Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-15-2016, 09:24 AM   #1
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Neutral Stop Safety Switch

Since I'm making the swap from a TH400 to the 4L80e I've been sorting through the wiring issues. In 1974 on the motorhome chassis GM used a Neutral Stop Safety Switch (NSSS) that fastened towards the left side rear of the transmission and was activated by the linkage movement. That transmission was long gone before I got the Argosy so other than sketches in manuals I've not seen a picture of one.

The 4L80e that I got from the 94 box truck never had any sort of NSSS mounted on the transmission and I can see no means of mounting one, i.e. none of the mounting bosses have tapped holes for mounting a switch so I am surmising that in 1994 GM put the NSSS in the steering column.

The 84 & 86 motorhomes that I'm familiar with did not have any NSSS mounted in the steering column yet I don't remember seeing any NSSS on the side of the transmission. That doesn't mean they didn't have one, I just never noticed it.

Any suggestions on what would be the best way for me to incorporate a NSSS on my Argosy using a 4L80e transmission?

Would a later steering column NSSS bolt on to my steering column and work?

Thanks!

Brad
__________________

__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is online now   Reply With Quote
Old 03-15-2016, 02:27 PM   #2
Keen amature
 
martin300662's Avatar

 
1975 20' Argosy 20
Chestfield , Kent
Join Date: Mar 2014
Posts: 2,107
Quote:
Originally Posted by bkahler View Post
Since I'm making the swap from a TH400 to the 4L80e I've been sorting through the wiring issues. In 1974 on the motorhome chassis GM used a Neutral Stop Safety Switch (NSSS) that fastened towards the left side rear of the transmission and was activated by the linkage movement. That transmission was long gone before I got the Argosy so other than sketches in manuals I've not seen a picture of one.

The 4L80e that I got from the 94 box truck never had any sort of NSSS mounted on the transmission and I can see no means of mounting one, i.e. none of the mounting bosses have tapped holes for mounting a switch so I am surmising that in 1994 GM put the NSSS in the steering column.

The 84 & 86 motorhomes that I'm familiar with did not have any NSSS mounted in the steering column yet I don't remember seeing any NSSS on the side of the transmission. That doesn't mean they didn't have one, I just never noticed it.

Any suggestions on what would be the best way for me to incorporate a NSSS on my Argosy using a 4L80e transmission?

Would a later steering column NSSS bolt on to my steering column and work?

Thanks!

Brad
I guess it prompts a follow-on question from me, of what are you going to use the select gears on the 4L80E? I see there are TH400 linkage to 4LxxE adapters - maybe they have the switch mounted on them?
__________________

__________________
martin300662 is online now   Reply With Quote
Old 03-15-2016, 02:46 PM   #3
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Quote:
Originally Posted by martin300662 View Post
I guess it prompts a follow-on question from me, of what are you going to use the select gears on the 4L80E? I see there are TH400 linkage to 4LxxE adapters - maybe they have the switch mounted on them?
On the 91-94 4L80e transmissions the shift range selector is basically the same as the TH400. The later transmissions were cable shifted which is what you're probably referring to. From what I've been able to find so far all I really need to do is lengthen the shifter rod that comes from the steering column about 3" and tweak the angle slightly. That's the easy part

The original TH400 in my Argosy (and probably yours) had a switch on the left side rear of the transmission that was used as the Neutral Safety Stop Switch. From what I have found it was specific to the motorhomes or P30 chassis vehicles. Mine is long gone and likely wouldn't bolt to a 4L80e anyway.

The 95 and up 4L80e transmissions had what is called an MLP switch located on the side of the transmission and worked in conjunction with the shift range selector shaft. The bosses for mounting that switch are not drilled on my transmission and the shaft sticking out of the transmission is not long enough to allow the switch to be used. At least I don't think it's long enough and I plan to verify that.

I did find one forum where someone had the same issue and they modified their steering column by adding a hole in the steering column for the Neutral Safety Switch and then welded a tab on the shaft inside to trigger it. That's what I'm going to be looking into this weekend. If I can go that route then problem is solved. If not I'll have to keep looking!


Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is online now   Reply With Quote
Old 03-15-2016, 06:09 PM   #4
Keen amature
 
martin300662's Avatar

 
1975 20' Argosy 20
Chestfield , Kent
Join Date: Mar 2014
Posts: 2,107
I thought you had to install a shift kit like this one Brad (http://www.shiftworks.com/4lx.htm) to get over the fact that we only have drive, 2, 1 selection.

The kit in the link comes with the option of a NSS

__________________
martin300662 is online now   Reply With Quote
Old 03-15-2016, 07:09 PM   #5
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
That might be one approach if nothing else was available. Tonight I looked closer at the 1986 steering column that I had transplanted into the Argosy and found this
Click image for larger version

Name:	74-argosy-with-86-steering-column-nss.jpg
Views:	123
Size:	202.1 KB
ID:	258819


It's been several years since I installed the column and didn't realize at the time what the switch was. At the time that wasn't something I was to concerned about. Apparently at some point GM stopped putting the NSS on the transmission and moved it to the column. I know my 74 steering column does not have the NSS installed and I'm betting your 75 doesn't and I wouldn't be surprised if Matt's 76 didn't have the NSS on the column either.

It appears that on the 4L80e transmissions starting in 1995 GM moved the NSS back to the transmission and called it a MLPS.

You might want to check your donor and see if the steering column has the switch mounted on it. If it does at some point before it goes away for good you might try and salvage the column.

The bad news is I spent over a day worrying about the problem. The good news is I didn't have to do anything to fix the problem
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is online now   Reply With Quote
Old 03-16-2016, 08:51 AM   #6
Keen amature
 
martin300662's Avatar

 
1975 20' Argosy 20
Chestfield , Kent
Join Date: Mar 2014
Posts: 2,107
I will definitely check the column on the donor Brad
__________________
martin300662 is online now   Reply With Quote
Old 03-16-2016, 07:54 PM   #7
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Since you're looking at later engine/transmission combos the switch will likely be included with the transmissions like the 95 and up 4L80es have.

But it wouldn't hurt to know what you have available, just in case
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is online now   Reply With Quote
Old 03-16-2016, 08:48 PM   #8
Keen amature
 
martin300662's Avatar

 
1975 20' Argosy 20
Chestfield , Kent
Join Date: Mar 2014
Posts: 2,107
I think my 'swap' options are simple....

I am keeping my fingers crossed the little 350/TH350 hold out until it gets back to UK.

If it does I am going the try and pick up a 8.1L/Allison in a running vehicle and ship that as well (so I have all the parts to do the electronics swap).

If my luck runs out and we have to swap sooner then I can only install another 350 (probably a (#19210009) 350HO/(#19260380) 4L65E/(#19212657) transmission controller), so that the specification is the same as a VIN for registration in UK.

If I can't find a suitable 8.1 I think will buy and ship the 350HO/4L65E/controller with Bella so I am ready for the inevitable.
__________________
martin300662 is online now   Reply With Quote
Old 03-16-2016, 09:35 PM   #9
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,040
Images: 11
http://www.yogisinc.com/index.cfm/pa...06/prd4206.htm


Name:   ImageUploadedByAirstream Forums1458182101.648565.jpg
Views: 133
Size:  30.1 KB


Talis gentium ceciderunt.
__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Old 03-16-2016, 09:38 PM   #10
Rivet Master
 
J. Morgan's Avatar

 
1972 31' Sovereign
1975 31' Excella 500
Currently Looking...
Benton , Arkansas
Join Date: Mar 2013
Posts: 5,040
Images: 11
https://www.premierstreetrod.com/det...witch_Kit.html


Name:   ImageUploadedByAirstream Forums1458182335.728152.jpg
Views: 149
Size:  23.3 KB


Talis gentium ceciderunt.
__________________

__________________
The fact that I am opinionated does not presuppose that I am wrong......

J. Morgan is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
back up light/safety neutral switch on turbo 350 turfclubroad Mechanics Corner - Engines, Transmission & More... 2 01-22-2010 08:45 AM
Location of transmission neutral switch? str8strm Mechanics Corner - Engines, Transmission & More... 7 08-30-2009 07:21 PM
Hot Ground/Neutral Reversed Snaken49 Electrical - Systems, Generators, Batteries & Solar 14 08-23-2009 04:27 PM
Open neutral diagnosis? markdoane Lights - Interior & Exterior 3 08-07-2009 08:33 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:50 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.