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2002 chevy trailblazer_ls
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Discussion Starter · #1 ·
Hi guys, got a problem,i have to remove the oil pan so now Im trying to remove the front Differental on my 02 TB 4x4. I got the passenger side assembly of and pulled out of the oil pan now i cant get the driver side off. How many bolts is it, I took out 4 or 5 of them the ones that i could see. Is there any hidden up there anywhere. WHY can I not pry the damn thing off. PLEASE HELP.
 

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2002 chevy trailblazer_ls
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4,125 Posts
There are 2 bolts going horizontally from trans to oil pan. Their is also 2 little bolts hiding in the holes circled going Straight up into the block. Their will be some sort of plug in the holes. Mine has rubber wingnut looking things.



Also, on the driver side the 2 lower bolts on the A/C compressor go into the oil pan. Not to mention the 3 little guys up front

 

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2002 chevy trailblazer_ls
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Discussion Starter · #3 ·
thanks but I see those. But what about taking the bolts out of the driver side of the Front Differential. I took out the ones I could see, are there anymore. I know you have to take off the Dif. so you can get to the oil pan bolts.
 

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chevy trailblazer_ls
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removal

passenger side is called the splinned disconnect. that is in two pieces. and slides on to the oil pan and bolted on. be careful taking that off and dont break it off in oil pan. you will need to remove both cv axles. the driver side of oil pan is called a carrier. there are a few bolts holding that on to pan. did you get the bolt off were the front drive axle hooks up?



to remove the oil pan, you will need to remove the side bolts and front bolts, oil filter, and the bolts that mount to the trans, remove that rubber spacer thing there are two long bolts there that will also need to be removed, and when you have the oil pan separated from bottom of engine look inside you will see another bolt that is attached to the oil pan and to the bottom of motor, its inside the driver side edge of oil pan, also remove that bolt. on passenger side of pan there are some trans lines that run along the side of the pan they tend to get in the way.

you will need to remove your rack and pinion. put on some gloves son, because you will bust them hands up. tie seatbelt through steering wheel and when under truck locate steer column separate rubber cover and take bolt out, thats were the steering connects to rack. you will also see were your power steering lines connect to the rack there is a plastic cover and under that is a screwing holding lines to rack. take that out to disconnect your lines, get a bucket you will loose some steering fluid.

If you cant get that shaft out of the carrier, you can still drop the oil pan with carrier and shaft going through oil pan. i did it, it can be done, you will probably need a buddy to help you out.

you need any parts?


oh yeah drain the oil !!!
 

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2002 chevy trailblazer_ls
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thanks but I see those. But what about taking the bolts out of the driver side of the Front Differential. I took out the ones I could see, are there anymore. I know you have to take off the Dif. so you can get to the oil pan bolts.
If I remember right, there are 4 big bolts holding the diff to the pan and their are a few more oil pan bolts behind the diff.

Have to removed the 4 diff bolts?
 

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2002 chevy trailblazer_ls
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Discussion Starter · #7 ·
I got the 4 bolts out, I took off the passenger side section, are there any clips or anything on the passenger side after you get the dif off? Do i have to pull the shaft out of the passenger side? Or do I have to take off the drive shaft companion flange to pull the drivers side off? I am really stuck. I took all the bolts out, and pulled and pryed on it and it has not budged. The socket that holds the drive shaft cv shaft thingy is still attached to the dif, does that have to be removed before the dif will come off? HELP!! Thanks
 

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2002 chevy trailblazer_ls
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If you can take some pics and post them or email them we might be able to see something.

Here's my checklist of what I remember that came out.

First was the 4 bolts for the diff. 2 are in the front of the diff on top of each other. 1 is toward the middle real low. 1 is at the very back of the diff by the u joint.


