durability of A340F auto tranny and related info (long)

nhparrot · #1 (**permalink**) 03-28-2002, 04:22 PM

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Topic: durability of A340F auto tranny and related info (long)
taco
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Member # 749

Rate Member posted 02-28-2002 01:56 PM
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Marmot- same ratios. Level ten has a bunch of stuff, alot more than I thought at first. I am waiting for the s/c before I move on with anyhting else.
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Posts: 17 | From: plymouth | Registered: Feb 2002 | IP: Logged

Marmot
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Member # 2321

Rate Member posted 02-27-2002 11:37 PM
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Taco - great info about Level 10. I wasn't aware of the rebuild kit. Sounds like something I could easily use in the future.

Tundraon42s - That's awesome to hear that it's surviving all that.

About the gear ratios, I'm looking for the 1st-4th gear ratios.
The 4Runner/Taco/V6 Tundra have:

1st is 2.804
2nd is 1.531
3rd is 1.000
4th is 0.705

Anyone know what ratios are behind the V8?
Thanks again,
Jeff
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Posts: 5 | From: Arvada, CO | Registered: Feb 2002 | IP: Logged

Albee
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Member # 1347

Rate Member posted 02-27-2002 05:46 PM
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Jeff, Dont know for sure if this is what you want, but the rear axle ratio is 3.91. (Fairly low to me.

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2001 SR5 Acess Cab TRD 4x4. Desert Sand, TRD Dual Exhaust, Cabelas Bug Deflector, Vent Shades, Delta Aluminum Tool Box, DEI Python Alarm System

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Posts: 18 | From: Wyoming | Registered: Feb 2002 | IP: Logged

tundraon42s
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posted 02-27-2002 04:33 PM
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the tundra tranny is a very relaiable tranny, I havent had any probs with mine spinnin my 42in tires wich are very heavy, i recenly towed a 4000lbs plus trailer for 4 hours srait with a average speed of 80mph and had no problems

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Biggest tundra on the streets, check out April issue of Fourwheeler magazine

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Posts: 18 | From: daytona beach | Registered: Feb 2002 | IP: Logged

taco
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Rate Member posted 02-27-2002 03:58 PM
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Level ten also makes a clutch kit which is just a rebuild kit with better clutches and bands and they also porduce a torque converter, compuer, and a full tranny as well as the valve body upgrade. I am interested in hearing where the internals were different? I plan on the trd 4.7 s/c when it comes out and I am also doing the valve body as well as an additional cooler with synthetic oil and maybe the torque converter and computer/ and or the rebuild kit.I want my truck to last and be awesome in the process, especially off road.The 4.7 is a great motor but lacks in the botom end, not enough low end torque.
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Posts: 17 | From: plymouth | Registered: Feb 2002 | IP: Logged

Marmot
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Member # 2321

Rate Member posted 02-27-2002 08:30 AM
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Yes, Tacos/4Runners do come with a tranny cooler built into the bottom of the radiator. But I can't tell what size it is, though. It's probably pretty small. I haven't researched how many of those 4 that failed were using a tranny cooler prior to the failure. Many of the 4Runners I know have added a secondary tranny cooler. Mine is 10"x11" from Level 10, which supposed to be large enough for an RV.

None of those 4 failures had larger tires than the stock 265/70R16 (basically 31x10.5). I haven't regeared yet for my 285/75R16 (33x11.5) but plan to go from the stock 4.30's to 4.88's when the front ARB locker comes out in the next few months. As was said, I did take a hit on acceration and braking, but it's liveable with the supercharger.

In comparison, the stock 4Runner is rated to tow 5,000 pounds. The Tundra's stock peak torque output is 315 ft-lbs, as compared to a supercharged 4Runner's 275 ft-lbs. So I'm definitely envious of whatever improvements they made to your transmission to handle that.

T'sToy - Thanks for the offer to see it sometime. I'll let you know if my research looks promising enough to check it out further.

Myself and others will also need to find out if the Tundra's transmission control module (TCM) is separate from the ECU. I need to figure out where it is on my 4Runner.

