2G Quaife LSD Install Questions

DashLaflash · Oct 10, 2009

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.

bling5tatus · May 15, 2016

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.

pauleyman · May 15, 2016

What year fwd? 90-92 and 93 up are different. Axles are larger on 93.

90laserRSfwd · May 15, 2016

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.

bling5tatus · May 15, 2016

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!

pauleyman · May 15, 2016

awd half shafts are similar to fwd 90-92 units. check your part number. I think you have the 93 up front diff.

twicks69 · May 16, 2016

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.

90laserRSfwd · May 16, 2016

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.

twicks69 · May 16, 2016

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.

bling5tatus · May 26, 2016

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.

twicks69 · May 26, 2016

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

bling5tatus · Sep 8, 2016

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.

twicks69 · Sep 9, 2016

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.

fastersteve · Oct 29, 2017

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!

JASON4G63 · Jan 10, 2022

DashLaflash said:
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?

twicks69 · Jan 10, 2022

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.

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