XI FTW: The xi resource. » Transfer Case
Reverse engineering a BMW with one diff too many.

Transfer Case

11/17/09 - This section currently being re-written and updated with additional images and information! Check back soon!

The transfer case is most fundamental part of the BMW all-wheel drive system. It splits the power from the engine between the front and rear axles. The transfer case is an enclosed (”non-serviceable”) unit attached directly to the transmission output. Driveshafts from the transfer case apply the power to the front and rear differentials.

Specifications

The planetary-geared transfer case used in all BMW E46 3-Series applications is the model “NV 124″ manufactured by New Venture Gear, INC (the X5 SAV uses the chain driven model NV125). New Venture, once a subsidiary of Chrysler Motor, was purchased by Magna Powertrain in September 2004.

NV124

The NV 124 is a full-time, one-speed, four-wheel-drive transfer case. Unlike the chain driven transfer case in the BMW X-series vehicles, the 3-series cases are fully gear driven units. According to BMW, “The reason gears are used is to produce a compact low profile transfer case that could fit in the transmission tunnel of an E46 without excessively limiting the forward travel of the drivers seat.” The gearing provides a permanent 38%F / 62%R torque split (discussed below) between the front and rear drive shafts.

Specification Value
Model Number NV 124 (New Venture Gears)
Max Torque 3482 ft-lbs (4721 Nm)*
Weight 42 lbs
Oil Fill Capacity 0.25 qts (see maintenance)

*BMW has documented the maximum torque to be 221ft-lbs (300Nm). This figure seems extremely conservative based on the advertised NV124 spec.

Operation
The following is the basic operation of the transfer case.
“The input to the Planetary Carrier is from the output shaft of the transmission.”

“The Sun Gear of the Planetary assembly is turned by the Planetary Gears, the Sungear then provides torque to the Transfer Gear.”

“The Transfer Gear drives the Output via gear-to-gear contact. The front axle is driven via a flange connected to the output gear.”

“From the Ring Gear , the power is transmitted via the driveshaft to the rear axle differential.”

“The transmission ratio of the planetary gear set provides a fixed torque transfer of 38:62 (front:Rear). The output speeds to the front and rear axle are the same (1:1).”

Mounting

The transfer box is directly mounted to the Getrag transmission with the transmission output shaft directly driving the transfer case input. The transfer case can be removed by itself, as if often suggested for any drivetrain work (i.e. Bentley Guide). Doing so, however, is not always necessary as it is fully possible to remove the transmission from the vehicle with the transfer case still attached.

The transfer case has two outputs, one each for the front and rear driveshafts. The driveshafts are mated to the case using simple flange and bolts.
Gearing and Torque Split

The transfer case performs much like a common rear (or front) axle differential.

Maintenance/Fluids

The transfer case, as also goes for the transmission, is filled with “lifetime” fluid and, according to BMW, does not need to be replaced. The logical question is where there is a drain and fill plug on the box, if it doesn’t need to be changed. The BMW training guide specifies:

“The transfer case is filled with a lifetime fill of MTF-LT1 P/N 83-22-9-408-942. The only repairs possible are the replacement of the three oil seals and the hydraulic mount.”

  • Oil Volume: 0.25qt (0.24 liter)
  • Drain/Fill plug torque: 25 ft-lbs (33Nm)

Fill plugs are shown in the following figure:

Fill Plug Locations

As for internal maintenance, the NV 124 is enclosed and there is no opportunity for maintenance or rebuild by the common DIYer. If you are reading this and have attempted such a process, please contact me. I’m sure any information would be useful to someone.

Rumors

Unlike many claims and rumors, the transfer case does not implement any use of viscous coupling or variable torque control, either passive or active. The torque ratio is 38%-Front / 62%-Rear.

