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Old 02-10-2015, 07:11 AM   #15
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Quote:
Originally Posted by dulobast25 View Post
allison 542 swap or not?
I know this is an old thread but it seemed like good advice being thrown around.

however i didnt understand several of the terms used except jake brake tranny etc.

perhaps someone can define some of the terms above like spicer etc.

So,

I have a 35' coach on a diesel pusher spartan chassis. Actual weight is 22,500 lbs.

it is powered by an dd 8.2t or 500-t with 230hp and approx 450 ft lbs of torque. max engine speed is approx 3200 rpm. This is mated to an allison 542 w/o parking pawl. I don't know the eaton axle gear ratio.

tire OD size is about 37"

engine is ultra reliable, purrs like a kitten, never had a problem.

Heres the problem:

top speed is only 68 on a straight. with virtually no additional passing power ability.

Only had it to about 83 once and only once during a cool evening, however i found out later that the alt belt was off. Lol having one less component to turn may have created an underdrive pulley effect freeing up hp or engine speed and when coupled with the cool air prob added some performance.

Even worse:

When I pull hills the rv can slow down to as slow as 20 mph which to me is ridiculous exp since a carbed 454 and 3 sp chevy tranny in a 31' p30 chassis in a coach of same mfg can do at least 30 on a similar hill.

I want to pull a 5000-6000lb vehicle and when on straights i can and do with a 5000 lb toyota 4runner atop a 1400 lb trailer. I dont even feel the load back there at all but when pulling a hill, i have to un hitch and have my wife follows up the hill an we re-hitch at the bottom. Kind irritating when i see vanhool and other diesel buses pull the hill without effort. Becasue of this i wont pull a tow vehicle right now. I also wont plan too my trips around mountain ranges.

So whats the cause? Not enough torque, power, or is the tranny losing power or torque via lack of a lockup?

I hear that the 542 has no lockup. If it the tranny, i was considering an allison 2000 tranny with standalone computer and throttle sensor etc. I was hoping to pull the tranny i needed from a chevy duramax truck or other donor vehicle.

I know i cannot raise boost due to bhg, but the 8.2 is not intercooler so i figure power can be had by adding an intercooler to cool the intake charge, adding an egt and a/f ratio gauge. Next, id like to add propane injection and possibly raise governor speed and somehow slightly increase fuel pressure. If i cant do the above id consider a repower to a 7.3 powerstroke, 6.6 duramax or cummins 5.9 or 8.3.

So which do u think is the culprit?
Dulobast, it has been very long ago, when we used the old 8-v detroits in the trucking industry. But to make them run, so to speak, was to put a intercooler on them, and make sure they could get enough fuel! It would seem that the stock pump just did not supply the engine with the fuel it needed to get it up the hill, so we would add a extra elect. fuel pump in line to the motor, with a toggle switch wired in on the dash. When it would start bogging down going up the hill, flip the switch, and presto, it would go up the hill! Now this was also done to a 8v92, 430 hp. DD in the later years, and helped it a lot! I think you need to find a old diesel mech. that knows the old Detroit's, and have him set your's up to run the way you want it to. You are going to lose fuel mi. by doing this, but if you want to get that "ol" girl to run, just a couple of options? Rail!
PS, the elect. fuel pump is cheap easy fix, if it works for you! Since you already have the intercooler! All it does is make sure the motor has all the fuel it needs! Hope this helps!
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Old 02-10-2015, 08:38 PM   #16
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Allison AT542

Anyone know what the max horse power this transmission will take? I have the same tranny and am trying to get on a dyno to check HP and torque.

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Old 02-11-2015, 01:06 AM   #17
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tranny swap or engine repower swap?

the allison 542 can only handle 235 bhp and 440 ft lbs of torque

http://powerforce.com/PDFs/Transmiss...S_PF_AT542.pdf

prob a good idea to convert it to a 545 by unstalling a higher capacity 545 tranny fluid pan.
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Old 02-11-2015, 07:33 AM   #18
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Quote:
Originally Posted by dulobast25 View Post
the allison 542 can only handle 235 bhp and 440 ft lbs of torque

http://powerforce.com/PDFs/Transmiss...S_PF_AT542.pdf

prob a good idea to convert it to a 545 by unstalling a higher capacity 545 tranny fluid pan.

