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CATEGORY LISTINGS > MAINTENANCE / SERVICE > Transmission question [ REFRESH ]
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Transmission question


Created On Wednesday February 11, 2009 15:02 Diesel Talk
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JohnnyReb
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Note Wednesday February 11, 2009 15:02 View thread in raw text format
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Has anyone had any experience with converting a tranny from a 10 speed to a 13? I have looked through the Eaton website and it seems they have moved or removed all the info for conversions. I have bought and converted the 9 to 13 and don't see any reason that it won't work on a 10. Am I missing something? The tranny I am contimplating converting is a RTX14710B, pretty common tranny but I havent been able to find a kit. Also as I remember Inforanger did have a ratio/road speed/rpm converter on their site. Can't find it either. If a conversion is available I need this info to determine which rears to use. Thanks
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JoeZ
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Note Wednesday February 11, 2009 18:42 View thread in raw text format
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The 9 to 13 is a common conversion, primarily because the 13 is based on a 9 speed main box. However, the 10 to 13 isn't such a good match. It can be done, but the gear spacing isn't as even as the 9 speed. It will work with the 13 aux section and more than likely the main output gear from the 13 setup. The shaft coming out of the main to the output gear that drives the aux countershafts is the same, but the gears must all match. You can buy the parts books on the transmissions for about $5 each, and compare part numbers.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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JohnnyReb
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Note Wednesday February 11, 2009 21:50 View thread in raw text format
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Typo. I meant 10 to 15. But anyhow. Don't know where Eaton moved the info to but if anyone does please post the website. The gear spacing is what concerns me. Once upon a time Eaton had a road speed calculator on the web. You entered tranny, rears and tire rpm to show engine rpm vs road speed. I have a new set of 4.90 rears that I would like to use. I also have a RTLO14713A with less than 100K on the aux box and a ruined main case. It would make my day to be able to use this aux box on my low mileage RTX14710B.
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JoeZ
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Note Wednesday February 11, 2009 23:20 View thread in raw text format
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Are you trying to come up with a double overdrive?

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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JohnnyReb
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Note Thursday February 12, 2009 10:29 View thread in raw text format
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Not really trying for a double over. But with the B ratio that might be where I end up. That is why I have been trying to relocate the eaton speed calculator and ratio charts. Although a double over might not be a bad scenerio if I can use the set of 3:90's I have. I have a set of new, not reman, Eaton 3:90's I bought a few years back. I'm trying to figure out which aux unit I need to get a proper match. Will probably end up behind a 12.7 Detroit or maybe a N14 I have. 470 and 475 HP. I run overenghth loads, up to 130 ft. They are usually legal weight but catch alot of wind. I need to pull up to 70 MPH on occasion and would like my final drive ratio to put me somewhere in the 14-15 K rpm at 70MPH. In the past I have used the Eaton website to find the proper aux box then buy it through a local Freightliner dealer. Went to the dealer last week with this info and got a few eye rolls and then told I can't buy what I need. Although he did offer to sell me a complete tranny. The parts guy took about 30 seconds to tell me I couldn't buy a aux box for this tranny. Either he knew from his vast knowledge it was unavailable or he didn't want to take the time to look. I am thinking the latter.
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JoeZ
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Note Thursday February 12, 2009 14:24 View thread in raw text format
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You can change the back section from a RTO14713A or a RTLO14713 and put it on your RTX14710B as long as you use the output gear from the main. With the B ratio, you would have a double overdrive. To wind up with a top end of 70, you would need 4:11 or 4:33 ratio. The 3:90's would probably be in the mid to high 80's. Also, you could possibly have some gears close to overlapping, while others would be wide apart. On the 9 speed you converted, you used 5 on the low side and 4 on the high. on the 10 speed, you use 5 and 5.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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