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Old 09-28-2018, 07:32 PM   #1
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New to the 6.6 and 545 Allison

Hi all, I just purchased an f350 that the previous owner installed a 6.6 Brazillian and an Allison 545 out of a school bus into. Anyway, he tried to use a 4 speed manual behind the Allison as a divorced overdrive and the drive train has a bad vibration at anything over about 50. I am thinking that the vibration is coming from the divorced "overdrive" transmission and I am probably going to remove it. The truck has 4.10 rear end gears and stock sized tires. I am wondering if anyone could tell me 1) Will I be able to run 60-70, and 2) How will it do pulling a 7000 lb fifth wheel. I have been looking for information all over the net, and it seems as if everyone here may have the answers I am looking for. Thanks, William. Here are some pics of the Green Gobblin.
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Old 09-29-2018, 09:41 AM   #2
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I saw that truck for sale on a different site. I thought it was a neat swap. Anyways, your vibration is likely something else then the 4 speed auxiliary transmission. Check out your u joints and the angles their operating at. After you've done that, have the driveline balanced if it still shakes. Heck, make sure the tires are in decent shape.

It should be able to do 70 without a trailer behind it. It won't be a sports car by any means, but it will get you there. Not sure how it will do pulling a fifth wheel. Biggest issue you'll have is the at545 having a non-lockup torque converter. They don't do well at low rpms which is what that 6.6 is.
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Old 09-29-2018, 11:08 PM   #3
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Thanks Booyah. I got to looking at the driveline, and I think it is the angles on the final driveshaft, it has short and at quite an angle. i haven't checked the exact angle yet, but its pretty steep. Does anyone know what the optimal angle for a driveshaft is. Thanks again
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Old 09-30-2018, 08:21 AM   #4
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With custom driveline work having been done I would also check the driveline U-joint phasing. You'd expect someone who is taking on such a swap would be aware of phasing, but it's possible they didn't do it right.
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Old 09-30-2018, 09:16 PM   #5
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that is very true. I am going to check angle and phasing hopefully tomorrow when I get home from work. I'm thinking it may be more driveline angle than phasing, but could be a combination of both. I'll let everyone know as soon as I get some more info on it, and I will post some pictures as well. Thanks everyone
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Old 10-01-2018, 12:06 PM   #6
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For long life, the angle of the joint should be more then 0, but less then 3 degrees. But angles larger then 3 shouldn't cause a vibration. Vibrations usually occur because the U-joint is wore out, or the joint angles on the shaft don't cancel each other out, or the phase of the joints are out. The last one isn't common on one piece shafts because it's a welded assembly, however on shafts with slip joints it's easy to install the slip yoke a tooth off.

Here is a video on driveshaft angles and phasing.
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Old 10-01-2018, 08:31 PM   #7
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Thanks everyone for the info. I haven't had a chance to work on her yet. I am hoping to get a chance tomorrow. One other question for everyone. What would be a good pusher fan for the ol girl? There isn't enough room between the radiator and the water pump pulley to install a regular fan. Any ideas? Thanks, William
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Old 10-01-2018, 08:51 PM   #8
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Great info. Thanks for sharing. And yes...setting up a driveline "out of phase" is a very common problem. I've seen "pros" who had no idea it was even an issue.
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Old 10-01-2018, 11:24 PM   #9
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considering it has a slip joint on each shaft, if I remember right, it is quite possible thats what the issue is, as well as the angle of the rear shaft. It seamed really steep when I looked at it the other day
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Old 10-02-2018, 10:11 AM   #10
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Quote:
Originally Posted by thumper_65590 View Post
Thanks everyone for the info. I haven't had a chance to work on her yet. I am hoping to get a chance tomorrow. One other question for everyone. What would be a good pusher fan for the ol girl? There isn't enough room between the radiator and the water pump pulley to install a regular fan. Any ideas? Thanks, William
I'd try really hard to get a mechanical fan in there somehow. Yes, electric fans consume more hp then electric but the cfm difference is also pretty large in favor of a mechanical. That is why most of your heavy duty stuff still runs a mechanical fan(with an electric on/off clutch).

If you must use an electric fan, puller types are something like 20% more efficient then pusher types.
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