3.91 ring & pinion gear set.

kennef · 01-06-2011, 09:59 PM

Hi guys,

I'm new here and would like to seek your expertise.

Does anyone know if 3.91 ring & pinion gear set from turner (http://www.turnermotorsport.com/html...CT_ID=E46M3-RP) is plug and play into the Z4M rear diff?

Thanks in advance.

mfanatic325 · 01-06-2011, 10:29 PM

Since it's for the E46 M3, yes it is plug & play. E46 M3 and E85/E86 Z4M have the exact same differentials. I'm about to have my REM-polished ring & pinion installed next week, along with my AutoSolutions SSK

I was able to get a reputable BMW race shop to do the gut transaction for $930 labor-only.
A different gear shop quoted me $760, but the extra couple hundred spent @ a legit shop gives me huuuge peace of mind.

inTgr8r · 01-07-2011, 06:33 AM

Does it fit? Yes.
Is it plug & Play? IMO, NO.

As mfanatic325 says, get a reputable shop to do the internals for you.
If you do your own wrenching, you can do the pumpkin re & re yourself.

kennef · 01-09-2011, 09:17 PM

Cool. Thanks for the info.

marinb · 01-17-2011, 01:07 PM

Quote:

Originally Posted by mfanatic325

I was able to get a reputable BMW race shop to do the gut transaction for $930 labor-only.

What's the name of the shop you went to (and what city)? I'm thinking about doing a 4.10 swap.

VSmotorsports · 01-17-2011, 01:41 PM

Quote:

Originally Posted by marinb

What's the name of the shop you went to (and what city)? I'm thinking about doing a 4.10 swap.

You may want to check out dan@ diffsonline. Most of the time they have differentials already built and charge a core till you send yours back.

mfanatic325 · 01-17-2011, 04:02 PM

Quote:

Originally Posted by marinb

What's the name of the shop you went to (and what city)? I'm thinking about doing a 4.10 swap.

The shop I went to is called Performance Technic in Pleasanton, California. If you go, ask for Joe.

If your car is relatively low-mileage, I would recommend that you get your own differential rebuilt, as opposed to swapping in an already-built diff. Because you never know what kind of mileage those swaps had on them before they were built. Whereas you know how many miles your very own car's diff has on it.
So unless the shop you're trading diffs with is willing to cover that built diff for more than a year in terms of workmanship/warranty, then I would just get your own personal diff rebuilt instead of swapping.

pokeybritches · 01-17-2011, 04:20 PM

What was the cost out the door? $930 plus a rebuild kit and r&p starts to get pricey.

mfanatic325 · 01-17-2011, 04:24 PM

Quote:

Originally Posted by pokeybritches

What was the cost out the door? $930 plus a rebuild kit and r&p starts to get pricey.

I got my REM-polished ring & pinion for $500 shipped (very good deal). Then the total labor for the differential rebuild, including shim kit and a fluid flush, was $950 cash out the door (good deal as well).

marinb · 01-17-2011, 06:42 PM

Quote:

Originally Posted by mfanatic325

The shop I went to is called Performance Technic in Pleasanton, California. If you go, ask for Joe.

If your car is relatively low-mileage, I would recommend that you get your own differential rebuilt, as opposed to swapping in an already-built diff. Because you never know what kind of mileage those swaps had on them before they were built. Whereas you know how many miles your very own car's diff has on it.
So unless the shop you're trading diffs with is willing to cover that built diff for more than a year in terms of workmanship/warranty, then I would just get your own personal diff rebuilt instead of swapping.

That's exactly how I feel, and why I'd prefer to have someone rebuild my existing diff.

Thanks for the Shop recommendation!

Quote:

Originally Posted by mfanatic325

I got my REM-polished ring & pinion for $500 shipped (very good deal). Then the total labor for the differential rebuild, including shim kit and a fluid flush, was $950 cash out the door (good deal as well).

Who did you buy your R&P from? Is it the BMW OEM R&P or aftermarket?

Did the $950 include the labor to remove/re-install the Diff from the car or did you do that first and just bring the Diff to the shop to do the R&P swap?

mfanatic325 · 01-17-2011, 07:43 PM

Quote:

Originally Posted by marinb

Who did you buy your R&P from? Is it the BMW OEM R&P or aftermarket?

Did the $950 include the labor to remove/re-install the Diff from the car or did you do that first and just bring the Diff to the shop to do the R&P swap?

