Differential repair or replacement?

Tiny
DENNIS RICHARDS
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 168,000 MILES
The mechanic says that they will have to repair my back differential. The car is not driveable at this time due to the LOUD crunching and popping sounds that happen at slow speeds. The quote was $1600.00 for a repair using a rebuilt differential and $2200.00 if they rebuild mine. If they rebuild it I get a year warranty. The car has 168,000 miles on it and it is now nickle and diming me to death with repairs. Is this cost pretty typical? What do you suggest.
Any suggestions would be helpful.
Dennis
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Tuesday, August 4th, 2009 AT 2:42 PM

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Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The quote was $1600.00 for a repair using a rebuilt differential and $2200.00 if they rebuild mine. If they rebuild it I get a year warranty.

It only takes 3.5 hrs to remove and replace it not including this main part of the differential assy they gonna deal with see below and it only cost $350.00

Its a bad deal if it was me I'll make an about face and run like a speeding bullet and never ever see this guy again. Its your decision sorry this is all I got


https://www.2carpros.com/forum/automotive_pictures/12900_Powertrax_1.jpg

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Tuesday, August 4th, 2009 AT 4:33 PM
Tiny
PROFSLIME
  • MEMBER
  • 2 POSTS
  • 2000 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 77,500 MILES
Just found out that pinion gear is missing a tooth and spiders have some damage to gears. Ring gear looks good. What is the most cost effective way of getting repairs made? Shop that I went to can't make repairs, but told me best course of action would be to replace whole rear with used one, which they can do. Can vehicle be safely driven as is? Only symptom is feeling like you're driving on a washboard when car creeps forward in drive at idle. Otherwise no other symptoms at higher speed. Should I consider going to a transmission shop for repairs? Thanks in advance for your help.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
First of all, if the pinion gear is missing a tooth then the ring gear is damaged and/or must be replaced. Ring and pinion gears are a set - you CANNOT interchange them. Even if the ring gear was ok (which I doubt) it must be changed. Damage to both pinion and spider gears indicates that pieces of debris were floating around in the rear. It will be more cost effective to replace the entire unit as compaired to repairing it. The only question is what is your price range -- a junk yard unit will have some miles on it -- call for prices. A new unit will run around $600.00- with zero miles on it and a warranty.
It is not smart or safe to drive this vehicle with a damaged pinion gear and spider gears. The rear WILL eventually sieze and explode. This could cause transmission - transfer case - and engine damage.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
PROFSLIME
  • MEMBER
  • 2 POSTS
Thanks for your quick response! It has been most informative. Shop that did work guesstimated cost of junkyard unit to be in $500.00 range. Sounds like I need to be looking for different shop. They knew of damage but failed to tell me about it. They had done other work to vehicle, new brake lines, two new tires and new diff cover because old one rusted thru and was leaking. I returned a week later when my wife who drives vehicle daily told me about symptoms. A mechanic in shop told me about what they had previously found, but nothing was documented and no one told me previously. They also told me it would be okay to drive car until they could work up estimate. Where can I find new rear for $600 range. Would it be a complete unit or parts to rebuild? Also I am new to the forum and had already contributed upon asking my initial posting. Thank you once again for your help!
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
PEAR69
  • MECHANIC
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The $600 is just an estimate and is for just the parts required for a new rear (labor will be more). If you want to purchase the unit yourself you must know what the gear ratio is, what size the differential is, and how many splines there are on the axle. It is most likely an 8.5 inch rear but you should go to the drivetrain specialists web site. There you can see what is involved with identifying what rear you have. You can also purchase everything you need there. You must also decide what type of traction you want - limited slip or posi. If installing a new unit, I suggest going with a Trutrack with the new stock gear ratio ring -n- pinion and a timken bearing installation kit. If you do not know how to install this init I suggest having a professional do it. DTS has instructions, but if you don't know what you are doing you can easily mess it up. Once again, driving this blazer will lead to more damage.
BTW - be aware when purchasing a new ring -n- pinion gear set. There are different manufacturers. O.E.M. Is the quietest gear set and I suggest O.E.M. But if you are planning on going off roading and stuff like that then Richmond - U.S Strange - AAM gears are what you want. Motive Gears are junk.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
ERICKSCOTT
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Can I use the rear end pinion of a two door 2001 four wheel drive Blazer
on a 1999 four wheel drive four door Blazer?
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,468 POSTS
Yes if the gear ratios are the same and they bolt up. Please let us know if you need anything else to get the problem fixed.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 12,869 POSTS
If you mean swapping the entire rear axle, as long as the ratio, ring gear size and the brakes are the same it should be OK. Be sure the 2 door isn't a ZR2 option as those are wider and use different mounts than the "common" versions.

