MX72 Rear End Solutions Think Tank

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MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Mon Aug 26, 2013 4:11 pm

Ok I am doing some research on diff/suspension options to those of us with Wagons and I'd like to use this thread to discuss possibilities with you guys.

Diff:
Our axle code is F292. F = 7.5" ring gear, 29 = 4.10 ratio, 2 = 2 pinion open diff.
I was looking around online at Truck stuff with 7.5" diffs and I found this link
http://www.drivetrainshop.com/Toyota_7_5_s/120.htm
Specifically I was eyeing the Detroit Eaton Torsen LSD's. I'm not sure what size axles us Cressida guys use, but it could possibly be a solution?

Suspension:
It is my understanding that for suspension we can use the same stuff early Celica guys use. This is what was recommended to me:
Volvo 240 rear sprin adjustible perches for 5" springs
http://yhst-26451710505916.stores.yahoo.net/240readsppek.html

Maybe these springs or get some custom units made
http://www.southwestspeed.com/?sec=view_menu&cat=Suspension&sub=Springs&ssub=Conventional%20Springs

And the tried and true Camaro rear shocks should be fine as a short stroke setup.
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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Mon Aug 26, 2013 8:16 pm

Also I'm being told that the LSD from an MA60 (the internals, not the actual housing obviously) should bolt in, since their diff code is F283 it should fit. Anybody tried this?
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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Tue Aug 27, 2013 2:15 pm

More diff info. This is all according to the info I have access to (I work in the Parts Dept at a Toyota dealership). I have not looked at my plate, I'll do that this evening.
X73 LSD = F303 (7.5" ring gear, 3.727 ratio, 2 pinion LSD)
X73 open = F302 (7.5" ring gear, 3.727 ratio, 2 pinion open)
X72 = F292 (7.5" ring gear, 4.1 ratio, 2 pinion open)
A60 open = F302 (7.5" ring gear, 3.727 ratio, 2 pinion open)
A60 LSD = EITHER:
F303 (8/81-8/84, 7.5" ring gear, 3.727 ratio, 2 pinion LSD)
F283 (8/83-12/85, 7.5" ring gear, 2 pinion LSD)

Still not sure if any of these will be plug and play, but I'll give it a shot and post back.
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Re: MX72 Rear End Solutions Think Tank

Post by kamesama980 on Wed Aug 28, 2013 12:24 pm

Didn't we have a conversation on toyotanation about this and it ended up being E292 not F292?
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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Wed Aug 28, 2013 2:02 pm

Yep. Forgot to update this thread. Looks like the final solution is: there isn't one. Bwomp bwomp bwoooooomp
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Re: MX72 Rear End Solutions Think Tank

Post by OkieRA29 on Thu Aug 29, 2013 5:47 pm

Well, there are many final solutions, but they all involve fabrication and welding. The 1st gen Supra diffs work great, but are expensive. You can get a Toyota truck diff, either in 7.5(F) or 8.0(G) and pre-85(sept 84 or older). You can have the axle tubes shortened(not really needed as they are only about an inch wider) and the mounts welded on. Then new axles and you are back in business. You can also try the Ford 8.8 rear end as well. These were usually found under Fox Body Mustangs and will have the benefit of disc brakes as well. Again though, you may need to shorten the tubes, get new axles and of course have the mounts welded on. Most of these axles will also mean new driveshafts as the diffs are definitely longer than the stock MX72

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Re: MX72 Rear End Solutions Think Tank

Post by cmdeshon on Sun Sep 01, 2013 7:35 am

pretty much all you can do to the E series diff is weld it.

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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Wed Apr 09, 2014 10:22 pm

OkieRA29 wrote:Well, there are many final solutions, but they all involve fabrication and welding.  The 1st gen Supra diffs work great, but are expensive.  You can get a Toyota truck diff, either in 7.5(F) or 8.0(G) and pre-85(sept 84 or older).  You can have the axle tubes shortened(not really needed as they are only about an inch wider) and the mounts welded on.  Then new axles and you are back in business.  You can also try the Ford 8.8 rear end as well.  These were usually found under Fox Body Mustangs and will have the benefit of disc brakes as well.  Again though, you may need to shorten the tubes, get new axles and of course have the mounts welded on.  Most of these axles will also mean new driveshafts as the diffs are definitely longer than the stock MX72

Is the Mk1 Celica-Supra rear end a completely bolt-in affair? I've heard tales that it is, I just want to be sure.
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Re: MX72 Rear End Solutions Think Tank

Post by cmdeshon on Thu Apr 10, 2014 6:20 am

Yes, even down to the disc breaks. it is a direct PnP bolt on swap. however, it is a rather expensive axle because lots of people want them.

if your not going to run big power than its a great way to go. if you are going to run big power than you will need some fabrication to put in a bigger one.

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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Thu Apr 10, 2014 8:28 am

Yeah I'm picking one up this weekend, I just wanted to make sure everything will work, especially with my driveshaft (custom 1 piece).
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Re: MX72 Rear End Solutions Think Tank

Post by Gordon Duax on Fri Apr 11, 2014 3:08 pm

The IS200 Torsen is also an option, and cost less than the Eaton.
But if I were to ever do an X7, I would either just run down one of these X7 8" LSDs, since all 8" gear sets (a large selection available), and aftermarket LSDs will fit:



Or.....
Just buy an 8" out of the likes of a MkIII Supra, or IS300, and modify the subframe pieces to mount it.
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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Fri Apr 11, 2014 7:38 pm

This thread is for MX72. Wagons. Solid rear axle
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Re: MX72 Rear End Solutions Think Tank

Post by Gordon Duax on Fri Apr 11, 2014 8:27 pm

Never mind......

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Re: MX72 Rear End Solutions Think Tank

Post by MR2_FTW on Fri Jul 18, 2014 1:56 pm

Here's a list of X72 rear end part numbers if anyone needs them

Diff oil drain/fill gasket (x2) 12157-10010
3rd member gasket 42181-30010
Diff bearings (x2) 90368-45066-77
Pinion nut 90179-18001
Pinion oil seal 90311-38047
Front pinion bearing 90366-30078-77
Rear pinion bearing 90366-35064
Pinion crush spacer (might wanna get a few of these, they are one time use and if you screw it up you need another one) 41231-22020
Spider gear washers (x2) 41351-30032
Spider gear (x2) 41341-30011
Side gear kit (SHOULD include left and right) 41039-28010

Side gear spacer washers (x2):
These come in different thicknesses (in mm)
0.95 41361-22140
1.00 41361-22020
1.05 41361-22150
1.10 41361-22030
1.15 41361-22160
1.20 41361-22040


Axle bearings (x2) 04421-30012
Axle oil seals (x2) 90311-52059
Axle bearing retainer gasket (x2) 42425-14020
Axle housing end gasket (x2) 42185-14020


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