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Old 06-28-2008, 04:05 PM   #1 (permalink)
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Tacoma 2wd limited slip... do they exist?

My daily driver 2001 Toyota Tacoma 2wd is in need of a limited slip for the rear end. It's got the standard Toyota 7.5" rear end (5 lug axle), but I'm having a hell of a time finding a limited slip for this application. The various sites (4wpw, Randy's, Drivetrain Warehouse etc) I've searched have part numbers for the front 7.5" diff in the 4x4 models, but they're always specifically listed "for front axle use only". Does anyone make a limited slip specifically for the rear end in 2wd Toyotas? Am I blind and simply missing some commonly available option for all of the thousands of 2wd Tacos running around out there?

I'm not interested in a full locking diff, just a limited slip like a Tru-Trac, since I need to maintain the road manners in this truck. I'm quite familiar with the lockers' quirks in my 85 4Runner 'wheeler, and I don't want that in my DD.
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Old 06-28-2008, 08:42 PM   #2 (permalink)
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Why would you want to have a limited slip in a 2wd pick up... totally worthless.
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Old 06-28-2008, 10:27 PM   #3 (permalink)
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Why would you want to have a limited slip in a 2wd pick up... totally worthless.
Thanks for the totally worthless reply . I want the limited slip for snow and logging roads. That ought to be enough reason. Coming from a fully locked 4x4, I feel a bit undergunned with a totally open 2wd.
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Old 07-01-2008, 10:30 AM   #4 (permalink)
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Why would you want to have a limited slip in a 2wd pick up... totally worthless.
Jesus, what a jackass. Youve only got over 100,000 less on you member # and hes trying to punk somebody in the noob section

I dont think they make one, but I would sell you a whole 8.4" rear end, the 6-lug stuff for the front end, and 6-lug wheels for like $500 You pay shipping
The Prerunners have the same 8" TRD like the 4WD TRDs do.

Look for some used stuff near you on here or just weld yours up It cant cost that much to wear out street tires
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Old 07-01-2008, 10:50 AM   #5 (permalink)
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as stated there aren't many options for the 5 lug axles. i'd try to find a complete 6 lug housing with an electric locker. then install inchworms cable activator and be done with it.
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Old 07-02-2008, 07:51 PM   #6 (permalink)
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I dont think they make one, but I would sell you a whole 8.4" rear end, the 6-lug stuff for the front end, and 6-lug wheels for like $500 You pay shipping
The Prerunners have the same 8" TRD like the 4WD TRDs do.
I've certainly mulled over the idea of switching to 6-lug, but I'm not aware of an easy solution for converting the front end to 6-lug stuff, short of redrilling the hubs and rotors. I'd really rather not have to spend the extra money to go six-lug (as you said, new axle, wheels, do something to the front end).

I ended up talking to 4wpw's Toyota guy, and he thinks they have a True-Trac part number that will fit. I've ordered one up, and we'll see if I have any luck installing it. If not that doesn't work, I'm probably SOL.
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Old 07-03-2008, 11:38 AM   #7 (permalink)
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Its hard to imagine any axle out there that doesn't have an enhanced traction diff available for it from the factory, much less aftermarket. I'm not familiar with Toy axles though. I think you should call them and talk to them in person. Its probably something simple why it doesn't appear they have what you want. Btw, if I had a 2WD, I would definitely want posi/limited in it at the least. Smart move.
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Old 07-11-2008, 04:48 PM   #8 (permalink)
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Find an axle out of a 05 and up X-runner. They come with a factory LSD
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Old 07-15-2008, 09:26 PM   #9 (permalink)
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How about a little tech to finish off this thread? Here's the story:

I finally got my True Trac installed in my 2001 2wd 4 cylinder Tacoma after a little bit of a headache.

