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Topic Review (Newest First)
02-15-2011 05:20 PM
msilveira 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,

02-15-2011 04:55 PM
ChadGresham 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.
02-13-2011 03:50 PM
1ownerT 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.
02-13-2011 01:47 PM
ChadGresham 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?
02-11-2011 12:21 PM
Originally Posted by ChadGresham
So there are no aftermarket torque converters that i can get for this transmission that lock up?
That is correct, because this transmission is not designed for a lock-up converter. There would be no provision in the valve body, case, or input shaft for the hydraulic lock-up fluid path.
02-11-2011 10:39 AM
ChadGresham So there are no aftermarket torque converters that i can get for this transmission that lock up?
02-10-2011 09:52 PM
SSedan64 I think Chris at CKPerformance was talking about doing Lockup TH400's on the Forum. It's been a while can't remember what ever happened. These would be Custom as none came factory w/Lockup.
02-10-2011 09:11 PM
400: no. 350:yes.

The TH350C was a lockup TC/tranny combo. But there never was a lockup 400.
02-10-2011 05:49 PM
ericnova72 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.
02-10-2011 05:30 PM
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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