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2G Quaife LSD Install Questions

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DashLaflash

15+ Year Contributor
311
7
Jul 4, 2007
Millbury, Massachusetts
Hey guys I bought a quaife LSD for my 1995 Eclipse GST that I am building, and I had a few questions about installing it. The transmission is already out of the car and taken apart. The vfaq got me most of the way through the install but I'm stumped on a couple things. I already have the speed sensor gear pressed onto the quaife and the final drive gear bolts torqued to spec. The thing I'm not sure on is how to press on the bearings and space them. Reading the vfaq it seemed like he put on a spacer and then pressed on a bearing. Your supposed to use a piece of solder on the bearing race and bolt on the case to check for play and add the spacer of correct size. (factory service manual) Now what I don't get is if you need a different spacer do you have to press off the bearing, use the correct spacer, and then press the bearing back on again. I don't have a press but i can get access to one. I will have to travel though to press bearings on and off. Also there was something that looked like a spacer on top of the outer bearing race (passenger side) just sitting on top of the race. This was on the stock differential and very thin. Is this the only spacer that I have to deal with. Sorry for the long post I just want to make sure I know what I'm doing.

Some other questions about the quaife:
1. What type of gear oil to use in my trans.? (I heard redline is good what kind to get)
2. Is there a break in procedure? (No because its not a clutch type LSD???)
3. I already tried to order spacers from mitsubishi but I was unsure what I actually needed. I got a spacer set part #MR954819. Think these go inside the actual stock differential though not bearing spacers. Do I have the right part?

Well I did some more reading of the Factory Service Manual and I placed the quaife in the tranny without the bearings on it. I seems like after pressing the bearings on without spacers things will line up. The FSM only mentions a spacer on top of the passenger side bearing race (not between the bearing and the diff.)to take up any play between the differnential and the transmission case. A spacer between the bearing on the speed sensor side of the diff would increase how the final drive gear lines up. The vfaq definately says he uses one inbetween the bearing but the FSM makes no mention. Since no one has replied yet I'm going to try to get my bearings pressed on without spacers and go from there. Anyone that can help and give me a definate answer please chime in.
 
Last edited by a moderator:
Sorry to bump an old thread but this seems to be where the most info on quaife diffs is.

I have a qdh8b and a f5m33 fwd transmission. The bearings that "go to my transmission" are too big to be pressed onto the quaife. It looks like the picture that someone posted on page one and they fixed the issue by using custom bearings from shep. I haven't removed my axles or transmission from my car yet so I may find that my axles won't even fit this diff. I'll sell it if that's the case.... but I'm wondering if I should have bought the qdh7b instead. If anyone can offer some insight that would be appreciated.
 
Can someone (Tim, whoever), confirm a conflict I have (and others I'm sure). I'm using a 1g awd trans (going into my 1g fwd car). Both turbo 5 speeds. I am confused about the diff welding and quaife FRONT lsd use. What exactly needs to be done in this situation? Trans (the awd I want to use) is code NPXV. (I assume awd 91 - 92). I'd like to have the trans rebuilt, use a Quaife LSD, and have the equal length half shalves. I am shooting for more power then a fwd turbo trans will hold. Please and thank you! I've searched awd trans in a fwd and halve an idea how it works, but the LSD adds another confusing part LOL. In lay men's terms: I want my fwd car to have an LSD and equal length half shalves and have the power handling of the awd case / gears.
 
I'm not sure what your question is exactly. It sounds to me like you're not sure if you should weld the stock diff or use a quaife. If that is your question then it's really just a cost thing because the quaife is going to be considerably more expensive (obviously). If the cost is not an option then I would not consider welding the center diff. It ruins tires if you use your car as a street car and it will handle like crap on the highway in long sweeping corners. I think others will confirm this if they've used one before (i have not). I hope that helps and if that wasn't your question please clarify what you're asking.

Pauleyman - I will find the full code on the stamped plate.... I'll also get it removed within the next day or two and confirm if the axles I have in my car will fit the diff I've got. If not I may be taking a small hit on the diff trying to sell it to someone else..... or I may have to find a way to use a transmission that will work with this diff if that's possible.

Thank you for trying to help btw!
 
QDH8B is an AWD 25-spline front diff. QDH7B is a FWD 27-spline front diff.

Use MD706566 for the AWD front diff bearings (6207 deep groove C4 roller bearings)
Use MD710663 tapered roller bearings for the FWD front diff.
Use MD717879 for the speedo gear.
 
My question is: what quaife part number do I need to order for the Front diff in an AWD trans?

I'm trying to use an AWD transmission in FWD car. I want the Quaife LSD but I read you need to have the center diff welded in an awd trans to use it in a fwd car.

Hopefully that clarifies. Sorry I'm not good at trying to explain myself threw text. I want the LSD and the equal length half shafts. I need the strength of the awd case / gears for my power level.

