Junkrat55

I think it's just the picture. Bearing on the primary was still "good" I wish I would have had more warning than I got. It started growling only a few miles before it actually went with a bang and a shudder. Just long enough to know what I was hearing. Yeah, thank God 4th is direct drive. Glad to hear you got your truck home and fixed so quickly. Wish I had a spare transmission laying around.

You mean after the tow would have needed to drive 50+ miles to get to me? I live remote and I wasn't anywhere where I could call a tow. I was a few miles from even having cell service or other another person, and I wasn't going to walk an hour or more in the dark hoping someone might drive by or get to someone's house. If it drove, I was going to drive it as far as I could. It would have needed a rebuild regardless, which between a tow and the shop rate, it'd be easiest to put a new transmission in. Now I have an opportunity to put a better, stronger transmission in. It was worth more to get home rather than turn it into a 4 hour ordeal in the middle of the night.

Red cloth is just a shop rag stuffed in the drain hole since it was still trying to dribble oil on me when I was pulling the trans out. https://imgur.com/a/99CB8 Countershaft bearing destructed pretty much like I expected https://imgur.com/a/PjMhk Countershaft is completely toast. 5th gear completely sheared off the shaft. Can't say I've seen something like that happen before. Ps. Stupid question, but how do you link pictures instead of hotlinks?

Finally got the chance to tear into my truck this weekend. Found this when I got the rear bracket pulled off. https://imgur.com/a/4vde4 Knew it was going to be ugly, but didn't expect it to punch a hole through the rear housing. Guess that's what happens when you run it 20 miles to get home after it blows. Didn't really have a choice though. Thank God for 4th gear.

Thanks, Mike. Sounds like I'll probably have to get some drive shaft modification done. I can probably make something work for the rear mounts. Guessing I'm going to need a longer speedo cable? Any guess if the 71C will affect speedo accuracy or if I can fix that? Do you know if it will change the position of the shifter? I'll have time in about two weeks to tear into it. Just trying to think ahead on what I need to be prepared to deal with.

So, my transmission went out in my '85 KC 4x4. Seeing as 4th is the only gear that will work without the truck clunking and lurching, guessing the bearing on the countershaft fell apart. I've checked around the local junkyards here and none of them have anything from a 720. Even asked about anything out of a 240 or a 300 and no dice. I can only take them at their word since they don't actually let anyone in the yard to look. I may be able to come up with a transmission out of a D21, though. Are those transmissions swappable? Is it just a case of reusing the front half of the case from the 720? I know they're "the same transmission," b VS c model, but I want to make sure it's doable without a bunch of fab work needed. If the D21 will work, that might be the best since it's got better gear ratio for running on the highway I believe. Need to get it fixed ASAP with winter coming as I'm rural and we're not exactly a priority for the plows. Thanks in advance.