Torque converter 2nd & 3rd lockup?

texcat101 · 02-08-2009, 05:41 PM

With the swap I am doing I have the option of wiring my 700r4 torque converter with a switch that would allow me to lockup the T/C in 2nd and 3rd or 4th only at my choice.
I have been trying to get my mind around the value of the 2nd and 3rd lockup and am not sure I see many real world instances where it would be beneficial.
I know lockup creates less heat, so maybe extended driving in the lower gears like on mountain roads... has some value.
Am I missing something?

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okie81 · 02-08-2009, 09:22 PM

Well, you would think that the 2nd and maybe the 3rd lockup might be handy for passing, but if you floor it, you're gonna downshift anyways. I had a camaro with a 700R4 and the lockup was really touchy in 4th so it would be nice to be able to hold it in there when you needed to.

texcat101 · 02-09-2009, 11:07 AM

I think I will wire it up for 2nd, 3rd & 4th on one leg and 4th only on the other and see how it functions.
I will post my results.

okie81 · 02-09-2009, 11:15 AM

Either way you go, that's a killer option to have at the flip of a switch, good luck with that.

91diesel · 02-09-2009, 07:44 PM

I put in a relay with a floor switch in my Toyota auto (343f) for this option. I did it because I have a diesel and try to get really good mpg by going easy from stops. The high factory stall (2200 rpm) makes this a pita so I lock it up @ 15mph in 2nd and then shift through the gears keeping it between 1500-2100 rpm which works great for the diesel. The floor switch makes it nice to turn off and on easily in traffic.

texcat101 · 02-10-2009, 12:09 PM

Quote:

Originally Posted by 91diesel

I put in a relay with a floor switch in my Toyota auto (343f) for this option. I did it because I have a diesel and try to get really good mpg by going easy from stops. The high factory stall (2200 rpm) makes this a pita so I lock it up @ 15mph in 2nd and then shift through the gears keeping it between 1500-2100 rpm which works great for the diesel. The floor switch makes it nice to turn off and on easily in traffic.

Nice! The way mine will be wired I will have 2,3&4 lockup in one position, I will watch what this selection does to the fuel economy... driven slow and easy.
I am installing an LED indicator so I will be able to tell what I have selected more easily. I like the floor switch idea!

ffryno13 · 03-31-2009, 02:39 PM

where did you get this lock-up switch from. cuz i am doing pretty much the same set up as you i just havent decided on runnigh the stock ECU or using the mega squirt 2 system yet.

02-08-2009, 09:22 PM	#2 (permalink)
okie81 Registered User Join Date: Aug 2008 Location: Nor, CAL Posts: 1,158	Well, you would think that the 2nd and maybe the 3rd lockup might be handy for passing, but if you floor it, you're gonna downshift anyways. I had a camaro with a 700R4 and the lockup was really touchy in 4th so it would be nice to be able to hold it in there when you needed to. __________________ 2001 Toyota 4Runner SR5 4-Dub TRD supercharger, Thorley Headers, URD 7th, Toytec Coilovers, OME 890's, baseball card in spokes

02-09-2009, 11:07 AM	#3 (permalink)
texcat101 Registered User Join Date: Mar 2008 Location: W. Texas Posts: 367	I think I will wire it up for 2nd, 3rd & 4th on one leg and 4th only on the other and see how it functions. I will post my results. __________________ 85 4runner, 3" spring lift, 4Crawler 2" body lift, Precision Gear 5.29's w/power brute posi frt & rear, M/T Baja MTZ 33x12.5x15, Warn M8000 winch, Optima redtop, Marlin Crawler Front, Rear Bumpers and Sliders, Allpro crossover steering & U bolt flip, LC rotors, '94 calipers and booster. 4.3 vortec / 700r4, Megasquirt II, EDIS6

02-09-2009, 11:15 AM	#4 (permalink)
okie81 Registered User Join Date: Aug 2008 Location: Nor, CAL Posts: 1,158	Either way you go, that's a killer option to have at the flip of a switch, good luck with that. __________________ 2001 Toyota 4Runner SR5 4-Dub TRD supercharger, Thorley Headers, URD 7th, Toytec Coilovers, OME 890's, baseball card in spokes

03-31-2009, 02:39 PM	#7 (permalink)
ffryno13 Registered User Join Date: Sep 2008 Location: banks, oregon Posts: 181	where did you get this lock-up switch from. cuz i am doing pretty much the same set up as you i just havent decided on runnigh the stock ECU or using the mega squirt 2 system yet. __________________ 1990 PU total of 8" lift, SAS, 5.29 gears, front lock right rear spool, 22re, 5 speed, std cab, short bed, supra AFM, thorley header, and 37" toyos. future mod: some spydertrax full axles as beefy as they got' em,ARBs front and rear, and some good bumpers, supra 7mgte with all the go-fast parts, new cab and body. 1994 2wd PU LCE intake and full custom exhaust.-for sale.

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02-09-2009, 07:44 PM	#5 (permalink)
91diesel Registered User Join Date: Jun 2007 Posts: 202	I put in a relay with a floor switch in my Toyota auto (343f) for this option. I did it because I have a diesel and try to get really good mpg by going easy from stops. The high factory stall (2200 rpm) makes this a pita so I lock it up @ 15mph in 2nd and then shift through the gears keeping it between 1500-2100 rpm which works great for the diesel. The floor switch makes it nice to turn off and on easily in traffic.

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