Transmission problems

Hey guys another blazer issue. I went out to my truck today put it in reverse and heard a snap and then the transmissions pump got real noisy. Needless to say it does work in drive and 1,2,3 but now it has no reverse. This truck only has 80,000 miles and would seem way to early for a complet transmission rebuild. The noise in the tramsmission pump does go away when you give it a few rpm's but im thinking were prolly heading for a rebuild. I serviced the tranny 10,000 miles ago with a new filter and fluid change. I'm also thinking because of the pump noise I prolly can't get away with replacing just the valve body. What are your impressions of this? I'm having a hard time thinking it needs a rebuild at 80000 it's too soon...........

Hey guys another blazer issue. I went out to my truck today put it in reverse and heard a snap and then the transmissions pump got real noisy. Needless to say it does work in drive and 1,2,3 but now it has no reverse. This truck only has 80,000 miles and would seem way to early for a complet transmission rebuild. The noise in the tramsmission pump does go away when you give it a few rpm's but im thinking were prolly heading for a rebuild. I serviced the tranny 10,000 miles ago with a new filter and fluid change. I'm also thinking because of the pump noise I prolly can't get away with replacing just the valve body. What are your impressions of this? I'm having a hard time thinking it needs a rebuild at 80000 it's too soon...........

You are going to have to tear itbdown to fix it.
Good time to rebuild it when in there.
Or just spring for a GM factory rebuilt.
3 year and well over 50 K warranty.
But what ever.
Replace the sun shell with the HD one.
Good Luck

You are going to have to tear itbdown to fix it.
Good time to rebuild it when in there.
Or just spring for a GM factory rebuilt.
3 year and well over 50 K warranty.
But what ever.
Replace the sun shell with the HD one.
Good Luck

2 questions

About how much is a factory rebuild with a shop discount
and also does the factory rebuild have the HD sunshell

I may just buy a manual and do my first transmission dam this sucks

Call your dealer for the price.
Some give better price than other.
And some give a 100-200$ rebate.
Usually around 1500-2000 $
The factory rebuilt should have all updates done.
But not sure if they use the best beast sun sheel gear or HD sun gear sheel or just a better GM sheel.
Again ask the GM parts dealer to find out for you.
Let us know what he tells you.

I talked to my transmission guy this morning and he said he would completely rebuild mine with a beast sunshell, new updates to valve body and new convertor for $850.......With a 12 month warranty. I take it to him and hell turn it around in a day in a half. I'm getting ready to pull it today!!!!! Dam I'm glad I bought that hoist.....


MT do you think my other post could be related to my tranny taking a shit?

Sounds like a winner.
Be sure to flush you rad transmission coole.

On other post post a link to it and I will look at it.

Here it is MT http://www.automotiveforums.com/vbulletin/showthread.php?t=942128

And thanks for the advice bro......

That is a good question.
But.
Hard to say about that.
There may be more problems in the transmissionthan sun gear shell.
See how the rear noise does after you get the transmission rebuilt.
Also tell your rebuilder about the clunk noise so he can watch and check everything in the transmission.
Let us know how it goes.

Well got it out today started at 2:30 and finished at 7:30..... Five hours for my first blazer tranny...... Off to the rebuilder tomorro. I'll let ya know how it turns out.

What do u think of this, I found a 30000 mile tranny out of a 2004 blazer for $750 with a scrap yard warranty. We have a very large gm scrap yard near me witch deals in low to very low mileage parts. hmmm something to think about in 04 did they fix the sunshell problem?

Hey guys another blazer issue. I went out to my truck today put it in reverse and heard a snap and then the transmissions pump got real noisy. Needless to say it does work in drive and 1,2,3 but now it has no reverse. This truck only has 80,000 miles and would seem way to early for a complet transmission rebuild. The noise in the tramsmission pump does go away when you give it a few rpm's but im thinking were prolly heading for a rebuild. I serviced the tranny 10,000 miles ago with a new filter and fluid change. I'm also thinking because of the pump noise I prolly can't get away with replacing just the valve body. What are your impressions of this? I'm having a hard time thinking it needs a rebuild at 80000 it's too soon...........

Crazy, It will not move at all? You sure your flywheel bolts did not fall out? My last S-10 with a 700-r4 tranny went 325,000 miles before going out it finally blew out overdrive then shelled the torque converter,I picked up one from my local pick and pull junk yard outa a low miles astro van and had to switch over sensors but worked like a charm and also switched gears like a race tranny being valved for the weight of a astro van and it only cost 125 bucks lol..

