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Toyota 8"
https://slantsix.org/forum/viewtopic.php?t=46041		 Page 1 of 2
Author:  Hiiamthomas@aim.com [ Mon Aug 22, 2011 12:40 am ]
Post subject:  Toyota 8"
79-85 Toyota 8". 55" wide, 29 inch perch spacing. 8" ring gear, non c-clip 27 spline axle shafts, 3rd member style. I've been into rock crawling and it's common to have 37 inch tall and 12.50 inch wide mud tires, locked, with dual transfer cases putting an awful amount torque through this axle, without breakages. There is a huge aftermarket for this axle as well. Not to mention ready for leaf springs already with possible perch relocation. 4.10 standard with 4.88s and 5.29s as upgrades. Many lockers available from spider gear replacement ratcheting lockers, detriot carrier replacement lockers and full spools and chromolly shafts Availble. Trail-gear.com. I don't see any issues so far with this behind a slant six. I've got an axle sitting around and do the swap and post up pictures. Any opinions? The 7.25 is 54.5 inches wide so the Toyota 8inch would only be .25 of an inch wider on each side. I know the 7.25 is fine for the slant six but the gears,lockers, after market parts available make this appealing.The greatest part about the 79-85 Toyota axles is people just give them away because they all want the 86-95 rear ends that are 4 inches wider. There are tons of them out there! With the ability to switch diffs before the track would be amazing, 4.10s on the road and 5:29s on the track. Driveline modifcation would be simple and the Toyota has drums so brakeline modification should be simple as well.
Author:  emsvitil [ Mon Aug 22, 2011 1:56 am ]
Post subject: 
The axles would have 6 lugs........


What about the 2wd toyota axles? (but I think they're 7.5)

I even think they're 5 x 4.5" too...


Will the 2wd axle fit in the 4wd housing?

Or what about the 1 ton toyota 2wd axles (8"?)
Author:  Hiiamthomas@aim.com [ Mon Aug 22, 2011 3:07 am ]
Post subject: 
Yes six lugs. I should have said I was looking at this axle as a budget swap for built/turbo slant motors on the drag strip. Dont know too much about the 2wd axles. But the aftermarket for Toyota 8inch is HUGE. and the axle is legendary for strength in it's size class. Think about the torque I'm putting on it from my 22r 2.4L 4cylinder with dual transfer cases behind that reducing the ratio 5:1 (overall ratio I had was 108:1 your ratio is determined by first gear in tranny 3.92:1 multiplied by transfer case reduction in low 2.28x2.28(dual cases) multiplied by ring and pinion which mine is 5.29) With 35 inch tires, locked diff, with tons of tire binding while in the rocks and no breakages?? Finding tires shouldn't be hard with 15 inch rims.
Author:  Dart270 [ Mon Aug 22, 2011 6:43 am ]
Post subject: 
This does look like a nice axle. I'd want to see if you can switch it to 5X4.5 bolt circle. Maybe the 7.5" axle would be fine too...

Lou
Author:  olafla [ Tue Aug 23, 2011 5:19 pm ]
Post subject: 
The Toyota diffs are known for their strength.

Here is a link to an overview and the data for the different Toyota diffs, including a wiring diagram for electrically actuated diff locks: 4x4.wire.com.

Here is a link to a decoder for the different Toyota rear axle codes: www.off-road.com.

Olaf.
Author:  Hiiamthomas@aim.com [ Tue Aug 23, 2011 8:04 pm ]
Post subject: 
I just checked today and the Toyota 2wd is still a 8inch ring gear, and it's 5 lug.

Im going to pull the shafts from a 2wd and put my axle under the dart.


ill post pictures ASAP
Author:  Joshie225 [ Tue Aug 23, 2011 9:51 pm ]
Post subject: 
Quote:
I just checked today and the Toyota 2wd is still a 8inch ring gear, and it's 5 lug.
I thought that was only true for the V6 trucks.
Author:  Hiiamthomas@aim.com [ Tue Aug 23, 2011 10:04 pm ]
Post subject: 
V6 is High Pinion and ribbed diff.
Author:  Dart270 [ Wed Aug 24, 2011 6:48 am ]
Post subject: 
Sweet! Keep us updated, please.

Lou
Author:  USAJon [ Wed Aug 24, 2011 7:56 am ]
Post subject: 
i've got an old sckool harley bro, who for the last 18 years has a toyota repair shop..he told me those rears are bullet proof. he's seen 500K on some pickup rears..
Author:  Joshie225 [ Wed Aug 24, 2011 9:12 am ]
Post subject: 
More research shows the 2WD pickups came with both F-code 7.5" and G-code 8" differentials. The V6 differential I was thinking of is an uprated 8".

I'd certainly want the 2WD axle assembly as it has the 5 on 4.5" wheel bolt pattern. There don't appear to be any factory limited slip carriers for the 8", but there are many aftermarket units to choose from. Also, the 8" shows to have 30 spline axles which is the same spline count as an 8 3/4. This is better than the 28 splines of the Ford 8" and passenger car 9". The big down side to the 8" Toyota axles is the gear ratios aren't appropriate for highway use without an overdrive. Not with the tires we can fit under an A-body at least! :)

There are many Toyota passenger cars which use the F-code 7.5" differential and factory limited slip differentials were available. I pulled a LSD 3rd member some years ago from a Cressida. The early Celica-Supra rear end is 7.5", has disc brakes and 5 on 4.5" wheel bolt pattern. I don't know how wide it is though.
Author:  Dart270 [ Wed Aug 24, 2011 11:30 am ]
Post subject: 
Thanks, guys. I would guess the 7.5" is tough enough for most Slants. I love the 3rd member axle design.

Lou
Author:  Hiiamthomas@aim.com [ Wed Aug 24, 2011 12:15 pm ]
Post subject: 
This axle is going to be Budget gold.
Author:  USAJon [ Wed Aug 24, 2011 2:43 pm ]
Post subject: 
you could redrill the axle..then have both patterns..
Author:  mcnoople [ Tue Mar 05, 2019 1:52 pm ]
Post subject:  Re: Toyota 8"
I would like to start with I know this is a thread necro, but it is on point.

I am curious if anyone ever finished this swap. I have been combing the internet trying to find specs on the perch spacing on the 79-95 2wd Toyota 8 inch axles with no luck. The reasons are simple comparable length, correct bolt pattern, aftermarket support including OEM electric lockers, very similar length, and availability. My goal would be to install it in a 65 valiant in place of the 7.25. It is 225 powered so it should be easily within the power handling of the rear.

I am just curious. My car has been in neglected storage since late 2007 due to a lack of anything resembling a workshop. That problem was solved a couple months back and I am wanting to start collecting parts to get it back together and on the round.

Sadly I did have an A-body 8.75 with spare diffs when the car was parked but most of my spare parts went away and all I have left is a carrier with 3.55 lsd. Not much good without the housing, axles, and brakes. I will likely just sell that on craigslist in the future after I get it back together.
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