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Old 08-01-2009, 09:04 PM   #1
1977 28' argosy moho
 
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Non-Automatic Transmission - TH400

We just came back from a weeks vacation and I had a funny problem with the TH400. It seemed a bit sluggish accelerating and I discovered that it wasn't changing from third gear. It was starting from stop in third and staying in third even after I added almost a quart of tranny fluid to bring it half way up the hash marks on the dipstick. The last couple of days I was doing the shifting and it operated normally in all three gears, just wouldn't shift gears by itself. I'm no mechanic, but I've never heard of this before. I have an extra transmission cooler and the return line was leaking a bit. Any comments, solutions or further questions?
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Old 08-01-2009, 09:23 PM   #2
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Maybe you could call a reputable transmission shop to be sure but it sounds like the valve body is hanging up and not allowing the trans to come back down into first gear. Whatever it is it will likely happen again. I would get it checked out by a professional.

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Old 08-02-2009, 12:21 AM   #3
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Hi, take your transmission to the shop and have them remove the pan. If it has metal flake in it chances are, your transmission has one or more failing parts. Metal particles going through the system can and will, among other things, cause the valve body valves to stick. At this point you will either need to replace or rebuild your transmission.
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Old 12-26-2010, 06:19 PM   #4
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So whatever happened with the Transmission Malfunction

I sometimes wonder why, after a year. No one reports Back.
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Old 12-27-2010, 12:10 PM   #5
1977 28' argosy moho
 
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Transmission Update

Thanks for the interest. My moho is still in the same shape, sitting in the garage. I've also recently been told to check the vacuum lines to the modulator valve but since its about 0 degrees outside, I'm going to wait a few months. I'll let you know whats what when I find out. Happy Holidays!
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Old 12-28-2010, 03:16 AM   #6
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Great, good to know you still have the coach and that you are well.

Happy New years Wards

Hope you get to find the issue. something simple I do Pray.

Keep us posted.

carefully check ALL the vacuum lines
Flush the system and install a new Transmission filter and new fluid. May do the Trick.
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Old 02-12-2011, 01:24 PM   #7
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Had a similar thing happen to my 87 Suburban that has a 454/TH400.
It had 100k miles on it when I got it and the only issue I even noticed was no lockdown in 2nd gear either down thru the gears, or in 2L. If you put it in 2L on a hill, it would run away like it was in N, so no long hill engine braking.
It was like that for 10 years, and I was not worried about it, but after the engine needed a rebuild, I kinda planned to pull the trans and go thru it. I did pull the pan and it all looked clean and tidy inside, so I left it for later.
When I used it to move house in 2010, it started to play up...
First I noticed that it was only changing up to 3rd on a very light throttle, then within a few hundred miles not at all. Next quite quickly it was slipping in 2nd and jerking. I also noticed, when idling, it is making a whining noise.
Then on an uphill light, it revved and barely made it up the hill at 3000rpm.
Its stashed it at my storage pending a trans rebuild.
I have the rebuild kit ready!
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Old 02-12-2011, 01:37 PM   #8
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Always thought TH-400's were bullet proof.
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Old 02-12-2011, 01:41 PM   #9
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The loss of 2L is common...
Trucks and M/H's are a biug stress on the 2nd gear hold band...

The friction material from the factory was soft, and wore out quickly with the heavy loads on long hills, and downchanging to 2L under load.
The suggested fix is an upgraded kevlar band and a stronger sprag... whatever that is!
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Old 02-12-2011, 02:39 PM   #10
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Quote:
Originally Posted by Keyair View Post
The loss of 2L is common...
Trucks and M/H's are a biug stress on the 2nd gear hold band...

The friction material from the factory was soft, and wore out quickly with the heavy loads on long hills, and downchanging to 2L under load.
The suggested fix is an upgraded kevlar band and a stronger sprag... whatever that is!
I had the same thing on an old Chev pick up, pull the lever into 2nd downhill and you are in neutral. The trans guy said there is a band that is only used when you pull the lever into 2nd. If you pull a trailer and use 2nd down hill the band gets hot, crystalize and will break. He said it has no other function in the trans and 2nd will work normally as long as you leave the lever in D. To replace you may as well overhaul at the same time. I put 50,000 miles on the truck with the broken band.

When I had the trans out of the moho I ask the guy about the 2nd gear band and he showed me a new heavy duty band that he uses and he said I can use 2nd down hill all I want and not worry with the heavy band. It's just one of those TH400 quirks.

Cheers, Dan
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Old 02-12-2011, 05:56 PM   #11
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If you want the best in parts and features I suggest you check out Product Comparison: TH-400 Mega Monster Transmission Complete Rebuild Kit VS TH-400 SS Mega Monster Transmission Complete Rebuild Kit They are very strong in the off road market and trucks that have been modified which means they know all the weak links and have HD parts to replace them with. At the very least I'd use a full synthetic fluid on your rebuild.
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Old 02-12-2011, 11:27 PM   #12
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Quote:
Originally Posted by Keyair View Post
The loss of 2L is common...
Trucks and M/H's are a big stress on the 2nd gear hold band...

The friction material from the factory was soft, and wore out quickly with the heavy loads on long hills, and downchanging to 2L under load.
The suggested fix is an upgraded kevlar band and a stronger sprag... whatever that is!
Hi, it's been about forty years since I was inside of a Turbo-400 trans. My understanding at the time was that all of the gears were operated by clutches, except when held in gear manually, then the bands were applied to double up on gear holding power. A sprag is a one-way clutch that works with rollers on ramps; These are used to over-ride the previous foreward gear.
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