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95 suburban with 4l60e and manual transfer case. shifts rather high in 2wd but livable. when in 4wd high it shifts into 4th and torque converter goes into lock up mode. shifting to third gets it moving again but shifting to od immediately locks the converter again. does the transfer case gear selection interact with the computer control of the transmission or is there a wiring problem?
seems to go through the gears very quckly all in by 30 mph and no torque multication. can only regain acceleration by shifting manually to drive from over drive. shifting back to od once some speed has been gained generates the same lack of throttle response.seems to go through the gears very quckly all in by 30 mph and no torque multication. can only regain acceleration by shifting manually to drive from over drive. shifting back to od once some speed has been gained generates the same lack of throttle response.
this lcokup lack of torque multipication/throttle response only happens when in 4wd mode on the transfer casethis lcokup lack of torque multipication/throttle response only happens when in 4wd mode on the transfer case
when in 4wd it is in fourth with the converter locked up. terationap ther brake and the converter unlocks. release the brake and the converter immediately locks again. converter does not lock up in third in 4wd. normal shift sequence in 2wd with shift points at about 2500 rpm under normal accelleration. 500 rpm drop approximate when converter locks in fourth. very sensitive to load as to dropping out of lockup when below 50 mph. hoping this helpswhen in 4wd it is in fourth with the converter locked up. terationap ther brake and the converter unlocks. release the brake and the converter immediately locks again. converter does not lock up in third in 4wd. normal shift sequence in 2wd with shift points at about 2500 rpm under normal accelleration. 500 rpm drop approximate when converter locks in fourth. very sensitive to load as to dropping out of lockup when below 50 mph. hoping this helps
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It sounds like you are experiencing an issue with the 4WD system on your 2001 Chevrolet Blazer. Here are a few things you can try to troubleshoot the problem:
Check the fluid levels in the transfer case and the front and rear differentials. Low fluid levels can cause issues with the 4WD system.
Make sure that the front and rear driveshafts are properly connected and not damaged.
Inspect the 4WD control module and wiring for any damage or lose connections.
Check for any error codes using a diagnostic scan tool. This may help to identify any issues with the 4WD system.
If the issue persists, it may be necessary to have the 4WD system inspected and repaired by a professional mechanic.
I hope this helps! If you have any additional questions or need further assistance, don't hesitate to ask
On the transfer case Transfer Case - Electronic Shift
The four-wheel drive electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4WD HIGH, and 4WD LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators: one for 4WD HIGH which appears as 4WD, and one for 4WD LOW, which appears as 4WD LOW. Shifts into 4WD HIGH can be made at any speed. When shifting into 4WD HIGH with the vehicle stationary, tooth blockage may occur preventing shift completion. When the vehicle is driven above 8 km/h (5 mph) the shift will complete. When shifting in or out of 4WD LOW, the four-wheel drive (4WD) control module requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission be in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission).
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4WD HIGH, 4WD LOW, and 2WD range positions.
The four-wheel drive (4WD) control module controls the gearmotor encoder assembly that shifts between 4WD HIGH, 4WD LOW, and 2WD modes.
Sounds like you want to know if it is a direct bolt in. The answer is no. The trans for a 4WD has the shortened case and shaft to attach to the transfer case. It can be made to work, but best to do 2WD to 2WD trans.
Hi Dale, Sometimes the front diff becomes wound up. I am not saying this is the problem with your vehicle but what I'm about to suggest may work as it often does with other four by fours. Make sure you have a clear space to drive the vehicle backwards and forwards at a slow speed. As you do so select the two high position on the selector. You may need to reverse and go forward several times. Hope it works for you. Regards John
2
Turn the electronic transfer
case from "2WD" to "4WD Lock" to engage the high range 4WD, if the dodge
truck is equipped with an electronic transfer case; otherwise, shift
the transfer case lever from "2H" to "4H." The electronic transfer case
is located on the instrument panel and is marked with "2WD," "4WD Lock"
and 4WD Low." The lever-equipped transfer case is located to the right
of your leg and is marked with "2H," "4H" and "4L."
3
Shift the transmission into
"Neutral" while the vehicle is either stopped or rolling at 2 to 3 mph
to begin engaging in the low range 4WD. Turn the electronic transfer
case to "4WD Low," if the Dodge truck is equipped with an electronic
transfer case; otherwise, shift the transfer case lever from "2H" or
"4H" to "4L."
Tips & Warnings
Indicator lights will come on and alert you that your vehicle is in either the high or low range of 4WD.
Do not engage in the low range of 4WD drive if the transmission is in gear; you must shift to "Neutral" first.
Many Dodge
trucks allow you to shift from 2-wheel drive to the high range of 4WD
at up to 55 mph--consult your truck's manual to ensure that this is
possible. Do not exceed 55 mph while engaged in the high range of 4WD.
Do not exceed 25 mph while engaged in the low range of 4WD.
Do not engage in 4WD unless you are on slipper or rocky roads.
make sure your 4WD switch is working.and fuse is okay.because your 4WD is control by 4 electric shift motors in which drive a rotary cam which moves the mode fork and range fork inside the transfer case to select between 2WD HIGH A4WD - 4WD HIGH AND 4WD LOW RANGE.a shift motor sensing plate on the shift motor monitors the range in which the transfer case is operating a transmission range sensor monitors the gear position of the transmission.which must be in neutral to shift into low.a pair of solenoids one for 2WD one for 4WD.mounted on the upper right firewall route vacuum to the vacuum motor which engages and disengages the center axle disconnect collar in the front axle assembly.a 4 x 4 shift motor relay module contains two GEM controlled relays which shift the transfer case shift motor between 2WD and 4WD modes.a solid state clutch relay activates the A4WDclutch inside the transfer case.
Yes, but the steps involved in switching the 4wd output shaft, over to the 2wd output shaft are very involved. Thats assuming that the bellhousings are identical. (detachable bellhousing) That you do not need a 30 spline input shaft for your torque converter (96+ blazer input shaft splines are all 28 splines, however you may need a 30 spline in order for the correct torque converter to fit your 2wd vehicle.) You will need to know what 2wd output shaft you need, there are quite a few variations. Then you would need to take the pan off, pull the shift soleniod blocking access to the lockup soleniod, remove the lockup soleniod, remove the pump bolts, pull the pump, unhook the 2nd/4th, band remove the reverse drum - 3/4 drum (by pulling the input shaft twards you) then remove the yellow snap ring holding the output shaft in place. Now the output shaft is able to be removed and switched. Re instalation of the drums/pump is tricky as well, as all the clutches need lined back up to slide back onto there corasponding splines. Long story short, it would be alot more trouble than its worth. : )
seems to go through the gears very quckly all in by 30 mph and no torque multication. can only regain acceleration by shifting manually to drive from over drive. shifting back to od once some speed has been gained generates the same lack of throttle response.
this lcokup lack of torque multipication/throttle response only happens when in 4wd mode on the transfer case
when in 4wd it is in fourth with the converter locked up. terationap ther brake and the converter unlocks. release the brake and the converter immediately locks again. converter does not lock up in third in 4wd. normal shift sequence in 2wd with shift points at about 2500 rpm under normal accelleration. 500 rpm drop approximate when converter locks in fourth. very sensitive to load as to dropping out of lockup when below 50 mph. hoping this helps
What do you mean "goes into lock up" ?
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