According to Tim's post above (thank you), I need part number QDH8B. I'm still confused as to whether or not the CENTER diff needs welded.
 
Yes, you need the center differential welded, remove the viscous coupler and output shaft, and install a 45mm freeze plug in the bell housing then seal it up.
 
So I have removed the axles on my car and confirmed that they do fit the AWD Quaife QDH8B.... so I have the early 1g FWD trans w/ small axles.

I was told by a friend to "upgrade to the needle bearings" that allow me to set preload with shims on the diff. My understanding, now, is that there is only one type of bearing that fits the small axle diff and that's the normal ball bearings. Is that correct or is there a needle bearing/shim setup that will work in a 90-91.5 FWD (small axle) trans?

Thank you for the help so far..... I'm real close to not being another one tire fire car on the road.
 
You will shim for 0.003"-0.007" end play, they are standard roller bearings. the bearings are plenty strong. you should be also using MD707184 black axle seals on both sides
 
Just to clarify, if you have a 1G FWD you may not want to blindly order the FWD Quaife. If I had done this I would need to change who knows what else other than axles. My FWD transmission is not a "large axle" FWD so the AWD Quaife part number was needed to install in my transmission. This will also prevent you from using the "stock" bearings that fit your transmission as they will present you with the problem in the pictures posted earlier in this thread (bearing race way too large for the spot on the diff where it's supposed to mount).

I'm glad I did my research first rather than assuming that the FWD unit would just fit my transmission because it's a FWD.
 
Well yeah, you have 25-spline axles; you would need to use MD707184 black axle seals on both sides with stock axles and a Quaife QDH8B 25-spline AWD differential and then swap over to the MD706566 bearings (AWD roller bearings), which is also known as a 6207 deep groove roller bearing. If you are changing over to AWD axles, then you would have to modify your bellhousing to accept the AWD halfshaft and MD719710 axle seal on the driver side and MD707184 on the passenger side.

The Quaife QDH7B is a 27-spline axle for late model DSM 27-spline FWD axles only in conjunction with MD742053 brown axle seals and MD710663 tapered roller bearings.
 
Since this seems to be the source for all things Quaife...

I have an F5M22 out of a 95 Mirage. Will the QDH7B fit this transaxle? I know I will need the speedo ring, will I need special bearings or will stock replacements work?

Thanks for helping out a newbie!
 
Hey guys I bought a quaife LSD for my 1995 Eclipse GST that I am building, and I had a few questions about installing it. The transmission is already out of the car and taken apart. The vfaq got me most of the way through the install but I'm stumped on a couple things. I already have the speed sensor gear pressed onto the quaife and the final drive gear bolts torqued to spec. The thing I'm not sure on is how to press on the bearings and space them. Reading the vfaq it seemed like he put on a spacer and then pressed on a bearing. Your supposed to use a piece of solder on the bearing race and bolt on the case to check for play and add the spacer of correct size. (factory service manual) Now what I don't get is if you need a different spacer do you have to press off the bearing, use the correct spacer, and then press the bearing back on again. I don't have a press but i can get access to one. I will have to travel though to press bearings on and off. Also there was something that looked like a spacer on top of the outer bearing race (passenger side) just sitting on top of the race. This was on the stock differential and very thin. Is this the only spacer that I have to deal with. Sorry for the long post I just want to make sure I know what I'm doing.

Some other questions about the quaife:
1. What type of gear oil to use in my trans.? (I heard redline is good what kind to get)
2. Is there a break in procedure? (No because its not a clutch type LSD???)
3. I already tried to order spacers from mitsubishi but I was unsure what I actually needed. I got a spacer set part #MR954819. Think these go inside the actual stock differential though not bearing spacers. Do I have the right part?

Well I did some more reading of the Factory Service Manual and I placed the quaife in the tranny without the bearings on it. I seems like after pressing the bearings on without spacers things will line up. The FSM only mentions a spacer on top of the passenger side bearing race (not between the bearing and the diff.)to take up any play between the differnential and the transmission case. A spacer between the bearing on the speed sensor side of the diff would increase how the final drive gear lines up. The vfaq definately says he uses one inbetween the bearing but the FSM makes no mention. Since no one has replied yet I'm going to try to get my bearings pressed on without spacers and go from there. Anyone that can help and give me a definate answer please chime in.
I'm installing a quaife as well but can't find torque specs for the ring gear?? Do you know oem torque specs?
 
70-75ft/lb with loctite 242 is plenty. I typically use my Milwaukee fuel 3/8" impact with a 6 point short 19mm socket and do finger tight all fasteners and then star pattern two times around.

3 ugga duggas if you are in Australia. ;)
 
Alright I'm bringing this thread back from the dead. I'm installing a Quaife QDH7B into my 93 fwd trans (27 spline). I ordered 2 MD710663 bearings but they're too big. They drop right over the shaft. Am I using the incorrect bearing/combo here?

