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02-10-2011, 05:30 PM
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T-400 torque converter questions
I am looking at torque converters for the THM400 transmission, and am wondering if any of you chevy guys have put a locking type converter in your tranny, or do they make locking types for that transmission? B&M has a wide selection of torque converters but none say if they are locking or not? has anyone installed one of these and know whether they are locking or not??
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02-10-2011, 05:49 PM
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The TH-400 transmission never had a lock-up feature, that I know of. The trans has to be a lock-up type to use a lock-up converter.
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02-10-2011, 09:11 PM
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400: no. 350:yes.
The TH350C was a lockup TC/tranny combo. But there never was a lockup 400.
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02-10-2011, 09:52 PM
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I think Chris at CKPerformance was talking about doing Lockup TH400's on the TurboBuick.com Forum. It's been a while can't remember what ever happened. These would be Custom as none came factory w/Lockup.
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02-11-2011, 10:39 AM
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So there are no aftermarket torque converters that i can get for this transmission that lock up?
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02-11-2011, 12:21 PM
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Quote:
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02-13-2011, 01:47 PM
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Ok thanks, i figured that but i had my hopes kinda high in consideration of gas mileage.. Has anyone ever swapped a thm400 for a 700r4? including the display on the dash for p,r,n,d... i wonder if that would be very hard to do?
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02-13-2011, 03:50 PM
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A lock up converter is only going to net a couple hundred rpm's, not enough to make any real difference in mileage especially considering the cost vs mpg gain.
A 700r4 could be swapped but depending on the application you may be giving up a stronger trans. Depending on the vehicle there are some companies that make replacement shift indicator displays.
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02-15-2011, 04:55 PM
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That is true, i know that the 400 is the toughest one available for a 1986 truck. I bought a new torque converter seal which was my main problem, just a small trans fluid leak, and a new torque converter as well just in case the old one was slipping and causing bad gas mileage.
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02-15-2011, 05:20 PM
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Hi,
Yes. There is a "switch pitch" converter that came in TH-400s in Buicks, etc. in the 1970s. Likely hard to find. Good luck, Matt 
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