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Old 02-12-2012, 01:46 PM   #101 (permalink)
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well that would work but i would need a master cylinder capable of pushing enough fluid. maybe if i used a brake master cylinder with both ports going to the slave?
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Old 02-12-2012, 03:34 PM   #102 (permalink)
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well that would work but i would need a master cylinder capable of pushing enough fluid. maybe if i used a brake master cylinder with both ports going to the slave?
Use one of the same cylinders. You wouldn't have a reservoir, but you could just make it a closed system with a T at the highest point, put a ball valve on one leg of it and a reservoir behind that.
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Old 02-12-2012, 04:00 PM   #103 (permalink)
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i guess i could make that work, just have to mount it real close to the pedal so i would have enough stroke. damn, i wish i had all these ideas a couple years ago, i guess maybe i should have made a build thread of my own...
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Old 02-13-2012, 06:07 AM   #104 (permalink)
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Anyone ever use a hydroboost brake master assembly to operate a big clutch? My wifes chief complaint about my old power stroke was the clutch effort. With thoughts of stepping up to a big boy tranny she is quite fearful that she won't be able to push it in.
I've never driven a manual transmission big truck. What is the clutch effort like?
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Old 02-13-2012, 08:13 AM   #105 (permalink)
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The clutch effort on my uhaul with a big spicer is slightly worse than your average pickup truck, but it's also fully mechanical.

I think with properly setup master/slave ratios you could make it not any worse than a pickup truck, maybe betterl, without the use of a booster.
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Old 02-13-2012, 11:16 AM   #106 (permalink)
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All the big mechanical clutch trucks I've driven had a ton of throw to have enough leverage to push on. None were hard to push down but I hated how much high up off of the floor they were. Although the clutch was more or less identical to driving a chevy with a SM465 or something similar. By comparison, the hydro clutch prostar I drove, I didn't even have to raise my foot off of the floor to push it. It was like driving a car. No effort at all. Loved it.
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Old 02-13-2012, 12:14 PM   #107 (permalink)
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The clutch effort on my uhaul with a big spicer is slightly worse than your average pickup truck, but it's also fully mechanical.
My new pull-type clutch is just a little easier than the old push-type clutch.


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Old 02-13-2012, 01:02 PM   #108 (permalink)
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All the big mechanical clutch trucks I've driven had a ton of throw to have enough leverage to push on. None were hard to push down but I hated how much high up off of the floor they were. Although the clutch was more or less identical to driving a chevy with a SM465 or something similar. By comparison, the hydro clutch prostar I drove, I didn't even have to raise my foot off of the floor to push it. It was like driving a car. No effort at all. Loved it.
x2 that

the mech. clutch of my Pete "379" (10 speed, N14 Cummins) is actually very easy to push.... what needed a lot of "getting used to" was lifting your leg completely off the floor to "stump" down on the high clutch pedal.

if i know i`m going to do some slow speed driving (like turning around in the yard and backing into the garage) i usually arrest&lock the "float" on the seat and "bump up" the air(seat) to the upper stop.... imho that makes it a lot more comfortable to use the clutch ... you have also more "feel" this way (all the torque of the N14 sure makes the Pete jump like a jackass if your clutch engagement is careless )

good thing is you hardly ever use the clutch anymore (on a non-syncro trans) if you get used to "floating" the gears
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Old 02-13-2012, 01:47 PM   #109 (permalink)
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I like to drive with the seat bumped up most of the way anway (I'm 6'5"). But the W900 I drove had this massive visor on it so I couldn't see shit out of it unless I was towards the bottom. And that made for some bad foot cramps if I spent a lot of time backing that day or in traffic that day. But for normal driving, it definitely makes you want to float it more.
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Old 02-16-2012, 09:37 PM   #110 (permalink)
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all i can do is float gears. i'm definitely going to give this hydraulic setup some more thought though. even if i do stick with air though it's better than how i drove it for the first 6 months or so, clutching with my right foot directly on the arm because i had no trans tunnel and only 2/3 of a firewall come to think of it my right leg is still stronger than my left...
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Old 02-18-2012, 05:25 PM   #111 (permalink)
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Maybe use a cable-shifter cable for it, get one with long travel and put it far enough out on levers so it has a bit less force on it.