Crazy, It will not move at all? You sure your flywheel bolts did not fall out? My last S-10 with a 700-r4 tranny went 325,000 miles before going out it finally blew out overdrive then shelled the torque converter,I picked up one from my local pick and pull junk yard outa a low miles astro van and had to switch over sensors but worked like a charm and also switched gears like a race tranny being valved for the weight of a astro van and it only cost 125 bucks lol..

Positive These blazers are known to have inferior sunshell gears witch commonly break and when they do you have no reverse. And also My flywheel was attached like it was suppose to when I took it out yesterday.

I dropped it off to the rebuilder today and he's gonna hook me up with a new neutral safety switch witch I broke being gm had a great idea to glue the connectors in to it. Idiots This guy has a killer turn around I dropped it off at noon and I'll have it tomorrow afternoon.

Also will 6 quarts be enough to fill this thing back up?

Positive These blazers are known to have inferior sunshell gears witch commonly break and when they do you have no reverse. And also My flywheel was attached like it was suppose to when I took it out yesterday.

I dropped it off to the rebuilder today and he's gonna hook me up with a new neutral safety switch witch I broke being gm had a great idea to glue the connectors in to it. Idiots This guy has a killer turn around I dropped it off at noon and I'll have it tomorrow afternoon.

Also will 6 quarts be enough to fill this thing back up?

More like 12 QT.
With drained converter or rebuilt converter and flushed out oil coolers.

Put 5-6 in before you start it.
A then start engine a few seconds and shut off.

As your rebuilder about what kind of fluid to use.
Also ask him what all he found bad in there.
Post back what he found.
Dexron 111 is no longer made.
Then add 3-4 more.
Then start engine and drop it into reverse and drive and back to park.
The leave engine running in park and fill to cold line.

Then warm it up good on the road and fill to center of hot mark.
Good Luck with it.

In '02, the 4L60E's were upgraded a little, which helped in the durability. The sunshell was upgraded, but it still was hit and miss, and it also depended on how it was driven too. As for oil, dexron VI is a good oil, a much better improvement in oxidation stability, heat breakdown etc. My choice still though has been Amsoil tranny fluid. I use this in everything I own, great oil.

As for the safety switch, they were not glued, it looks like that but that was not the case. There was a TSB on this, the switch would heat up as a result of it taking heat from the transmission. The glue that was used in the switch itself melted and oozed out to the connection and damaged the connection causing transmission problems to pop up. The new switches are suppose to be better built to avoid this problem.

Great info guys... I picked my tranny up this morning and the sunshell teeth were completely gone, my clutches actually looked pretty good, He said the fluid smelled burnt so maybe the convertor was going south. The valve body was rebuilt including a new harness and solenoid. All this in a 80,000 mile tranny witch should of had another 50,000 of life left at least. Oh well I'll be putiing it back in on saturday, I had to order a prindel switch being the tranny shop didn't have 1, That will be in tomorrow morning... I have a tranny jack on reserve for a saturday pickup to save my back.... I'll let ya know how it turns out.

Well the worst case scenario has happened I believe , I got the tranny in with not even a hiccup and put in 1 quart in the convertor than 10 quarts when finished. Ran it for a good hour no bad sounds but no gears. You put it in gear and it wont even attempt to turn thre driveshaft. This sux....

Did you flush the transmission oil cooler lines and cooler?
First thing check transfer case and make sure it is not in neutral.
With transmission in park can you roll it back or forward then try it in neutral and see if it will roll any?

Does transmission have any line pressure?
Put a pressure gauge on it or pull cooler line and see if pumping fluid.
Any different noise when in park or drive or reverse?

Call the rebuilder and see what he says to do or check.
Let us know how it goes>

Did you flush the transmission oil cooler lines and cooler?
First thing check transfer case and make sure it is not in neutral.
With transmission in park can you roll it back or forward then try it in neutral and see if it will roll any?

Does transmission have any line pressure?
Put a pressure gauge on it or pull cooler line and see if pumping fluid.
Any different noise when in park or drive or reverse?

Call the rebuilder and see what he says to do or check.
Let us know how it goes>

Well Mt there was no new sounds after installing it. Yes the lines were flushed. How do you check and see if the the transfer case is in neutral it is a 4 button setup (Auto 4wd) The only way I can get the driveshaft to turn is to put it in nuetral. When I go through the gears with it running Nothing happens.