Disclaimer: I do not claim copyright to the images on this sub-page

  • free hardcore gagging porn
  • xxx girls boobs
  • hot girls with really big boobs
  • black big boob pics
  • sexy sarah beeny breasts
  • teenie oral sex couples
  • wils asian slut videos
  • women with fat pussy
  • free redhead teen blowjob video
  • girl fuck girl with machine
  • mature black fuck movies
  • amateur fuck video cum in pussy
  • nice fuck pics
  • Sexy black lesbians
  • third movie porn
  • big black beautiful pussy
  • ou girls galleries
  • Asian lesbian kiss video
  • anal sex for money
  • skinny petite girl cumshot videos
  • girl first sex pics
  • Turkish nude sex
  • young asian ladyboys pics and video
  • sexy fuck video
  • big tit shemale sex tubes
  • david bruce petite sirah review
  • pictures of young ticklish girls
  • free hardcore amature porn video
  • free amateur lesbian sex
  • asian cunt spread anal
  • free teen sex casting video
  • wife likes group sex
  • Samantha sex and the city sex scene
  • dildo in ass pictures
  • japanese porn drug
  • girls fuck in a car
  • husband mmf bi freefull movies
  • Teen gyno movies
  • big pussy flips
  • wife with strapon sex stories
  • Kara monaco nude videos
  • nude girl celebrity video lindsey
  • free pic aged black anal sluts
  • drunk young teens sex videos
  • japanese nurse handjob uncensored
  • girls fuck shemales video
  • interracial porn twink kissing
  • the petite handbook
  • latin girl anal
  • anal gyno exam pics
  • Pictures of hot sexy girls
  • free long mature videos
  • Sex videos boobs
  • Sex and the city quiz which girl are you
  • innocent girls sex stories
  • young momoiro porn
  • Hermaphrodite sex vids
  • voyeur webcam sex
  • Girls that want sex
  • free pussy lick orgasm
  • fake naked pictures of kristin
  • amateur masturbating women videos
  • Hot asain ass
  • teenage ebony porn
  • big tits big pussy
  • asian nude massage videos
  • free porn mature women young boys
  • petite dresses for special occasions
  • naked ex wife pictures
  • teen videos nubiles
  • Shaved indian pussy
  • free sex with drunk girls videos
  • mature interracial amature wifeporn
  • handjob movie sites
  • dirty celebs sex video
  • glory hole porn vids
  • wife funcking cocks fucking videos
  • good pussy in san jose
  • thick black girls lap dance
  • kevins mom pussy
  • mature milf pussy fuck pictures
  • homemade photos of guyanese pussy
  • mom son video free sex
  • black and blue pussy
  • free japanese masturebate girl
  • jodi clark bikini pics
  • big mouth ugly girl essay topics
  • porn movies with young girls
  • nude pics of rap babes
  • young enormous tits
  • mature thumbs handjobs
  • nudes sex video
  • pictures of dripping pussy
  • free redhead sex videos
  • long flash video porn
  • Huge tits in the world
  • the girl who spoke with pictures
  • teen asian girl naked video
  • Girls sucking and fucking
  • tiny young anal
  • Sex anal pictures
  • fuck wife bathroom
  • beautiful blonde teen slutload
  • my wife admitted sex
  • girl inserts apple in pussy
  • hot teenage girls dancing naked
  • shawn johnson bikini bathing suit pictures
  • orgasm party story
  • Cum shot surprise video
  • young ebony girls on sybian
  • sms sex videos
  • videos mom boy fuck
  • t petite dress pattern
  • peteit teen porn pics
  • teen boys webcams
  • anal fucking big dicks
  • Gorgeous nude teen
  • the olly girls topless
  • free asian minka video
  • lesbians pussy banging
  • Maryse ouellet nude pictures
  • highschool hardcore sex porn
  • Sex porn videos online
  • teen petite blonde
  • anal movie thumbs
  • naked black flat chested girl pictures
  • young nipples pussy ass gallery
  • hot black girls boobs
  • picture of tanya young williams
  • nude black chicks pics
  • cutest young innocent movies
