sl320 diff??? Will it work?
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Super Member
Joined: Oct 2007
Posts: 516
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From: NEW YORK
04 E500 20in brabus monoblocks 1 serious 500E & 91 300CE 2JZ 2005 CL65
sl320 diff??? Will it work?
I m looking to use a 1994 sl320 differential in my 1991 300ce. has anyone tried this before? i want to know if the axels bolt up and driveshaft??? the 300ce diff is a 3.07 ratio and the sl320 is a 3.69. i need to get as close to 3.73 as possible. thank you!!!
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Joined: Oct 2008
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From: seattle
1990 300ce supercharged and intercooled
It should work. You might have to swap the axles or the flanges in the diff to match yours. The sl should have a #129 case in it as your 300ce does. They maybe slightly different #129 350 -- -- numbers but that is from updates. The main differences would be if it is asr or not. If it is an asr case then you definitely need the axles from the sl also.
Thread Starter
Super Member
Joined: Oct 2007
Posts: 516
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From: NEW YORK
04 E500 20in brabus monoblocks 1 serious 500E & 91 300CE 2JZ 2005 CL65
how much hp do you think these diff's can hold???
It should work. You might have to swap the axles or the flanges in the diff to match yours. The sl should have a #129 case in it as your 300ce does. They maybe slightly different #129 350 -- -- numbers but that is from updates. The main differences would be if it is asr or not. If it is an asr case then you definitely need the axles from the sl also.
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Joined: Oct 2008
Posts: 837
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From: seattle
1990 300ce supercharged and intercooled
It depends on how much traction you have. The higher ratios like a 3.73 will not hold as much because the pinion is to small. The 2.73-3.06 is going to be much stronger. I have the 3.27 in mine right now but am switching to the 3.06 for running the quaife atb. I looked into shimming the ring gear but think that if I do not like the 3.06 then I will sell this setup and swap in a different rear end.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
Thread Starter
Super Member
Joined: Oct 2007
Posts: 516
Likes: 4
From: NEW YORK
04 E500 20in brabus monoblocks 1 serious 500E & 91 300CE 2JZ 2005 CL65
GOTCHA! i am doing a 2jz swap. I am looking for around 700 hp from my motor! So what your saying is to leave the 3.06 diff i have in there now cuz it will hold up more power than the higher ratio diffs???
It depends on how much traction you have. The higher ratios like a 3.73 will not hold as much because the pinion is to small. The 2.73-3.06 is going to be much stronger. I have the 3.27 in mine right now but am switching to the 3.06 for running the quaife atb. I looked into shimming the ring gear but think that if I do not like the 3.06 then I will sell this setup and swap in a different rear end.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
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Super Member
Joined: Oct 2007
Posts: 516
Likes: 4
From: NEW YORK
04 E500 20in brabus monoblocks 1 serious 500E & 91 300CE 2JZ 2005 CL65
Oh one more thing...you have a quaife diff??? what is atb???
It depends on how much traction you have. The higher ratios like a 3.73 will not hold as much because the pinion is to small. The 2.73-3.06 is going to be much stronger. I have the 3.27 in mine right now but am switching to the 3.06 for running the quaife atb. I looked into shimming the ring gear but think that if I do not like the 3.06 then I will sell this setup and swap in a different rear end.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
I think the half axles will probably break before the diff though. I ran a 2.026 60' at the track the other day on 245/45 street tires a couple of weeks ago. I am planning on trying to cut a 1.8 or better on stickier tires. I think this might be reaching the limits of the drive line though.
If you are running around doing burn outs and get some wheel hop then it will break a lot sooner.
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Joined: Oct 2008
Posts: 837
Likes: 25
From: seattle
1990 300ce supercharged and intercooled
Yes the 3.06 will be good. With that kind of power you do not need the gears anyways. Think of the useable hp in the lower gears. I cannot use the power I have in 1st at all. Second is at the limit for traction.
The Quaife is an ATB differential. This means automatic torque biasing. It uses helical gears to mechanically transfer power to the wheel with traction.
Really what it does is as one wheel starts to loose traction and wants to spin faster than the other, the torque is increase to the wheel with traction.
They work very well and have a lifetime warranty and require no rebuild for clutches like the clutch type.
If you are interested pm me I can help with getting one and the install.
The Quaife is an ATB differential. This means automatic torque biasing. It uses helical gears to mechanically transfer power to the wheel with traction.
Really what it does is as one wheel starts to loose traction and wants to spin faster than the other, the torque is increase to the wheel with traction.
They work very well and have a lifetime warranty and require no rebuild for clutches like the clutch type.
If you are interested pm me I can help with getting one and the install.
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Joined: Jan 2009
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From: Germany
'12 E350CDI, '12 CLS500, '08 BMW X5D 380hp/ 800Nm
the 3.69 and the 3.06 are both 210mm diffs.
you need the rear cap of the diffcase from a "big" w124 diff (280, 300-24v or 320)
the r129 cap does not fit into your CE
the "big" 210mm diffs were in such w124 models:
280 -> 3.06, 5speed auto 3.69
300-24v -> 3.27 at sedan, 3.46 at wagon, 5speed auto 3.69
320 -3.06, 5speed auto 3.69
420 -> 2.65 but with another rear cap and 4 hole flange
500 -> 2.82 but with another rear cap and 4 hole flange
in R129 and W140 was even a 3.92 available!
you need the rear cap of the diffcase from a "big" w124 diff (280, 300-24v or 320)
the r129 cap does not fit into your CE
the "big" 210mm diffs were in such w124 models:
280 -> 3.06, 5speed auto 3.69
300-24v -> 3.27 at sedan, 3.46 at wagon, 5speed auto 3.69
320 -3.06, 5speed auto 3.69
420 -> 2.65 but with another rear cap and 4 hole flange
500 -> 2.82 but with another rear cap and 4 hole flange
in R129 and W140 was even a 3.92 available!
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