Question about 1996 Chevrolet Blazer

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Is trany OK

When you take off it feels as though the trans. is shifting back and forth. This IS the first time I ever drove a blazer

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Many things could cause this but the three I can think of is a bad motor or transmisson mount, or a vachuum leak

Posted on Jun 29, 2009


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My trany was full of fliud,not burnt,but on my way home,it started slipping.I had to drive by starting in the lowest gear and manualy shift up to drive.I drove about 3 miles to get home.I drove slow and...

There are many different problems that can cause this but what I've discovered most is a sticking valve or chunk of valve body casting material hanging up from time to time. I'm assuming this is a 4T60-65E trans?

Sep 16, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Transmission 1994 lincoln towncar- 89000 miles

I would not conclude you have a trans problem,as some other issue maybe be confusing the shift stratagy.
The temperature issues and time driven are the key here.
I would check for stored codes first.
Then go over the basics-Spark Plugs,Ignition,Egr Valve,Vacuum Leaks,MAF Sensor and so forth.
Clean up the engine driveablity issues first.

Becareful when considering changing the trans fluid. That will not fix anything and may cause it to slip more,if you get to that point in your testing

The time parked is not a concern ,as I feel these issues where there before.
If the engine is not running correctly ,you will get just what you discribed,with the shifting up and down

May 05, 2010 | 1994 Lincoln Town Car

1 Answer

Auto trans will shift some times and manual only

It may be just the vehicle speed sensor. Does the speedometer work OK? The vehicle speed sensor tells the computer how to control the shifting and it also sends a signal to the speedometer. Is the trany full of fluid, is it fairly clean? It should be red. Most vehicles, you check the fluid with the engine idling, in park.

Dec 12, 2009 | 1992 Geo Metro

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Chevy blazer wont shift into reverse goes forward only

It dont mean its totally bad ok,go to a trany shop an ask for a pressure port test for reverse,it could be a servopiston wich hold the rear band to hold the planetary,and invert the rotation ok,the foward clutches is the same for reverse,so the clutch is not burnt,it will be the piston,if the tech remove the valve body,they can change that piston and it work again,theres its not necesary to remove trany ok,dont worry,its more dificult to find a sincery people than the job itself.GL

Nov 25, 2009 | 2000 Chevrolet Blazer

1 Answer

Trani shifts hard

change trans fluid and filter

Oct 03, 2009 | 2000 Buick LeSabre

3 Answers

Code p1870

My 1999 blazer LS 4WD had the hard upshift 1/2 and the P1870 code. I purchased the improved valve body, sep plate and all gaskets and small filter screens that are on the sep plate. I purchased everything from a transmission shop selling these kits on ebay and came with FULL instructions. Prior to the new valve body installation I had the tranny flushed at Jiffy Lube. The old fluid did not smell burnt but was a little dark and I wanted to make sure I had clean fluid prior to replacing the valve body. My son in law and I did the job * tranny in vehicle " in about two hours. I have not had a hard upshift nor any codes in 2,000 miles. I had taken it into a dealership and was quoted 1,900.00 to repair the transmission.
I paid 110.00 for the complete valve body kit on ebay 12/6/09.
I would remove the inspection plate and look at the tork converter, smell your tranny fluid and if it doesn't smell like a camp fire... don't throw your dollars away to a dealer or transmission shop!
This is a very common problem.... I would guess that most are caused from not having your tranny serviced! Keep that fluid clean and the filter fresh !!

Jun 11, 2009 | 1999 Chevrolet Blazer

1 Answer

1995 Honda Passport LX 4WD Automatic - "CHECK TRANS" indicator

try trany fluid change it and put new trany filter

May 05, 2009 | 1995 Honda Passport

3 Answers

Engine Code P1870

P1870 is common. There is a valve that wears the body and will start to stick. It will be most noticeable during the 1-2 upshift as the computer will have to increase the pressure to work the sticking valve. If you haven't had the code long enough for the sticking valve to wear out the clutches you can but a tool to fix the valve body and replace the valve.

The problem really is the lockup coverter. The trany is taking too long to lock or unlock the convertor. When the computer detects this has occured twice in a row, it goe into OS mode. It decides it's slipping so it turns it's pressure up to the max. You get kicked in the A everytime if shifts from 1st to 2nd?

When is the last time you checked the fluid? Make sure it is correct color and amount... then look into THIS THREAD to find an aftermaket fix for your problem. (Trans Go Kit)


Comment posted on Jul 21, 2009 This comment in particular:

No, if the CEL is on and if it's a 1870 code.
Typical it will be OK when it's cold. It takes a lot of stop and go, or a little freeway to bring it up to failure temp. So every day things start off OK, but the shifts are a little off. If I was driving on the freeway at about 50 then slowed down and speed back up it would do something strange. It seemed to slip or shift gears slightly back and forth. Anyway after it's warm it starts to shift hard from 1st to 2nd even at light trottle. The problem is the lockup coverter. The trany is taking too long to lock or unlock the convertor. When the computor detects this has occured twice in a row, it goe into OS mode. It desides it's slipping so it turns it's pressure up to the max. You get kicked in the A everytime if shifts from 1st to 2nd.
Why this occures is on of GM's trans improvements. On the older version of this trans. (and those with the shift kit installed) you will feel it when the convetor locks and unlocks. Some ******** at GM desided this is a bad thing. His fix is insted of just locking and unlocking, he came up with a PWM system that would slowly lock and unlock by slipping the clutch in the convertor. To do this the PWM valve in the valve body bounces back and forth rapidly as the clutch locks or releases, as oposed to just moving once from lock to unlock. Guess what this does? It wares out part of the valve body! Are you getting the big picture yet! GM fixes this by replacing the valve body. The new ones don't have this failure mode (so says GM). The Trans Go kit make all of the shifts short and sharp, you will feel it every time the convertor locks or unlocks. It occures just above 40MPH at light throttle.
Hell, I could have told him that would happen! As part of the kit you will modify the servo and add springs. I do not think you will need a Vet servo after the kit is installed. If you do your homework first, you might get the job done in 5 hours. It took me longer, I did not know how to remove the servo.
Good luck. Also if your fluid is burnt, you will need a rebuild. The seals and clutches will be fried. Thanks for using FixYa - a Very Helpful rating is appreciated for answering your FREE question.

Jan 23, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

K-5 blazer trany will not come out of first gear what is the porb

i used to have an 85 k-5 and it did that mine was the fuel filter but it could be the transmission filter our moudule the fuel filter is the cheepest and easiest thing to try first. good luck hope this fixes your prob.

Dec 18, 2008 | 2000 Chevrolet Blazer

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