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Old 09-27-2010, 04:48 PM   #15
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1986 34.5' Airstream 345
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Mel, I didn't catch do you have an Isuzu in your coach now? If so is it hurt or are you planing for the future?

The Isuzu is a pretty tough engine and does reasonably well in the AS. The Cummins is a great engine but the changeover can get to be costly. If you stay with the Allison you might consider an early mechanical Cummins. The newer electronic engines want to talk to the trans and electronically connecting your trans to the Cummins computer can be a challenge. A transplant engine/trans package may be a better solution.

On the other hand doing an in-frame overhaul on your Isuzu will probably enable it to live longer than your coach and save you lots of bucks.

Just a few things to think about, Dan
Oh! sorry! No I have a gas 454. My dream was to find a '05 or younger N-series Isuzu wreck and replace the Gas with Diesel, but it ain't gone-a happen.
Did some checking again today. Found a good shop who will build a 6L80e. The headache is, I need a wiring harness to go with my '90 (added on) GM EFI, cross member, change the drive shaft, york, a shifter. Have heard of places that can remap the computer to work, will see.
Wish my '01 Dodge Diesel was automatic. The truck would be scrap metal by now. That baby will haul butt!
I got some calls and emails in to some people.
mel
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Old 09-28-2010, 02:32 AM   #16
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Oh! sorry! No I have a gas 454. My dream was to find a '05 or younger N-series Isuzu wreck and replace the Gas with Diesel, but it ain't gone-a happen.
Did some checking again today. Found a good shop who will build a 6L80e. The headache is, I need a wiring harness to go with my '90 (added on) GM EFI, cross member, change the drive shaft, york, a shifter. Have heard of places that can remap the computer to work, will see.
Wish my '01 Dodge Diesel was automatic. The truck would be scrap metal by now. That baby will haul butt!
I got some calls and emails in to some people.
mel
Why don't you forget the 6L80e and just find a Dodge automatic for your '01 and stuff the package in your moho? You are going through most of the hard stuff to add the 6L80e, just do the same effort and add the Cummins in front. Fabricate front motor mounts and you are there.

Go for it, Dan
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Old 09-29-2010, 02:34 PM   #17
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Why don't you forget the 6L80e and just find a Dodge automatic for your '01 and stuff the package in your moho? You are going through most of the hard stuff to add the 6L80e, just do the same effort and add the Cummins in front. Fabricate front motor mounts and you are there.

Go for it, Dan
Need a 6L that's rebuildable The one's I've found are built and cost around $4000 and then the harness/control system is another $1300.
Keeping an eye on craigslist.
Keeping an open (or is that absent) mind.
Been looking for a Dodge wreck with a cummins/auto for a while. The few I've come across were either manuals, or crushed too bad.
I'm on drugs right now, so, I'm not going to start it yet.
mel
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Old 10-04-2010, 05:09 PM   #18
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[IMG]file:///C:/Users/Mel/AppData/Local/Temp/moz-screenshot.jpg[/IMG]
I have started building some ramps. I still haven't decides which way to go, rebuild the Allison 454 ($1650) and still get 6mpg. Or go to a 4L80e (no controller available for a 6L). I can get the transmission ($2200); controller ($1300); driveline reworked ($150); build or find a cross member ($???); get the park brake to work ($???); Unknown other ($???). I'd get a mile or 2 more per gallon, the road RPM would be lowered, and I can build more power into the motor later.
Maybe I need to drink some more beer the think about this.
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Old 10-04-2010, 05:20 PM   #19
Full Timers/Diesel power.
 
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After spending a ton of cash and getting not too improved mileage, I'd keep the 454. The heat was the big problem with those engines, but for a fraction of the cost of what you're considering, that can be taken care of. Have another beer; it's not worth it.
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Old 10-04-2010, 07:49 PM   #20
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[IMG]file:///C:/Users/Mel/AppData/Local/Temp/moz-screenshot.jpg[/IMG]
I have started building some ramps. I still haven't decides which way to go, rebuild the Allison 454 ($1650) and still get 6mpg. Or go to a 4L80e (no controller available for a 6L). I can get the transmission ($2200); controller ($1300); driveline reworked ($150); build or find a cross member ($???); get the park brake to work ($???); Unknown other ($???). I'd get a mile or 2 more per gallon, the road RPM would be lowered, and I can build more power into the motor later.
Maybe I need to drink some more beer the think about this.
I would be very wary of using your ramp. There is nothing to keep the whole set-up from going forward or backward and the whole thing collapsing flat on the ground. Also the top plank wants to be doubled and probably twice as many vertical supports. If you really want to use wood solid is best. Buy several boards and stack them flat on top of each other to reach the height you want.

I would also hesitate a trans change. You are looking at $4000 and at a 10% gain in mpg you need to spend $40000 on fuel to break even. Fix the Allison if it needs it and enjoy your coach. If you want to drop the rpm some change the gear ratio in the differential. It can probably use some fresh bearings and while you have it apart a new ring and pinion is only a few bucks more and now you only need to worry about the engine drive-train wise.

