TH400: Front Stator Bushing, Do I Need One?

[@billlittle4285]

Thanks for this I've been doing tranny's for 40 years, but lately I m intrigued by this I've been restricting both feed and exit over the years In my super stock car and bracket tranny's, I've had good luck but I think I can do better , thanks again

[@teamabaddonracing6870]

Awesome video!!!

[@young11984]

We are all students, always will be until we die. Nobody knows it all, i prefer to know a little about everything than everything about a little. Thanks for sharing your knowledge, i am building a street strip th400 from the ATSG manual and your videos so if it doesnt work its your fault🤣

[@brandonlarkin8111]

I been building transmission professionally for awhile now and done a pretty decent amount of race transmissions but have had a hard time finding information on the when to and when you can get away with not running a front stator bushing on th400s. Information seems very limited and unclear when to and when not to. This video extremely helpful on answering my questions. Thank you for sharing your knowledge. Also like how your explaining exactly what's going on. I am a major believer in understanding exactly what is happening when building transmissions and why you make modifications.

[@mountainsgarage]

Glad to help!

[@brandonlarkin8111]

@@mountainsgarage in fact the transmission I did for a customer with solid shaft no stator bushing when you answered my question in this video so far runs consistently 9.30s with traction issues. Best was 8.72 on prep track with more boost to add. The videos you been posting been a huge help.

[@cfmechanic]

I recently had failure of stator support about half of the teeth were machined off. Made noise for 2 blocks then stopped making noise. Took apart and found this. My trans builder was shocked said he had never seen stator tube fail like that.

[@mountainsgarage]

Not that common on a TH400, interesting??

[@davidsabyan2481]

I've been following your videos for a while, you are modest and humble. I run a 800 hp dart Sbc with NO2 , beleive or not thru a Th350. Lots of good parts in it and get 150 -200 runs between the rebuilds on the trans. I always wondered about the bushing explanations as I have friends running powerglides with th400 torque convertors. Best explaination I have ever seen to understand stator bushings and dump valves!

[@mountainsgarage]

Thanks for watching and the kind words!!

[@LatysGarage]

Fantastic video explained exactly what I needed to know

[@stuartbuckley8720]

You explained that very well, I understood you and followed along with ease, I am not a transmission rebuilding guy, yet? Thank you Shawn for sharing your experience.

[@americanfreedom1]

Absolutely awesome information. I've been stumped on a powerglide issue and this video cleared everything up about the stator tube bushing and how to check the torque converter for a bushed converter. I'm pretty sure I have th350/400 converter that's been bushed for a turbo spline. I say that because it's in the car. It was rebuilt but the stator tube was missing (powerglide with a turbo spline and th350 3500 converter) I have no idea why it was gone. I'd seen a vid saying a turbo shaft needed a th400 stator tube. No mention of having a torque converter with a bushing in it untill latet after I'd went through it. My powerglide now only starts pulling at 4200 and it pukes fluid out of the vent tube. I believe it having a bushed stator tube and more than likely a bushed converter is probably messing with the flow circuitry. Either way I'm very greatful for explaining how to check for a bushed converter etc.

[@mountainsgarage]

Glad I could help!

[@Boostismyfriend]

This is a great video, i gave you a shout out in my last video about this!!!

[@mountainsgarage]

Appreciate it! And I found a new channel to watch!!

[@Boostismyfriend]

@@mountainsgarage the same!!!

[@skywaves5175]

Another great video. I always enjoy learning from a senior master mechanic. Thanks for your time and money to put out great videos.

[@BigFun4Life]

As always thanks Shawn for sharing your knowledge..

[@billlittle4285]

Your work bench looks like mine lol

[@gregsmith9457]

👍👍👍

[@daveweeks8325]

Thank you for your explanation, another great video. Your videos helped me finish my first transbrake 400 this weekend. Time to test and I'm already getting excited to build the next one. Keep up the great videos!

[@1320wolf]

Really good stuff!!

[@BigMikesGarage]

Good info! Making me second guess my setup. About to pull the trans to change the converter, so I'll use this newly acquired info to verify that my setup is correct. Thanks! That piece of material I spy chucked up in the lathe looks like it could be the makings of an axle register spacer???? ;)

[@mountainsgarage]

You have a good eye!!

[@BigMikesGarage]

@@mountainsgarage Hey Shawn, I sent you a message on FB. If you have just a minute could you answer a question for me? Thanks.

[@moodybluemotorsportsDwneKnos]

Brother I felt so not alone when you stated you had been doing more work for ppl than you' did for yourself lol and hoped that's about to change. I've felt that so much especially here past few months. We do restoration and race type work and its quiet timely. I hope to also change that myself

[@mattiasjansson4102]

Great info , im in the prosess of building a Race Th400 with Internal dump , dumping pressure before the converter charge. Another question , what could cause a premature pump bushing wear? , my 4l80e with a Ck transbrake ate the bushing making the lockup drag bad (1000mile Dragweek style event)

[@mountainsgarage]

Interested in hearing about the internal dump. Pretty rare to hurt the pump bushing, has to be lack of lube or an out of round issue? They are originally staked and restaking is difficult. Cylindrical Part Bonding works also.

[@mattiasjansson4102]

@@mountainsgarage yeah i will try loctite , i will get Coan brand internal dump kit it comes with the pump housing where its tapped into the converter charge side im sure it is possible to diy

[@JasonOKeefe-u3r]

Does this mean you have to remove some splines on solid input shaft to enhance fluid return to transmission seeing as though there's no return hole at the end of the input shaft?

[@mountainsgarage]

I have heard of people doing that, but would hate to ruin an expensive shaft, works good with the front bushing removed.

[@alanjanderson9789]

Hi Shawn great video just a question on the front stator tube at what HP would change it out for a chrome molly or after market billet one cheers from OZ

[@cfmechanic]

I have same question 🤔 I'm definately over 500 flywheel and had stator tube fail but I believe the convertor to be at fault

[@cfmechanic]

Is a hardened stator tube a nessecary upgrade at this point or was I just unlucky

[@MHolt3573]

Thank you for breaking it down and explaining this stuff sir. One question I have is, what does the stator shaft spline into in the convertor?

[@mountainsgarage]

The sprag in the Stator splines onto it. Holds one direction.

[@MHolt3573]

@@mountainsgarage thank you sir. So it holds a sprag inside the torrent convertor.

[@jakestree1892]

If I have a th400 with a stock input and a bushed converter will it be ok if remove the front stator bushing?

[@thomascherry3759]

I rebuilt my turbo 400 but it goes only in one drive gear know matter where I put the shifter do I have the wrong gasket on my valve body

[@WOODSIDEtheGUY]

Nobody explains chevy transmissions better than Shawn from Mountains Garage

[@shadowopsairman1583]

Richard and Teresa Crich