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#1
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TH400 case rib repair?
I picked up a freshly rebuilt TH400 for my '66 yesterday for a very good price. Only had around 500 miles put on it before the previous owner removed it in favor of an overdrive transmission.
When I got it home and looked things over more closely, I noticed that one of the ribs at the rear was cracked off. I'm thinking it's probably not a big deal for me since my car will mostly be a cruiser and I don't plan on spending much time at the drag strip. However, can this sort of defect be repaired? I don't have the piece that cracked off.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#2
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That is freshly rebuilt? You could clean that missing section real good with brake cleaner and fill it in with JB weld, the stuff that cures fast and file/sand it down.
__________________
“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
#3
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I would use it as is, nobody will see the missing bit when mounted.
Is it an Olds/Buick switch-pitch ST400 or a 1970 and later TH400 (dual connections on the electrical connection)? |
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#4
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Smooth it out with a rattail file and some sandpaper to remove any stress risers that may cause it to crack.
I’m sure the chances of it cracking are slim but it can’t hurt to remove the sharp edges and the sharp dip in the fracture. The engineers added those stiffening ribs for a reason, so at least if it were mine I would spend a little time there just for peace of mind. Adding JB Weld isn’t necessary nor would it add back any strength to that stiffening rib. Run it.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#5
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"Freshly" rebuilt in terms of mileage but not time since rebuild. The previous owner had it rebuilt about 10 years ago when he was finishing up a complete restoration of his GTO. Once his car was put back together, he took a 500 mile road trip in it, but discovered that a TH400 combined with 3.90 gears does not make for good fuel economy. So he had the TH400 removed and put a 200-4R in its place, and the TH400 has sat in his garage for the past decade with only 500 miles on it since rebuild.
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Thanks everyone for confirming what I suspected, which is that although those ribs are there for a reason, it won't pose a problem in my street-driven application. That's good to know. I'm not concerned with appearance in this location, so it sounds like smoothing it out and running it is totally fine.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#6
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Some T-400s have a pressure switch in the valve body for spark control
So 2 prongs for them as well as switch pitch trans |
#7
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#8
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Just sand/grind it smooth you'll be fine. Since it's OUT...remove the speedo plug and see what color drive gear it has....MUCH easier to replace NOW than after you install it.
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#9
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That is a great idea, and an excellent reminder for me since the whole time I was driving the car with the previous trans before restoration began, the speedo was always way off. Now is my opportunity to finally have a speedo that reads correctly.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
#10
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Run it as it is
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The difference between inlaws and outlaws? Outlaws are wanted |
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