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Removal/Welding/Installing Differential

Old 04-14-2007, 02:14 PM
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Removal/Welding/Installing Differential

Disclaimer: Don't weld your diff if you plan on just going from home to school etc. All of the steps I performed are my way of doing it, feel free to alter any steps if it's easier for you. this is a one man job but a friend could help at various points. I did this write-up for those who chose to do so. if you are against it keep your comments to yourself please
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This is my second welded diff. the first one broke loose because i had an poor low voltage flux welder. Here it is.

Tools & Material

*to remove diff*


17mm socket/wrench
14mm wrench
12mm wrench
pry bar
hammer
1/2 breaker bar
floor jack
jack stands
wheel chock
drill/wire wheel(optional)
goggles(optional)
Impact gun(optional)

*to weld diff*

Mig welder ( at least 110 Volts)
safety equipment
chisel( thin flathead)
magnet
2 bottles of gear oil
2 cans of brake cleaner
RVT red,copper or black
Drain pan
simple green(to clean all that damn gunk/grease on bottom of car)
Propane Torch ( optional)
----------------------------

Removal

1. insert wheel chocks under front wheels and place Jack under diff toward the center to raise the car

2. place jack stands

3. if you feel a need to you can remove rear exhaust hangers to free up space

4. remove sway bar mounts only ( will give you needed room to clear pinion input)

5. drain fluid now or just allow it to gush out when you remove the rear cover, use 1/2 breaker bar

6. with the e-brake up, proceed to remove the 6 12mm bolts from the half-shafts, you will have to let the e-brake down in order to rotate the half shaft and get the others.

7. once you have removed the bolts, you will need the pry bar to remove right half shaft (only) due to notch

8. Remove 4 bolts from drive shaft, you will need a buddy to pull and release e-break or use thin rod or long 3/8 extension.

9a. before removing the 4 nuts that bolts the diff to the rear sub frame,you may have to blast rust off so that you will not strip the nuts like so.

9b. after you do that proceed to remove them using the following methods.

you will need shallow socket to get upper bolts with breaker bar due to gas tank

10a. Place jack toward back of diff like so, and lightly jack the diff against the tunel

10b. remove two 17mm bolts holding diff to sub frame

10b. place hand in this position, with your elbow bent at 90deg angle and slowly lower diff



Welding

1. Remove bolts from diff

2. use pry bar with hammer to remove cover ( be careful)

3. Clean up rear cover and apply liquid gasket. do this now and it will be very firm during re-installation

4a. As you can see the gears are coated with oil ( a good thing lol) but you must dry them using brake cleaner before you can weld. spray the spider gears only, don't directly spray the Ring and Pinion gears

4b. After about 2 min, the gears will be dry and look like this. pour the brake cleaner out or else you will get an fireball
.( optional but recommended)Take and wet towel cut into strips and insert inside of bolt holes and around bearing like so to protect against sag. also the pieces on the bearing will have to be soaked at least 2-3 times because the heats will dry them up and catch fire.

5. With-in the enlarged portion of the picture, you want to fill the section with the orange line in first with a nice strong continuous bead. the area with in the red circle must be filled/joined in order to increase strength. depending on your spool size, you may need a second. i used one spool per side. you will repeat this action 3 more times on this side and you must rotate the diff and complete the other side. IF you have a Propane torch pre heat the gears before welding

6. once you have welded the corner of all the gear, for extra strength you want to run about two to three layers of continuous bead all the way around, start low and build your way up. i didn't get a picture of the underside of the Ring Gear but it is welded the red line is imaginary, every once in a while use your flathead chisel to knock loose sag away,

7. once you are done welding, pour a bit of gear oil on the gears becuase now you may have to un-seize them.. don't get scared.. the gears are stiff because there was no fluid present when you are welding and the heat gets pretty high. All you have to do is place a 17mm wrench on the bolts of the Ring gear and give it a few manly taps and it will free up again an began to spin freely

8. now take your second can or brake cleaner and blast all of the debris out very good. you don't want sag getting into your bearings. If you have the magnet it will be awesome for getting all of the metal shavings and sag out of the differential carrier. now empty the mixture of gear oil and brake cleaner from the diff housing

10. after you think you got enough of it out, pour one bottle and an half of fluid inside the diff while the cover is off, this will make life a little easier lol

9. Clean the matting surface on the differential housing using a little brake cleaner and a scraper if need be and place rear cover on and follow color/number pattern


Installation

1. Position diff under car, rest the pinion input on the sway bar like so ( if you don't have a buddy to pick it up for you while you jack it up)

2. Now you must lift the back of the diff up and place jack under diff. it will help if you have the jack already preset to a pretty decent hieght. the diff is really easy to handle with the front end of it resting on the sway bar.