And what would that raise the capacities to?

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Old 02-16-2015, 12:57 AM   #19
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tranny swap or engine repower swap?

the kit is approx $130 from allison which includes the deeper pan. The extra fluid capacity helps keep the fluid cleaner longer and helps keep the tranny cooler by the heat dissipating thru a greater quantity of fluid.

In terms of better performance the at1542 is a at542 but with a lockup torque converter that performs better in terms of transmitting engine power to the wheels.

I hear you can install a 1542 convertor in the 542 to gain the lockup feature in 4th gear.
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Old 02-16-2015, 09:27 AM   #20
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I would certainly be interested in the lock-up torque converter available in the 1542. How much do you think it would cost to have the 1542 torque converter and larger pan put in my 542?

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Old 02-16-2015, 10:17 AM   #21
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Check with an allison dealer.

Labor to pull tranny etc.

May be better to locate rebuilt better unit and upgrade all since labor is same.
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Old 02-17-2015, 10:39 AM   #22
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tranny swap or engine repower swap?

a 542 with lockup 1542 torque converter is a 1545 tranny.

I agree with that if you take this to a mechanic, you should consider a rebuilt or lo miles 1545 as the labor to R&R is the same.

If the 1545 is not an option, the mt643 is.

at542:
http://powerforce.com/PDFs/Transmiss...S_PF_AT542.pdf

mt643:
http://www.candbsales.com/Images/Int...20mt%20643.pdf

the cruising gear ratio is the same however note gearing for 1st is more aggressive and all else equal will pull hills better and gears 2 and 3 are less agressive.
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Old 02-18-2015, 09:41 PM   #23
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tranny swap or engine repower swap?

Guys,

I just got in contact with someone selling a cummins 8.3 with md3060 transmission with for $5000..

"Allison MD3060 automatic transmission; I intended to use this engine and transmission to repower an older truck, plans have changed and I am using a NV4500 manual trans. The engine and transmission came out of a 1994 pusher motorhome with 47,000 miles. I have everything for this transmission, wiring harness, shift pad, cruise control, computer and manuals..."

"
Yes, it is a Cummins 5.9 230hp, the engine and transmission came out of a motorhome with 47,000 mi."

"
The engine and transmission are complete with all accessories on the engine including radiator and intercooler, I believe you have seen what comes with the transmission. ..... $5000.00 for both.
Thanks,"

"...the motor home was damaged when a tree fell on it and the owner did not have it insured. The engine and transmission worked flawlessly before removed, since he was parting it out I cut the rear portion of the frame off and took everything at once so it still sits in the frame. I have the driveshaft also, I suppose it could be started sitting in the frame.."

the rv body has been cut away and lifted from around the engine and chassis.

What do you guys think?
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Old 02-19-2015, 07:53 AM   #24
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If you're up for that kind of a project, sounds like that deal has your name written all over it.
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Old 02-19-2015, 10:23 AM   #25
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Old 02-19-2015, 08:31 PM   #26
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tranny swap or engine repower swap?

lol!!!!!!!!!!!!!!!

You nailed it..yeah she is! Well, as long as i sell my pickup, i think im ok...

but yeah lol
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Old 02-19-2015, 08:41 PM   #27
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But what would you sleep in then?
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Old 02-19-2015, 11:06 PM   #28
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tranny swap or engine repower swap?

lol, id sleep in my other pickup!

Actually, I just confirmed it was a 5.9 12 valve, damn!

not sure why you would need an md3060 behind a 230hp stock 5.9

He wants 2k for the tranny computer and harness.

Tranny looks real clean.

Allison MD3060 Automatic Transmission

too much?
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