Something is broken
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Junior User
Joined: Feb 2010
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Something is broken
I am need of some help here guys. I have an 86 F250 4x4. I pulled the sled with it last week and at the end of the run I broke the yoke at the rear end. Bent the driveshaft too. I am running a rear end from a 97 with 4.10 gears and limited slip. I replaced the driveshaft and yoke. Last night after driving forward prolly 500 yards the trucks stopped abruptly with alot of grinding and clunking. It will back up fine. The rear pinion is moving in and out about 1/2 inch. Can the limited slip go bad and cause this? We removed the driveshaft and had it still locked up tight. We had to back around the block to get it back in the garage. When you jack the rear wheels off the ground and roll the wheels forward it will lock up tight. This morning I changed the front bearing and crush sleeve. Back out of the garage and went to move forward. Grinding and clunking again. There are no broken teeth. I am lost here so any help would be great. TIA
PS... When I broke, I was towed back to my trailer with no issues or noises.
PS... When I broke, I was towed back to my trailer with no issues or noises.
Posting Guru
Joined: Oct 2011
Posts: 1,179
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From: Pueblo, CO
So even with the drive shaft disconnected, if you rotate the wheels it grinds and locks up? IF there are no teeth sheared off the pinion or ring gear then I would think it would be in the differential itself.
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Junior User
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Here is a little more info. II swapped the whole old rear end back in this morning. Then I installed the ring, pinion and lsr carrier from the other rear end. I have the rear jacked up now and when I turn the rear end it turns just a bit then locks. The pinion appears to be hitting the carrier.
Elder User
Joined: Jan 2012
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From: Norman, Ar
I am saying this as he put that assembly back in the old rear end.
Detroit Locker in GM..
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
if the pinion is moving in and out that much it probably got sucked into, and took out the carrier.
4.10 LS Sterling's are pretty common.
Probably time & money ahead just to swap the whole thing out.
4.10 LS Sterling's are pretty common.
Probably time & money ahead just to swap the whole thing out.
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Junior User
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The rear is a 10.25. The carrier does have some digs on it where the pinion hit it. The bearing was out of the 1st one. Prolly didnt help it when the yoke broke. It was a huge bang. lol. When I put the 86 Sterling back in the pinion from the 97 was a long snout pinion. I had another 4.10 ring and pinion in the basement and that one was a short snout. No one around here had a crush sleeve in stock, and I was trying to make an afternoon pull, so I just snugged up the old one. I ended up not getting it tight enough and that let the pinion fall back and tick the carrier. All is tight now and there is no more grinding. I missed the pull but there is another one next saturday.
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Posting Guru
Joined: Jul 2010
Posts: 1,154
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From: Marysville, WA
Might be time for a Dana 80 out of a Dodge. If you are going to be pulling that much, go heavy and strong.
And for those that wonder about the TTB... Gus seems to be doing well with it, especially doing sled pulls. The rear broke before the front.
And for those that wonder about the TTB... Gus seems to be doing well with it, especially doing sled pulls. The rear broke before the front.
Logistics Pro
Joined: Jun 2008
Posts: 4,990
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From: Florida
Something similar happened to my buddy's 02 F150 4x4 before he bought it.
We didn't realize it until he broke the lug studs on his axle one night going down the road, and his wheel went flying. When we opened the diff cover to pull the shaft pin out so we could pull the axle, we found deep gear marks on his differential. Somebody replaced the pinion bearing, pinion gear, and ring gear, but re-used the chewed up carrier.
Neither of us had ever seen anything like it before.
We didn't realize it until he broke the lug studs on his axle one night going down the road, and his wheel went flying. When we opened the diff cover to pull the shaft pin out so we could pull the axle, we found deep gear marks on his differential. Somebody replaced the pinion bearing, pinion gear, and ring gear, but re-used the chewed up carrier.
Neither of us had ever seen anything like it before.
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Junior User
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There are 2 guys running 80s out of Dodges in their Fords. Both of them have busted yokes as well. The last one twisted the spring perches and the nose of the 80 was pointed straight up at the box. We mostly pull on very heavy clay tracks and the sled is really dropping the pan hard on us. I will put 1410 yokes on this winter and I will be dropping my hitch height a bit to lessen the load on the rear. They normally have us or diesel stock pull 1st to make a path for the higher hp classes.
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