Axles for a 1977 Chevy Custom Deluxe Stepside 4×4?

ANYONE KNOW HOW TO IDENTIFY THE AXLES ON MY TRUCK?
I DO NOT KNOW IF THEY ARE THE ORIGIONAL
I bought a 1977 Chevy Stepside with a 350 (5.7) around a year ago and need to replace the axle "U" joint on the drivers side with the appropriate parts. Truck is used as a 4×4 mud runner.
Any help would be fantastic, thanks so much in advance!

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5 Responses to Axles for a 1977 Chevy Custom Deluxe Stepside 4×4?

  1. Justin M September 30, 2010 at 4:53 am #

    The rear should be a gm 12 bolt which can be identified by the 12 bolts on the cover they were used under the rear of Chevy pickups until 1982 as for the front it should be a Dana 44 they were used up until 1980 if it is a 44 it will have 44 stamped on the right side of the pumpkin near the axle tube it has ten bolts on the cover so don’t get it confused with a gm 10 bolt,now it is possible that it could have a gm 10 bolt up front i have seen some late 70’s pickups with those instead of a Dana 44 just check out http://www.chuckschevytruckpages.com/ there should be some axle identification pics.

  2. 4wheeler nut September 30, 2010 at 4:53 am #

    There is a tag on one of the bolts on the back of the Diff it iwll tell you what it is and what the gear ratio is. Unless it has been changed and then you have to take off the cover and count the Ring gear teeth.It is probly a Corp. 10 bolt . So if it has 10 bolts on the rear cover then so on and so forth for a 12 bolt and a 14 bolt but usally in 3/4 ton trucks. Take the U-joint with you to the parts store and it prably be a 3510 U-joint which is most half tons.

  3. paul h September 30, 2010 at 4:53 am #

    Axles usually have a small metal tag affixed to one of the cover bolts that may help identify it or you can lok for a series of numbers and letters stamped into the axle tubes. Easiest way is to remove the u-joint and take it along to match up to a new one… count the number of bolts on the axle cover and make a rough sketch of the outline of it too to help determine what style axle is in the truck. A half-ton truck could have a few different ones and it’s easiest to just go by the cover bolt pattern and shape….Corporate and Dana axles have distinctive bolt patterns and shapes. I also recommend going with special, heavy duty u-joints that have grease fittings in the cap rather than in the neck of the joint to eliminate a stress point for heavy use. Stores that cater to off-roaders or plow equipment carry them if regular stores don’t. If you can’t find one like that, make sure to install a regular style u-joint so that the grease fitting neck is under compression during forward motion.

  4. chevygirl3434 September 30, 2010 at 4:53 am #

    There is a id tag (manufactures tag) you get the numbers and take them to your chevy dealer.

  5. Steve L September 30, 2010 at 4:53 am #

    All 1973-1986 K Series 1/2 & 3/4 tons, and 1987-1991 V Series 1/2 & 3/4 tons all take the same front axle u-joint. It can be purchased at any GM Delaer Parts Department for $72.21 + tax under part number 6273940.