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Old 08-31-2009, 09:37 PM   #1 (permalink)
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Which is the smallest and lightest 13 speed ? 10 speed ?

Who makes the smallest and lightest 13 speed transmission ? What is the model number and is it an OD transmission ?

I'm thinking about the 13 speeds that came behind the 427 gassers in the Chev C65 trucks. What model is that ?

What is the smallest and lightest 10 speed ?

Thanks
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Old 09-01-2009, 07:16 AM   #2 (permalink)
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I'm thinking about the 13 speeds that came behind the 427 gassers in the Chev C65 trucks.
I think you'll find there's no such thing---there's only one size. 13 spd Roadrangers were all behind big engines (Cummins, Detroits, Macks) and mated to the larger SAE bellhousing. Same with the 10 speeds. The only small Roadranger to my knowledge was a 9 speed which was available in mid duty trucks. No such thing as lightest, they're all heavy, wide, and long due to the twin countershaft design and hi/lo range section plus OD/Direct on the 13's. In fact, unless you don't care about pinched fingers, you use an overhead hoist with a piece of rope to lift the mainshaft and countershaft gears out of the case.
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Old 09-05-2009, 11:42 AM   #3 (permalink)
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Do you know the nomeclature? Someone can explain it if not, I will skip it now.

There was some discussion on this a while back somewhere, I think RT613 and RT6613 were the old lighter weight ones. I think there is a RT610 out there too.

What are you trying to do with it?

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Old 09-09-2009, 05:21 PM   #4 (permalink)
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After some research, I have found that the smallest 10 and 13 speed transmissions are the rt/rto 610,613 and 6610 and 6613. That is all I know right now, except that they are significantly smaller than a regular 10 and 13 speed transmission.

The 6610 is supposed to weigh 367 pounds. The 6613 weighs something like 500 pounds. Don't quote that number. Its heavier because it has 3 ranges instead of 2 and the bottom range is double reduction. It doesn't shift like a regular 13 speed. Or so I am told.

I have a special project in mind for a modified 610 or 6610.

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Old 09-09-2009, 09:03 PM   #5 (permalink)
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Do you know the regular 13 speed and the 15 speed?

I think the 613 is like the regular 13 speed in that you shift through the low side like a 9 speed. Then when you get to the top 4 you may split each one.

The 6613 is more like a 15 speed in that you rarely use the extra deep reduction range that it has. You start in the middle range and then shift to the top range like a 10 speed when on the road and the deep reduction can be engaged as necessary and is not normally progressively shifted. You do not "split" any gears with this one. In my opinion, a less desirable transmission in most cases. The difference between it and the 15 speed, ratio wise, is only in the deep reduction and only that with the 15 speed, your deep reduction is 2 gears below low range; with the "strange" 13 speed, it is 3 gears below. By this nomenclature a 15 speed would be properly called a 12 speed. It is very confusing, I know.

See <this page> for the operators manual, still available. The other 10 and 13 I'm sure you already know.

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Old 09-18-2009, 10:36 PM   #6 (permalink)
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Put One in a F450?

So if one wanted to install more than a 6 speed in a F450 what would be a realistic choice?

Anyone done this before?

I just lost my second 4R100 in my F450 and am thinking about going manual. Not sure if the standard 6 speed be strong enough: My F450 weighs 11,000 and my loaded horse trailer weighs around 15,000. The mountains out here in the Pacific NW are Transmission killers. I would love to have a 9 or 10 speed but my guess is they are too big to fit. Maybe a 5 or a 6 speed from a MDT.
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This F450 will be replaced with a heavier truck, maybe a Freightliner or a Peterbilt around 25,000 GVW. AND with a big manual transmission.
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Old 09-19-2009, 11:20 AM   #7 (permalink)
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The RT or RTO610 would be the one to look for to put in a pickup. It's been done. You would just need to adapt to an SAE bellhousing, which isnt hard for a powerstroke.
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Old 09-19-2009, 12:15 PM   #8 (permalink)
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You better do some serious measuring first, they're not real small. In addition to being long do to the range shift section, they're very wide due to the twin countershaft design. Then you have to contend with input shaft length, different sized pilot bearing (machining the flywheel recess bigger if possible), matching input shaft splines to clutch disc splines, an air supply, rear trans support, etc. There's a heck of a lot more involved than rounding up an SAE bellhousing adapter.

