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Old 05-30-2010, 01:21 AM   #1
RedRocketS10
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Default TH400 Aluminum Direct thrust washer wear..

Wondering if anyone has installed a Torrington style bearing between an aluminum direct drum and the forward hub to eliminate (or fix) wear issues? I gained about .020" end play in the front half of the tranny, found the drum is worn from the thrust washer. Or is there a better option for a washer? Just using the OEM style brass/bronze right now.

How much is too much for ring wear in the drum? Say .005" or so? Can a guy get away with polishing the groove out somewhat?

Also, which is better- scarf cut teflon or the (I think) 4L80 split teflon rings for an aluminum drum?

Thanks!
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Old 05-30-2010, 02:43 PM   #2
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Default Re: TH400 Aluminum Direct thrust washer wear..

I install a torrington bearing at that location on every Th400 or 4L80E I build.
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Old 05-30-2010, 04:20 PM   #3
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Default Re: TH400 Aluminum Direct thrust washer wear..

Luckily upon further measurement comparing to an OEM iron drum it's only worn .005". What bearing do you use? I remember reading something about one from an AXOD-E. I thought about using one of them from the TH400 planetary, but I would have to machine a slight counter bore in the drum and sleeve the forward hub to properly center the bearing. Neither would be ideal IMHO.
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Old 05-30-2010, 06:25 PM   #4
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Default Re: TH400 Aluminum Direct thrust washer wear..

You can use one out of axode from the diff but you will need the thinest pump washer.I think the washer is around 60 to 62 thou.The other way is to use the brg between rear ring gear and output shaft( th400 ) and then i think you will need a pump washer around 90 to 95 thou.You do have to machine out direct drum for brg and the instructions are on Coans web site.
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Old 05-30-2010, 09:51 PM   #5
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Default Re: TH400 Aluminum Direct thrust washer wear..

Nice to see people have adapted my use of the AXODE final drive sun gear bearing at that location.It is a perfect fit.
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Old 05-30-2010, 10:24 PM   #6
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Default Re: TH400 Aluminum Direct thrust washer wear..

Try installing the 922 bearing from the back of the trans , the alum drum you have may already have a step machined in it to accept the bearing lip and the fit to the hub is not perfect but works just fine. If you want to continue to use the thrust washer make sure its nylon. There will be some wear when using teflon rings but thats par for the course with alum drums. If it gets too bad the drum can be sleeved.


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Old 05-31-2010, 01:28 AM   #7
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Default Re: TH400 Aluminum Direct thrust washer wear..

Thanks everyone! Great info!

Hutch, it only has what looks like a very small snap ring groove in the bore but it measures small by .050" or so. I'll load it on the Bridgeport tomorrow and cut the counterbore. I have a few of those bearings in on the shelf so I'll just use em up.

Would it make any sense to cut the forward drum for a torrington too? Looks like it'll fit with the same mods.

Interesting thing with the ring wear.. The middle of the three on the center support is by far the worst, the other two are only a scuff.. I'll run it another year, maybe sleeve it next winter.

These are the questions I should have asked when I built this thing.. LOL!! Looking back it would have been much cheaper (and easier) to just buy a finished tranny.. On the positive side- after 100+ passes everything else looks like new and I've learned something!!
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Old 06-01-2010, 12:03 AM   #8
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Default Re: TH400 Aluminum Direct thrust washer wear..

If you have an aluminum forward drum and your seeing wear in that area then a bearing would help there also. If its not a problem then don't worry about it as for the most part the drum and hub are always turning together.


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Old 06-01-2010, 02:48 PM   #9
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Default Re: TH400 Aluminum Direct thrust washer wear..

Wouldn't the graphite seals be best for aluminum drums?
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Old 06-01-2010, 07:29 PM   #10
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Default Re: TH400 Aluminum Direct thrust washer wear..

Quote:
Originally Posted by Jp outlaw View Post
Wouldn't the graphite seals be best for aluminum drums?
They chew the shit out of aluminum.

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Old 06-02-2010, 12:43 PM   #11
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Default Re: TH400 Aluminum Direct thrust washer wear..

Quote:
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They chew the shit out of aluminum.

Hutch
not sure what I was thinking. Graphite and teflon can both "cold flow" thus embed particles and become sand paper.

maybe a delrin or UHMW material would be good for aluminum then?
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Old 06-02-2010, 01:12 PM   #12
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Default Re: TH400 Aluminum Direct thrust washer wear..

Sonnax Part# 96403, set it on the back of the foward hub and forget about it. No muss, no fuss!
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Old 06-02-2010, 07:06 PM   #13
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Default Re: TH400 Aluminum Direct thrust washer wear..

Mike, is that number correct? Just went to the Sonnax site and nothing found under the 96403 designation...
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Old 06-03-2010, 07:15 AM   #14
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Default Re: TH400 Aluminum Direct thrust washer wear..

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Originally Posted by Shoedoos View Post
Mike, is that number correct? Just went to the Sonnax site and nothing found under the 96403 designation...

Huh! I couldn't find it on their site either. I just looked at the bag of them that i have and the part number is 96403. The book that i got them out of is: sonnax transmission specialties vol 7, page 157 , 15 up from the bottom.
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