  • school sex amatuer video
  • sexy mature seducing young boy video
  • stuffing panties into pussy
  • charmschool girls naked
  • Lesbian movies full length
  • free pictures of naked men artist
  • real virgins tiny shaved pussy
  • Perfect tits movie
  • kate fingers pussy
  • big nippel porn videos
  • satin teen sex
  • vanessa hudgenes naked picture
  • black cocks fucking white girls
  • fingering pussy videos free
  • africa safari interracial porn
  • pics mom and teens nude
  • amateur girl masterbate
  • teen dp anal compilation
  • homemade anal sex lubes
  • amateur grannie sex pictures
  • heterosexual guy who does anal pla
  • Oral sex positions photos
  • petite cum covered porn
  • mature nude weman bondage gallery
  • Sex on boobs
  • teen virgen indian girl
  • all school girls sex gallery
  • free tight pussy movies
  • huge white dicks small thight pussy
  • lesbian pussy rub movies
  • sexy dark haired beauty
  • close up wet pussy videos
  • pussy with glass
  • sex men military video
  • boobs teen girls
  • suck pictures nude girl
  • anal pussy lesbian
  • jennifer lothrop topless pics
  • young girls drunk fucking
  • mature pregnant mom pictures
  • porn vids dump tube
  • wife plump asses sex stories
  • porn bubble butts
  • xxx suck tit
  • sunny lane ass videos
  • teen girls short skirts
  • free stolen sex vids
  • teen schoolgirl sexy photo
  • Girls sexy bodies
  • free couple porn video
  • goo adult amateur video
  • small waiste round ass young bitches
  • pictures of busty babes
  • girls ass fuck
  • Pussy slip pics
  • erotic pictures of mature feamales
  • hardcore booby porn
  • little summer porn videos
  • Oriya sex movies
  • lick shit after anal
  • new jersey sex videos
  • lesbian having screaming orgasm
  • Spider girl naked
  • free web site pussy
  • two liter in pussy
  • pictures of ugly girl
  • sex and relationship video trailers
  • beautiful black and italian girls
  • japanese office stockings handjob video
  • wild college party videos girls
  • hot babes from japan
  • sexy girls no pants
  • naked pics of jamie fox
  • free busty blonde pornstars
  • pics of amateur women
  • sweet dick sucking girls
  • black cock big butt
  • smooth nude beaver pussy
  • Sex bomb videos
  • rock girls cumshots
  • simulated cum for lesbian porn shoots
  • dry sex outercourse videos
  • naked women handjob massage videos
  • free porn dont like anal
  • inverted nipples on girl
  • teen unprotected sex
  • australian ladyboy porn pics free
  • black lean girls
  • wifes first threesome mfm stories
  • big boob petite teen
  • free sex wife vids
  • like to fuck vids
  • amateur housewife porn video
  • amateur teen bikini models
  • louisiana anal sex babs
  • young teen sex videos homemade
  • coed teens girls wild
  • playgirls having stockings sex
  • Nude pics of candice michelle
  • black and white teen boy
  • free britney pussy photos
  • asian brutality sex
  • boy and girl naked
  • free video young girls fucking
  • pokemon porn gallery
  • anal sex disaster vids
  • sexy bikini teams
  • Big boobs in the pool
  • boat party tits nude
  • Video masturbation femme
  • vivthomas squirt sex video
  • Old girl pussy
  • Big sexy breast
  • teens hd vids
  • Hot girls backgrounds
  • slut wife training vids
  • japanese grab boobs
  • black beauty tumblr
  • amateur sex aict
  • young girl gets fucked by boy
  • kardashian sexy ass
  • free xxx porn sex mp share
  • arab sex movies
  • very young sexy models
  • big butt streaming free videos
  • breathless orgasm videos
  • wife having affair pics
  • drunk girl public fuck
  • mature getting young cum
  • sexy erotic pics
  • most beautiful pussy ever pics
  • xxx freee hardcore sex videos
  • hot moms sex video website
  • free pics mature plus women
  • vacuum pumped pussy babes
