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Old 07-19-2013, 01:14 PM   #1
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AT545 and Mountain driving

is it just me or maybe tranny needs service.

coming down a big hill, the tranny did a less than stellar job engine braking. now i read that it doesn't lockup...?.? last thing i want to do is replace it.... i was sure glad to be back on flat ground.

any driving/care tips appreciated
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Old 07-19-2013, 01:48 PM   #2
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Re: AT545 and Mountain driving

viewtopic.php?f=44&t=20024

read that

the tranny needs 2200/2400 rpm input for full band pressure

for me this is 2nd gear 2200 rpm at 30 mph for uphill 8% grades

I cruise in the kinda flats/rolling hills in 3rd gear at 45/50 mph watch tranny gage on mine its at convertor out so it will run at 200/210 normal driving in rolling hills

4th gear is worthless unless I am on flat ground in VA or NC

I drive it a gear low 1st gear in town

do not baby peddle, roll into throttle until you get to 2200 rpm as the tranny shifts into 2nd it chirps..dunno that's what they do


slow down and enjoy the views that's what we do now


down hill is kinda weird...slow,slow...read my above thread any questions ask I will try to help
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Old 07-19-2013, 01:48 PM   #3
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Re: AT545 and Mountain driving

where you at?
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Old 07-19-2013, 02:59 PM   #4
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Re: AT545 and Mountain driving

colorado

thanks for the post......good tips to try

going down the hill was scary, long grades and holding back with the air brakes. everything worked fine... but it just put my nerves on end.

i;ll pay more attention to the rpms and gears now. and "driving" instead of coasting...... maybe was a lot of my problem.
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Old 07-19-2013, 09:21 PM   #5
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Re: AT545 and Mountain driving

I think its one thing people over look is a tranny cooler even in daily drivers. You may want to put one on there in no way can it hurt. I was going to use a bobcat hydraulic cooler for my demolition derby car but I need to find a way to put it in the bus. This thing is HUGE....way bigger when than any store bought unit so I don't think cooling will be an issue. I know more tranny issues come from lack of cooling. Just food for thought.
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Old 07-21-2013, 03:18 PM   #6
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Re: AT545 and Mountain driving

Bapos is correct,I need to do a tranny cooler hopefully this fall
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Old 07-21-2013, 09:42 PM   #7
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Engine or trans cooler, choice is important

All coolers are not equal units. The old tube and fin is not good anymore. The modern design of stacked plates is very superior. There are lots of good used units available. Some unites have AN fittings attached. Frank
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Old 08-02-2013, 11:06 AM   #8
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Re: AT545 and Mountain driving

does your bus not have an electric retarder? i thought all colorado buses had them? at least all the ones I have encountered as conversions that originated here.
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Old 08-04-2013, 09:33 AM   #9
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Re: AT545 and Mountain driving

no retarder that i know of. i wish it did. what does it look like? maybe it does and i dont know it.

the bus came out of the mountains of arizona.... im a little surprised it does so poorly, but, im a bus now and need to slow down.
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Old 08-04-2013, 09:43 AM   #10
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Re: AT545 and Mountain driving

I agree with most of what is said here but I also think a added cooler is better than no cooler. I know most stock coolers (usually automatic units use a internal cooler inside the radiator tank) is WAY undersized. I know here in Texas Satan puts us in a death grip during the warm months and most stock units cant keep up. My advice is to get the biggest cooler your walled can afford.

If I do not use my bobcat cooler for demolition derby I will mount it under the bus and attach a fan blowing on it or sucking depending on how its mounted.

Again something is better than nothing and in this case bigger is better but as stated here the old fin and tube design is dated and there are better choices out there but I would get as big of one as you can afford.
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