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Old 11-11-2010, 10:27 PM   #1
Skoolie
 
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so slow s1800 9 liter

does any one have this experience with their 9 liter. its an b5 thomas body 32 footer witha nine liter ihc and an AT545. i used to have a 5.57 rear end and it was dead slow so i put in a 4.44 and it still cant do over 50 on flat ground 2800 rpm ( max safe rpm ive been told by many bus mechanics). its an absolute old dog on ANY hill. only has 185K on the engine and has been well cared for. whos got a nine liter and what do yall think. it took me a week to drive 2000 miles at an average highway speed of 45 mph. at 7.5 mpg.....??????????????????
thanks
adam
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Old 11-11-2010, 10:32 PM   #2
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Re: so slow s1800 9 liter

I have a lot of experience with them....5 spds though. I dont know what the axle ratios were but I do know I had to bend the needle in the tachograph to keep the boss lady off my heels. 65 wasnt an issue. Great engine in my experience.
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Old 11-12-2010, 11:09 AM   #3
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Re: so slow s1800 9 liter

well its an 85 with 185k on it. 9.o na with an AT545. 32 footer so i assume that the 3/4 size. when i bought it it would only go 45 max..took off governor no change..
.so i figured if i switched the rear end ratio id be able to get a higher top speed on the flats knowing that itd be slow on hills but mostly i cruise cross country on interstates. the original rear ratio was 5.57 and it had split wheels. well my junkyard buddy hooked me up with a deal......a complete axle assembly.with only 20k miles on it...leaf springs air pots new budd wheels brand new rubber on all four wheeels all for 1500.
so i felt it was an awesome upgrade. safer more modern super low mileage etc all for 500 dollars more than the replacement rear gear for my original pumpkin would cost.
oil change all new filters replaced gaskets to stop oil leaks. the other difference besides axle ratio is the outer diameter of the tire is more modern standard..24 i believe i need to go check.
also i baby it. i go low rpm on hills and dont push it. i keep it below 27-2800 and since have owned it not gone over that religously...
so i dont know whats up. my uncle is a big rig mechanic albeit a grumpy one who cant be talked into working on it even for mony but he did go for a fifteen minute test drive (not on the highway but rural without any big hills) and says it sounds good and seemed to be running good

still has 22.5 tire in front and 24s in rear so it looks like a gasser hot rod

also just did a mileage check and for a trip thru vermont with moderate terrain we go 7.5 MPG

i feel i have a serious issue with this thing im constantly getting honked at and flipped off for being so slow
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Old 11-12-2010, 11:46 AM   #4
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Re: so slow s1800 9 liter

We drove them hard, kept them wound up well. I dont think you are going to get what you want by babying it. I know where you are coming from but that is just my experience.
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Old 11-12-2010, 01:38 PM   #5
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Re: so slow s1800 9 liter

so should i go over 2800rpm.is that safe.
also often its floored and still wont even go over 2800.
often when its gets close to going over 2800 the tach needle starts to bounce.... whats that all about
thanks
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Old 11-12-2010, 06:58 PM   #6
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Re: so slow s1800 9 liter

It should be governed around that I do believe. That's all you are going to get. Don't expect to get into a hill with low rpms and expectbit to pull the hill. Make sure it's wound tight at the bottom and what you get is all you are going to get.
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Old 11-12-2010, 08:48 PM   #7
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Re: so slow s1800 9 liter

Unless you changed out what you would have to get the speedo to read right with the rear end you put in there it may still read that lower speed that it did before.

Get a gps unit and go out and see what it does.
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Old 11-17-2010, 02:45 AM   #8
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Re: so slow s1800 9 liter

Sounds like a great deal on the axle!
Diesels can run pretty ramped up just fine
You just have to make sure to monitor your exhaust temps
check out "neverenufhp" on this board
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Old 11-24-2010, 03:38 PM   #9
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Re: so slow s1800 9 liter

I checked Gear Vendors for an aux trans unit...that was 9 months ago. They don't have them (or didn't) for Allison AT & MT series transmissions. Wish they did!
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Old 11-24-2010, 07:22 PM   #10
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Re: so slow s1800 9 liter

NC, unless I missed something in the article you referenced, they said that a TH475 with a GearVendors was similar to the current 5 speed Allison backing the 8.1L GM motor. I checked the Gear Vendor site and they mention the usual transmissions (TH350, and some of the electronic 4 speeds). I didn't see anything, unless I missed it, for the bigger AT & MT Allison trans.

I have an AT 545 behind my 8.2L Detroit. If I somehow missed something, let me know.
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