Thanks,
Jeff

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Jeff
2000 4Runner SR5, TRD supercharger, SAW coil-overs and OME springs for 2.5" lift, 285/75R16 MT/R's, custom front and rear bumpers, rocksliders

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Posts: 5 | From: Arvada, CO | Registered: Feb 2002 | IP: Logged

TundraGuy
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Member # 11

posted 02-27-2002 07:39 AM
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From what I understand, the big difference in the level10(?) upgrade is that it makes the tranny shift faster which reduces heat buildup. A transmission cooler would help and the Tundra already happens to have one.

I would assume that the stock trans is built to handle towing 7200lbs it's *probably* strong enough for the supercharger, but who knows...

Sean

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'02 Tundra Ltd 4x4, Black/Oak, Huper Optik Stark 30 tint, more mods to come...

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Posts: 91 | From: Austin, TX | Registered: Feb 2002 | IP: Logged

T'sTOY
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Member Rated:
posted 02-27-2002 07:39 AM
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Jeff,

Have you changed the gears on your Runner to handle the larger tires? I have a set of Downey coil-overs I plan to add, and I want to go to larger tires, but am concerned about going to 285/75s due to the loss of power I believe I would experience. I've got 265/75s and I' ve noticed a change just driving to work on Hwy.93.

By the way, if you want to get an up close and personal look at a Tundra 4x4, let me know, I live in Golden, just west of Westwoods Ranch.

T
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Posts: 51 | From: Golden, CO | Registered: Feb 2002 | IP: Logged

lelandstanford
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Member # 539

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posted 02-27-2002 06:38 AM
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Do these supercharged Taco/4Runners have auxilary transmission cooler?

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Posts: 64 | From: Houston, TX | Registered: Feb 2002 | IP: Logged

Marmot
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Rate Member posted 02-26-2002 11:28 PM
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I own a 2000 4Runner, which shares the "A340F" designation of the auto tranny with the 4x4 Tundra and Tacoma. I'm trying to research more about these transmissions. So I'm sharing a variety of info with you and I'm hoping to learn a bit.

There are at least four supercharged '96-'01 4Runners in the on-line 4Runner community that have destroyed their auto transmission. Fortunately, three of these had them replaced under warranty. The other one was Gadget that you may have heard of at www.gadgetonline.com . Plus, I'm not sure how many Taco's have destroyed their A340F's.

So, a bunch of supercharged 4Runner owners have now purchased an upgraded valve body from www.levelten.com. It's actually each person's original valve body that's been modified by Level10. This isn't supported by Toyota or TRD, but it changes the way it shifts and changes some pressures and somehow preserves the life of the transmission. I'd guess the valve body on the Tundra is most likely different, but at least this is a possibility for you guys to check into if you add your supercharger to the V8 and start destroying trannies.

I had my local dealership check part numbers, but every internal transmission replacement part that he checked was a different part number between the 4Runner's A340F and the Tundra's A340F. So despite the same external tranny model number, yours are apparently sooped up to handle the added torque. Thus the outside interest in your tranny.

BTW, the A340 is made by Aisin. The A340 series transmissions started in the late '80's and were also used in many years of Isuzu Troopers, Mitsu Monteros, and believe it or not, Jeep Cherokees, Comanchees, and others. The Jeeps have 23-spline output shafts, where the Toyota version apparently has 26 splines. The Jeep's version of this transmission is called AW4. There currently isn't an Atlas II or Klune V transfer case that can easily bolt up to the 4Runner or Taco A340F yet. But Marlin at www.marlincrawler.com does now make a couple of adapters for crawler boxes behind the 4Runner and Taco A340F. It may or may not fit the Tundra's A340F. I'm totally unfamiliar with your transfer case. But if someone here is looking for crawler gears or a dual transfer case, contact Marlin. It might work.

Sorry for the brain dump. I hope it'll help someone here.

Have any of you had problems with your auto tranny? Do you happen to know what the gear ratios are? Does anyone know any details or experience on how yours compares to the 4Runner or Taco version of this tranny? Do you know how the 4x4 transfer case compares?

Thanks a lot for any info!

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Jeff
2000 4Runner SR5, TRD supercharger, SAW coil-overs and OME springs for 2.5" lift, 285/75R16 MT/R's, custom front and rear bumpers, rocksliders

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Posts: 5 | From: Arvada, CO | Registered: Feb 2002 | IP: Logged