TH400 gutting
#1
TH400 gutting
Hey guys,
My TH400 on my car worked perfectly until removal. No clutches slipped. Nothing like that. But as I dropped the oil pan, 2 screws snapped/sheared off. I've bodged them but I don't like it.
I have a second tranny, from a 1990 model. So it is the same BUT it has more miles and I don't know what condition it is in. I know it had like 2x the mileage as opposed to my 78k miles.
So, my thought was: Remove the inside from my tranny and put that into the good housing of the 1990 one. Also replace the tag to keep matching numbers...
I have heard that you need special tools to get the TH400 set up correctly, is that true?
Cheers
Damien
My TH400 on my car worked perfectly until removal. No clutches slipped. Nothing like that. But as I dropped the oil pan, 2 screws snapped/sheared off. I've bodged them but I don't like it.
I have a second tranny, from a 1990 model. So it is the same BUT it has more miles and I don't know what condition it is in. I know it had like 2x the mileage as opposed to my 78k miles.
So, my thought was: Remove the inside from my tranny and put that into the good housing of the 1990 one. Also replace the tag to keep matching numbers...
I have heard that you need special tools to get the TH400 set up correctly, is that true?
Cheers
Damien
Last edited by Daim; 12-19-2017 at 07:48 AM.
#2
Well... if you couldnt remove / repair two snapped screws from an aluminum case you might not have the skills or knowledge necessary to re-body a complete transmission. Install the 90 TH400 and hope for the best. They were designed for big block in 6000Lb trucks so chances are it's just fine.
If the sealing surface was damaged it can cleaned and built up with alu welding rod and refinished, then new bolt holes can be drilled and tapped, offset if necessary.
If the sealing surface was damaged it can cleaned and built up with alu welding rod and refinished, then new bolt holes can be drilled and tapped, offset if necessary.
#4
Well... if you couldnt remove / repair two snapped screws from an aluminum case you might not have the skills or knowledge necessary to re-body a complete transmission. Install the 90 TH400 and hope for the best. They were designed for big block in 6000Lb trucks so chances are it's just fine.
If the sealing surface was damaged it can cleaned and built up with alu welding rod and refinished, then new bolt holes can be drilled and tapped, offset if necessary.
If the sealing surface was damaged it can cleaned and built up with alu welding rod and refinished, then new bolt holes can be drilled and tapped, offset if necessary.
I rebuilt my 5hp24 tranny in April. I am very sure I can get an old TH400 sorted. Thank you...
I was hoping for someone to have some experience with the TH400 but seems people question my intelligence instead.
Last edited by Daim; 12-19-2017 at 08:36 AM.
#5
OB, thanks for the idea, but I already did that. As the extractors didn't help to budge the screws, I srilled them out and that is why I am unsatisfied. The holes are too big. I already have fitted new gaskets and loads of RTV to seal it all but I just don't like it like that. Means more hassle getting for example the filter changed etc.
#7
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#11
I've not done a TH400, but I have helped a friend do a Ford C6. I recall looking at the manual when my TH400 failed and I think you'll need some large snap ring compressors and spring compressors to get things apart.
In my experience they seem to last about 160,000 km and then need a rebuild. In mine the plates in the clutch pack with the scalloped edges broke up, so first and third clutch packs were engaged at the same time.
I'd pick up a rebuild kit and manual from Rock Auto and look at lots of youtube videos to see what tools are needed. You can probably add extra friction plates and steels to the clutchpacks to increase capacity, you'll just need a thinner steel backing plate to keep the overall clutch pack thickness the same. That's a fairly common upgrade for automatics.
Just be patient, take your time, and make sure everything is surgically clean and perfectly to specification in terms of thicknesses, clearances, etc.
In my experience they seem to last about 160,000 km and then need a rebuild. In mine the plates in the clutch pack with the scalloped edges broke up, so first and third clutch packs were engaged at the same time.
I'd pick up a rebuild kit and manual from Rock Auto and look at lots of youtube videos to see what tools are needed. You can probably add extra friction plates and steels to the clutchpacks to increase capacity, you'll just need a thinner steel backing plate to keep the overall clutch pack thickness the same. That's a fairly common upgrade for automatics.
Just be patient, take your time, and make sure everything is surgically clean and perfectly to specification in terms of thicknesses, clearances, etc.
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Daim (12-19-2017)
#12
#14
I was thinking of writing something insulting but thought that I'd prefer to leave you on your niveau below mine...
Last edited by Daim; 12-19-2017 at 01:27 PM.
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icsamerica (12-19-2017)
#16
OB, thanks for the idea, but I already did that. As the extractors didn't help to budge the screws, I srilled them out and that is why I am unsatisfied. The holes are too big. I already have fitted new gaskets and loads of RTV to seal it all but I just don't like it like that. Means more hassle getting for example the filter changed etc.
If you drilled them out and now the holes are too big you could use Timeserts these are like helicoils but better.
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#17
STOP THE INSULTS, this is a friendly forum and lets keep it that way.
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#18
That's not an insult. It's a observation. An insult would have been to point out that using "Loads of RTV" on a transmission pan is the marque of a sketchy mechanic. I know, I know, it's just temporary for 2 years. We can keep going, we do this for fun here in the big apple.
#19
Seems a straight forward job. Just checked, I already have the Jaguar repair manuals for the TH400 as well as the 4 speed from later models and the 4 speed manual. Would be a great chance to see if I can upgrade it a little. Some shift quality upgrades should be possible as well as a proper 1st lock up without the forced upshift...
#20
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Daim (12-19-2017)