  • free cartoon hardcore sex videos
  • blonde harry pussy
  • filipino shemale pictures
  • petite plus size women modeling clothes
  • big boobs mature with hairy pussy
  • brazilian anal galleries
  • pics huge tits
  • thai teens free movies
  • highschool musical cell gabriel naked picture
  • boy porn girl
  • super girls breasts
  • girl riding smallest dick ever
  • hot naked girls blonde
  • Naked female fitness models
  • black ebony gallery interracial picture thumbnail
  • free hard naughty sex videos
  • extreme hardcore movies
  • free on porn vids
  • teen in boots sex
  • hardcore lesbian porn videos
  • erotic cartoons pics
  • free digimon porn movies
  • sexiest gang bang
  • lesbien ass fetish
  • amature petite neighbor blowjob
  • Lesbian nude model
  • teen couples nude video
  • Free teen sister brother fuck movies
  • free homade porn video
  • g girl fingering
  • free groping porn vids
  • male adult oral sex
  • free pussy online
  • teens girl beach
  • wife shared streaming video
  • squirting fat pussy
  • old men teenage girl sex
  • the best handjob video
  • pussy city pimps
  • jasmine byrne anal creampie video
  • japanese girl fucked by two black
  • ebony squirt pornhub
  • naughty amateur movies
  • old lesbians sex videos
  • naked mature exhibionist pics
  • guys making girls have a orgasm
  • free sex videos of faye grant
  • teens naked pictures solo
  • wife pussy bide surprise
  • description fucked video ass flixxx
  • naked pictures of vanessa huchens
  • interracial lesbian videos
  • videos of dead girls getting fucked
  • petite pussy closeup
  • japanese fuck pics
  • no tits sex videos
  • free xxxx sex pics
  • sex y nude babes
  • free celeb naked pictures
  • japanese mature fuckin the neighbor bouys
  • dirty petite flicks
  • la petite patisserie
  • hardcore milf xxx galleries
  • X nude girls
  • best facial porn
  • girls having sex with objects
  • sister seduses brother porn videos
  • cowboy boot sex movies
  • hbo erotic psychological thriller movies
  • fuck my ass sex
  • sexy girl in skirt gives blowjob
  • why girls crave sex
  • Hollywood hot sex scene
  • Naked hot girls with big tits
  • mature blacks fucking
  • pictures og young pussy
  • asian girls on camera
  • petite mom porn
  • amature mature hien spy video
  • naked australian womens pictures
  • Sexy boobs gif
  • black big dick shemale
  • girls naked for pizza guy
  • teen girl makup
  • sister black lesbians
  • gardnergibson black beauty
  • real young teen lez porn
  • Lisa ray nude boobs
  • free tits vids
  • free oral sex eduional videos
  • massage parlor sex free videos
  • porn video heroine
  • Girls eatin pussy
  • good fuck loud pussy
  • girl teen orgy tube
  • free porno china girls vidio free
  • asian transsexuals want true love
  • japanese girls in free porn films
  • Hot vip sex
  • Naughty naked girls
  • Milf tit videos
  • nipples xxx free pics
  • sex and the city nude videos
  • mature whores movie gallery
  • free trailers hot girls xxx
  • hairy gilf ass bbg hardcore pics
  • pictures nude wife mcdonalds website
  • sexy curves orgasm
  • Roja nude videos
  • licks pussy vedio
  • amateur bum sex videos
  • tryout model naked porn reality
  • naked finalfantasy girls
  • teen brunette sex
  • My teen vagina galleries
  • phat ass sexy babes
  • pussy dolls sway me
  • amateur sex video alone at home
  • asian mom teachers daughter sex
  • erotic vintage video
  • Naked nude picture
  • Wife fucks husband in ass
  • frre pussy thumbnails
  • Nepali sex vidio
  • picture reggie grier wife
  • jackie wilson reet petite
  • pornstar abuse porn videos
  • tight pink pussy sqiurters
  • fingering sex tubes
  • very young but gallery
  • suzi perry bikini pics
  • lick pussy clit
  • little naked teen
  • mature women movies exploited