Tip & How-To about GMC Cars & Trucks

General Motors gear ratios hide] 1 GM Rear Wheel Drive Transmissions 1.1 6 Speed Automatic Transmissions 1.2 5 Speed Automatic Transmissions 1.3 4 Speed Automatic Transmissions 1.4 3 Speed Automatic Transmissions 2 GM Front Wheel Drive Transaxles 2.1 6 Speed Automatic Transaxles 2.2 5 Speed Automatic Transaxles 2.3 4 Speed Automatic Transaxles 2.4 3 Speed Automatic Transaxles 3 GM Manual Transmissions 3.1 6 Speed Manual Transmissions 3.2 5 Speed Manual Transmissions 3.3 4 Speed Manual Transmissions 4 More GM Manual Transmissions 4.1 6 Speed Manual Transaxles 4.2 5 Speed Manual Transaxles 5 GM Continuously Variable Transaxles GM Rear Wheel Drive Transmissions PTU = Power Transfer Unit (Crossover SUV AWD/4WD) 6 Speed Automatic Transmissions RPO Trans Name 1st 2nd 3rd MNK Allison 1000 MNZ Allison 1000 MW7 Allison 1000 MYB MYC 5 Speed Automatic Transmissions RPO Trans Name 1st 2nd 3rd M74 Allison 1000 M22 5L50-E M82 5L40-E MTW Allison 2400 MX4 Allison 2000 MX5 5L40-E with PTU* MV3 5L50-E with PTU* 4 Speed Automatic Transmissions RPO Trans Name 1st 2nd 3rd M30 4L60-E M32 4L60-E HD M32 4L65-E M33 4L60-E Hybrid M41 4L30-E M70 4L70-E Super Duty M99 2ML70 2-mode Hybrid* MD8 ML4 4L30-E MN8 4L80-E HD MN8 4L85-E MT1 4L80-E MW9 HM 200-4R EVT Mode 1 The 2ML70 can operate in electric mode or non-electric mode in first gear with a gear ratio of infinity to 1.70:1. EVT Mode 2 The 2ML70 operates in non-electric mode with a gear ratio of 1.70 - 0.738:1 3 Speed Automatic Transmissions RPO Trans Name 1st 2nd 3rd M40 M41 M65 MD2 MD3 HM-180 HM-200C HM-350 HM-400 GM Front Wheel Drive Transaxles 6 Speed Automatic Transaxles RPO Trans Name 1st 2nd 3rd MH2 MH4 MH6 6T75 (AWD) MH7 MH8 MY9 6T75 (AWD) 5 Speed Automatic Transaxles RPO Trans Name 1st 2nd 3rd Aisin-AW 55-51LE M09 Aisin-AW AF33-5 M43 Aisin-AW AF23-5 M45 Aisin-AW AF33-5 M98 AF33-5 MJ7 Honda 5AT MJ8 Honda 5AT w/PTU* MLS Aisin 50-40E MU3 Saab 76.5mm 4 Speed Automatic Transaxles RPO Trans Name 1st 2nd 3rd MLQ Aisin 81-40LE Aisin ZF 4HP 16 HM 325-4L Jatco JF405-E M10 Jatco JF403-E M13 4T60-E HD M13 4T60-E M15 4T65E M45 Aisin-AW AF33 M57 A245-E M76 4T65E with PTU* MD7 4T65E ME7 4T45-E BAS Hybrid ME8 ME9 MH1 4T80-E MN3 4T65E MN4 4T40/45-E MN5 4T45-E MN7 4T65E HD MS7 A240-E MU4 A246-E MU5 U341-F 3 Speed Automatic Transaxles RPO Trans Name 1st 2nd 3rd M60 GEO Metro MB3 A131L MD9 MX1 A131L GEO Storm HM-425 GM Manual Transmissions 6 Speed Manual Transmissions RPO Trans Name 1st 2nd 3rd M10 Tremec 85mm M12 Tremec T56 ML6 ZF S6-650 ML9 ZF S6-40 MM6 Tremec T56 MV1 Aisin 85mm MV5 Aisin D173 AY6 MV6 Aisin 85mm MZ6 Tremec 85mm 5 Speed Manual Transmissions RPO Trans Name 1st 2nd 3rd M35 Getrag 260 M35 Getrag 260 (2003-2004 Cadillac CTS) M49 BW 5spd M50 M59 GEO Tracker M86 Getrag F23 75mm M94 Getrag F23 M96 Tremec 109mm MA5 Aisin AR5 82mm MG3 Getrag F23 MG5 M50 M51 MH3 Tremec T-5 MK5 C59 ML2 Tremec T-5 ML3 Tremec T-5 MT8 MU3 Saab F25 MW2 MW3 NV4500 109mm TR-3450 TR-4050 TR-4050 2007 Chevrolet Optra and Spark (Trans code Y4A) 2007 Chevrolet Optra and Spark (Trans code Y4M) 4 Speed Manual Transmissions RPO Trans Name 1st 2nd 3rd M20 HM-117 M73 Isuzu MC0 Getrag MC9 MY6 NP260 More GM Manual Transmissions 6 Speed Manual Transaxles RPO Trans Name 1st 2nd 3rd MT2 Opel F40 83mm MU9 Opel F40 83mm MTN Toyota C60 5 Speed Manual Transaxles RPO Trans Name 1st 2nd 3rd D-16 (2005-2008 Chevrolet Aveo 1.4 DOHC / 1.5L) D-16 (2005-2008 Chevrolet Aveo 1.4 SOHC) Y4A (2007 Pontiac Matiz) YM4 (2005-2007 Chevrolet Aveo) D-20 (2005-2007 Chevrolet Epica) L73 Pontiac LeMans F16 M42 Geo Metro M43 AF23 M49 BW 5spd M58 Geo Metro M79 LeMans F13 M86 Getrag F23 (5T45MI) M94 Getrag F23 M98 Aisin 55-51E MB4 Geo Prizm 1.8L MB5 Geo Prizm MFB 2008 Chevrolet Epica 5-Speed S/R (D24) MFN 2008 Chevrolet Epica 5-Speed S/R (D33) MG1 HM-282 MG2 HM-282 MG3 Getrag F23 MJ1 Isuzu MK7 Isuzu MLM Y4M (2008 Chevrolet Aveo 1.6 DOHC) MR3 Isuzu MU3 Saab F25 MV2 Chevrolet Sprint MY7 Early J-car GM Continuously Variable Transaxles RPO Trans Name Lowest Highest M83 V20-E M75 V25-E M16 V25-E AWD