If you mean just swapping the actual pinion itself, no. You would want to replace both the ring and pinion so they will wear in as a set.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
RANGERHUTCH
  • MEMBER
  • 1 POST
  • 1997 CHEVROLET BLAZER
  • 220,000 MILES
Would it be possible to engage my 4x4 drive, remove the damaged gears from the rear end and run effectively in front wheel drive with zero torque being transfered to the rear wheels? This would also include the rear end being oiled and sealed so the seals don't go dry and cause extra wear. I know it is probably not the optimum work around but would it work short term as I get the money and parts together.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Removing the rear shaft to prevent torque transfer to rear differential can work but the rear differential would still be turning when the rear wheels are turning. You cannot remove the rear differential as the shafts needs the differential bearings to hold them in position so the correct answer is no, except for moving the vehicle around for parking etc but not long distance or high speed drivings.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
SWANN294
  • MEMBER
  • 3 POSTS
  • 1997 CHEVROLET BLAZER
Hi, my car just started making hard noises when i'm at speeds 40-50mph. I took the car to firestone and they recommended, I take the car to an axle shop, related to the rear end noises. My friend who is a mechanic but not certified, took me to auto salvage yard and recommended that I take a rear-end off a 1998 chevy blazer. My question is two-fold my car is a 1997 chevy blazer is it okay to use a 1998 rear-end. My other question is I only have one car and I need it to go to work until Monday, can I continue to drive the car for work. Are there safety concerns
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok as for the rear end working the wrecking yard has books to tell them that, I beleive it will work fine. Now what you need to know to make sure it will work is have the needed info. Now you need to know what rear end you have weather is is a 7.5 or a 7.62 and what gear ratio you have like is it a 3.73 or 4.10 or? If you don't know or don't have a tag on the rear end to give you the needed info then call your local GM dealer and give them the last 8 of the vin and they can tell you. As for driving it can't tell you I have no idea what it sounds like how loud it is and so on. Therefore I can't answer that question.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
SKATESTER
  • MEMBER
  • 4 POSTS
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
I need to have my front dif re-built, The problem is that it needs to be shipped out and its gonna take a few weeks. Can I still drive the truck without the front axles being bolted into the bearing hub assemblies, or will the bearings fall apart. If not can I cut a pair of junk axles and put the spline shaft end thru the bearing assembly and bolt it in? Will this work.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,922 POSTS
No and No. If you put an axle in place, there is no way to keep it from moving around in the (empty ) differential.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
SKATESTER
  • MEMBER
  • 4 POSTS
The differential would not be there. The whole outer case assembly will be removed. I have to ship it out as a whole, not just the inside. And what I mean by putting the axles back in is cut the axle off at the first knuckle so I could bolt that piece of the axle back to the wheel bearing assembly. Pretty much destroying a set of axles.
I just need to know if I drive away if the wheels will fall off.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,922 POSTS
Based on what I believe you want to do, yes, the wheels will come off. There is nothing to hold the axles into the bearing.

Please be careful if you try something like this. I can't see how it could be safe.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
RYAN SOUTH
  • MEMBER
  • 13 POSTS
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I have a huge problem with my differential. My truck jerked to a complete halt one day-luckily at low speed. I took off the differential cover to reveal many of the teeth on the ring gear had been sheared completely off. The fluid was ruined completely and probably all the bearings-I plan to replace everything. The Question is: it is a 4 door, originally a 4 by 4 (the transfer case does not work) and I want to know what size/type is my differential as the ID tag was not there on the differential. Is there a way to tell from the VIN number? There are many ID numbers in the glove box but that is almost worn away and unreadable. What can I do with only the most basic tools to measure and get a new differential as there are several different differential sizes when I call about parts. Also the pinion shaft bolt has welded to one of the internal gears and I cannot get the pinion shaft bolt out. I spent a full day hammering on it and it only budges a few millimeters. I have given up and will bring it to a differential shop-however they have all told me I need to obtain the replacement differential and I don't know which one it is. Help would be greatly appreciated.
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Axle ID stamped on front of axle housing tube need to wire brush. Fist 3 digts are axle ratio next is axle assembly build last 3 are date manufactured.
Could be 7 5/8 or 8 5/8 ring gear
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
RYAN SOUTH
  • MEMBER
  • 13 POSTS
Thank you for the help. All the part places are asking me if the ring gear is 7 5/8 or 8 5/8. How do I check which one it is? It is a 5 bolt axle, with an open differential, and the VIN number for the vehicle is:
1GNDT13W9V2196408 If that helps? It would really help if I can find out what size it is or how to measure it with basic tools?
Thank you very much,
Ryan
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Friday, May 14th, 2021 AT 12:25 PM (Merged)
Tiny
RYAN SOUTH
  • MEMBER
  • 13 POSTS
Thank you. So how do I determine if it is 7 5/8 or 8 5/8? Is that in the number on the axle housing tubing?
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Friday, May 14th, 2021 AT 12:25 PM (Merged)

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