3 small bolts at front of pan
21 small oil pan bolt from the sides

4 long bolts at rear of pan (horizontal)

2 bolts at rear of pan between pan and trans bell housing (vertival)

2 long bolts thru the A/C pump into the pan

4 long bolts from passanger side axle disconnect and disconnect harness
jackshaft thru oil pan

U joint at front diff from transfer case --- diff bungied out of the way against the frame

right before the pan went back up
 

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2006 chevy trailblazer_ls_ext
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Funny the things you learn on this forum. I've never once considered using bungee cords when working on a vehicle but I will probably use them in the future for sure!

To the starting poster if you throw some pics up here people may be able to give you a quick answer.
 

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removal

the passenger side is called splinned disconnect. its in two parts that bolt together and is bolted to oil pan. that part should just slide out, mine didnt, it broke off when i was prying it. but get you a pry bar or something and walk it out of oil pan. there are two bolts above the splinned disconnect that you will need to remove in order to remove the oil pan. same concept on drivers side, walk it out of oil pan with screw driver.

I dropped my oil pan with the the middle shaft still going through to the carrier. because my shaft was seized up in there. remember you have to remove rack. put a seatbelt through steering wheel to hold in place. take bolt off steering nuckle under rubber protective sleeve. and remove the bolts holding rack to frame and lower it.

ps. i know that middle shaft is messing with your mind. I took mine out with carrier unbolted and setting loose.
 

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2006 chevy trailblazer_ss_lt
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Do I need to drop the pan if I just need to change the seal on the driver's side where the differential bolts to the pan? Seems like all I need to do is disconnect differential to change seal?
 

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2002 chevy trailblazer_lt_ext
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Do I need to drop the pan if I just need to change the seal on the driver's side where the differential bolts to the pan? Seems like all I need to do is disconnect differential to change seal?
You don't need to remove oil pan to replace inner seal. I was at the dealers today in fact talking with a couple tech friends of mine, one of which incidently happened to have a TB front diff leak. The leak was at the case halves which is very common due to lack of sealant. He also said the oil pans never leak either. I watched him completely remove and disassemble front diff in no time!:eek:
Now I can hardly wait to do mine!
 

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Any chance you can details the steps ?
It sound like its much easier than what is posted here.
He moved to quickly for me..lol! He removed 2 big shields around the strg rack, disengaged axles from diff.,removed jack shaft, removed motor mount nuts to lift motor a bit and also used ratchet strap to pull motor slightly to pass.side and removed a bunch of bolts and got it out of there. Not sure on the sequence of steps though? seemed a little tough to squeak it out of there so I'm sure it's tough going back in..
 

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2004 gmc envoy_sle
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132 Posts
u dont have to remove the oil pan to get the diff out
1.remove belt
2. remove cooling fan and surround
3. remove alternator
4.remove a/c compressor (u dont have to disconnect lines it will reach if flopped onto top of engine)
5.remove axles,pass. side diff actuator,and the shaft that goes through the oil pan
6.remove drive shaft(front)
7.unbolt the diff
i also removed the thermostat with the lower hose
(the fun part)
muscle the diff out the top
i did my bosses in about 3.5 hours in and out (he blew the pinion out the sideso we had a rebuilt unit on hand when i changed it:thumbsup:
 

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2002 gmc envoy_slt_xl
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4 Posts
please help

I know I have to remove differentials to get the oil pan off and I removed the 4 main bolts
on differential but the differential will not budge is there a keeper of some sort in there. Please help it will budge
 

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2002 gmc envoy_slt_xl
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any one out there who can help me

Hi guys, got a problem,i have to remove the oil pan so now Im trying to remove the front Differental on my 02 TB 4x4. I got the passenger side assembly of and pulled out of the oil pan now i cant get the driver side off. How many bolts is it, I took out 4 or 5 of them the ones that i could see. Is there any hidden up there anywhere. WHY can I not pry the damn thing off. PLEASE HELP.
..did u receive help on this question. How did you end up getting it off. I have an 02 gmc envoy xl slt.

I know I have to remove differentials to get the oil pan off and I removed the 4 main bolts
on differential but the differential will not budge is there a keeper of some sort in there. Please help it will budge
 
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