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What size threads is the test port on this transmission?

I wish to add a transmission temp gauge to this. It is a gm not allison transmission. The new gauge has a 1/8 npt fitting. will this screw in?

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This model always this problem, usually after about 90,000 miles and the other instruments will eventually follow. There are companies that will repair this for you just use google (instrumentclusters.com) to find them. I was charged 185.00 for the repair... GM wanted over 500.00!

Posted on Feb 02, 2010

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SOURCE: I have a 2002 Chevrolet Silverado 2500HD with the

Hello. try a couple of things. make sure the rad is clean from any road debris or dirt. in fact, take a garen hose and pressure wash the rad and condensor fins real well. also miaght have both of the trans filters replaced. there is one inside the trans pan, and one spin on trans filter.

Posted on Jun 19, 2010

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Car temp gauge goes the top of gauge after about 15 miles but dont thinks running hot any suggestions


What make , model and year vehicle ? Could be the stepper motor that controls the gauge . You don't say what vehicle but i know GM vehicles had problem with bad stepper motors 2003 - 2006 . Plus most vehicle coolant temp. gauge info comes from engine computer over serial data communication network . C.A.N . How to Diagnose Controller Area Network CAN . How does the vehicle transmission shift ?

Dec 27, 2016 | Cars & Trucks

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General Motors gear ratios hide] 1 GM Rear Wheel Drive...


General Motors gear ratios
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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

on Apr 15, 2015 | GMC Cars & Trucks

1 Answer

Temp gauge pegged to far right all the time temp sensor is ok. How do i check the gauge in dash? It is on a 1999 gmc sonoma 2.2 engine.


What make , model an year vehicle ? Most newer vehicles ,from 1996 till now the temp sensor is an input to the PCM / ECM , the engine computer .The PCM / ECM sends temp. info to the instrument cluster on a serial data communication network , You would need a scan tool to test this ! Advanced scan tools have test installed , special tests called bi-directional tests . would be able to check gage with this test . Some year GM vehicles had problems with the stepper motor that moves the needle . Old temp. sensors wired directly to temp gage you could disconnect the sensor an ground the wire an see if the gage move to full hot .

Jan 10, 2016 | Cars & Trucks

1 Answer

Temperature gauge not accurate


Most manufacturers do not supply the gauge with the correct temp. It is a computer generated guess that is displayed. If computer sees engine tempature getting warm then it will increase gauge. I had a car that someone removed the thermostat on and it would still show after three minutes it was at operating temp. But heater didn't put out heat for almost 45 minutes. A discussion with a gm engineer made me start testing others. Dodge crystler Mitsubishi gm and many others use this fake gauge. Dodge Cummins use it also for their oil pressure gauge. The only way to have accurate temp gauge is install a manual one or watch it through the scan tool.

Mar 11, 2014 | 1994 Honda Civic

1 Answer

Temperature Gauge Sensor thread size


gm should be 3 mil from bolt diagram in book i have

Nov 09, 2013 | 1987 Pontiac Fiero

3 Answers

Rpm gauge, speedometer, & other gauges completely erratic. 2003 Chevrolet 2500HD, Duramax engine, Allison Transmission. 4WD Crew Cab, Long Bed


This model always this problem, usually after about 90,000 miles and the other instruments will eventually follow. There are companies that will repair this for you just use google (instrumentclusters.com) to find them. I was charged 185.00 for the repair... GM wanted over 500.00!

Jan 22, 2010 | 2003 Chevrolet Silverado 2500HD

1 Answer

03 Duramax Allison Transmission. Sometimes when


Sounds like an igition switch to me, with the discription you are giving.

Dec 12, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

I have a 2005 GMC 2500 Duramax, The problem I have is if I hook onto my 34ft fifth wheel and go any distance the engine pressures up and pukes about 2 quarts of collant out the overflow. I have had the...


the maximum pay load is 3534 lbs (3.5 tons ) and the maximum towing capacity is 18000 lbs or 9 tons
from your description of 2 thermostats I take it is a v8 hopefully a 6.6 ltr v8 turbo diesel
it should have come with a 6 speed allison auto transmission.
with a 35ft, 5th wheeler behind it the combined gross max mass would be getting close to max allowed
add any speed on the highway and the transmission will be running at high oil temperatures and that heat is transferred to the radiator by the transmission oil cooler in a tank of the radiator
the high oil temps could be slippage in bands and clutch packs in the transmission( not noticeable under normal driving conditions) so an check and adjustment would not go astray
next if the adjustments are set properly, it may become necessary for you to consider an air to air transmission cooler so that the heat from the transmission is transferred to passing air flow and not accumulated and added to engine coolant temperature
those kits are available from most accredited transmission specialist shops and will reduce the transmission oil temp by at least 40%
taking that the coolant temp is 95 -98 c the transmission oil will be running a lot lower, saves the oil and the transmission and will help prevent boiling of the coolant
it may be necessary for you to lock up the fan clutch as well

Apr 06, 2017 | 2005 GMC Sierra 2500HD 4WD

1 Answer

I have a 2002 Chevrolet Silverado 2500HD with the Allison transmission. After normal driving for 30 minutes, the transmission temp gauge goes to 300 degrees near the RED zone. Tranny fluid seems to be at...


Hello. try a couple of things. make sure the rad is clean from any road debris or dirt. in fact, take a garen hose and pressure wash the rad and condensor fins real well. also miaght have both of the trans filters replaced. there is one inside the trans pan, and one spin on trans filter.

Jun 05, 2009 | 2002 Chevrolet Silverado 2500HD

1 Answer

Temp gauge hook up late 70s cj7 258 6cylinder


Wherever you can find a threaded port in the cooling system should work,as long as it is the same thread as your sending unit.If you cannot find a compatible threaded port,you may have to go to a hardware store and find some fittings that will adapt your sending unit to whatever threaded port is available.If you can not find one,most engine blocks have two (one on each side) threaded plugs for the water jacket.If you have to,locate the sending unit there with appropriate adapters.And as a last resort,you could purchase an aftermarket temp gauge and use it,as it comes with an assortment of adapters/fittings.

Jul 19, 2008 | Jeep CJ7 Cars & Trucks

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