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Topic: My transmission temperature gauge hardly moves (Read 722 times) previous topic - next topic

My transmission temperature gauge hardly moves

Transmission temperature gauge moves very little during travel, level road and some hilly terrain using lower gear and retarder.

Re: My transmission temperature gauge hardly moves

Reply #1
Mine (98 U320 6 speed) will generally stay put unless it's getting a good workout. Mostly from the retarder on big descents. Up hill not nearly has much provided I don't pull to big a gear. Down shifting is your friend. I monitor the heat through a vmsPC.
Jerry & Nona and Kimeru the cat that thinks she's a dog
1998 36' WTFE U320  #5314 Motorcade #17711
USAF 1975-1995
2019 Subaru Crosstrek 'toad'
2003 Subaru Legacy touring car
jerry Fincher | Flickr

Re: My transmission temperature gauge hardly moves

Reply #2
Transmission temperature gauge moves very little during travel, level road and some hilly terrain using lower gear and retarder.
The factory gauge doesn't show the retarder temps. When I got the VMSps I found that when the gauge was reading 210 the  retarder temp was over 250
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: My transmission temperature gauge hardly moves

Reply #3
There is a huge difference between the gauge on the dash and our VMSps  One of the best items we have purchased for our coach dealing with mechanical conditions!  On our '98, we never thought we were getting the trans temp that hot when looking at the gauge, boy were we surprised when we added the VMSps to our 2000 coach.  These same grades decending down some really steep down grades would see temps up in the 240 to 250 range.  Even with Transcend installed in both.  Like Bigdog mentioned, down shifting to a lower gear is your friend.  Coming up through Utah on Saturday, we watched the temps closely and kept them down by downshifting.  Yes, your temps will go up in climbing as well if you are not downshifting to a lower gear.  You will see the trans temps go up then.  There are some really steep grades out west and if you haven't driven out there yet, you are in for a real eye opener!  Rule of thumb, what ever the gear you are in climbing, use that same gear in descending!
Joe & Dottie Allen
Sold!  December 2023.      2000 U320; build # 5645
Our coach " Maxine"
Motorcade #  15922;  Escapee 150950; FMCA F330833; Boondockers Welcome;  Harvest Hosts;  Thousand Trails
'98 U320 from 2000-'06
USAF '62-'66

"Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for." ―Epicurus

Re: My transmission temperature gauge hardly moves

Reply #4
Side note:  Your weight of your coach has some influence as well with temps in general!
Joe & Dottie Allen
Sold!  December 2023.      2000 U320; build # 5645
Our coach " Maxine"
Motorcade #  15922;  Escapee 150950; FMCA F330833; Boondockers Welcome;  Harvest Hosts;  Thousand Trails
'98 U320 from 2000-'06
USAF '62-'66

"Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for." ―Epicurus

Re: My transmission temperature gauge hardly moves

Reply #5
My dash transmission temp gauge reacts to retarder(MD3060R) use immediately.  It will go over 210 on just a normal stop from 60MPH.  During normal driving the trans temp hangs right with the engine water temp. 
Pat/Blue Angel
1995 U240 36ft
MC# 16511
Build# 4653

Re: My transmission temperature gauge hardly moves

Reply #6
Is the VMSps gauge replacing the existing gauge or an an on?

Re: My transmission temperature gauge hardly moves

Reply #7
Yes on the downshifting.  Better engine compression retardation in itself.  Helps some.  From what I think I have seen in posts here some of the trans/retarder auto trans downshifting might be not working fully with the brake light disconnect on retarder  mod. 

That mod is a big plus for me as the ability to use the retarder with the cruise control mostly  automates the up and down grade use.

As was posted having the retarder come on down grades does help you notice if you are exceeding the speed limits if set at the limit.

I looked at VDO's gauges offered and can only find the zero to 400 degree model.

The VPMS's trans temp display on the computers screen is more helpful as was stated here. 

I tend to use the retarder primarily until getting close to 240 degrees then turn if off and start using the service brakes until the trans temps drop 20 degrees or so then start using the retarder again. Alternate.

Rarely do I need to go slow.  Wolf creek pass comes to mind where I did reduce my overall speed substantially.  Rare.

The coach and toad at 36,000 pounds combined do use the braking systems harder than normal but well within their limits if you have the brakes in their best condition.  Weaker brakes make the retarder work harder. 
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: My transmission temperature gauge hardly moves

Reply #8
 
Quote
My dash transmission temp gauge reacts to retarder(MD3060R) use immediately.

Same here on all my coaches. I just keep an eye on it. The Allison manual indicates that the top temp for the transmission sump is 250F at which point it inhibits shifting.
jor
93 225
95 300
97 270
99 320

 

Re: My transmission temperature gauge hardly moves

Reply #9
Jor do you have a link for the Allison info?
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4