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It can be issue with gears or problem with transmission and needs to be rebuild.Also get the tranny fluid checked. If its low,then such problems occurs. To troubleshoot these types of issues,check the actual solved problems with these types of issues.There are solved help links provided below:-------Click the link below and go through the details and diagrams to troubleshoot the problem :-----2003 Lexus RX300: Transmission Fluid Burnt Brown and not Shift to reverse?
Your going to have to take to a transmission shop and have the blazer scanned for the problem, You could have a broken sun gear which is common or I have also personally seen/fixed a 99 4L60E that had a broken reverse servo piston,it is the piece that engages the low/reverse band under a cover in the valve body area,a piston with a band engagement pin. Anyone that has this problem can have it repaired in the vehicle,its worth checking BEFORE replacing the trans unless the fluid is burn't or there are other symptoms present. Good luck and hope this helps. keep me posted, be glad to help.
Clarification please... Do you mean by "go into" as the shift linkage will not move into the forward ranges or that the vehicle will not move forward? Both are possible scenarios but very different. Let me hear clarification for sending a test procedure for either one.
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!
These transmissions are computer controlled, and this sounds like you have electronic problems coupled with mechanical transmission problems. I suggest you consult a transmission specialist to diagnose your problems.
I had that problem in my 1998 Blazer. There is a module on the passenger side of the truck, next to where the passenger right foot be. Remove the side kick panel to get to module. Disconnect battery before unpluging and pluging new mudule in. This unit controls the electronic switching between 2 and 4 wheel drive..Wes