I bought it off the forum FS section. It was a Timken REM-poished 3.91 ring & pinion. Not a BMW Motorsports ring & pinion.

The $950 was all-inclusive. I'm going in on Wednesday for my 1200-mile service. I'll be slightly over 1200 by then but that's okay

marinb · 01-17-2011, 07:58 PM

Quote:

Originally Posted by mfanatic325

I bought it off the forum FS section. It was a Timken REM-poished 3.91 ring & pinion. Not a BMW Motorsports ring & pinion.

The $950 was all-inclusive. I'm going in on Wednesday for my 1200-mile service. I'll be slightly over 1200 by then but that's okay

Excellent, thanks!

Great news about reaching 1200 miles, now you can really let it rip!

johanness · 01-17-2011, 08:22 PM

Whats the difference (if any) between the Timken and the BMW OEM one?

mfanatic325 · 01-17-2011, 08:58 PM

Quote:

Originally Posted by marinb

Excellent, thanks!

Great news about reaching 1200 miles, now you can really let it rip!

I feel ashamed, but I've already started kind of thompin' on the throttle/diff lolll
I feel like it's been a really good break-in thus far regardless though

Quote:

Originally Posted by johanness

Whats the difference (if any) between the Timken and the BMW OEM one?

Probably just different type of material and/or manufacturing processes used. Then of course, the different branding and probably pricing as well. In the end, as long as it fits well and is equivalent to or exceeds REM-polish, you're good as gold

pokeybritches · 01-17-2011, 10:21 PM

What does the 1200 mile service entail? Fluid flush/inspection?

Sorry for all the cost-related questions. I'm just trying to budget an out-the-door price after shim kit, labor, r&p, services, etc... looks like we're at $950 + (r&p) + (1200 mile service)

mfanatic325 · 01-18-2011, 01:53 AM

Quote:

Originally Posted by pokeybritches

What does the 1200 mile service entail? Fluid flush/inspection?

Sorry for all the cost-related questions. I'm just trying to budget an out-the-door price after shim kit, labor, r&p, services, etc... looks like we're at $950 + (r&p) + (1200 mile service)

haha no problem.
$950 cash out the door for removing the differential AND rebuilding it with my supplied 3.91 ring & pinion; with shim kit included in the price (which the shop sourced from DINAN). The first fill-up of Differential fluid is included in this price as well.

Then I'm paying for the 1200-mile service, where they're nice enough to throw in the labor free of cost, but I must pay for the diff fluid myself of course, which is $100+.

3002 tii · 01-18-2011, 03:19 PM

Quote:

Originally Posted by mfanatic325

haha no problem.
$950 cash out the door for removing the differential AND rebuilding it with my supplied 3.91 ring & pinion; with shim kit included in the price (which the shop sourced from DINAN). The first fill-up of Differential fluid is included in this price as well.

Then I'm paying for the 1200-mile service, where they're nice enough to throw in the labor free of cost, but I must pay for the diff fluid myself of course, which is $100+.

what kind of diff fluid is $100+? is it oem stuff?

i was able to get away with 2 bottles of redline 75w90ns (no friction modifiers) in my quaife, for $25 shipped via amazon.com... the cost of owning a /m i guess? haha... speaking of which i think redline now offers engine oil in the 10w60

mfanatic325 · 01-18-2011, 03:30 PM

haha yeah, the OEM stuff. The race shop manager said he's tried all kinds, and found that OEM is still the best in terms of diff fluid. The other stuff he's tried had some grinding and such, so he always recommends OE fluid now.

As for motor oil, I figure yeah, gotta pay to play lol. Better safe than sorry. It's all probably the same anyhow, but I'm not down to take any risks on these expensive-to-replace items (such as motor, transmission, differential, etc. etc.).

jdl1pt · 01-18-2011, 08:24 PM

mfanatic,

Looking forward to your review of the 3.91. I've been thinking about doing this in my "long term," plan. Any chance you are willing to give a ride when you have her good and broken in so I can feel the pull?

mfanatic325 · 01-18-2011, 08:31 PM

Quote:

Originally Posted by jdl1pt

mfanatic,

Looking forward to your review of the 3.91. I've been thinking about doing this in my "long term," plan. Any chance you are willing to give a ride when you have her good and broken in so I can feel the pull?

