T-cases getting hot driving on highway.

Boonie Buster · Sep 2, 2009

So I have a 700r4 that seems to be overheating, and then to top that my NP203/NP205 are getting super hot after only driving 50 miles... Are there bearings that are worn and causing heat? Or is soemthing misaligned? I mean they are almost too hot to the touch. I just dont get it. I'm running 5.13 gears, which most people run 5.29s.... They have ample oil, but, when they get hot it seems to push oil out the vent or one of the upper doubler bolt holes... I'm stumped. Something is messed up and i dont know what. Do I have my tranny and t-cases misaligned? In 4th gear around 55mph, there is a slight vibration, but when i drop it into 3rd it really picks up. I think part of that is my rear pinion needs to be shimmed a little. But would that vibration transfer heat and wear to the t-case like that?!

CHOP SHOP · Sep 2, 2009

Boonie Buster said:
So I have a 700r4 that seems to be overheating, and then to top that my NP203/NP205 are getting super hot after only driving 50 miles... Are there bearings that are worn and causing heat? Or is soemthing misaligned? I mean they are almost too hot to the touch. I just dont get it. I'm running 5.13 gears, which most people run 5.29s.... They have ample oil, but, when they get hot it seems to push oil out the vent or one of the upper doubler bolt holes... I'm stumped. Something is messed up and i dont know what. Do I have my tranny and t-cases misaligned? In 4th gear around 55mph, there is a slight vibration, but when i drop it into 3rd it really picks up. I think part of that is my rear pinion needs to be shimmed a little. But would that vibration transfer heat and wear to the t-case like that?!

**** it gets expensive and frustrating trying to daily drive a WHEELER.

Its just not made for the road dude. Get a trailer and a real truck.:awesomework:

Damnyankee · Sep 2, 2009

Boonie Buster said:
So I have a 700r4 that seems to be overheating, and then to top that my NP203/NP205 are getting super hot after only driving 50 miles... Are there bearings that are worn and causing heat? Or is soemthing misaligned? I mean they are almost too hot to the touch. I just dont get it. I'm running 5.13 gears, which most people run 5.29s.... They have ample oil, but, when they get hot it seems to push oil out the vent or one of the upper doubler bolt holes... I'm stumped. Something is messed up and i dont know what. Do I have my tranny and t-cases misaligned? In 4th gear around 55mph, there is a slight vibration, but when i drop it into 3rd it really picks up. I think part of that is my rear pinion needs to be shimmed a little. But would that vibration transfer heat and wear to the t-case like that?!

too much oil in them will cause both of these problems

Boonie Buster · Sep 2, 2009

Damnyankee said:
too much oil in them will cause both of these problems

really?! too much oil will make them hot? :eeek: That could be, I did fill them up pretty good. :redneck: Now could it be i'm using too thick an oil also? I'm using an 80w90 I think... :eeek:

Damnyankee · Sep 2, 2009

Boonie Buster said:
really?! too much oil will make them hot? :eeek: That could be, I did fill them up pretty good. :redneck: Now could it be i'm using too thick an oil also? I'm using an 80w90 I think... :eeek:

they should only be half full.

and yes, too much oil will make them run hot.

they oil type should be fine.

Boonie Buster · Sep 2, 2009

Damnyankee said:
they should only be half full.

and yes, too much oil will make them run hot.

they oil type should be fine.

hmm, they couldnt be more than half full then.... the fill plugs i have couldnt do more than half even on an incline....:eeek:

Damnyankee · Sep 2, 2009

Boonie Buster said:
hmm, they couldnt be more than half full then.... the fill plugs i have couldnt do more than half even on an incline....:eeek:

hmmm... wierd....

I've had heating and spueing issues on many gear boxes (not just automotive) that were over full.

crash2 · Sep 2, 2009

Damnyankee said:
too much oil in them will cause both of these problems

Whats the theory behind this?

Damnyankee · Sep 2, 2009

crash said:
Whats the theory behind this?

Most gear drives are "pumps" when to much oil is in them they push oil out through the breather.

Also too much oil will cause Airation (sp) (foaming). this actually decreases lubrication causing heat.

crash2 · Sep 2, 2009

Damnyankee said:
Most gear drives are "pumps" when to much oil is in them they push oil out through the breather.