Good luck, Dan
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Old 10-05-2010, 08:38 PM   #21
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OK, got the two ramp build for the tag and the outer dual. Now I need to built two shorter ramps for the inter duel. Yes, I think my ramps will handle the weight just fine. By the time I get the other ramps build, this thing would support an M-1 tank! If not, the Silver Bullet will fall over and take out my shop as well.
Still think I'm spent the money and go with a 4L80. If it would give me the MPG that some claim they get (10-12mpg) the pay back would be from 23,000 miles to as few as 6000 miles. Only if I can find the a 4L80e transmission that is.
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Old 10-05-2010, 10:13 PM   #22
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OK, got the two ramp build for the tag and the outer dual. Now I need to built two shorter ramps for the inter duel. Yes, I think my ramps will handle the weight just fine. By the time I get the other ramps build, this thing would support an M-1 tank! If not, the Silver Bullet will fall over and take out my shop as well.
Still think I'm spent the money and go with a 4L80. If it would give me the MPG that some claim they get (10-12mpg) the pay back would be from 23,000 miles to as few as 6000 miles. Only if I can find the a 4L80e transmission that is.
Attachment 112527
That ramp looks a lot better. The ramp in the other picture not so much.

You may want to recheck your numbers. 6000 miles @ 10 mpg takes 600 gallons @ $3.00/gal is $1800. That is less than half of the cost of your mod and somehow I don't think you will see a 10 mpg improvement.

Install whatever makes you happy just make sure all your research is accurate.

Good luck, Dan
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Old 10-05-2010, 11:31 PM   #23
Full Timers/Diesel power.
 
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I'm looking forward to whatever road to recovery you take: keep the pics coming. Upload them, if you can, in a large enough format so we can click on them to enlarge.
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Old 10-06-2010, 03:20 PM   #24
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That ramp looks a lot better. The ramp in the other picture not so much.

You may want to recheck your numbers. 6000 miles @ 10 mpg takes 600 gallons @ $3.00/gal is $1800. That is less than half of the cost of your mod and somehow I don't think you will see a 10 mpg improvement.

Install whatever makes you happy just make sure all your research is accurate.

Good luck, Dan
Dan, got to remember the first ramp pic was the frame as I was 'building' the ramps.
I was just doing the numbers in my head. My head don't work any better than the rest of me anymore I guess.
I fix the 545 I have: $1650 6mpg $0 saved in gas.
Upgrade to 4L80, added cost: $2850 8mpg $.125 per mile 22800 miles recovery;
10mpg $.20 per mile 14250 miles recovery;
(Some claim this and more w/454) 12mpg $.25 per mile 11400 miles recovery.
And gas prices will go up, so the pay back will come down.
If I keep the 545 I can't make the 454 more powerful because the input torque on the Allison isn't very high. I may have already exceeded that limit when I changed to TBI.
I'm going to have to make a decision soon. By next week I'll be looking that it (the Allison) on the floor.
mel
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Old 10-07-2010, 02:06 AM   #25
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Dean took his chainsaw to a RR tie , cut just right , makes dandy ramps, screw on some handles and some stop blocks , another trick for pulling, rather dropping trans , is to use a single line comealong , take cableover top of frame , under trans at bellhousing then back over top of frame and hook to bottom of frame , use a shackle & chain to hold cable opposite other side, then secure comealong to front suspension, perpindecular to frame, with room to work it, I have used this trick on a 98 s10blazer and the 81 excella, damn slick for dropping and installing trans , guy can use some cinch straps to raise and lower other end, using 2 straps lets you lower at controlled rate, I shouldnt let this out, but Dean has pulled his allison in less than 1.5 hrs single handledly , of course this was the third time charm on day 9 of my allison rebuild clinic , my machinist buddy helped bolt it in on last round as third charm was his misfortune of creating , still gotta pull valve body to reprogram shifting
Dean
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Old 10-09-2010, 07:38 PM   #26
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After hitting the ramp with the hitch, and 5 or 6 tries I got Silver on the ramps. They worked! Got the drive shift, park/emergence brake off, Had to grind out the hole to get the toque converter bolts out. They must of used the hole next to the oil filter without the cooler plate on. Now I'm down to getting the bolts out of the mounts. May get the cutting torch out to get this done. Want to have the 545 on the floor Sunday! I'm hopping the headers don't have to come off!
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Old 10-10-2010, 06:19 PM   #27
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Dropped part of the transmission mount on my upper lip! Cut a hole in my arm! But I'm a winner! That 545 Allison in out of there! Now the question is, up grade of not.
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Old 10-11-2010, 07:28 PM   #28
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It's been a hard and bloody trek. But I've found a 4L80e. I'm going to UP-grade! The starter, fly-wheel, drive shaft will be deterrent. The emergency brake bolts to the tail shaft of the 545 and that will be a ???? the speed-o-meter is cable now and electric on the 4Ll80e. Many bridges to cross .
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