I have 460 7.5L gasoline engine on a RV. After driving 300 miles straight and the front start smoking and I pulled over and saw the transmission fluid just shooting out from right in front of the trans oil pan, hot and steaming. Also saw the trail of oil a mile from where I stopped. All oil are gone. Next day go back and put in 2.5 gallons of oil until I see the oil dripping down the bottom. Drove to Aamco transmission, 12 miles down in 20 min. Nothing happen, not a drop coming out. I left it there in the parking lot on Sunday. Today the shop called and said they found nothing wrong. They said I just overfill it and they drain down 1.5 quart, it is all fine now. Then I told them the story. I said the oil were shooting out and all empty out. I put in 2.5 gallons , not quarts. They said it didn't make any sense. I don't know what to tell them. Anyone know what could happen. The RV is still in his shop and he said he will look at it more and see what he find.

 

Front pump shaft seal probably got hot and puked. Once it cooled down, it sealed back up.

Need's a new Viton seal, probably. The seal is only a few bucks but you have to pull the transmission to replace it. You'll also probably need to work on the cooling system for the tranny, while you're at it.

 

I'd personally steer far clear from aamco shops. There may be a few shops in their franchise that are reputible but If you do som reading on the company (cottman is also owned by aamco) you will shake your head in disbelief and realize the odds are against you.

Sounds like trans overheated and puked. Probably at least need a fluid change and possibly have a bigger oil cooler installed. Find a local shop that comes with good references from your friends to do the work.

 

projectSHO89, thank you for the reply, It seems reasonable from what you describe. I suggested to them may be because the heavy load with water tank full and 8 people in the RV, may cause overheat and some seal broke. He just keep saying it didn't make any sense. Well, if the seal pop back in when it cools down. Is it possible that it sit back totally back in place then I just need to improve the cooling system, change fluid (already did since it all leaked out), change larger cooler, etc. How much work to replace the seal. Anyone done it themselves before. I have done all kinds of large job but never on the transmission except change fluid and filter. Is it difficult or just hard labor? Or if it drive fine, the seal may not need to be replaced?

 

I had the same thing happen to me in a '91 Ford Ranger pickup. Mine was probably low on fluid to start with and I was overloaded on weight going up the mountain. It finally blew enough out that it didn't want to go any more. I let it sit for about an hour, added maybe four quarts and limped it into the nearest town.

I then had it towed back to my house and had the transmission rebuilt. What I SHOULD have done is drain/fill the fluid a couple of times to clean it out and then see how the transmission behaved. The guy that rebuilt it said that the internals looked pretty good. Reverse gear never worked right after the rebuild.

 

Read previous reply, already answered.

 

projectSHO89, thank you! When you say pull the trans. I assume it means disconnect the axles, then took out the ten something bolts around the trans and pull it straight out, then peel off the seal and replace with a new one and put everything back in. If it is, then it shouldn't be that bad, except that I need a jack or something to support the trans because it is heavy and I will be working on the ground, not like the shop has a tunnel underneath.

 

I think that is fairly common with these transmissions. They will leak hot and then recover. A new seal couldn't hurt, but I am not at all sure it'll solve the problem 100% either.

When you remove the transmission, in addition to what you are talking about above, you will need to take the bolts out of the torque converter. That allows the transmission to slide back about a half inch and then drop straight down with the torque converter still in it. Less abusive.

 

I had an old 250 did the exact same thing with the old AOD trans and after cooling down and refilled it I was back on the road. Unfortunately 4 months later the pump failed. Take it to a different shop and have it looked at. Some times they're fine but error on the side of caution. Hate to take the risk and get stuck some place.

 

I meant you have to REMOVE the transmission to access the seal. The torque converter has to come off, the seal is between it and the input bulkhead of the transmission housing.