# exploded 10 bolt HELP!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lowlevel2, Mar 7, 2000.

1. ### lowlevel2Registered Member

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Feb 22, 2000
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columbus ,ohio
Yes im new,but am a big blazer/sub person.
fisrt things first. I traded my 86 blazer in on an 89 sub a year ago.... I needed more room I know this is a k5 forum but noone seems to post on the sub forum.
Anyway my 10 bolt (rear) exploded on the way home tonight.and i must say i sucked.my question is-can i replace it w\a 12 bolt easily? like will it bolt up EXACTLYlike the 10 w/out rewelding anything like the shock mounts and stuff like that?And at the same time i need to lift the rear w/a 2" add a leaf (trailmaster).Like all 1\2 ton subs it sags in the rear.why not lift it while i change the axle?Blazers/subs should come at least w/a 12 stock in my opinion.
I need to get this resolved asap and will be replacing this thing myself because none of my friends will volunteer to help.I need to know the easiest (cheapest way to fix this.I am running 31x10.5 now but soon will be upgrading to 32's. What gear should i run 3.73 or 4.11?Btw i dont go off road much... I drive 40 miles to work everyday and am basically screwed w/out my truck,So if any of you know if this is an easy swap please tell me all that is involved inj doing this.
I also know if i change my rear gear i need to change my front,but ummm thats gonna have to wait till summer
My sub is an 89 GMC w\350tbi and i think its got a 700 trans(its big)w\over drive,10bolt axles w\3.42 gears,241 tranfer case.PLease help because i hate bumming rides off ppl.

P.S.how you get those u bolts off w\out a torch?

Yes the 14 bolt sounds great but seems like a mother to install and im not sure,but wouldnt i need to goto 16" rims?.........aaaaand that mean more (16" tires too)I havent opened the case up yet,but i did drive it about 20 miles clanking and after i got home i put it up on jacks stuck it in drive clank ..clank.. bamm..clank.,The umm T/Case was making a squeaking soundI ran out of day light before i could really check it....
This truck has 170,000 miles on it, still all original(Grandpa type truck)
Oh yeah and is the 12 bolt yoke the same as the 10, or will i need to get a special yoke?
sorry about all the questions but i need to know any problems i will run into....

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Sorry I can't help with the axle problem, but I do have a couple suggestions for the u-bolts. 1. Attack the nuts and exposed threads with a good-size wirebrush to clean the crud off, then start soaking them with Liquid Wrench or WD-40. Let them sit overnight to penetrate. OR, 2. Clean as above, then light a candle and let it melt some of it's wax. Blow out the flame, then quickly pour the melted wax onto the threads and nuts. Let it sit until the wax is cool to touch, then go after them with your biggest breaker bar and the appropriate socket. I know the wax trick sounds fishy, but it does work. Good luck!

Semper Maintenance!

3. ### **DONOTDELETE**Guest

Yeah it will bolt up, I would go with a 14 Bolt Semi Floater or Full Floater rear !!

<font color=red>BigBurb<font color=red>

4. ### Andreas1/2 ton status

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About upgrading gears: If you have a th700 with OD you should get 4:11´s with the 32" tires. If you change gears in one diff at a time (I assume you change the rear first)disconnect the front driveshaft, atleast thats what I did, just to be sure I didn´t wreck anything in the front driveline, not to mention the T-Case.
Disconnecting the U bolts/Clampers requires lots of strengh, big tools and, if rust, help from the man upstairs :-)

Sorry, I have no idea if a 12bolt will fit "bolt-on" in a 10bolts place.

/Andreas

5. ### BIGJ1/2 ton statusAuthor

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As far as the bolts...well you may get lucky if you live down south. you will have to get a deep well socket. If you live in the rust belt you are going to have to cut them off. If you don't have a torch of a air compressor to run a cut off tool then hit the Home Depot and buy a dremel. You can get a pack of cut off wheels for them and I have had to cut off a U-Bolt with one. it took a few of the discs to do it but it did it and was only about $45. One you have one of these you will not know how you lived without one. So look at it as an investment not an expence. Just becarefull and try to stay out of the line of fire..the discs are brittle and if you bind one it send parts of the disc flying..Eye protection is a must. Diging it in the dirt with my K5's Grim-Reaper 7. ### turbo1/2 ton status Joined: Feb 18, 2000 Posts: 109 Likes Received: 0 My 86 suburban 3/4 has a semi floater 14 but it is 8 lug not 6. Last I checked the 1/2 ton 2Wd are 5 lug wheels the 1/2 ton 4x4 are 6 lug and the 3/4 ton and one ton are 8 lug so I don't know where you found 3/4 semi floater 14 bolt with 6 lugs. 8. ### 89Jimmy1/2 ton status Joined: Feb 17, 2000 Posts: 192 Likes Received: 0 Location: Northern N.Y. east end of Lake Ontario A 4 1/2" angle grinder with an .045 thick cutting disc worked great to cut the U-bolts when I swapped mine. Put a '76 front and rear under my '89. (Dana 44 and 12 bolt) Everything fit perfect. Even the brake backing plates were the same, I used the '89 complete brake assemblies on the '76 so I didn't even have to change flex lines. The only change was a trick u-joint in the rear. 12 bolt yoke was slightly wider than the 10 bolt. Best of luck, John 9. ### lowlevel2Registered Member Joined: Feb 22, 2000 Posts: 10 Likes Received: 0 Location: columbus ,ohio I removed theaxle cover today and the ring is destoyed and the spider gear assm. is cracked everywhere.Ive called all the local junkyards but to no avail.it looks like im gonna rebuild or replace the axle entirely w/ another 10 bolt w/4.10 gears.sorry fellas.... but i cant afford the 14 bolt switch out....anyone got the parts i need? i live in culumbus oh. 89 SUB 75 CHEVELLE 76 CUTLASS 10. ### MICHIGAN BLAZER1/2 ton status Joined: Feb 17, 2000 Posts: 296 Likes Received: 0 Location: Middleville Michigan by the way 12 bolts did come with 3:42's...i've got one...blew my 10 bolt and replaced it about 2 months ago...luckily a friend had a 70 something 12 bolt w/3:42's....got away with the axle and him helping w/the install for$300

<font color=red>MICHIGAN BLAZER
<font color=green>89 Fullsize Blazer
87 Cherokee
65 IH Scout

11. ### KP3100Registered Member

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I just blew the rear end out of my Blazer. First off your best bet is to put another 10 bolt in or rebuild your old one. I bought new spider and axle gears from Drivetrain Direct for 200 bucks. About the rims my brother has a 78 w/ a 12 bolt and he's got 15 inch rims. I took my rear end out and rebuilt it in about a day and a half with 2 people. And last answer about your sagging, buy 2 inch blocks for your rear end.

12. ### KP3100Registered Member

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Try DriveTrain Direct they had the spider gears, carrier, cruch pin, and axle gears all for 200 bucks

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