The True Trac that I ordered, model number 911A565, is listed for use in a Toyota 7.5" rear end, according to 4 wheel Parts Wholesalers and Randy's Ring and Pinion. What I didn't know ahead of time was that Toyota 7.5" rear ends come in two flavors, one with ~45mm (actually 45.23mm or 1.781") diameter carrier bearing journals, and one with ~50mm (50.0mm or 1.969") carrier bearing journals. My 2wd Tacoma with the 2RZ-FE (2.4L) 4 cylinder motor (5-lug axles) had the smaller ~45mm carrier bearing journals.


The True Trac that I received, the only model listed for use in a 7.5" rear end, had the 50mm carrier bearing journals. So my stock carrier bearings from my Tacoma wouldn't fit on the new True Trac.


A quick aside: Anyone who has purchased a replacement carrier for the front end of an IFS Toyota 4x4 has probably run into this issue. It seems that the trucks/4runners (1986-95) equipped with 4 cylinder motors got the 7.5" front diff with 45mm bearing journals, while trucks/4runners (88-95) with the 3.0 V6 got 7.5" front diffs with the 50mm bearing journals. I don't know if this difference carried on into 7.5" front diffs of the 95.5-later 4x4 Tacoma, Tundra, Sequoia etc. I've only ever dealt with Toy 8" diffs up to this point, so this was news to me.

Now the trick is that the carrier bearings for the 45mm and 50mm carriers both have the same nominal outside diameter (the diameter of the cup for the carrier bearing), which is ~80mm (79.985mm OD for the 45mm ID bearings, and 80.0mm for the 50mm ID bearings, a difference of 1 one thousandth of an inch). Therefore, you can drop either of these bearings in the 7.5" 3rd member. It then just becomes a matter of getting the correct carrier bearings to fit on the 50mm bearing journals of the True Trac.

Some part numbers:

1. Stock carrier bearing for a 2000-2004 (probably also 1995.5-2000) 2wd, 4 cylinder Tacoma chassis codes RZN140 (regular cab) and RZN150 (Xtra-cab) (all use 5-lug axles):
Toyota PN 90368-45066, NSK PN 17887 (cone) and 17831 (cup). This bearing has a ~45mm inside diameter, and WILL NOT work on the TrueTrac PN 911A565. The dimensions of this bearing are 45.23mm ID, 79.985mm OD, and 19.482mm thickness.

2. Timken PN 32010X. This bearing has the 50mm inside diameter, 80mm outside diameter, and is 20mm thick. It drops into the 7.5" rear end 3rd member. This bearing is likely the same bearing used in the front 7.5" diffs of 1988-1995 V6 pickups and 4runners. This bearing may also be listed with an updated Timken part number: 32101X92AK1. It's the same bearing either way. This bearing WILL fit on the True Trac PN 911A565.




The stock carrier bearings for 2000-2004 V6 2wd Tacomas (Chassis code VZN150) and Tacoma PreRunners (chassis code RZN19# or VZN195) have a different part number (Toyota PN 90366-51001) than the 4-cylinder, 5-lug 2wd Tacoma (non-PreRunner, listed above) since these models all come with the 8" diff rather than the 7.5" diff (the 8" diff claim is based on the information provided in the 2003 factory service manual Appendix, pgs 297-300.) Therefore, they get to use one of the many available lockers and LSD's available for the Toyota 8" diff. What I don't know at this point is whether this carrier bearing has the same dimensions as the Timken part number 32010X shown above. It may share the same dimensions.

____________________________________

The upshot of all of this information is that I was able to order a pair of Timken 32010X bearings ($36 a piece through an industrial bearing supplier) to stick onto my True Trac PN 911A565. I was then able to bolt my factory 7.5" ring gear from my open carrier onto the True Trac, and drop the whole setup into my factory Tacoma 7.5" rear 3rd member.

The Timken bearings are wider than the factory 45mm ID carrier bearings, which means the carrier bearing preload and ring gear backlash need to be set up from scratch using a dial indicator and the procedure in the factory service manual, but it's a straight forward task since the pinion remains untouched and the gear pattern should be correct as long as you get the ring gear backlash set within factory settings (0.0051" to 0.0071").