Also too much oil will cause Airation (sp) (foaming). this actually decreases lubrication causing heat.

Out the breather I can see if its WAY full. As for getting foamy due to too much oil. I run my t-case over filled, never blow oil out it and never gets hot. And this is down at the hammers where you have to drive for miles, in the heat and moving good. It gets warm but thats to be expected. Also if its getting foamy--I would look at why, not due to the level IMO. Typicly is to using poor lubricants...

Damnyankee · Sep 2, 2009

crash said:
Out the breather I can see if its WAY full. As for getting foamy due to too much oil. I run my t-case over filled, never blow oil out it and never gets hot. And this is down at the hammers where you have to drive for miles, in the heat and moving good. It gets warm but thats to be expected. Also if its getting foamy--I would look at why, not due to the level IMO. Typicly is to using poor lubricants...

it may have something to do with the type of gear setup.

I work mostly with planetary style gear boxes.

and over filling is the #1 issue. (foaming, and pushing oil out the breather).

I could be way off base on his 203/;205 setup, but i would not discount the posibility.:beer:

crash2 · Sep 2, 2009

Damnyankee said:
it may have something to do with the type of gear setup.

I work mostly with planetary style gear boxes.

and over filling is the #1 issue. (foaming, and pushing oil out the breather).

I could be way off base on his 203/;205 setup, but i would not discount the posibility.:beer:

It may be possable--just giving what I have learned---I run synthetic (redline) in my boxes.

tech6023 · Sep 2, 2009

re

I would say bearing issue, Can you heat any type of bearing noise? i assume it may be hard depending on size of tire. I could see a bearing causing a vibration from the extra clearance causing the shafts to move. possible its get so hot that the fluid expands, hard to believe 80w90 would get that hot.

Corey Y · Sep 2, 2009

NP203s and NP205s will always be warm/hot after driving on the road. The auto transmissions are aluminum and the heat will be transfered into the cast iron t-cases adding to the increased temps.

Boonie Buster · Sep 2, 2009

tech6023 said:
I would say bearing issue, Can you heat any type of bearing noise? i assume it may be hard depending on size of tire. I could see a bearing causing a vibration from the extra clearance causing the shafts to move. possible its get so hot that the fluid expands, hard to believe 80w90 would get that hot.

It has new output bearings and input bearing, not the internal needles, but what i dont understand also, is when i have the driveline on, and in neutral, i can wiggle, up and down, the driveline quite a bit right at the t-case yoke, but when the d-line is off it's hard to wiggle the flange to get the same movement out of it. it's weird, it's as if the t-case output is loose, but only when you get the d-line on for leverage.... maybe the CV in the d-line is bad, but something else is going on, I just dont feel there should be any play in that output...make sense?:eeek: (hard to describe on the intranets

)

Damnyankee · Sep 2, 2009

there shouldn't be any play, they should be preloaded bearings if i'm not mistaken.

you can move it with the shaft because there is more leverage.

crash2 · Sep 2, 2009

Boonie Buster said:
It has new output bearings and input bearing, not the internal needles, but what i dont understand also, is when i have the driveline on, and in neutral, i can wiggle, up and down, the driveline quite a bit right at the t-case yoke, but when the d-line is off it's hard to wiggle the flange to get the same movement out of it. it's weird, it's as if the t-case output is loose, but only when you get the d-line on for leverage.... maybe the CV in the d-line is bad, but something else is going on, I just dont feel there should be any play in that output...make sense?:eeek: (hard to describe on the intranets)

Slip yoke or non slip yoke?

And your telling us you can't determine between slop in your CV and output?

Boonie Buster · Sep 2, 2009

Damnyankee said:
there shouldn't be any play, they should be preloaded bearings if i'm not mistaken.

you can move it with the shaft because there is more leverage.

I know it's cus of the leverage, but i thought these weren't preloaded... :eeek: They're straight caged bearings.... not really sure how you preload those...:redneck:

Boonie Buster · Sep 2, 2009

crash said:
Slip yoke or non slip yoke?

And your telling us you can't determine between slop in your CV and output?

it's a fixed yoke for a toyota flange.

sorry, i wasn't specific enough, it is slop in the t-case flange. but i cant recreate it with the d-line off, leverage issue.