help me build my new axles

[K30Blazer]

Just went to 35's on my 87 Jimmy. I have the 350 EFI with a 700 R4. The gears are currently 3.42 which is too high for the tires. My truck is out of its powerband the majority of the time. Cruising around town, I am at about 1600 RPM. Great for gas mileage, horrible for power.

Currently I have a factory Posi in my 10 bolt in back. I am most likely going to a 4.10 and looking to keep the Posi and 10 bolt. Up front I am thinking of a Posi also.

Any other suggestions? Not for the gears as I am pretty sure that is what I am going to run, but for the axles themselves. Should I be considering a 3/4 ton axle or anything else?

 

[stockk5]

personally i would leave 10bolt front and if u can find a 3/4 ton rear throw that in there. thats my plan so far.. i just need to afford the re-gearing part. Mostly depends on what type of wheeling you do. Most guys on here will swear by 1ton all around locked everything but doesnt seem like thats your situation.

 

[Z3PR]

3/4 ton axle swap is very good, Should have the gears you need. Cheaper too swap both axles with matching gears then to regear. Only draw back is you'll need 8-lug rims.

 

[pauly383]

You aren't keeping the rear Posi I pray . It isn't Posi . If the axle is the original one its a Gov Loc . It will break with tires much smaller than yours . Its not a latter of if , its a matter of WHEN .

If you are going to pay to change gears , and keep your existing housing and rims , then post up in the wanted section for an open differential and an extra set of axles .

With the open differential carrier , you can run a lockright and have a pretty strong setup for a 1/2 ton axle .

There is an even better solution , but it isn't cheap . You could also get a full Detroit locker carrier .

Of course you can take the easy route , and go with 3/4 ton axles , but then you'll want to get throttle happy and break other stuff