On Edit: Can't remember, but if that series is like the bigger ones, they are designed to be behind a double disc pull clutch so that would require different linkage, etc, etc.
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Old 09-19-2009, 01:24 PM   #9 (permalink)
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On Edit: Can't remember, but if that series is like the bigger ones, they are designed to be behind a double disc pull clutch so that would require different linkage, etc, etc.
You are probably familiar with the same ones I'm familiar with, you must be old too. I believe it was the RT-910 and RTO-913 roadrangers. I've overhauled few 910's but never a 913. I don't think there is any way one of those is going to work in an F-450 behind a Powerstroke. I know nothing about any of the other models.
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Old 09-19-2009, 08:36 PM   #10 (permalink)
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Originally Posted by LMJD View Post
You better do some serious measuring first, they're not real small. In addition to being long do to the range shift section, they're very wide due to the twin countershaft design. Then you have to contend with input shaft length, different sized pilot bearing (machining the flywheel recess bigger if possible), matching input shaft splines to clutch disc splines, an air supply, rear trans support, etc. There's a heck of a lot more involved than rounding up an SAE bellhousing adapter.

On Edit: Can't remember, but if that series is like the bigger ones, they are designed to be behind a double disc pull clutch so that would require different linkage, etc, etc.
There's a guy by the name of 2Wpuller on some of the other forums that has an RT610 behind a 6 litre Perkins in a 75 F250.
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Old 09-19-2009, 09:09 PM   #11 (permalink)
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I searched him out, boy that is a beautiful job on his conversion. 6.0 twin turbo Perkins backed with an RTO 6610 10 speed, home built full air ride.

Very nice.


Truck.


Truck full view


Engine bay


Transmission from the rear, I imagine this is the one you want to see.

If you google his user name +perkins +f250 you will get to several sites he is on. Some folks just have too much fun. I would imagine if you run him down where he is posting he would probably be glad to offer his insight with regard to what you want to do.

He did say in one thread he finally took it on enough of a trip to see what his fuel economy was - 24.8 mpg. Fun and environmentally friendly to boot!

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LINK TO LIST OF THE FALLEN



'95 F250 ext cab long bed, PSD, 5 speed, 2 wheel drive, 3.55 gears, 286,000 miles, Edge Evolution CTS (LINK TO MY REVIEW), LUK clutch, homemade REAR BUMPER, open element AIR FILTER, 36" ARE contractor cap. With tools, full of fuel and me on board (300 lbs) steer 3620, drive 3860 total 7480.

Last edited by Believer45; 09-19-2009 at 09:15 PM.
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Old 09-20-2009, 09:53 AM   #12 (permalink)
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Believer, your pics didn't work but I searched like you suggested and found a few pics. Pretty slick, nice truck.
All I show in your post is boxes with the red X, maybe it's my computer, it's doing been some wierd stuff the last few days.
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Old 09-20-2009, 03:17 PM   #13 (permalink)
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I got the red X too, but I've seen his rig. Real nice guy, his name is Dale(mine too). There's actually parts you can buy to make an RT into an RTO, so you arent limited to a direct drive. He also said it shifts super easy and smoooth. They arent all that much more expensive than a New Venture 5600, if you look thru the truck bone yards.
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Work truck:'94 IH 4900, DTA466 lightly bombed(#0 fuel plate, timing at 22*, 3 clicks tighter gov springs), Allison MT653, Voith retarder, and straight piped
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Old 09-20-2009, 03:28 PM   #14 (permalink)
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Odd, pics work fine for me.

Do you both have "VIEW IMAGES" checked in your profile?

In your profile, under Control Panel on the left,
Settings and Options
Edit options
Thread display options
first group, third choice make sure VIEW IMAGES is checked

Dave / Believer45
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THANK YOU to all the heroes in our military and all the heroes at home who wait for their safe return. I am humbled by and grateful for your service and sacrifice.

LINK TO LIST OF THE FALLEN



'95 F250 ext cab long bed, PSD, 5 speed, 2 wheel drive, 3.55 gears, 286,000 miles, Edge Evolution CTS (LINK TO MY REVIEW), LUK clutch, homemade REAR BUMPER, open element AIR FILTER, 36" ARE contractor cap. With tools, full of fuel and me on board (300 lbs) steer 3620, drive 3860 total 7480.

Last edited by Believer45; 09-20-2009 at 03:35 PM.
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Old 09-20-2009, 06:17 PM   #15 (permalink)
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Yes, thanks, mine is checked. I most always get images but every once in a while someone's pic will just appear as a box with the red X, especially if it's a really old link.
Quote:
There's actually parts you can buy to make an RT into an RTO, so you arent limited to a direct drive
Yea, I'm hazy on that because I never converted one, but IIRC you just press off two countershaft gears and X them with two mainshaft gears basically. It can be done that way to a few truck gearboxes.
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Last edited by LMJD; 09-20-2009 at 06:36 PM.
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