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Where is the output transmission speed sensor located on a 2011 Buick lacrosse cxs 3.6 v6

Scan told popped OSS errors or not?
P0722, P0723 P0722, P0723 P0722, P0723????????????
no Graziano transfer case, rare.?
OSS hunt day , endless here hunts, and no service manual you.
POB car,GM.
6 transmissions used then
all GM 6 speeds.
all 6Txx
xx = 30,40,45,50,70,75.
your car is GM and the car has RTO tag and Mxx codes tell what box tranny is really there.
it may be true all 6Txx have same sensor and location
i have the huge book in it , but reading all 500 pages to find that is no fun for me, post your RPO and ask.
RPO listed boxes
MH2 Transmission - Automatic 6?Speed, HMD, 6T70 MH4 Transmission - Automatic 6?Speed, HMD, 6T70, AWD/PTU MH7 Transmission - Automatic 6?Speed, HMD, X23FHD now the AWD has its own OSS, got AWD, all wheel drive?
IDK what you have nor RPO nor the VIN.
the 70up has OSS (non AWD) top center of the main gear case.
and long black cable to the left.
the lower set 30- to 50 OSS is
"example of the importance of the VIN #. Assume nothing."
quote of the day is this, or RPO does not lie. learn that.

6t30 is here


but learn this first, all 4wd or AWd drive cars the OSS is moved to the rear, so low range works and does no lie to the PCM /TCM
to the rear of car, with AWD in this case if there at all IDK
3.6L may be the bigger box (6Txx) as xx s for more torque.
guessing what GM does is super hard not me reading the VIN the RPM or side fox tag omg 6T70?




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4 wheel drive won't engage

Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error
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1998 and 2000 jeep grand cherokee

This Info taken from Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Grand_Cherokee
Hopefully this will answer your question.

The redesigned WJ 1999 Grand Cherokee shared just 127 parts with its predecessor. The structure was stiffened by PorscheEngineering for sharper steering and lighter weight. The spare tire wasrelocated from the side of the cargo compartment to under the floor togreat relief of owners. The two heavy pushrod V8 engines were replaced by chrysler's first clean sheet V8 since the 60's (SOHC aluminium heads, plastic intake), Chrysler's then-new PowerTech. Although this engine produced less torquethan both previous V8s, it was lighter and got much better fuel economyand provided similar on road performance figures (the 23 gallon fueltank was replaced with one of a 20.5 gallon capacity). The Inline 6engine was also updated in 1999. 10 horsepower (7.5 kW) was added byredesigning the intake manifold. The manual transmission was dropped with this model.
While other Jeep vehicles used the Mopar 5 x 4.5 bolt circle, thiswas the first Jeep following the 1987 Chrysler buyout to receive awider bolt pattern — 5 x 5. The 5 x 5 bolt pattern (also 5 x 127 mm),although common to GM rear wheel drive vehicles and light dutytrucks/vans, has spread beyond its use with GM (and Ford with their 1973 to 1978 LTDs and Lincolns). Chrysler first used the 5 x 5 pattern on full-size half-ton Dodge Ram pickups and Dodge Ramcharger SUVs in 1986.
A notable feature available in this generation was the automatic four wheel drive option called Quadra-Drive II.With three viscous clutches, it was one of only a few four wheel drivesystems at the time with triple locking differentals, joining thecontemporary Mercedes Gelandewagen, Mercedes Unimog and Magna SteyrPinzgauer, and the only one of the four with fully automatic operation,although the axle differentials could not be manually locked like inthe other three vehicles.
The 45RFE and 545RFE automatic transmission in the WJ was notable. It included three planetary gearsets rather than the two normally used in a four-speed automatic. Thisgave it six theoretical speeds, and it would have been the firstsix-speed transmission ever produced in volume, but it was programmedto only use five of these ratios. Four were used for upshifts, with adifferent second gear for downshifts. Although five of the six ratioswere used, Chrysler decided to call it a "4-speed automatic". In 2001,the programming was changed to make use of all six ratios. Rather thanhave six forward gears, the transmission was programmed to act as afive-speed with the alternate second gear for downshifts. The RPM at70 miles per hour (110 km/h) on a 545RFE is 2000 rpm, 200 rpm less thanthe 45RFE programming. 1999 and 2000 model year WJ owners can havetheir 45RFE transmission's programming flashed to enable the extra gearas both transmissions are physically the same. The 42RE 4-speedautomatic remained the transmission for the Inline 6 engine. It was notchanged from the previous model Grand Cherokee's.
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stick shift # Automatic RPM

That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.
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