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Old 10-23-2012, 08:43 AM   #57
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Originally Posted by LimeyRich View Post
It came out of a 1996 HD (3500?) 14,000/16,500 gvw series commercial box truck without the electric/hydraulic brake,that they put in the 90's motorhomes. However, the brake shoe is much wider than the original airstream shoe, swept area looks about the same. The big drawback from my point of view, it's a spring operated "normally on" system. So a quick learning curve in not driving off with the parking brake on.
The nice part is the trans' does have a parking pawl, so I don't have to spend the money on adding one.
New trans support should be here tomorrow P.M.
So that's what the electric parking brake looks like. First time I've seen one.

My 4L80E came out of about a 1992 Chevy box truck. Based on your statement above it sounds like mine may not have a parking pawl installed. Just how expensive is it to have one of those installed in the transmission?

Quote:
How did you make out with finding a rag joint?
I'm waiting until I get home to get measurements before trying to order one. I figured since I'm buying one for the Argosy I might as well buy one for the 310 since the steering in it is a little sloppy. I've replace all the joints, etc just never replaced the rag joint.

Brad
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Old 10-23-2012, 09:34 AM   #58
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1988 34.5' Airstream 345
The eastern swamps , North Carolina
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Well Brad I still don't think we have seen an electric/hydraulic E brake! They have a whole lot of "unnecessary plumbing" and cabling in order to make the parking brake "secure" and "safe" for us feeble RVers!.
I strongly advise going to:
www.irv2.com/forums/f22/auto-park-brake-workhorse-p-32-a-138863.htm

A good place to start learning why we do not want to accidentally upgrade our vintage machines to this awful conglomeration of machinery.

It is possible that your 4L80 has a traditional pull-on parking brake as it appears that some earlier models did not yet have the "Auto-Park" system. Unfortunately I do not have proof of this, only what I have tried to glean from other posters on forums.
It also appears that the drivers of midsize commercial trucks were deemed to be trusted to be able to put on a handbrake.


The parking pawl is good news though. Your 4l80 probably has it, if not. All the small parts for adding "Park" are readily available new or used, and most 4l80's come with them. They are easily installed by any transmission shop or mechanic who dabbles in transmissions.
See the second pic in Jakes 4L80 build sequence on the "Nasty Z28" forum. The rod that runs from the shift lever to the back of the transmission activates the small spring loaded "pawl" parts located in the back of the case, here:
> 4L80E Build - NastyZ28.com <
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Old 10-23-2012, 06:11 PM   #59
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1988 34.5' Airstream 345
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Sorry that link to> iRV2 - The Friendly RV Forum Community < is not working properly. So go over to "irv2", "forums", then "The chassis club forums", "Workhorse" and peruse the "Auto Park threads"
All the best.
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Old 10-23-2012, 06:33 PM   #60
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Awesome info!

I have a TH400 rebuild in my near future..
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Old 10-23-2012, 08:10 PM   #61
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1974 20' Argosy 20
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Originally Posted by LimeyRich View Post
Well Brad I still don't think we have seen an electric/hydraulic E brake! They have a whole lot of "unnecessary plumbing" and cabling in order to make the parking brake "secure" and "safe" for us feeble RVers!.
I wonder if GM developed the smaller brake drum for vehicles where having a 14" (or there abouts) diameter brake drum under the floor would take up to much space.

Quote:
It is possible that your 4L80 has a traditional pull-on parking brake as it appears that some earlier models did not yet have the "Auto-Park" system. Unfortunately I do not have proof of this, only what I have tried to glean from other posters on forums.
It also appears that the drivers of midsize commercial trucks were deemed to be trusted to be able to put on a handbrake.
I'm going to have to pull my 4L80E out of the corner after I get home to see just what it might have. I really need to find any identifying numbers on it so I know just what I have.

Quote:
The parking pawl is good news though. Your 4l80 probably has it, if not. All the small parts for adding "Park" are readily available new or used, and most 4l80's come with them. They are easily installed by any transmission shop or mechanic who dabbles in transmissions.
See the second pic in Jakes 4L80 build sequence on the "Nasty Z28" forum. The rod that runs from the shift lever to the back of the transmission activates the small spring loaded "pawl" parts located in the back of the case, here:
> 4L80E Build - NastyZ28.com <
I'll take a peak.

Thanks!

Brad
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Old 10-24-2012, 01:49 PM   #62
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.......new trans support is here, sadly it is identical in shape and dimensions to original 1988 support. OK , done for now, just do not feel like fighting it today.
All the best.
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Old 10-24-2012, 02:20 PM   #63
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.......new trans support is here, sadly it is identical in shape and dimensions to original 1988 support. OK , done for now, just do not feel like fighting it today.
All the best.
Bummer. Now you're making me wish I had been able to keep the cross member from the box truck where I got my transmission. Hang in there Rich.

