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Unread 06-14-2011, 12:15 PM   #1
Truck633
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Torque converter question

My searches have come up empty, so I am going to ask. What is the difference between a lock up, and non lock torque converter? I understand the stall rpm, but can't seem to find an answer to this. Or the simple question is which converter do I need for my TF999?

The input shaft is splined to the very end, ie no smooth part, so I think it would be the non lock up, however a thread I read said, a mechanical lock up rather than an electronic one??????

Thanks in advance

Tom

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Unread 06-14-2011, 12:41 PM   #2
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The lock up TC has a clutch kind of setup inside the converter. They drop RPM's about 500. And are then the same as a standard transmission, untill they unlock.

A non lock TC will have slippage.

I think lockup TC's are used to increase fuel mileage .

Bill
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Unread 06-14-2011, 01:34 PM   #3
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Quote:
Originally Posted by lucdog View Post
I think lockup TC's are used to increase fuel mileage .

Bill
Yes.

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Unread 06-14-2011, 02:03 PM   #4
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Will either one work in my case?
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Unread 06-14-2011, 02:15 PM   #5
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Quote:
Originally Posted by Truck633 View Post
Or the simple question is which converter do I need for my TF999?

The input shaft is splined to the very end, ie no smooth part, so I think it would be the non lock up
You will want the non-lockup low stall one. Splines to the end means non lockup. The CJ and early YJ (pre 91) 999 did not have the electronic lockup. The ones that were lockup units were mechanical/hydraulic.
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Unread 06-14-2011, 02:16 PM   #6
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Thanks!!!
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Unread 06-14-2011, 03:06 PM   #7
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Question, does a non lockup, have a stall speed?

Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
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Unread 06-14-2011, 03:08 PM   #8
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for comparison here's what a mechanical lock up shaft looks like

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Unread 06-14-2011, 03:13 PM   #9
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Quote:
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for comparison here's what a mechanical lock up shaft looks like

OK..Mine is splined all the way to the end.
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Unread 06-14-2011, 04:50 PM   #10
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Quote:
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Question, does a non lockup, have a stall speed?

Bill
Yes. When you go to buy the converter they will offer both high and low stall.
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Unread 06-14-2011, 05:50 PM   #11
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Thank you, Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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