3. once you have the 4 bolts through, lightly jack the diff against the body of the car. and insert the two 17mm bolts at the front of the diff. but don't tighten them all the way becuase you have to fully tighten the diff cover bolts first. the reason being is, you want the cover as flush as possible against the sub frame. follow the color pattern, you can start on any nut that you wish.

(trick: you can double a wrench up to increase the amount of TQ you can apply)

4. now completely tighten your 17mm bolts at the front of the diff

5. now move your half shafts back into place. in order to line the bolt holes up you will have to release your e brake and rotate your wheels becuase the diff will be hard to turn now. remember our notch on the right side?? you will need to place the notch above the half shaft like so and use your pry bar to pop it back in.

6. now you will insert all of the bolts back into the half shafts on both side ( 12 in total)

7. Next you will you will re-attach the drive shaft like so. you can have buddy release/pull the e-brake so that you can rotate the wheel and rotate the bolt holes on the pinion input for easy access/tightening


8. last step will be to reinstall sway bar bushings using 14mm wrench and if you have as much gunk and grease like i did you are going to soak the car with simple green and blast it all off with pressure washer.


Thank You for Viewing and go get sideways












Last edited by Biggamehit; 09-25-2007 at 12:04 PM.
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Old 04-14-2007, 07:55 PM
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Originally Posted by Biggamehit View Post
write up will be up tonight
Oh my GOD I have time to pop some pop corn!!! Can't wait to see this one!!!!!!!!
Not even a sneak preview....
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Old 04-14-2007, 09:47 PM
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Dude, keep us updated, i was thinkng of installing a dif myself, like to see how its done first... thanks.
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Old 04-14-2007, 11:35 PM
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LIES! It's 1:37am (central) and I see no write up!
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Old 04-15-2007, 12:18 AM
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221 here and stillll no write up....
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Old 04-15-2007, 12:37 AM
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Cmon guy's cut Bigg some slack... He was probably up late having a good time with some ladies and a few drinks.
It's only 12:39AM over here in Cali.....
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Old 04-15-2007, 12:40 AM
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Well me and Cronux are over here on Chicago time. And since Chicago beat LA for the U.S. 2016 Olympic bid today we shall go by Chicago time. Either way he's still late!
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Old 04-15-2007, 12:48 AM
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LOL... you win....
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Old 04-15-2007, 08:23 AM
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i've been popping in and out of here every few hours since yesterday and still no write up.

i''m sure there's a go reason though.


he's gone awol!!!
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Old 04-15-2007, 08:35 AM
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I bet the air force sent him on some super top secret reconnissance mission with short notice. Of course, thats not what he'll tell us, or the government will have him murdered.
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Old 04-15-2007, 08:37 AM
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OMG buddies you would not believe what happen last night man......

on the way out of the shop i was closing our door and this HUGE DOOR feel off the track and all most murdered me.. luckily with my Linebacker quickness I was able to quickly step back while punching the top of the door away from my head, i have a bruised hand and arm thats about it. I could not leave the shop unsercure like that so became a guard for the night....

However i did manage to drift around our lot a few times LOL. which has a nice S turn.... Im on the way home now to start the write up...

IM soo sorry guys here is the proof




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Old 04-15-2007, 09:21 AM
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Originally Posted by Biggamehit View Post
OMG buddies you would not belive what happen last night man......

on the way out of the shop i was closing our door and this HUGE DOOR feel off the track and all most murdered me.. luckly with my Linebacker quickness I was able to quickly step back while punching the top of the door away from my head, i have a brused hand and arm thats about it. I could not leave the shop unsercure like that so became a guard for the night....

However i did manage to drift around out lot a few times LOL. which has a nice S turn.... Im on the way home now to start the write up...

IM soo sorry guys.

That sucks, except for the drifting parts, hehe. Were the cars ok?
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Old 04-15-2007, 09:43 AM
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yea luckily i didn't pull my work car ( 300 Chrysler) back into its normal spot we just got them about a month ago

im working on write up right now... ill try to have it done by tonight.

Ill be adding piece by piece until its done

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Old 04-15-2007, 11:16 AM
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hahahahahahahahahahahahahahahahahahahahahahaahha
wooooooo
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Old 04-15-2007, 12:23 PM
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Originally Posted by Biggamehit View Post
luckily with my Linebacker quickness I was able to quickly step back while punching the top of the door away from my head
dude thats ****ing awesome, u are the man

punching down garage doors and drifting while guarding the sacred shrine...so baller
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