Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 07-06-2015, 09:09 AM   #1
Junior Member
Hitechpete's Avatar
Join Date: Mar 2014
Posts: 4
1999 Dip gearbox cooler

Hi, I have a 1999 Monaco Diplomat 36' Motorhome. My radiator is collapsing and I am in the process of having a new radiator built. As part of the process I am removing the internal heat exchanger/cooler and propose to install an external cooler. My questions are: what size does it need to be, and what flow rate should it have, so as to provide adequate oil flow back to the gearbox.
Allison are not proving to be very helpful answering my questions.

Hitechpete is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-06-2015, 09:58 AM   #2
Senior Member
BFlinn181's Avatar

Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 17,910

Allison builds transmissions. Your inner cooler for intake air and transmission cooler were designed to meet engine specifications and need. Check with engine or chassis maker for the numbers you're looking for. Moving cool pack to a new location means more fans and venting of heat, which will require more power from the engine. I'd think of putting it back the way it was with new components, not re-engineering a carefully thought out original design.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 07-06-2015, 10:06 AM   #3
Senior Member
Skip426's Avatar

Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 15,626
A belated Welcome to iRV2.

My 99, w/ Allison 3060, has an external oil to water cooler, in the lower rad hose, that may not fit if you have a rear rad.
If you have a side rad, I can provide pictures and P/N's if I can find any.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 07-06-2015, 12:21 PM   #4
Junior Member
Hitechpete's Avatar
Join Date: Mar 2014
Posts: 4
Thanks guys

Sorry I forgot to mention that it's a rear radiator.
I believe that Monaco themselves decided to fit external transmission coolers following their debacle with aluminium radiator failures; resulting in gearbox failures due to coolant/transmission fluid mixing.
Hitechpete is offline   Reply With Quote

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
Mechanical Fan Drive Gearbox Oil Change redbaron73 Freightliner Motorhome Chassis Forum 5 06-25-2015 08:02 AM
Transmission Cooler Leak Gary and Judy Alpine Coach Owner's Forum 4 11-13-2014 04:58 PM
4R100 cooler hdossett Ford Motorhome Chassis Forum 5 06-02-2014 02:29 PM
Charge Air Cooler hartk1 Alpine Coach Owner's Forum 10 10-21-2013 05:04 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:47 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.