Throwing more idears out there.
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Old 02-20-2012, 04:04 PM   #112 (permalink)
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A few questions...can we get a video of you driving this thing? Also, what is your rear gear and up in 13th what's your speed at 1800-2000 RPM?
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Old 02-20-2012, 04:54 PM   #113 (permalink)
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i bet he could rig something up with an Ebrake cable. 80s and 90s hondas had pretty short ones lengthwise.
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Old 02-21-2012, 01:23 AM   #114 (permalink)
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The clutch effort on my uhaul with a big spicer is slightly worse than your average pickup truck, but it's also fully mechanical.
As long as he doesn't step into ceramic clutch territory as the pressure to push that monster is more than the average but can take more of a beating. I had one in my Freightshaker and let me tell you...after a few months I had a pretty nice set of gams!
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Old 02-21-2012, 08:43 AM   #115 (permalink)
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Sorry Chris but I've got to say that on/off air clutch setup is just hack.


Glad to see some traffic and interest in my thread while I've been off gone and busy! I made a mechanical linkage off the stock Dodge clutch, effort is very hefty since I was limited in where I could attach things and get the throw at the clutch arm that I needed, I also have uprated springs in my clutch.

I've never put a scale or load cell on it and I'm not sure how I would but I bet my pedal effort is every bit of 150#. I've got very strong legs so I don't mind it at all, but if I go into gear early at a stop light and have to sit there it gets a little annoying. Some sort of hydro setup with adequate throw would be much nicer but I didn't have time to engineer that while doing my 1 week build.

To answer some of the other questions, I'm doing between 70 and 75 in 8th-over at 2,000 with 4.10 gears and my 225/70r19.5s. Empty, I shift 4-5-6-7-8-8o. Loaded I usually start in 3rd except when very heavy on a steep grade. I rarely split while accelerating since the Cummins has plenty of power band, it's not like the Detroits these trannies were really meant for with the high narrow power band. When I love the splits is climbing steep grades when heavy where I have to downshift and I can take that half step I so often want. I also will use the over-split around town to stay right around 1500-1800 depending on load/traffic/etc.

I recently rolled over 290k on the truck so I've had the 9513 in there for about 22,000 miles now if I recall right and I don't regret it for a second. It's a little noisier but my '97 was no common rail to begin with. Someday I'll get a tcase in there and make it 4x4 again, I look forward to that.... Too many other projects going on though.
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Old 02-21-2012, 11:21 AM   #116 (permalink)
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I want to see video from inside. Goin through the gears like u normally drive, and going through all the gears. I assume you don't use the clutch pedal except to start out, right?
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Old 02-21-2012, 11:28 AM   #117 (permalink)
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I rarely split while accelerating since the Cummins has plenty of power band, it's not like the Detroits these trannies were really meant for with the high narrow power band. When I love the splits is climbing steep grades when heavy where I have to downshift and I can take that half step I so often want.
Does that bring back some memories! When you are pulling weight on hills those 13 speeds are worth their weight in gold. And the Uhaul crowd can certainly attest to being stuck in a gear that is too high or another is too low.

I'm so grateful you did this build. Whether I save enough or one drops into my lap, I will have one someday.
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Old 02-21-2012, 11:31 AM   #118 (permalink)
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I tried to take a shifting video today by throwing my phone up in the overhead. Didn't come out so hot, I need to brace the phone in there better so it stays put. I'll see if I can YouTube it for now 'till I bother to do better.
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Old 02-21-2012, 11:50 AM   #119 (permalink)
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Here it is in all it's terribleness. Dropping sliding etc...

http://www.youtube.com/watch?v=_ynDMqKRDyM
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Old 02-21-2012, 02:07 PM   #120 (permalink)
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good run through at about 4:10, finally had a chance to watch this through.

yeah it's terrible.
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Old 02-21-2012, 02:10 PM   #121 (permalink)
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Kind of odd shifting. a lot of skipshifting. Around the 4:00-4:30 mark it looks like you went 3 to 5l to 6l to 8l than 7l and finally 7o.
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Old 02-22-2012, 09:38 AM   #122 (permalink)
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no skipping. it's an RTOO not an RTX-anything.

pattern is like this

R 1/5 4/8
L 2/6 3/7
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Old 02-22-2012, 09:46 AM   #123 (permalink)
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thought I had this up here but I guess not
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Old 02-22-2012, 09:48 AM   #124 (permalink)
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I've never seen one with the 3/7 and the 4/8 swapped around like that.

The 13 speeds I've driven (RTLO's I'm guessing) were like this.

I wouldn't think an RTOO would differ any from an RTO.

Odd.

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Old 02-22-2012, 09:50 AM   #125 (permalink)
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The Eaton literature I've read has the pattern you posted for the RTX series of transmissions. Interesting... Might be an age thing, I have no clue how old my RTOO is.
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