HID or someone might be more fluent on this than i.

I am currious if there is a 7 speed transmission out there be it spicer or Eaton, prefferably cast iron and syncronized with some form of a bolt on tail housing. and double overdrives or at least a little more OD ratio to play with.

Spicer or Eaton, but i cant find any specs on them

This is just an idea in it infancy but i am researching the ability to machine a new tail housing that will allow a larger tranny to marry upto our existing T-case and then resplining the output shaft to the appropriate 29 spline count that is needed.

next head ache would then be how to rig up the clutch. and bellhousing assembly first step first

 

Need it to work with a South Bend Clutch! It would be nice to have one of those 10 Speed Roadrangers... But it would be cheaper to get a US Gear I would think!
All it takes is money!

Rick

 

They are easy to mate to the motor with factory parts that is the beuity of an industrial engine the trannys use sae bell housings and the fly wheel housing can be chainged to sae or other bolt patterns. same with fly wheel

 

how about the hydraulic clutch system though.

Exactly, i dont think that would be an issue, might even be able to do a true dual disk setup with dampeners since the 7 spd might utilize a larger bellhousing. Down side might be that a 7speed may not shift as fast as the 5 or 6 speeds but may offer better gear splits and the potential for getting some lower highspeed cruising RPMS and a higher component torque rating which with our bombed tow rigs twins ect might mean that it would have a fairly problem free life span. well there is always wishful thinking.

10spd would be nice but i think potentially too much in most cases especially with the gear reduction box and having to integrate the air actuator 7 spd might be on the simpler straight forward shift pattern of things

I think the US gear is a good viable option, but I have always liked thinking about other alternatives just for the fun of understanding and potentially opening a new door.

Hey Rick, I was hoping maybe i could talk you into financing this one. the wife would probably support it right along with the twins. because until i get around to selling the white truck ain nothing creative from my department gonna be happening.

 

Dont Make me


Rick

 

Eaton makes a 7 speed transmission International uses it in the 4900 series trucks. One truck I drove it was called a 6+1, had a super low and 6 forward gears, I dont know if it was an overdrive unit, I dont think so. I did like the way it shifted smooth, but not fast.

 

Linetrash, i drove one just like that. But the truck was governed @55. It didnt take long to get there though...lol

 

I don't think you will find a "double over" or a choice of the OD ratio.


I would look at Fuller Transmission and see what they have.

Something like the RT610 I am not sure if they make a RTO610

The 6 is the input torque and the 10 is how many gears.
The O is for overdrive.

 

Spicer has a ESO66-7B 7sp Synchro I have driven a couple I would like to have one.

FSO 8406A Synchro-6™ Fuller don,t have a Synchro 7sp.

http://www.roadranger.com/NASApp/cs/...696251&inner=y

Yes they have a RTO610 & RTO6610 the 6610 is newer over drive is .80 on booth.

Dale

 

Spicer used to make the SST14 that was double over. Dont know if they still make it.

 

If you put in one of those monster 600lb 10 speed eaton fuller transmissions, how will you figure out the clutch pedal assembly and possibly hydrualic clutch? I dont know if any of you guys have ever driven a semi truck but the press the clutch down takes a good amount of work, get stuck in traffic and you'll hate it.

 

The RT 610 should only cost you 300 or 400 at a junk yard, they are getting pretty old. Parts are no problem. The 600 series takes a different gear to switch to overdrive, the kit is about 500 dollars. The stock RTO would not be 80 over. The factory front box overdrive gearsets are less than 80 and all the gears are different. The only way to get 80 is to convert it yourself unless you can find one already switched. The trans is no where near 600 poaunds. For 600 pounds you can go to a 913 or 9513, switch it to od in the front box and have RTOO that will give you the 80 plus I think it is 62% over for the rear box. It does not take a kit or other gears to switch these boxes although a spacer needs to be made to get the end play back in place.

I talked to someone that had installe a roadranger in his truck and he had constructed a bracket deal for the stock slave cylinder to operate the clutch on the roadranger. They do not need the big pull double disk clutch to run on our engines. My Ford LN7000 has a single disk clutch on a RTO613.

Doing the work on one is not all that hard, actually easier than some car transmissions and light truck transmissions. So far as getting OD on a manual trans, there a several out there that will do this, a couple of Clarks also. The idea is that you exchange the countershaft drive gear with fourth gear from the main drive. If the shaft sizes are the same and the width somewhere near the same you just press them off and reverse them. The RT600 series are not the same but roadranger makes the kit for it. I put the kit in my ford. The shift pattern gets switched around so that you skip fourth and go to fifth and then to the fourth position which is now overdrive. You will lose the lowest gear ratio by doing this. In otherwords, first gear will be roughly one gear higher after the change. The transmission also becomes a little harder to shift smoothly as the gears are turning one gear faster than normal, just a different feeling and if double clutching, you gotta be fast.

One day I would like to install a RTOO913 in mine. It is pretty low on the priority list though.

 

Sorry I ment the overdrive is 20% over.finnal is.80 Mine is a RTO6610 and my buddies is a RTO610
We used a lever and stock slave cyl. on the 99 superduty.
The RT&the RTO6610 weight is 357lb
RT6613 is 554lb.

Haulin_in_Dixie
Did you see the picture I posted [Towing and Hauling / RV ] of my
freinds truck.99superduty
Dale

 

Sounds like an 8LL with that weird horseshoe pattern

What a treat behind the old 290 Cummins, loaded the eyeballs.

 

Yes I did, sure does look nice. Might do one myself, I am looking for a backup rig.

.80 overdrive is 20% over... The output turns .80 of the speed of the input shaft or 20% faster. I would have to dig out all the spec sheets from when I did that stuff, but I seem to remember that a full gear turn around is .62 and the factory gear set is .80, went something like that. I know that the od on a flipped set is a BIG od. The factory made setup is only half a gear over. It is one full gear from the five speed box of the roadranger. You mentioned the weights and the reason the RTO613 is so heavy is that the double reduction rear box is the same as the early 15 speed from the 900 series. Half the weight is in the rear box. That is why I don't want to use the one I have here. I would rather just go ahead and use the RTO913, same weight class and flip the gears, would work well with the Dana 130 with the high 4 gearing or the low fives. The full air splitter would be great, easiest shifting transmission ever made. Wish they made a real 13 speed in the 600 series, it is really a 15 speed, all shifts are hard shifts. To me it would be worth the extra 200 pounds or so. Mounts would be a problem, but not too hard to solve.