FS: 3.91 REM Polished Ring & Pinion

CFoote · 08-22-2010, 02:19 PM

BIMMERPOST / Classifieds

Asking Price:

None

Item Interest

Hi Everyone,

You might have seen the post a few months ago about Jareds ring and pinion set that he was selling. He has a Z4MC that has a stock 3.62 final drive ratio. I purchased it for my '05 Z4 3.0, unfortunately I found out the final drive ratio on the 3.0 '03-'05 models is 3.07...yikes! Probably a little bit too much of a mod for that car, so I'm putting the ring and pinion set back up for sale.

This is a Timken 3.91 ring and pinion that has been REM polished. This ring and pinion came from a race shop that carefully inspected and polished the set. It is ready to go to a Z4M Roadster or Coupe owner.

As most of you guys know, this is an excellent 'bang for the buck' mod that will give you a great deal more torque to the wheels while still retaining highway driving characteristics.

The REM polishing alone from differential shops is $200.

I paid Jared $650 for the ring and pinion set, and I'd like to get that. I think that's a really fair price given this same setup would go for $900+ if purchased online.

Cash for pickup, Paypal for long distance purchases. Any questions let me know.

Thanks,

Chris

mfanatic325 · 08-22-2010, 09:27 PM

Any published/proven #'s as far as gains or improvement goes? Dyno's perhaps? Just trying to see if this'll actually do anything for me. I don't even know what the final drive ratio is for the Z4M yet (just got my car recently =P ). Will look into it.

Jbs · 08-22-2010, 09:28 PM

damn i wish i had 650 glws

JCz04Bimmer · 08-22-2010, 11:11 PM

Quote:

Originally Posted by mfanatic325

Any published/proven #'s as far as gains or improvement goes? Dyno's perhaps? Just trying to see if this'll actually do anything for me. I don't even know what the final drive ratio is for the Z4M yet (just got my car recently =P ). Will look into it.

A change in the differential ratio will not show up on a dyno graph. Given the equation...

wheelHP = (wheelRPM x wheelTorque) / 5252

...an increase in the differential ratio, for example, raises wheelTorque but lowers wheelRPM (inversely proportional) so the wheelHP value does not change.

That said, you will FEEL the difference in torque as you row through the gears. This is an excellent and common upgrade for our stock 3.64 ratio. This is often regarded as one of the best modifications you can do for the money. Preople also go with the 4.10 ratio but this leads to higher cruising RPMs.

mfanatic325 · 08-23-2010, 01:42 AM

Ah, cool, thanks. Good stuff to know. Will consider this =]

Juice84 · 08-23-2010, 06:37 PM

Not trying to sabotage you FS thread, but be aware this is not in the diff, it would have to be installed. Check you install prices as they could double the price of this mod.

JCz04Bimmer · 08-23-2010, 07:10 PM

Quote:

Originally Posted by Juice84

Not trying to sabotage you FS thread, but be aware this is not in the diff, it would have to be installed. Check you install prices as they could double the price of this mod.

I think the title and pictures are pretty much as clear as you can get but I doubt that clarification will be taken as sabotage! Then again, I used to be the seller of this and am not the current one.

Anyway...

...installation by DiffsOnline, which is probably the nation's best place to send a differential for any sort of refurbishment or modification, charges approximately $1200 if the differential is brought to them while still installed on the car. I think $400 of that is the R&R part so if your differential is out of the car you can save a good amount of money. Either way, all single-use seals, gaskets, etc are included. They also offer the option to fully refurbish your differential housing for $200, if I recall correctly. That's really only necessary if your differential is very old and would probably be silly to do on any sub-100k mile car. Total all-in cost would be under $2000.

...compare that to fully built differentials with the 3.91 polished gears they sell for $2285 and it's pretty clear that this is a great buy. Oh and that doesn't include the $1500 core charge that gets credited only if you send in your differential in sound condition. And $95 for shipping. And then there's installation.

mfanatic325 · 08-23-2010, 09:03 PM

My local shop can probably put this in for me for cheap, but we'll see.

JCz04Bimmer · 08-24-2010, 04:34 AM

Quote:

Originally Posted by mfanatic325

My local shop can probably put this in for me for cheap, but we'll see.

I'm sure. Just be certain they have done this sort of job before. The pricing I've provided from DiffsOnline should be the absolute most one would/should pay to have this installed.

CFoote · 08-25-2010, 09:37 AM

Quote:

Originally Posted by JCz04Bimmer

I'm sure. Just be certain they have done this sort of job before. The pricing I've provided from DiffsOnline should be the absolute most one would/should pay to have this installed.