I think over the Thanksgiving holidays I better head out in search of some salvage yards to see if I can find something that is appropriate.

Brad
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Old 10-25-2012, 09:23 AM   #64
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You may want to look at my trails blood and tears when I did the 4L80e. Allison questions / how many cans of worms can a 28' motorhome hold and 4L80e what have I done!
I started out with a 'heavy duty' tail shaft housing but could not find an e-brake to fix. When I went to one junk yard the guy said, "If you find one, I need one too." The HD housing was only used on the tilt bed wreckers. So, I found a 'medium duty' housing and the first junk yard I visited had a '70?? motor home with a 400 trany. I got the e-brake and cross member. Had to drill new hole in the frame (not fun) for the cross member and mover the tail shaft mount ( more drilling) to clear the e-brake drum, but all worked in the end.
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Old 10-25-2012, 09:49 AM   #65
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[ Hang in there Rich.]
[You may want to look at my trails blood and tears when I did the 4L80e]

Brad and Mel, Thanks for posting! I have looked and looked through the threads for the Airstream 4L80 info, And have not found it.
I know it was there because I read through it all in 2009/10. Can you point the way back to those threads?
yeah, it really is a big job to tackle, but I can see it going together now.
Because of my previous health problems, I know to push the "envelope" but not exceed my physical capabilities. I just spent too much time under the 345 this week and both frustrated,and exhausted myself to the point that a small snag was temporarily overwhelming.
Plus I have faithfully subscribed to the following uplifting philosophy: " When in danger,when in doubt. Run in circles, scream and shout!"
All the best. Thanks. Rich.
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Old 10-25-2012, 11:06 AM   #66
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Is this the one Choc was refering to?
http://www.airforums.com/forums/f159...old-69221.html
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Old 10-25-2012, 11:20 AM   #67
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Rich...
If you had not seen this already, some great info here...

Automatic Overdrive Transmission Swap
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Old 10-25-2012, 12:49 PM   #68
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1974 20' Argosy 20
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Quote:
Originally Posted by choctawmel View Post
You may want to look at my trails blood and tears when I did the 4L80e. Allison questions / how many cans of worms can a 28' motorhome hold and 4L80e what have I done!
I started out with a 'heavy duty' tail shaft housing but could not find an e-brake to fix. When I went to one junk yard the guy said, "If you find one, I need one too." The HD housing was only used on the tilt bed wreckers. So, I found a 'medium duty' housing and the first junk yard I visited had a '70?? motor home with a 400 trany. I got the e-brake and cross member. Had to drill new hole in the frame (not fun) for the cross member and mover the tail shaft mount ( more drilling) to clear the e-brake drum, but all worked in the end.
I just finished reading your thread on installing the 4L80E in your 345. Quite and ordeal! Now that it is a couple of years down the road are you happy with the conversion?

I was going to ask you what you did for a replacement cross member then I realized that you had removed an Allison transmission so the cross member would have been different. Rich and myself are switching from TH400/475 transmissions to the 4L80E and Rich is having trouble sourcing the correct cross member.

The 4L80E that I will be using came from a 92 Chevy box truck so it has the parking brake on the back. Only problem is my 74 Argosy motorhome has the parking brakes in the rear brake drums

So I have to decide if I want to use the original brakes on the differential which would mean replacing the tail shaft housing on the transmission or use the the drum brake on the transmission which means figuring out the cabling issue and abandoning the original parking brakes at the differential.

I probably won't worry about this to much until I get farther down the road.

Brad
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Old 10-25-2012, 01:30 PM   #69
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Brad if you choose to stay with the rear axle parking brake I don't see a need to change the tailshaft housing. Just remove the backing plate and the drum and bolt the flange up to the drive shaft.

On another point if I had a choice I would keep the axle brake. I have leveling jacks and if you get one side up too far and loose traction on one rear wheel, with a drive line brake you loose your parking brake. With the axle brake you still have one wheel holding. Large modern parks are not a problem but in some of the more interesting parks the pads are not so level and in the rain and mud it can get interesting.

Good luck, Dan
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Old 10-25-2012, 01:30 PM   #70
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Brad , you have rear drum brakes with factory rear emergency brakes!!
Keep that system alive, in good repair,and adjusted. That system is dead simple, anyone can work on it.
What Smartstream says too.
The reason for the transmission mounted brake in the first place, is 4 wheel disc brakes that cannot be cable actuated.
There is no reason for you to mess with transmission mounted emergency brakes.
I would just pull the small parts,(springs,shoes and cable) from the trans brake,leave the drum in place, hook up your driveshaft and roll with it.
Or if you really want to have two emergency brakes, and experience the exquisite frustration of figuring this.... out, I appreciate the solidarity of that, but really there is no need.
All the best. Rich
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