Sure, you can even take the car for a spin if you want. I'll call up my local Z4M buddy in San Jose and we can meet up around Great Mall or something in Milpitas.
I did short review here:
http://www.zpost.com/forums/showthre...441622&page=14
Starting with post #292 in that thread

jdl1pt · 01-18-2011, 08:34 PM

Cool, would be fun to do a meet up and get to know some folks from the forum. Will shoot you a PM to set something up in the next few week.

mfanatic325 · 01-18-2011, 08:49 PM

Sounds good

01-06-2011, 09:59 PM	#1
kennef New Member 4 Rep 27 Posts Drives: MC Join Date: Jul 2010 Location: KL iTrader: (0)	3.91 ring & pinion gear set. Hi guys, I'm new here and would like to seek your expertise. Does anyone know if 3.91 ring & pinion gear set from turner (http://www.turnermotorsport.com/html...CT_ID=E46M3-RP) is plug and play into the Z4M rear diff? Thanks in advance.
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01-06-2011, 10:29 PM	#2
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	Since it's for the E46 M3, yes it is plug & play. E46 M3 and E85/E86 Z4M have the exact same differentials. I'm about to have my REM-polished ring & pinion installed next week, along with my AutoSolutions SSK I was able to get a reputable BMW race shop to do the gut transaction for $930 labor-only. A different gear shop quoted me $760, but the extra couple hundred spent @ a legit shop gives me huuuge peace of mind. Last edited by mfanatic325; 01-07-2011 at 12:13 PM..
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01-07-2011, 06:33 AM	#3
inTgr8r Lieutenant General 2429 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Does it fit? Yes. Is it plug & Play? IMO, NO. As mfanatic325 says, get a reputable shop to do the internals for you. If you do your own wrenching, you can do the pumpkin re & re yourself. __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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01-09-2011, 09:17 PM	#4
kennef New Member 4 Rep 27 Posts Drives: MC Join Date: Jul 2010 Location: KL iTrader: (0)	Cool. Thanks for the info.
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01-17-2011, 04:20 PM	#8
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	What was the cost out the door? $930 plus a rebuild kit and r&p starts to get pricey.
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01-17-2011, 08:22 PM	#13
johanness Banned 56 Rep 1,739 Posts Drives: 2008 Z4MC Join Date: Aug 2010 Location: Seattle, Vancouver iTrader: (3) Garage List 2008 BMW Z4M COUPE [7.00] 2012 BMW X1 xDrive 28i [9.00]	Whats the difference (if any) between the Timken and the BMW OEM one?
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01-17-2011, 10:21 PM	#15
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	What does the 1200 mile service entail? Fluid flush/inspection? Sorry for all the cost-related questions. I'm just trying to budget an out-the-door price after shim kit, labor, r&p, services, etc... looks like we're at $950 + (r&p) + (1200 mile service)
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01-18-2011, 03:30 PM	#18
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	haha yeah, the OEM stuff. The race shop manager said he's tried all kinds, and found that OEM is still the best in terms of diff fluid. The other stuff he's tried had some grinding and such, so he always recommends OE fluid now. As for motor oil, I figure yeah, gotta pay to play lol. Better safe than sorry. It's all probably the same anyhow, but I'm not down to take any risks on these expensive-to-replace items (such as motor, transmission, differential, etc. etc.).
	Appreciate 0 Quote

01-18-2011, 08:24 PM	#19
jdl1pt Lieutenant 21 Rep 494 Posts Drives: Z4M coupe 2007 IL Blue Join Date: May 2010 Location: Oakland, CA iTrader: (5)	mfanatic, Looking forward to your review of the 3.91. I've been thinking about doing this in my "long term," plan. Any chance you are willing to give a ride when you have her good and broken in so I can feel the pull?
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01-18-2011, 08:34 PM	#21
jdl1pt Lieutenant 21 Rep 494 Posts Drives: Z4M coupe 2007 IL Blue Join Date: May 2010 Location: Oakland, CA iTrader: (5)	Cool, would be fun to do a meet up and get to know some folks from the forum. Will shoot you a PM to set something up in the next few week.
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01-18-2011, 08:49 PM	#22
mfanatic325 ///M-fanatic 193 Rep 3,885 Posts Drives: '01 911 Turbo Join Date: Oct 2007 Location: Cupertino, CA. iTrader: (23)	Sounds good
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