I wish I had the extra $10k to go buy a M and have this gearset installed

Ah well....

Chris

mfanatic325 · 09-17-2010, 09:22 PM

hehe lemme know when you get desperate enough to sell these to me for a crazy price

dekaliber · 09-18-2010, 02:09 AM

If I can source a E46 M3 diff (I'd like to hang onto my original stock one), I'll be happy to take this off your hands. Unfortunately, I don't know if that will be this year.

JCz04Bimmer · 09-18-2010, 08:02 AM

Quote:

Originally Posted by dekaliber

If I can source a E46 M3 diff (I'd like to hang onto my original stock one), I'll be happy to take this off your hands. Unfortunately, I don't know if that will be this year.

Keep an eye on the M3forum.net... I've seen diffs people have swapped out on there going for relatively cheap.

08-22-2010, 02:19 PM	#1
CFoote Captain 180 Rep 659 Posts Drives: '22 M5CS, '00 M5, '06 Z4M Join Date: Mar 2010 Location: Northeast iTrader: (1) Garage List 2022 M5CS [0.00] 2001 BMW 740i [0.00] 2006 BMW M Roadster [0.00] 2012 BMW X6 3.5i [0.00] 2006 BMW 325xi [0.00] 2017 BMW 540xi [0.00] 2000 BMW M5 [0.00] 2001 BMW X5 4.4i [0.00]	FS: 3.91 REM Polished Ring & Pinion BIMMERPOST / Classifieds Asking Price: None Item Interest Hi Everyone, You might have seen the post a few months ago about Jareds ring and pinion set that he was selling. He has a Z4MC that has a stock 3.62 final drive ratio. I purchased it for my '05 Z4 3.0, unfortunately I found out the final drive ratio on the 3.0 '03-'05 models is 3.07...yikes! Probably a little bit too much of a mod for that car, so I'm putting the ring and pinion set back up for sale. This is a Timken 3.91 ring and pinion that has been REM polished. This ring and pinion came from a race shop that carefully inspected and polished the set. It is ready to go to a Z4M Roadster or Coupe owner. As most of you guys know, this is an excellent 'bang for the buck' mod that will give you a great deal more torque to the wheels while still retaining highway driving characteristics. The REM polishing alone from differential shops is $200. I paid Jared $650 for the ring and pinion set, and I'd like to get that. I think that's a really fair price given this same setup would go for $900+ if purchased online. Cash for pickup, Paypal for long distance purchases. Any questions let me know. Thanks, Chris __________________ '22 M5CS, '06 Z4M, '01 X5 4.4i, '00 M5, '05 Acura RL, '12 X6 3.5, '01 740, 08 335xi, '17 540xi (yes they all are still with me)
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08-22-2010, 09:27 PM	#2
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	Any published/proven #'s as far as gains or improvement goes? Dyno's perhaps? Just trying to see if this'll actually do anything for me. I don't even know what the final drive ratio is for the Z4M yet (just got my car recently =P ). Will look into it.
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08-22-2010, 09:28 PM	#3
Jbs The Photographer 76 Rep 628 Posts Drives: 07 Z4MC BSM/Black extended Join Date: Sep 2008 Location: Los Angeles iTrader: (0)	damn i wish i had 650 glws __________________ John Batte Photography / Flickr / Facebook 2007 ///M Coupe BSM/Black Extended/Loaded \| RPi GT Exhaust w/custom gloss black tips \| KW V3 \| Michelin PSS 245/265 \| Pinnacle F1 Tint 35% \| ZHP Shift Knob
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08-23-2010, 01:42 AM	#5
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	Ah, cool, thanks. Good stuff to know. Will consider this =]
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08-23-2010, 06:37 PM	#6
Juice84 Second Lieutenant 9 Rep 238 Posts Drives: '03 2.5i Z4 Join Date: Oct 2009 Location: Wisconsin iTrader: (0)	Not trying to sabotage you FS thread, but be aware this is not in the diff, it would have to be installed. Check you install prices as they could double the price of this mod.
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08-23-2010, 09:03 PM	#8
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	My local shop can probably put this in for me for cheap, but we'll see.
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09-17-2010, 09:22 PM	#11
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	hehe lemme know when you get desperate enough to sell these to me for a crazy price
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09-18-2010, 02:09 AM	#12
dekaliber Major 75 Rep 1,143 Posts Drives: '07 Z4MC, '11 JCW, '18 Z06 Join Date: Mar 2008 Location: Los Angeles iTrader: (1)	If I can source a E46 M3 diff (I'd like to hang onto my original stock one), I'll be happy to take this off your hands. Unfortunately, I don't know if that will be this year.
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