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Well that is odd, MD710663 is the correct bearing for QDH7B Quaife LSD diffs for a 27 spline setup. Measure the OD of posts on the Quaife in mm. MB393957 and MN168441 (Koyo HR30207J = 35mm ID, 72mm OD, 18.25mm height) are the tapered roller bearings normally used for the early FWD DSM 5-speed transmissions using a 25 spline QDH8B; it could easily be an old diff that used 35mm bore bearings.

Also confirm your 27 spline axles fit.
 
Well that is odd, MD710663 is the correct bearing for QDH7B Quaife LSD diffs for a 27 spline setup. Measure the OD of posts on the Quaife in mm. MB393957 and MN168441 (Koyo HR30207J = 35mm ID, 72mm OD, 18.25mm height) are the tapered roller bearings normally used for the early FWD DSM 5-speed transmissions using a 25 spline QDH8B; it could easily be an old diff that used 35mm bore bearings.

Also confirm your 27 spline axles fit.
Here's what I got measuring the post on the Quaife. I had trouble finding what the ID of the awd bearing is supposed to be. You think someone could have swapped the end caps on it to use the 27 splines axles in an early 90-92 transmission?

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The 7 is for Autos and 8 is manuals. What what is your 1g using? I run a 7 in my auto. Only thing i dont know is bearings. I thought awd auto still uses balls vs taper on the fwd. But its been a while since i did this research and read up on it
 
The 7 is for Autos and 8 is manuals. What what is your 1g using? I run a 7 in my auto. Only thing i dont know is bearings. I thought awd auto still uses balls vs taper on the fwd. But its been a while since i did this research and read up on it
My transmission is manual. I don't see anything on Quaifes site stating the QDH7B is for an auto though.
 
My transmission is manual. I don't see anything on Quaifes site stating the QDH7B is for an auto though.
Thats what the 27 splines for. The 8 is 25 spline so manual trans. Maybe just maybe this is the issue all along.
 
Thats what the 27 splines for. The 8 is 25 spline so manual trans. Maybe just maybe this is the issue all along.
I don't think that's right. My stock diff I removed is 27 spline and my axles are as well. It was my understanding that all 93-99 FWD turbo transmissions are 27 splines.
 
This where im out of the memory as its 1G. I read those but not to the fullest since at the time it was for my 2G. so my written replies are solely based on that. i was not fully aware of 2 versions for the 1G chassis.

His diff is also NEWER as mine is 6 digits vs the OP's 7 digits.. mine was back in 2020
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ALL i can suggest is measure your OLD diff bearing OD vs the NEW diff and see if they match, if not then its possible its machined wrong for the bearing or they did it for the AWD bearing if its bigger by mistake.

anyway i think my replys to this a pretty null void at this point so im gonna take an exit LOL
 
The Quaife QDH8B is 25 spline and used in all DSM AWD 5-speed and auto applications with a black axle seal, along with early 1990-1992.6 1G FWD 5-speed and auto transmissions using BLACK axle seals. The OD of the bores are 35mm for use with MB393957 and MN168441 (Koyo HR30207J = 35mm ID, 72mm OD, 18.25mm height) tapered roller bearings for FWD applications. For AWD applications it utilizes a 6207 bearing; I typically use a 6207-2RS-C3 roller bearing that is shielded. -- technical drawing of QDH8B - https://shop.quaife.co.uk/wp-content/uploads/2014/03/QDH8B.pdf

The Quaife QDH7B is 27 spline and is used in all BROWN axle seal applications, including 93-99 FWD 5-speeds and 1992.7-1999 FWD auto applications. It should be using 2x MD710663 bearings, which are Koyo LM501349-N / 57428-N with a dimension of 41.25mm ID / 72mm OD. Technical drawing of QDH7B - https://shop.quaife.co.uk/wp-content/uploads/2014/03/QDH7B.pdf

There are a couple applications that use a unique bearing race with the QDH7B, such as the 1990-1994 3000gt FWD auto which has a 74mm OD bearing race on the ring gear side and uses MD740761 on that side with a MD710663 bearing on the bellhousing side of the case with the 72mm OD bearing race. The 1995-1999 3000GT FWD auto uses MD710663 on both sides.

----------------------------
@LarryJoe
In this case, it looks like Quaife screwed the pooch on its bearing bore; are both sides 40mm OD?
There is a bearing that is 40mm ID / 72mm OD but it is not 18.25mm height; it is 19.0mm height which will cause issues due to the 0.75mm offset per side creating a 0.030" setup height difference where it contacts the pinion gear, but also a 0.060" difference total height that would have to be adjusted by machining the case to take the addittional space as the factory shim is typically in the 0.029-0.036" range.
In this case I would reach out and contact Quaife directly. Their technical drawing shows the proper dimension. If you are seeing 40mm posts that means that they assembled your differential wrong. https://shop.quaife.co.uk/wp-content/uploads/2014/03/QDH7B.pdf
 
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