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Old 03-29-2017, 12:52 PM   #1
phuz
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Default 940 Rear (LSD) options

I recently posted about finding an LSD diff for a 240 I was going to get. Plans changed and I am now picking up a 940 (1991). I'm aware some of these came with a G80 locker, and while it's better than open, it won't suffice for the torque I'll be twisting through it.

So...again...what are my options here? I'd love an assembly that would just bolt-in, but if I have to get custom, so be it. Tall ratio is still a must. That 4.88 setup in the other thread would be extremely useless in my configuration.
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Old 03-29-2017, 12:54 PM   #2
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what are you planning on doing with the car? there's a dana 30 lsd that you can buy in terms of that.
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Old 03-29-2017, 01:06 PM   #3
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what are you planning on doing with the car? there's a dana 30 lsd that you can buy in terms of that.
It will see the dragstrip a couple times, but mostly be driven on the street with the occasional highway romping. About 500-550 ftlbs torque at the wheels.
My 2JZ / CD009 will be getting swapped in.
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Old 03-29-2017, 01:13 PM   #4
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http://forums.turbobricks.com/showthread.php?t=330724
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Old 03-29-2017, 01:13 PM   #5
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eh. g80 is fine with that, just not really consistent enough usually. as far as final drive ratios, they go as high a 3.31 if you shop it out a little.
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Old 03-29-2017, 01:46 PM   #6
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eh. g80 is fine with that, just not really consistent enough usually. as far as final drive ratios, they go as high a 3.31 if you shop it out a little.
Consistency is fairly important. So I take it no bolt-up assemblies to use? I see the Eaton Truetrac is favored by some, and saw a few links that people say "may" fit. I've never done any diff work, but as an engineer, I'm not afraid to dig into anything.
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Old 03-29-2017, 01:55 PM   #7
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trutrac fits. you won't have much luck digging up just a ring and pinion, so you'll be picking up a whole different axle assembly
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Old 03-29-2017, 01:58 PM   #8
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trutrac fits. you won't have much luck digging up just a ring and pinion, so you'll be picking up a whole different axle assembly
But people are just putting the truetrac in the stock housing without any issues?
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Old 03-29-2017, 02:57 PM   #9
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yeah
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Old 03-31-2017, 03:21 AM   #10
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eh. g80 is fine with that, just not really consistent enough usually. as far as final drive ratios, they go as high a 3.31 if you shop it out a little.
3.15 in Turbodiesel AW-55 3-speed auto '83 760, but pretty rare.
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Old 03-31-2017, 06:50 AM   #11
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OP, where are you located? I've got a 1041 rear end housing with 3.31 installed..... just getting ready to disassemble, but you should save yourself a lot of work and buy one factory fitted, then fit the TrueTrac. Case spreaders are recommended by the factory to open it .006" to properly preload your carrier bearings. Regardless, if the 3.31 is what you are after, you must find a factory 5 speed donor.
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Old 04-14-2017, 06:46 AM   #12
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I'm in southeast PA.

So a 5-speed rear is what I'm after? What kind of power levels can the housing and axles handle, safely?
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Old 04-14-2017, 08:40 AM   #13
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WELL, my 3.31 R&P has been purchased, and the housing will soon be headed to China/Korea. Do some research..... the Dana 30 will take some fairly high torque levels (these are listed in the Greenbook). In my experience it depends on your intentions..... auto cars won't shock those rear internals like the gear-bangin' stick shifts will. I can tell you that the axles have good size, and the spline count is similar to many V8 cars. The R&P bolt circle likewise has good size (1031 and 1041.... not the 1030). So the fuses are likely the (1) pinion area crush sleeve/bearings and (2) the LSD. Lots of users of the TrueTrac from Eaton.... I've not heard of anyone breaking one yet. See what the JEEP guys are doing to shore up their pinion bearings/crush sleeve and you should be able to put down some power.

Suggest you speak further with the drag guys here on their experience.... BABBs and LINUXMAN. They've likely broken all these parts and can give you more suggestions.
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Old 04-14-2017, 10:14 AM   #14
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I'm with ^^^^ about the TruTrac. Drop-in, actually designed for our diff's if you get the 912A588. Don't need a spreader, you can figure out the pre-load without it without much trouble. I've done it both ways with no issues. Got a 1041 in mine now with a TT, going on around 80k on it with a daily diet of 275ft.lbs at the ground, hasn't batted an eye, but I know there's many others with far more going thru them.
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