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| | | | Joined: Apr 2002 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 146 | I've decided to put a mid 70's 12 bolt under my 54 half ton. Question is when I find a donor truck in the junk yard, how do I know what ratio and type gear is in it? Any help would be appreciated.
if it dosen't need fixed, break it
| | | | | Joined: Mar 2002 Posts: 28 Member | | Member Joined: Mar 2002 Posts: 28 | Look for a tag on the rear cover. If it is still there it should list the # of teeth on the ring and pinion as well as the ratio (410 = 4.10, 373 = 3.73, 41-10 = 41 ring gear teeth/10 pinion teeth = 4.10 ratio) | | | | | Joined: Mar 2002 Posts: 28 Member | | Member Joined: Mar 2002 Posts: 28 | If the tag is not there pull the rear cover and look for the #'s stamped on the ring gear (you want to check the condition of the gears anyway). It will be in the same format as the tag on the outside (41-10 = 4.10) | | | 
#1348 05/22/2002 12:11 PM | Joined: Apr 2002 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 146 | OK Thanks for the info. Could some one tell me how to get the axles out? I've been told to check the axles before I buy.
if it dosen't need fixed, break it
| | | | | Joined: Feb 2000 Posts: 5,200 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,200 | To get the axles out you have to get inside the unit. Pull the cover and let the oil drain in to a bucket or pan. You will need the rear tires and brake drums off. Rotate the carrier around till you see a small headed bolt pointing towards the ring gear. Remove it and don't loose it. Sometimes they are broke off at the threads. This bolt/pin holds the center spider gear axle/pin in place. You may want to take some small picks and small magnet in case the pin section is broke off. You may get lucky and it will screw right out, if not work it with the picks and magnet. Once you get it out, slide the pin out and rotate the two loose gears around till they fall out. They are the same so don't worry about mixing them up. Next push the axles towards each other and the C-clips should fall from the ends of the axles. They are called C-clips because they look just like a C and they hold the axles in. When they fall out just pull the axles out and check for wear at the outer wheel bearing. It should be slightly dull grey and could have small dents in it. If it has chips or a scored area keep looking. Also while you are there check the spider gears for wear and check the ring gear for wear. If they are chipped or worn sharp, keep looking. If you need more information just ask again. Joe | | | | | Joined: Apr 2002 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 146 | Thanks; Now I'm off to the junk yard to wear out my welcome.
if it dosen't need fixed, break it
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