My tranny
 

I replaced the tranny line's to the 2nd cooler in front of driver's side tire with hyd. hose(heavier duty) cause the other's where leaking. My tranny tho seems to come in and out of OD alot mostly when cold, sometime's seems like it stay's in 3rd for longer then it should and will sometime's just come out of OD and go into 3rd, is my tranny going? Fluid's good.

Have you tried adjusting the TPS?

When it warms up is it fine? I'm pretty sure the tranny looks out OD until the engine warms up to a certian point to aid in warming up the engine. Temp sender dirty/faulty?

New to these trucks and pretty new to diesel's, so don't know what a TPS is?

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It does seem like when its warm it shifts fine, every now and than it will do it not very often when warm.

I would try doing this first.

https://www.dieselbombers.com/1st-ge...ensor-tps.html

This is probably a dumb question but did you make sure you topped off the fluid after changing the hoses? Also, is it possible you could've gotten an air pocket in the system during the swap? Might just take a little driving to work it out.

Yes sir, it fluid is between the s and a of the safe mark.

Did you try the TPS adjustment yet?

x2
the only 1st gen experience i have is parting one out, but that hydraulic hose is thicker, is the inner diameter the same?

just a thought...

No not yet, today I will as I finally have a day off today.

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Yes sir it is.