How hot does a manual trans get?

Ataylor

Full Access Member
Joined
Oct 29, 2009
Posts
295
Reaction score
0
Location
Placerville, Ca
Just curious if anyone has a gauge on their manual transmission. How warm do they run while towing? ZF-5 or T-19

Just curious,

Thanks,
Archie
 

FordGuy100

Registered User
Joined
Apr 1, 2006
Posts
8,749
Reaction score
282
Location
Silverton, OR
My guess is as hot as a rear diff? No clutches or torque converter to heat up tranny fluid like a auto has.
 

BrandonMag

Dana 50 rebuilder
Supporting Member
Joined
Oct 20, 2009
Posts
1,185
Reaction score
99
Location
Oregon east
I installed a temperature gauge on my ZF a couple of months ago. I've towed my trailer for about 3K miles now and I can report that my ZF gets HOT! As in: 265* occasionally. That's towing, though. Usually driving around town after a half hour I'll be up to 190*. One of these days I'm going to install a tranny cooler.
 

Dieselcrawler

Professional wrench holder
Staff member
Joined
Jun 4, 2010
Posts
5,284
Reaction score
617
Location
Quakertown Pa
i know they get warm, the zf6 speed in my work truck has a factory cooler on it and after long trips i can feel the heat in the shifter.
 

Agnem

Using the Force!
Supporting Member
Joined
Jan 10, 2005
Posts
17,067
Reaction score
374
Location
Delta, PA
One thing to remember about these transmissions.... they are alluminum. They are alluminum HEAT SINKS. The will suck heat right off of the motor, so you can expect them to get to at least water temperature at a minimum on lenghty trips.
 

oldblue05

PIN IT TO WIN IT!!!
Joined
Jul 9, 2009
Posts
581
Reaction score
0
Location
Caldwell, Tx
One thing to remember about these transmissions.... they are alluminum. They are alluminum HEAT SINKS. The will suck heat right off of the motor, so you can expect them to get to at least water temperature at a minimum on lenghty trips.

never thought of that, but makes perfect sense
 

lotzagoodstuff

Supporting Member
Supporting Member
Joined
May 19, 2007
Posts
2,729
Reaction score
673
Location
Carmel, IN
Just remember that the ZF5 doesn't use the oil for anything hydraulic, just lubrication, unlike an auto which has a pump and requires a little more out of the fluid.

Not saying a cooler is a bad idea, just saying that getting ATF (or gear oil for those of you running it) hot in a manual trans isn't as big of a deal as keeping it cool in an automatic.

Also remember that if you are going to install a cooler on a ZF5, you'll need a circulation pump as I don't think there's a factory provision for any external cooler.

Interesting thread nonetheless.
 

MIDNIGHT RIDER

Full Access Member
Joined
Sep 29, 2005
Posts
4,639
Reaction score
38
Many of the Dodge/Cummins guys have fabricated pumped coolers with the return nozzles brazed into the PTO plates such that the fluid sprays directly on the main-shaft bearings.

Most also include a filter head in the plumbing.

I have a system all designed in my skull, but have yet to implement it.

Also, there are some finned aluminum "blocks" that replace the PTO covers and provide a couple extra quarts of lube capacity, plus also being heat-dissipaters; those are very popular on the Dodge sites, yet I seldom see mention of them on here. :)
 

MIDNIGHT RIDER

Full Access Member
Joined
Sep 29, 2005
Posts
4,639
Reaction score
38

OLDBULL8

Good Morning Ya'll.
Supporting Member
Joined
Feb 12, 2009
Posts
9,923
Reaction score
338
Location
Delphos , Ohio
Don't have a manual tranny, but just read in a 1938 Popular Mechanics mag. that putting a rubber hose over the stick will absorb the gear noise. Might even insulate the heat from it. Good Idea?
 

Diesel_brad

Dunce
Joined
Nov 8, 2008
Posts
6,099
Reaction score
4
Location
gilbert pa
Don't have a manual tranny, but just read in a 1938 Popular Mechanics mag. that putting a rubber hose over the stick will absorb the gear noise. Might even insulate the heat from it. Good Idea?

I do that on big trucks;Sweet.
Kinda hard to do on a ZF with the tapered shifter
 

towcat

Supporting Member
Supporting Member
Joined
Jun 24, 2004
Posts
18,196
Reaction score
1,439
Location
SantaClara,Ca/Hamilton,TX
Don't have a manual tranny, but just read in a 1938 Popular Mechanics mag. that putting a rubber hose over the stick will absorb the gear noise. Might even insulate the heat from it. Good Idea?
can't hurt...but a ZF shift stick is already a composite metal/rubber sandwich.
 

towcat

Supporting Member
Supporting Member
Joined
Jun 24, 2004
Posts
18,196
Reaction score
1,439
Location
SantaClara,Ca/Hamilton,TX
here's another thing I do.
with age and miles, the upper part of the stick will separate from the rubber middle. this is good for two reasons. One. there's now only a 4 inch stub of a shifter for a truck thief to grab onto when they attempt to steal my truck. It takes at least three gears to get through an intersection from a dead stop. they will be busy shifting and not going fast or far. As a result, it makes it very easy to screw a .357 into their ear while they are still in the parking lot. Coupled with the conversation starter of "MSG and hot water will clean out blood and brain matter from my interior." self-preservation will kick in most opportunistic thieves at that point. :D
The second part is the removable shift handle is hollow. it can be filled with lead to the point where the rubber fits into the handle. two good things come from this. one. the vibration from the trans becomes non-existent, two. the handle doubles up as a billy club.
 

Attachments

  • SL374371.JPG
    SL374371.JPG
    288.2 KB · Views: 6
  • SL374370.JPG
    SL374370.JPG
    288.4 KB · Views: 8

Latest posts

Forum statistics

Threads
91,345
Posts
1,130,760
Members
24,143
Latest member
Cv axle

Members online

Top