Axle swap? couple of questions.

[broncoman6524]

Im considering doing this but im just not sure. The truck is a daily driver that is truthfully not much of a playtoy. My current gears are 3.08s in 10bs. I was considering going to the yards and raping another truck of its axles depending on the ratio. I know these era trucks (80's) came with 3.08, 3.43, but are there anyothers? BTW this is just a 10b swap Im not sure if its realy worth it to go any bigger.

Also what exactly should i do to it after buying it before i swap it in? I know to change the oil and check/repair the brakes.

BTW if this matters the truck is an 84 k5 350,400,208. Runnin 33's prob the biggest tires itll get are 38's and a hot 350 or 383.

thnx yall

 

[74757685k5]

my 85 had 3.73s 10blts

 

[4X4HIGH]

3.73's would be a good gear for you to start with. 3.73's were a very common gear in 10 bolts.

Make sure you change the fluid and i would even pull the diff cover to inspect the gears first and also to verify the gear ratio by dividing the ring gear by the pinion gear to give you the ratio but IIRC for a 3.73 it will be 41/11

If you're going to put 38's on there eventually i would suggest you find yourself a 14ff for the rear and just do a conversion to the front if it isn't much of an off road rig anyway.

 

[broncoman6524]

Are the perches the same for trucks and blazers or are they diff?

Is there anything wrong with turning the tire and counting driveshaft rotations instead of counting the teeth?

 

[4X4HIGH]

Since you have a K5 you need a 3/4 ton version 14ff and it will be a direct swap. If you get one from a 2wd truck the shock brackets hang much lower and the driver side will most likely need to be modified so it will work.

I would pull the diff cover for the two reasons i've explained above.