Well Mt there was no new sounds after installing it. Yes the lines were flushed. How do you check and see if the the transfer case is in neutral it is a 3 button setup (Auto 4wd) The only way I can get the driveshaft to turn is to put it in nuetral. When I go through the gears with it running Nothing happens.

Put transmission in park and see if it will roll back or forward.
If transfer case is in gear and transmission is in park the vehicle will not roll.

Hey I just had a thought the only thing with any adjustment to it is the neutral safety switch, if it was not adjusted correctly would this send the transfer case in neutral? How is this switch adjusted? The indicator on the dash is correct.

It's on the lift still so I'll have to let it down to see if it rolls.

No on saftey switch.
You will have manual low or reverse no mater where it is set or adjusted.

Make sure transfer case is not in neutral.
Have you done that?
Check line pressure.
Have you checked line pressure?

If line pressure and transfer case is not in neutral and transmission is full of fluid engine running the only other hope for it is drop pan and see if valve body linkage and transmission filter is on right.
If all of that is good you have a major problem?>\
Other things to check and think about.
You did put the converter bolts back in?
Is flywheel broke?
Did the converter slip out when installing?
Did the converter fit lose to flywheel or was it right against it and snap pump gear?

I think it is time to call you rebuilder and see what he wants you to do.

Let us know how it goes.

Ok I'm assuming I didn't have the torque converter seated in the pump, can I simply pull back the tranny and reseat the converter?

If the pump drive lugs were not engaged in the converter there would likely not be enough clearance to install the trans. If the flexplate was already tight to the converter when the trans was installed, you may have missed the pump lugs.

A line pressure check would be a really good idea, as MT advised.

Another indication would be the dipstick level. If the dipstick shows a high oil level with the engine off, then shows a normal or lower oil level with the engine running, the pump is at least moving something, meaning that the converter lugs are engaged with the pump rotor.

I've had a pump pressure relief fall out on me after rebuild. It happens when the PR valve is installed with the snap ring in the first detent instead of the second. If you remove the oil pan and find these parts, that's what happened:

http://mysite.verizon.net/strey/files/PumpPressureControl.jpg

You might also want to pull the oil pan to see if the filter is installed correctly and the pickup tube seal is in place, too.

Do the proper testing as outlined to find out the problem..
If it was a case of converter not seated in pump gears the pump gear ears will be broke off.
The transmission will have to come out and pump repaired.
Let us know how it goes.

I'm getting better at this I pulled the tranny today in 3 hours and found a broke oil pump gear. It's going back to the builder tomorrow to be repaired.

Even thow it is bad news.
Glad you found the problem

Even thow it is bad news.
Glad you found the problem

Well this wasn't all that bad, I convinced the wife I needed a transmission jack, I'll never have to rent one again. lol

I dropped it off this morning and my builder took it pretty well, As we both said it is what it is, and he said i'll have it back today.

I dropped it off this morning and my builder took it pretty well, As we both said it is what it is, and he said i'll have it back today.

Ask your rebuilder if he can fix you up with a converter hold in bracket/strap.
A flat piece of iron bolted to case hole and bent to hold converter in.
Real easy to make up.
Used by a lot of rebuilders for transmission shipment to keep it from slipping back out.
Good Luck

Ask your rebuilder if he can fix you up with a converter hold in bracket/strap.
A flat piece of iron bolted to case hole and bent to hold converter in.
Real easy to make up.
Used by a lot of rebuilders for transmission shipment to keep it from slipping back out.
Good Luck

Thanks for the advice mt I think I'll make a strap out of some 1x I have lying around just to be safe.

I got my tranny back this morning and my oil pump gear was definitely toast, as a matter of fact it was broke in half. My builder showed me were the conterter was running on the gear and I was only about .30 off ...... That sux I was so close but so far away.

I got the transmission in today with no problems, the job went pretty smooth. One tip when your bolting up the tranny to the motor make sure you can spin the torque converter. If the torque converter still spins with the tranny bolted tight to the motor your have it installed right. If it doesn't spin it's bound up and WILL take out your pump! This is what I learned from this job.

I got the transmission in today with no problems, the job went pretty smooth. One tip when your bolting up the tranny to the motor make sure you can spin the torque converter. If the torque converter still spins with the tranny bolted tight to the motor your have it installed right. If it doesn't spin it's bound up and WILL take out your pump! This is what I learned from this job.

Thanks for posting back how it went.
Glad all is well.
Good luck with it.
MT