/icon_eek.gif[/img]
GR-RRR!
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1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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#14
12-12-2002, 05:02 PM
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I ran a T-350 highly highly modified and broke 3 before I went with a T-400 (with only a sprag and clutch upgrade). 3 years later finally going to Freshen it.
But after breaking 2 $300 hub assemblies and 10's of dollars in parts. It wasn't worth it. "If your going to run into the mid to low 11's Ok. The Modified T-350 might hold up." [img]/infopop/emoticons/icon_rolleyes.gif[/img] BTW; Changed to the 400 and ran the same ET 60ft'er and MPH. In the 10 flat range to high 9 range. Build it fast, build it right, build a Pontiac. http://PontiacDude.cc |
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#15
12-12-2002, 05:19 PM
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I've done a lot of research on 2004r's and about half of the sources said it'll last and the other half, well... [img]/infopop/emoticons/icon_confused.gif[/img]
The local trans shop I work with said to go with a 10 vane pump and a billet servo and it should be good to go. I told them I'm probably going to be making 400 plus hp and LOTS of torque. Of course agreement on the TH400 is universal... Probably need to get the engine together first. Should have the heads done by March. http://motorhead.iwarp.com .030 over 455. Balanced and blue-painted.
__________________
http://motorhead.iwarp.com "Not gonna happen, Slim the Slender Gender Bender." The Book of Misus. Chapter 4, verse 18 |
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#16
12-14-2002, 02:05 AM
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If installing a T-400 requires cutting down the driveline, why can't you use a drive line out a car that had the 400/400 setup in it? What is different between the setups?
My other life has meaning....
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"It beats pickin' cotton and waitin' to be forgotten" |
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#17
12-14-2002, 08:58 AM
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I believe I have posted this in the past but when I was running 11.30s in my GP I switched from a TH350 to a TH400. Admittedly the TH350 had held up behind my 400 motor but I felt that it could not last much longer so I made the change just for peace of mind. I had resigned the fact that I would see a loss in ET/MPH but for the long-term plan this was the way to go. Well after the changeover my ET hand no difference and MPH was actually up by .5! The way I see it if you are planning to go with a TH350 for weight and HP savings you are better off going to a TH400. I went with that same idea when the GP was going together and looking back if I had this knowledge then I would have saved myself both time and money by using the TH400 in the first place.
with out questions there can be no answers 1969 Grand Prix [email protected](1.358) [email protected](1.342) WARPed Tepee Forums [email protected]
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1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#18
12-14-2002, 05:18 PM
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This is probalby a pretty dumb question but is the TH400 a 4 speed?
Tyler
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Tyler |
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#19
12-14-2002, 05:21 PM
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3-speed.
Todd "Life is like a roll of toilet paper, the closer you get to the end the faster it goes." |
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#20
12-14-2002, 10:13 PM
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Here is a link to a th-400, www.transmissioncenter.net/200-4R.htm I thought it sounded reasonable. I ended up having my 400 rebuilt w/2400 stall and added a gear vendor unit.
I have no idea if this place is good or not, just found it when surfing. |
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