I have an 83 K5 10 bolt rearend and 38.5's super swampers. Just simply driving it around in the yard i blew the readend spidergears. I would like to upgrade to a 12 bolt but would like to keep my existing 6 bolt axles. Is this possible? if so, what year ranges can i simply attach a 12 bolt in?
CK5
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12 bolt rearend
- Thread starter CWL83K5
- Start date
A 12b isnt a meaningful upgrade over 10b, just fyi. But 70’s 12bolts will bolt right in.
Your best bet would be a 14bsf from 3/4ton 80’s suburban and swap 6lug shafts from 88-98 1500 i believe with tow package. Someone else who has done swap can confirm.
Thread i started:
ck5.com
Your best bet would be a 14bsf from 3/4ton 80’s suburban and swap 6lug shafts from 88-98 1500 i believe with tow package. Someone else who has done swap can confirm.
Thread i started:
Rear axle swap/upgrade - 6 lug
Wanting to start mapping out plans for the blazer. It is going to be street driven, maybe some beach use (only after underside is treated), max tire will be 33’s or 35’s. Eventual plans are for 400-450hp/tq. Not necessarily planning on towing, but dont want to tip-toe around it if down the line...
ck5.com
What he's saying is the only bolt-in option, unless you can find an axle for sale already done. Search out the 14b s/f tech thread.
The other thing you haven't mentioned is what gear ratio you have. I understand that you probably want to keep it simple, but you should think long-term and it's possible swapping both axles to 8-lug makes the most sense. People get hung up on wheels, but buying and selling a set of wheels is not terribly expensive.
The other thing you haven't mentioned is what gear ratio you have. I understand that you probably want to keep it simple, but you should think long-term and it's possible swapping both axles to 8-lug makes the most sense. People get hung up on wheels, but buying and selling a set of wheels is not terribly expensive.
Yeah your right. its about the wheels i have id like to keep but hell i guess sell those and get some 8 lugs. just trying to stay on a budget. Dont know the gear ratio will be checking out soon once i take the ring gear off.
You can get matching set of 3/4 ton 8 lugs (14bff or 14bsf) for under $500. Most have 3.73’s or 4.10’s. People sell regeared 8lug 3/4 10b’s after they decide to swap to a 60, so could try going that route and then find rear to match front ratio (if you wanted 4.56’s or higher numerically, lower gearing wise)
I appreciate the help thank you very much
If you know the spiders are fragged, you've already pulled the cover. Ratio is stamped on the edge of the ring gear - or you can count teeth ring/pinion.
And you usually want 4.88 or even deeper with tires that size.
And you usually want 4.88 or even deeper with tires that size.
yeah i was trying to send a picture to everyone but its not letting me for some dang reason but anyways yeah i took the whole thing out but this one doesnt show the gear ratio so i just need to count the teeth or pull the ring gear off from the housing im sure its stamped there. ive read those blazers at the time either came with a 3.08 or a 3.42 nerveless its not the good ratio for the tires that im running
