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Auto conversion

Discussions regarding bus to motorhome conversions are welcome here.

Auto conversion

Postby Ozfisho » Mon Dec 30, 2013 2:15 pm

Hello all, newby here and looking to get a question sorted. I'm thinking of purchasing a Silver Eagle 05 that has already been turned into a motorhome. It has the 8V71 motor tied to a 4 speed crunch box. I can access a Allison HT740 auto for it but was wondering is this is straight forward conversion or can it get bigger than Ben Hurr.

Regards
Dale
Busselton
Last edited by Ozfisho on Mon Dec 30, 2013 9:03 pm, edited 1 time in total.
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Re: Auto conversion

Postby B7RLE » Mon Dec 30, 2013 2:57 pm

I'm not to sure about these two in particular but they can get quiet big in general terms
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Re: Auto conversion

Postby boronia » Mon Dec 30, 2013 2:59 pm

Which way is the engine mounted?
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Re: Auto conversion

Postby Ozfisho » Tue Dec 31, 2013 10:12 am

Well to be quite honest, I haven't got a clue.
Cheers
Dale
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Re: Auto conversion

Postby kelvin12 » Tue Dec 31, 2013 4:06 pm

I am not familiar with Eagles and how the motor is situated, but not a hard conversion generally but you need to check a few things first. Check the diff ratio if its suitable for a transplant, can't blame you getting rid of the old crash box. I changed to a HT750 DR replacing the 6 speed spicer when I changed the my motor, (6V92). My bus is an Austral with the motor front to rear set up. You will need a substantial transmission cooler for starters, plus all the associated piping, big and expensive unless you can pick up with the transmission. Coolers are reasonably expensive and do take up some room especially if the transmission is a retarder type, then its a huge cooler and really expensive as retarders generate a lot of heat and the heat needs to be cooled for the transmission oil, Jake brakes are a better option. Assuming you bus is a a normal front to rear motor, (north south as opposed to a cross mounted motor) then the tail shaft will need to be shortened. Plus a manual 'T' bar shifter rather than one of the electronic shifters. To check the end road speed here is a site, you need to put in tyre size and final transmission ratio and tyre size PLUS the diff ratio you now have fitted to give you some guide of the final road speed the vehicle would be capable of. http://www.roadranger.com/ecm/groups/pu ... 062746.swf You could always change the diff ratio of course if you still want to go this direction. You might find depending on the diff fitted now that's its a bit slow. Mine luckily was quite high and should give me a good top end road speed.

Before you go much further you need to find out how the motor is sitting in the chassis. Most American busses were fitted east west, (across the chassis, sideways). Still its not the end of the deal but a lot more complicated.

Welcome to the bus conversion nightmare....

Happy to talk about this if you like.

Dirk
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Re: Auto conversion

Postby Ozfisho » Wed Jan 01, 2014 9:50 am

Thanks for that Dirk, the reason I thought it could be a good thing was that some of these Silver Eagles have the auto as standard. The tranny I was looking at comes with oil cooler and fans and a Morse shifter. I'd have to look further into what piping was included as the tranny comes out of a fire tender and only has 20k kilometers, so it looks like it may be a good thing, but obviously it will need to be an easy change out. I haven't got the motorhome yet, that could happen in the next month or so.
Cheers & Happy 2014.
Dale
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Re: Auto conversion

Postby Doc68 » Wed Jan 01, 2014 4:08 pm

kelvin12 wrote:can't blame you getting rid of the old crash box. I changed to a HT750 DR replacing the 6 speed spicer when I changed the my motor, (6V92).Dirk



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Re: Auto conversion

Postby boronia » Wed Jan 01, 2014 4:55 pm

Ozfisho wrote:Thanks for that Dirk, the reason I thought it could be a good thing was that some of these Silver Eagles have the auto as standard. The tranny I was looking at comes with oil cooler and fans and a Morse shifter. I'd have to look further into what piping was included as the tranny comes out of a fire tender and only has 20k kilometers, so it looks like it may be a good thing, but obviously it will need to be an easy change out. I haven't got the motorhome yet, that could happen in the next month or so.
Cheers & Happy 2014.
Dale

If it has an "east-west" engine, you probably won't be able to just put a standard tranny on the end.

The manual box in the GM PD4106-7 had a right angle drive down to the diff. There was an auto available for them in the US, but I'm not sure how it was configured. Murrays converted a couple using 2nd hand units bought in for the job.
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Re: Auto conversion

Postby ax8 » Wed Jan 01, 2014 7:58 pm

There was an eagle for sale that had a 8v71 and a 740 auto in it, so it can be done.
http://www.tradingpost.com.au/Automotive/Trucks-and-Buses/Trucks-and-Buses-For-Sale-/Silver-Eagle-05-Model/Camden/NSW/AdNumber=TP005381588

You could always call them and ask if they had the conversion done.
Looking around on the net, seems to be a few Eagles with a 8v71 and a HT740.
You would think it would be a straight forward swap, considering how many have that combination.
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Re: Auto conversion

Postby kelvin12 » Thu Jan 02, 2014 6:52 am

G'Day Dale,

Very popular box in the US so plenty of information available on their forums. Wouldn't bother with the Eagle forum though seems to be in self destruct mode and run by idiots. As Boronia said the east west engine set up was an angle drive to the diff so not sure if its a different transmission housing or not, something you will need to look into. To set you on the right track you could make some inquiries here, http://www.dal-trans.com.au/ They went out of their way to help me with my conversion. Speak to Mark in spare parts, tell him he was highly recommended, probably won't remember me personally though.

You have all the right gear to go with the box so that's a huge plus.

Dirk
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