for a working truck, it just takes some getting used to, and really you need a pretty big engine, because it would be useless with a small engine say under 400 hp unless it was really geared to the drit, i mean you would probley never get it in the big hole loaded and probley be in your direct gear alot. But anyway, as far as it being a bad trans. I have herd of people putting a rto13 speed back box on a rtx1469b trans but you have to buy the main gear because a direct trans and a overdrive trans have a difrent gearmess on the back. The tranny worked good the only fault i had to it with loads like that and the places i had to bring them out of it did not really have a good low hole but it would pull out with what ever you put on it's back, just a little harder on the drivetrain and clucth. The truck had tall 24.5 rubber on it also and many times it grossed over 100,000 lbs pulling a pitts 40 foot log trailer and to be honest probley close to 120,000 grose a few times. The trans did not give much trouble althougth it did get built once because it was making a lot of nosie and he just didn't want to blow it apart. Well i drove a superliner with a rto15613 that was fliped, and it had a 3406b cat in it. Get the parts books out and compare the difference in a RTO and a RTOO. I know your going to hear guys that has done it and like it but i have seen it done and built one for may self and did it from the parts that is used from the factory to build right nd that is the only way to go. Many have taken a RTO and flip th front gears and built RTOO but in the end they hate their self if its a truck you live in ever day. The RTOO14613 and the RTO613 have many different geats from each other. How ever you can come up with a RTOO by using a 9 speed o/d front and a 14613 rear but with the RTOO you may have some messed up splits unless you change some gears out. You can put most 12513 rears box as well as a 14613 box on the rear of a 9 speed o/d or d/d. You can find a RT or RTO 9 and 10 speed but the RT will be direct in the front and the RTO will be over in the front. The RTLO will be direct in th rear with ubdrive and then the over drive will be in the front but thses are different boxe from the RTO In the older trans any RTO11513,RTO12513,RTO14613,Or 613 will be over drive in the rear but direct in the front. I know 13/15 and 18 are under back boxes, I think 8LL is under back box too, what has an over back box? I can't actually remember but I didn't think there were many od back boxes, I know any 9 or 10 spd based trans is od in the front, which ones are od in the back if I could find an od back box I would swap the shafts and put it on my 9 spd to get my double od. You can do that with a dab of paint on one tooth, does not matter where you start, count the teeth divide by two and mark the other side, You need the same number of teeth on each side of your marks. Before reassembly, mark the new head gear for timing purposes. If I have confused you, You must remember that you changed the order of progression on all of the sub assembly's. You will also need a need a new 5th gear with the same number of teeth as the old 4th. This is due to differences in machining, as the head gear and the input shaft are locked together with a snap ring. In your case, you will probably have to buy a new head gear, with the same number of teeth as the old main shaft 4th. On some of the really old Fuller transmissions you might be able to swap places with the head gear, or main shaft 5th and main shaft 4th. Counter shafts are timed to the main shaft, Looking at the front of the counter shaft and using the key way for a guide, remark the counter shaft for reassembly. Due to PTO issues, identify the counter shafts as to left and right when you strip the transmission, and make sure they go back in the same place. How easy it is depends on what you have to work with. They are keyed to the shaft so that part is simple. 4th and 5th speed gears have to be pressed from both counter shafts.
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