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Old 01-02-2019, 04:33 AM   #1
jillyboi940
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Default 740 Open Diff into 940 G80

Does anyone know what it would take to swap an open diff from a 740 into a G80-equipped 940? I'm not a big fan of the locking and unlocking of the G80, so I was thinking on how to go about changing that. The only problem I can foresee with that is that I can't find any 740s where I live to grab the rear axle out of. Any other suggestions are fine.
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Old 01-02-2019, 04:44 AM   #2
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What about the locking don't you like? In stock form it only works below something like 20mph. But the easiest would be to lust take the spring out of the mechanism with the flyweight that disables the locking/unlocking function above a certain speed. That way, it'll always be open. Or just take that whole mechanism out, it'll be open too then.
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Old 01-03-2019, 04:37 AM   #3
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I'm a dirty skid kid and I want consistency

In all seriousness though, that doesn't sound like a bad idea. I'll probably end up welding it while I have it out. Thanks!
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Old 01-03-2019, 12:34 PM   #4
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I still don't understand????? What's the point of this exercise?
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Old 01-03-2019, 12:48 PM   #5
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The only issue that I see is if you get a diff from a 740, it will not have the correct tone ring. I guess you can reuse the tone ring from your 940s diff. I have an open diff available, send pm if interested.
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Old 01-03-2019, 12:52 PM   #6
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I still don't understand????? What's the point of this exercise?
All the doriftos!

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The only issue that I see is if you get a diff from a 740, it will not have the correct tone ring. I guess you can reuse the tone ring from your 940s diff. I have an open diff available, send pm if interested.


Buy his swag.
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Old 01-03-2019, 03:40 PM   #7
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All the doriftos!





Buy his swag.
One tire fire does not impress the chiquitas, get skinnier tires or a more powerful car.
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Old 01-03-2019, 05:29 PM   #8
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I still don't understand????? What's the point of this exercise?
The age old question.

I can't understand what could be the problem.
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Old 01-03-2019, 05:35 PM   #9
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Best bet would be to swap complete axle
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Old 01-03-2019, 05:53 PM   #10
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Best bet would be to swap complete axle
The best would be to seek medical help.
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Old 01-03-2019, 05:55 PM   #11
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One tire fire does not impress the chiquitas, get skinnier tires or a more powerful car.
Won't be a one tire fire if you weld it
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Old 01-03-2019, 05:58 PM   #12
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Best bet would be to swap complete axle
Not quite an option at the moment. There aren't any 740s to source one. Though, I could use a 240 axle, couldn't I?
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Old 01-03-2019, 06:25 PM   #13
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Not quite an option at the moment. There aren't any 740s to source one. Though, I could use a 240 axle, couldn't I?
Lemme ask, do you know Churd? 240 axle won't fit. Once the locker is engaged they're not supposed unlock until you let off the gas. I'm pretty sure you can buy replacement clutch plates, why not fix it then do the governor mod so you get lsd action at any speed. The only way I could ever tell it was working was that I wasn't spinning one tire and the car was accelerating rapidly, why are you trying to make your crappy old car crappier?
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Old 01-03-2019, 07:27 PM   #14
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Lemme ask, do you know Churd? 240 axle won't fit. Once the locker is engaged they're not supposed unlock until you let off the gas. I'm pretty sure you can buy replacement clutch plates, why not fix it then do the governor mod so you get lsd action at any speed. The only way I could ever tell it was working was that I wasn't spinning one tire and the car was accelerating rapidly, why are you trying to make your crappy old car crappier?
Churd? No.

I don't like being in drift and wondering whether or not my diff is going to lock how I want it to. I've also heard that G80s aren't built to withstand abuse like that, so I thought it would be a good idea to find a replacement for when it gives out.
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Old 01-03-2019, 07:31 PM   #15
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Churd? No.

I don't like being in drift
These is simple devices that could help you obtain you goal.

This:


And this:



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Originally Posted by jillyboi940 View Post
and wondering whether or not my diff is going to lock how I want it to.
What is "how I want it to" ?

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I've also heard that G80s aren't built to withstand abuse like that
Where did you heard that?
Abuse like what?
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Old 01-04-2019, 12:34 AM   #16
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What is "how I want it to" ?
Where did you heard that?
Abuse like what?
Fully locked.
Some general searching around.
Burnouts, drifts, and things of that nature.
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Old 01-04-2019, 12:41 AM   #17
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I don't like being in drift
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drifts, and things of that nature.
I'm sorry but I'm lost here.
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Old 01-04-2019, 12:46 AM   #18
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Originally Posted by jillyboi940 View Post
I don't like being in drift and wondering whether or not my diff is going to lock how I want it to.
How is anyone having trouble understanding this?

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I'm sorry but I'm lost here.
Is this a French thing?

Trying to go drifting with a diff that locks up completely, maybe, if you apply some throttle but only below 20mph, but then you can go faster, and unlocks if you lift, sounds like a nightmare. I'll take an open diff over that on paper.

OP, have you tried it sideways yet to confirm it's actually that bad?

Last edited by rwb; 01-04-2019 at 12:54 AM..
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Old 01-04-2019, 12:49 AM   #19
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Is this a French thing?
I guess.

Let me ask this:

How does swaping a G80 for an open diff help drifting?
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Old 01-04-2019, 01:06 AM   #20
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see edits^^

An open diff sounds better to me than the G80, as it's described, for this purpose. I'd want open or welded, one or the other, if I'm not buying some fancy LSD that engages very predictably.

I happily use an open diff for a car that's made for sliding, because I'm not confident that I could easily get a replacement if I welded it and it didn't work as well, and I'm not on pavement so frankly it's easier to go sideways. It's not that bad. Being on pavement it's probably worth jillyboi's time to weld it up if it's already coming out, but whatever, I've been lazy before. The first suggestion he got is probably the best one, I wouldn't have known you could just mod the G80.

If these cars were nice sports cars that came with a nice limited slip it would be a really weird question, sure, but, you know.
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Old 01-04-2019, 01:06 AM   #21
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Originally Posted by Vincent Gagnon View Post
I guess.

Let me ask this:

How does swaping a G80 for an open diff help drifting?
This, I agree with. That logic (?) makes no sense.
G80 is extremely unpredictable and failure prone, an open diff is just predictably terrible and disappointing for drifting.

Just booger weld something, call it good.
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Old 01-04-2019, 01:09 AM   #22
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OP, have you tried it sideways yet to confirm it's actually that bad?
Yes, I have and it's not very predictable at all.
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Old 01-04-2019, 01:10 AM   #23
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This, I agree with. That logic (?) makes no sense.
G80 is extremely unpredictable and failure prone, an open diff is just predictably terrible and disappointing for drifting.

Just booger weld something, call it good.
The point of swapping the open diff in is to weld it beforehand.
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Old 01-04-2019, 01:14 AM   #24
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The missing piece of the puzzle!

Last edited by rwb; 01-04-2019 at 01:19 AM.. Reason: The privilege of posting in all caps should only be revoked from those who abuse it. It is unfair that I cannot post in ALL C
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Old 01-04-2019, 01:15 AM   #25
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Originally Posted by jillyboi940 View Post
The point of swapping the open diff in is to weld it beforehand.
Ahhh. Send it.
Pro tip, weld it inside the housing with axles in the side gears. That will keep the side gears aligned and reduce the likelihood of broken axles. Also, welding the side gears to the case will usually result in cracked welds after a while, but it’ll save the diff pin from taking all the load.
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