I have a 86 k5 Silverado with most all the options but mostly swapped out driveline or rebuilt. I also have a 91 4x4 3/4 ton burb Silverado that I put a ff 4:10 axle under to replace the axle under it that developed a whine at about 70k. What is the 91 3/4 ton axle called so I can research if it is any good to put money into? I have just spent about 1k on Yukon parts and new 3:42 gears in the 86 and I used a 80 c10 12b. The 86 is on it's 3rd 700r4. It has a 350 ramjet tuned by Arizona speed and marine and a phoenix tranny with a 2 inch lift and 32's and that's a little more lift than I like for mostly hwy driving. I am in the process of building a second 4 bolt main vortec with the ranjet intake and computer that is the mefi4 config that is programable for a weekly driver burb. It has the first year 4l80e with the factory tbi now. I broke the motor, my first in about 40 years pulling a trailer on a grade wot. Probably a valve head by the sound. I know the k5 really needs a set of 3:73's but it it so little driven pulling light loads that I'm thinking I can get by with the 3:42's. I also have a 93 4x4 1500 that is gonna be the new going to hunting buggy. I have some nice 15's on the blazer and already had the late 12b and that was my thinking but with tom's axles a Yukon limited slip carrier and ring gear set with ssb rear disk, maybe it's ok but just to know if I ever need another 8 bolt set up I would still need 8 bolt front hubs and wheels and tires. The whine was barely noticible with pretty quite exhaust but probably needs a new gear set and all new bearings, I don't know if it might have the g80 or not, I didn't try to decifer the glove box stuff, I am the third owner from new on both the k5 and the burb. I also have a 96 1 ton single rear wheel truck with a good very low mileage rear axle that is 4:10 I think is right, but it is 2wd. I could use that axle but the pads seem be a different spacing from my square body trucks. I think my 86 k5 is good to go but just wanting to know what the 91 3/4 rear axle is called to research it for using later. I also have a 75 or 76 k5 that is pretty clean good floor and all, with a late model 305, and supposedly rebuilt xfer, and a clean factory dark red interior, it was a good deal and has been under the back awning on my shop several years for a project. I put the factory wheels off my 86 on it for something to set on. I would describe my jeep j200, j10 and Cherokee but that would be for a jeep forum or my scouts and internationals but you get the idea. just the axle description please.
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