03' Big Red Posted September 14, 2016 Share Posted September 14, 2016 I have heard that one could reverse the two top gears on a Eaton 13 speed to make this a double over drive.. Anyone have any input on this ? Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/ Share on other sites More sharing options...
BillyT Posted September 14, 2016 Share Posted September 14, 2016 Big Red, I heard that as well,but a truck mechanic told me it's b.s.,He ran a well respected shop so I don't know,mechanics are human too! Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345665 Share on other sites More sharing options...
carlotpilot Posted September 14, 2016 Share Posted September 14, 2016 it is possible to do but the result is not worth the effort. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345667 Share on other sites More sharing options...
jkruss82 Posted September 14, 2016 Share Posted September 14, 2016 Rear section countershaft gears are welded on the shaft . That would take some effort. Not sure how you could change around any other top two gears??? Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345687 Share on other sites More sharing options...
theakerstwo Posted September 14, 2016 Share Posted September 14, 2016 You flip the top two gears in the main box but again its a messed up on splits.I have seen it done and i know others have to but again its not the same as a rreal RTOO.I have flip many top two gears on a ten speed but ever one hates their self after it done.Back years ago when guys wasup dating their engine with turbos now they wanted a little more speedwith the 4:11 ratio rears so this was what so many tryed.The rear box is left along. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345699 Share on other sites More sharing options...
TeamsterGrrrl Posted September 14, 2016 Share Posted September 14, 2016 You'd be switching the next gear down from direct to an overdrive, so you'd end up with a huge gap between two gears down from direct and direct. Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345700 Share on other sites More sharing options...
carlotpilot Posted September 14, 2016 Share Posted September 14, 2016 (edited) I agree with ts you can`t do it with just a13 spd you need parts from3 different transmissions .and I would not attempt it. what you wind up with is for all intents & purposes unusable Edited September 14, 2016 by carlotpilot Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345703 Share on other sites More sharing options...
theakerstwo Posted September 14, 2016 Share Posted September 14, 2016 The RTLO has a od in front box already.It has two over drives as final ratios but a RTO can be changed to a RTOO but has messed up splits.To do that its got to have the top two fliped including the counter shaft gears.When you do that you now have three od ratios.The difference in a RTO and RTLO is one has the od in the rear box and the other has the od in the front box. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345708 Share on other sites More sharing options...
Truck Shop Posted September 14, 2016 Share Posted September 14, 2016 One real big question --------------If you flip the two top gears, then which one will accept the input shaft. Because only one is machined to accept the input shaft. Truck Shop Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345713 Share on other sites More sharing options...
theakerstwo Posted September 14, 2016 Share Posted September 14, 2016 On a RTO 9513 12513 14613 both will change out.If you saying the gear is made on the shaft it is not. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345718 Share on other sites More sharing options...
theakerstwo Posted September 14, 2016 Share Posted September 14, 2016 This can be done with a 10 speed or 15 speed also and maybe not after you get into the 713 back box trans or a 715 back box trans.I think on the RTO 15713 the gear were the snap ring holds it on is different. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345719 Share on other sites More sharing options...
VT Mack Posted September 14, 2016 Share Posted September 14, 2016 I have an RTOO 9513 in my 1973 Ford LT9000. I bought it in June and it had a regular 13 speed shift pattern on the knob, it took me about a half mile to figure out something was up! I flipped down the sunvisor and it had the box shift pattern which takes a bit to get used to. Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345723 Share on other sites More sharing options...
bts-4120 Posted September 15, 2016 Share Posted September 15, 2016 actually a 13 spd is already a double over you wanting a triple over. if you could get it done its going to mess with your reduction on the low side Quote Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345734 Share on other sites More sharing options...
theakerstwo Posted September 15, 2016 Share Posted September 15, 2016 You are talking now about a RTLO being a double OD.A RTO is only a single OD. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345744 Share on other sites More sharing options...
theakerstwo Posted September 15, 2016 Share Posted September 15, 2016 (edited) I need to back up on a statement of mine bout the flipping the top two on a RTO14613.I dont remenber if i have seen it done or not. If it can be done its still not a good trans. Edited September 15, 2016 by theakerstwo Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/46846-eaton-13-speed/#findComment-345828 Share on other sites More sharing options...
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