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Lock up Torque converter Q #1077989 05/05/15 08:02 PM
Joined: Jul 2002
Posts: 1,758
Jay Ayala Offline OP
Body Damage is Cool
Hello guys,
I was visiting with JohnnyB the other day and we had a conversation that was about fuel mileage and that you could get a little more if you had a lockup torque converter. Last night we were trying to narrow down which year vehicle has these T.C. but could determine it.

Does anyone here know what year donor vehicle I should be looking at to get a lockup torque converter?


89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.
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Re: Lock up Torque converter Q [Re: Jay Ayala] #1077990 05/05/15 08:09 PM
Joined: Jul 2002
Posts: 1,758
Jay Ayala Offline OP
Body Damage is Cool
Found the answer by searching some old threads in the Mitsubishi Tech section.

Quote
Originally posted by BigBlue on Nov. 12th 2002

OK, Mitsu. went to a "lock-up" converter in 'mid year' of 1990. To identify a lock-up vs. a non lock-up, you need to look at the 4th letter on the transmission case (which Mitsu. lists as model V4AW2). If the 4th digit is;
N = Non- lock-up converter
P = Lock-up converter
The serial number has 9 digits and is located on the left side (drivers) of transmission. It's riveted on to the transmission.
They call out the parts that are NOT INTERCHANGEALE as;
Torque converter
A/T oil pump body
Oil Pump inner gear
Oil Pump outer gear
It goes on to say that many parts are interchangeable.


89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077991 05/05/15 09:03 PM
Joined: Jan 2000
Posts: 16,226
off-roader Offline
Web Wheeler
*****
I'm assuming you mean for a v6. I'm not sure about the 2.6L engines but for the v6, 1990 is when they started showing up.


Off Roader
96SR (3.15:1 xcase, 35's)
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Re: Lock up Torque converter Q [Re: off-roader] #1077992 05/05/15 10:25 PM
Joined: Jul 2002
Posts: 1,758
Jay Ayala Offline OP
Body Damage is Cool
Yes, this would be for the 3.0L V6 engine.


89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077993 05/06/15 12:42 AM
Joined: Jan 2002
Posts: 6,129
TOASTY Offline
Trail Leader
*****
Interesting side note, the USDM Delica got fuel injection and a lockup torque converter in 1987. Had they put that combo in the Montero and Mighty Max as well back then we'd have probably thousands more on the road today.


1999 Montero Blizzard package

1991 Montero RS
Re: Lock up Torque converter Q [Re: TOASTY] #1077994 06/06/15 04:31 AM
Joined: Jul 2002
Posts: 1,758
Jay Ayala Offline OP
Body Damage is Cool
Here is a link to the thread I brought up earlier. It's the original lockup torque converter thread.

Has anyone documented how they did this upgrade on a Gen I? I'm specifically interested in a write up and some results. If not I'll plan on doing it myself.

Last edited by Jay Ayala; 06/06/15 05:03 AM.

89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077995 06/06/15 04:39 AM
Joined: Jul 2002
Posts: 1,758
Jay Ayala Offline OP
Body Damage is Cool
I spent a few hours at the junk yard over the past couple days extracting the Torque Converter and the Automatic Transmission fluid pump assembly. I'm freaking sore in wired parts of my body. I didn't know that my Achilles' tendon could get sore. Damn.

I have to find a weeping oil leak on my engine so I'll be pulling it out pretty soon. I'll install that torque converter and the other parts at the same time. I'll be deliberate on how I document this.


89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077996 06/07/15 05:03 PM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Jay, I did that swap a few years ago with a complete transmission. Before I installed it, I completely rebuilt the transmission. Somewhere in the rebuild I made a mistake, which caused me to have it professionally rebuilt. After that, there were no issues with it, but I had a slightly different sort of 3.0L.

The main advantage of the lockup torque converter is better fuel mileage, but it might be at the expense of a smooth power curve through the gears on acceleration. Where the non-lockup torque converter allows the engine to maintain revs during the shift process to build momentum in the next gear, the lockup converter eliminates that and clamps down at the shift. I sensed that a naturally aspirated 3.0L might have a flat spot as soon as the shift occurred - mainly because my engine often went into boost at the shift to main power demand from the throttle setting.

It's entirely possible that the Diamante cams I was using also contributed to the issue for me. The truck cams may work just fine with the lockup converter, since there is more low rpm torque with those than what I installed.


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077997 06/07/15 05:03 PM
Joined: Jan 2004
Posts: 457
M
monte Offline
Mudrunner
Yes, both Kevin and I put a V6 lockup transmission unit in our Turbo 2.6 vehicles. But you are looking a journey ahead.

I wrote up a thread on here called "my transmission swap from hell" <img src="/forums/images/graemlins/lol.gif" alt="" />

You are going to need the bellhousing, lines, linkages, cooler. wiring (or make your own custom for the OD) shifter, etc,etc.

Fun stuff.. ohh yeah.. and it sucks alot of power! If you are interested... I'm thinking about ripping my setup out and putting back in the 5sp!!

Here's the link from back in '11... I'll see if I can get the pics up and running again!
Trans Conversion from Hell!!


1986 SWB Turbo Pajero (aka RedCar). 2" Lift, 33" BFG ATs, Rear locker,Custom 160a Alt, 9000lbs Warn Winch,Con-Ferr Custom built Conferr rack just for RedCar!, Safari Snorkel,3 AGM Deep cycles

1995 SR (Lucky)-SOLD..Kinda sad

Nissan Leaf(Astro), Tesla-S 85kw (Nicoli) & 2014 Rav4EV (Tesla inside)
Re: Lock up Torque converter Q [Re: Jay Ayala] #1077998 06/07/15 05:09 PM
Joined: Mar 2015
Posts: 10
J
jeepfreek Offline
Need a Spot
I just had my lockup torque convertor rebuilt at Superior Torque Converter in PDX. The say the thrust bearings are a weak spot in them and are replaced as well as the clutch lining during rebuild. Cost was $190 with a 3 hour turnaround time! I haven't been able to put much time in my 91 Monty lately. I was hoping for a Memorial Day assembly, but things keep getting in the way.

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