Torque converter question - JeepForum.com

 
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post #1 of 11 Old 06-14-2011, 01:15 PM Thread Starter
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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post #2 of 11 Old 06-14-2011, 01:41 PM
lucdog
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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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post #3 of 11 Old 06-14-2011, 02:34 PM
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Quote:
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I think lockup TC's are used to increase fuel mileage .

Bill
Yes.

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post #4 of 11 Old 06-14-2011, 03:03 PM Thread Starter
Truck633
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Will either one work in my case?

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post #5 of 11 Old 06-14-2011, 03:15 PM
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Quote:
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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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post #6 of 11 Old 06-14-2011, 03:16 PM Thread Starter
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Thanks!!!

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Quote:
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It's like dads new mistress. You hate her until you see her boobs.
Quote:
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I bet the new bike riding monkey will pedal a lot faster!
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post #7 of 11 Old 06-14-2011, 04:06 PM
lucdog
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Question, does a non lockup, have a stall speed?

Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #8 of 11 Old 06-14-2011, 04:08 PM
ctm
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for comparison here's what a mechanical lock up shaft looks like

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post #9 of 11 Old 06-14-2011, 04:13 PM Thread Starter
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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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It's like dads new mistress. You hate her until you see her boobs.
Quote:
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I bet the new bike riding monkey will pedal a lot faster!
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post #10 of 11 Old 06-14-2011, 05:50 PM
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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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post #11 of 11 Old 06-14-2011, 06:50 PM
lucdog
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Thank you, Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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