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Old 07-31-2014, 09:33 AM   #31
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Re: want just a bit more speed

that makes sense booyah.
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Old 07-31-2014, 11:13 PM   #32
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Re: want just a bit more speed

Well, in my opinion the TH400 is the best auto tranny ever built. Despite my long use of the DTA360 and Fuller 6-speed, my real workhorse has always been my crewcab Chevy with a 6.2 diesel, Banks turbo and a Gear Vendors splitter. I had a 3-axle gooseneck I could always bring the skoolie home on if it ever needed it. The mechanical programming on the TH400 was brilliant--the smoothest shifting non-computer tranny ever. The Ford C6 and the Chrysler 727 deserve some respect, but they could not match the TH400.

I could put a 6.2 diesel and a Banks turbo with TH400 in my bus, and with all of my years of success with that equipment I know it would work. And it would allow my wife to split the driving.
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Old 07-31-2014, 11:41 PM   #33
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Re: want just a bit more speed

Wow, you're the first person I've seen to publicly speak positive about a 6.2, LOL! They were a good engine....if you got a good one. Lots were bad but the good ones were sure good. I'll agree as well about the TH400.
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Old 08-02-2014, 03:15 AM   #34
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Re: want just a bit more speed

It's like when I bought an angle grinder from Harbor Freight 20 years ago. I took it back about 7 times. They guy told me, when you get a good one, it will be good.

It wasn't, but the 6.2 was what he was really talking about.

There are lots of 6.2 bashers. It deserved its reputation early on. But it did pass a rigorous regime of testing for the military to accept it--it is not a 350 Chevy converted to a diesel as many people believe. It is a confession by Oldsmobile that they don't know a damn thing about diesels. The engine was designed by Detroit Diesel to fit into the space occupied by a 454 with all of the accessories, mounts and transmissions--though the transmissions have internal differences. My truck is an '88, late in the run, and the problems were probably sorted out.

Another respect often denied to this engine is longevity. This engine is still being produced 33 years on. It's been 6.5 liters for about 20 years, but the parts all interchange. All of the faults have long been corrected.

http://www.amgeneral.com/vehicles/gep/s ... ations.php

In fact, you can buy a new one that will compete with a new Duramax, Cummins or Powerstroke.

http://www.peninsulardiesel.com/WP-PENTEST/?page_id=322

What other engine has a 32+ year history--and still going strong? What a lot of people think of as the worst engine ever is probably the best engine ever. When whatever the current design of your favorite engine is changed--check back and see if the old Detroit Diesel 6.2/6.5 isn't still being produced. It will be. It was a brilliant design that needed a few more bucks spent on the materials.
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Old 08-02-2014, 11:50 AM   #35
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Re: want just a bit more speed

Agreed!

I've never had issue with Harbor Freight "junk". All the electrical tools I've got from them, spare brushes included, have been fine. Well worth the low price, unless you depend on them daily for your trade.
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Old 08-10-2014, 04:02 PM   #36
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Re: want just a bit more speed

I have an AT542 behind a T444, and drive through the mountains. That trans sucks for my application, and my experience agrees with all of the informative posts in here about it not letting the engine climb hills at peak torque, and the heat that it produces is a big problem.

So, I've considering swapping just the torque converter for one with less slip, or even a different auto with a lock up converter. However, it seems most lock up autos only lock in the top gears, which doesn't fix the problem of intense heat production/power loss when climbing hills.

Now I'm thinking of possibly swapping in a manual transmission. Do you guys have any recommendations? My first thought would be a basic 5 speed from an F350 or something. My bus GVWR is 16,500, btw, so not real heavy.
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Old 08-10-2014, 04:08 PM   #37
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Re: want just a bit more speed

Make some calls and find whatever manual transmission a bus with that engine would use. Might as well have a bolt on setup.
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Old 08-11-2014, 09:22 AM   #38
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Re: want just a bit more speed

Quote:
Originally Posted by opus
Make some calls and find whatever manual transmission a bus with that engine would use. Might as well have a bolt on setup.
I'll second, third, and fourth this statement. You're going to have to fabricate/engineer things to get them to work anyways. You might as well put something in that will work with the least amount of fabrication.

Most of your light duty trucks will use a New Venture transmission. Either the 4500 which is a 5 speed or the 5600 which is a 6 speed. If it's a Ford, it'll be a zf6. Although all of these transmissions would work, I'd be leery of using them. They're just not designed for use in a school bus. Plus you'd likely have to get some sort of adapter housing in order to mate the trans to your engine.

*On edit, with the T444E you might be able to easily fit a zf6 in there seeing how they used that behind the 7.3 powerstroke in ford trucks. Might even be able to use a hydraulic clutch. Although they're less desirable, it would make it even easier to mount in a bus.
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Old 08-13-2014, 09:45 PM   #39
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Re: want just a bit more speed

From what I can find the ZF6 weighs 235# and the F5406 Fuller in my bus weighs 360# and they are both rated at close to the same torque. The difference, I'm sure, is duty cycle. A Powerstroke light truck might occasionally test that tranny, but a bus with its massive frontal area lives at full torque. That your bus is lighter might help, but the frontal area is more important in my opinion. I don't know if I've posted a rant about being beaten by semis even though I have double the power-to-weight advantage. The fact is, the weight matters a lot during initial acceleration, but at some point the wind resistance becomes much more of a factor. Having a lot more gear than I have engine, my bus should be capable of close to 100mph, but it can't reach 80. A semi, 4x heavier and with 2.5x the power, will absolutely blow my doors off--unless we hit one of those 6% grades where the weight spikes as a factor--then I can get them.

I think that if you actually got down the the moment of installing that ZF tranny, once you see the comparison in the u-joints when you try to make the driveshaft work, you won't be inclined to do it anymore.

http://www.dieselhub.com/trans/ZF-S6-650.html

http://www.roadranger.com/ecm/groups/pu ... df#page=25
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Old 08-13-2014, 10:32 PM   #40
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Re: want just a bit more speed

I agree completely with what you said Will. However with his gvwr only being 16500 lbs, I don't think a medium duty trans is necessary, and a school bus would have about the same wind resistance as a one ton truck pulling a tri axle fifth wheel camper, and a ZF can handle that all day long. I'm going to stick with the zf6 because I think it will handle the environment fine and I have a feeling finding and installing one of them will be easier and cheaper for him than any other option. My opinion FWIW
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