You *may* also be able to use the Toyota PN 90366-51001 from the V6 2wd and PreRunner Tacomas if you can't find a bearing supplier that can get the Timken bearing or a similar bearing from another manufacturer (NSK, Koyo etc). Again, I don't know for sure that the bearings from the V6 2wd Tacoma will work, but they may. Another option is to ask for carrier bearings for the front 7.5" diff from an IFS v6 4Runner or pickup. For instance, if you tell the parts counter person that you have a 1990 V6 4Runner, you should end up with the correct carrier bearings for use on the True Trac 911A565 in a 7.5" rear 3rd member.

Also be aware that these are not normally stocked-in-store items, so allow the parts supplier a day or two to ship the bearings to your local parts store. Expect to pay quite a bit more for carrier bearings from Toyota (~$50-70 per bearing).

Anyhow, that's my little writeup on what it took to get a LSD in my 2wd Tacoma. The street manners are excellent, the LSD is totally transparent in normal driving. However, I expect the truck to make it up the hill to our desert property much more easily now, and I don't feel quite so naked out on the dirt roads without my built 85 4runner.
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Old 07-16-2008, 12:18 PM   #10 (permalink)
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Glad it worked out for you, but wouldn't it have been easier to just get either a explorer 8.8 or a cherokee 8.25 or d44?
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Old 07-17-2008, 02:26 PM   #11 (permalink)
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Glad it worked out for you, but wouldn't it have been easier to just get either a explorer 8.8 or a cherokee 8.25 or d44?
I don't see how those would be easier? This way I kept everything stock except the LSD itself, and the different carrier bearings. No new wheels, no new brake setup, no futzing around with shocks or u-bolts or anything else. Swapping the entire axle would have been a giant headache compared to this minor job. Total cost worked out to just under $600 for the LSD and bearings and shipping and tax and gear oil, since I already had the tools and facilities to do the work myself.
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Old 09-27-2010, 01:30 PM   #12 (permalink)
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Hi. New to this board, and I realize this is an old post, but you couldn't have been more helpful, Luke. I've been trying for years to find a limited-slip for my 95 Tacoma 2wd, as it just slips and slides it's way around town all the time...just ridiculous. I feel lsd should be standard equipment on all 2wd trucks. This is just the info I needed, and I look forward to getting this installed. Thanks again, Tom
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Old 09-30-2010, 04:37 PM   #13 (permalink)
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Good info here. Somebody should move this to the Toyota section!!
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Old 09-30-2010, 06:19 PM   #14 (permalink)
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hell yeah dude it is. i bet this isnt in an faq. someone give this man an award or something for rippin the newbie section apart! haha
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Old 09-30-2010, 06:48 PM   #15 (permalink)
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Glad it worked out for you, but wouldn't it have been easier to just get either a explorer 8.8 or a cherokee 8.25 or d44?
Why the fuck would you put a POS rearend in place of a puff 7.5" yota rearend?
-driveshaft flange
-custom parking brake cable
-brake plumbing
-different width
-shitty quality and construction
-nonremovable center diff

Yeah, totally better way of keeping the same bolt pattern

Sweet tech, another vote for a sticky in the FAQ. Along with my 2wd solid axle swap
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Old 11-22-2010, 12:58 PM   #16 (permalink)
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Hey,

Great post. looking for the same solution for a 1988 2wd pickup w/ a 22RE ... will your part numbers / solution for me as well?

thanks, again!
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Old 11-22-2010, 05:25 PM   #17 (permalink)
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I run a Toy 8.4" with 5 lug 2WD shafts in the back of a Jeep. Why not piece together a stronger rear and keep it the width and pattern you want?
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Old 11-23-2010, 11:08 AM   #18 (permalink)
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Just a quick question ....do the tundras and sequioas use the 7.5 diff up front ? It seems a bit small for a full-size with v8 power
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Old 11-16-2011, 02:23 PM   #19 (permalink)
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Bump for some updated tech to an old thread. tru trac 911a445 comes with the smaller 45 journals. its application is 86-95 7.5 4 cyl ifs fronts.

I recieved it instead of the 50mm for the front of my tacoma.
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