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Old 11-25-2002, 08:10 PM   #1
Mcrazy
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Yes Boys 391 Diff For Sale

I got a perfect 391 diff for E36. A must have for that extra torque and fast shifting. Selling for $850.00 Canadian, firm on price and serious inquries please. Diff already has new seals + new Red Line high performance diff oil. Thanks.
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Old 11-26-2002, 01:58 AM   #2
mpower1226
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will it fit 318 as well?
Whats the pros and cons of diff.?
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Old 11-26-2002, 10:47 AM   #3
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Do you mean a 3.91 diff or what?

A differential with a higher final drive number will usually allow you to have quicker acceleration, however you'll lose some top end speed and NO it does NOT INCREASE horsepower. The amount of top end speed you'll lose depends on the ratio. As for you, since you have a 318, I always thought that 318s run higher ratio diffs. What's the final drive ratio on your 318?

It's ideal for quick acceleration, or if you track your car/autocross it, sometimes if you have the right setup (i.e. the right differential ratio), then it really help when you come out of the corners.
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Old 11-26-2002, 11:12 AM   #4
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I dont think the 3.91's fit on 318's... dont quote me on that though
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Old 11-26-2002, 06:50 PM   #5
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here you go to give you and idea where u gears will be. this is with the gear ratios of my car so might be just a bit off in any others

3.91 Differential
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Old 11-26-2002, 08:00 PM   #6
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This is only what I "heard". Andrew at "Lee's" (BMW shop) said that the rear diff mounts on the 325's are different than 318. If you swapped the diff mounts from a 325 into a 318, the 325 diff would fit. Guys, not to ruin yet another sale.. hehehe. But you can get a Quaife custom ratio differential w/ their own patent LSD for only $800US now. Quite cheap. Once I save up the funds it's going to be a 3.60 Quaife diff w/ 30% lsd for me.

Bryan
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Old 11-26-2002, 10:24 PM   #7
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Quote:
Originally posted by Autotechnica
But you can get a Quaife custom ratio differential w/ their own patent LSD for only $800US now.
Do you know if that includes the ring and pinion gears? Who sells them for that price?

Thanks..
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Old 11-27-2002, 08:11 PM   #8
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Will this diff fit a '94 eurospec M3? Sorry guys I know nothing about my car, what's the stock ratio or whatever on a '94 M3? Also, what changes would I expect?

Mike
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Old 11-27-2002, 08:19 PM   #9
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Quote:
Originally posted by M-technica
Will this diff fit a '94 eurospec M3? Sorry guys I know nothing about my car, what's the stock ratio or whatever on a '94 M3? Also, what changes would I expect?

Mike
yes, and it's either 3.15 or 3.23, but I really think it's 3.15
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Old 11-27-2002, 08:46 PM   #10
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yes, and it's either 3.15 or 3.23, but I really think it's 3.15
Thx, I guess that's a pretty big jump! Probably not a good idea eh?

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Old 11-27-2002, 09:06 PM   #11
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Why not? You wouldn't be the first to do it. You'd have some crazy acceleration, but you'd run out of gear sooner (lower top speed), unless you swapped a 6-speed euro tranny (6th is overdrive)
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Old 11-27-2002, 09:10 PM   #12
M-technica
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Why not? You wouldn't be the first to do it. You'd have some crazy acceleration, but you'd run out of gear sooner (lower top speed), unless you swapped a 6-speed euro tranny (6th is overdrive)
Well my dad is against me doing any sort of agressive mods to the car. I had to convince him for 4 months just to install a K&N intake.. jeez.

Mike
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Old 11-27-2002, 09:12 PM   #13
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Hey Autotechnica, my name is so much like yours! Haha, I did not copy you if that's what you're thinking.

///Mike
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Old 11-27-2002, 09:14 PM   #14
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Quote:
Originally posted by M-technica
Well my dad is against me doing any sort of agressive mods to the car.
He'll learn....

Just drain the oil out of your current diff, drive around till it seizes, then tell him you need another, and there happens to be someone selling a better one....

Or not.


P.S. don't drain the oil out of your diff, as good of an idea as it is.
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Old 12-02-2002, 09:23 PM   #15
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how much is $800CND in american money?
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