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Urgent tranny problems!!!! EDIT PROBLEM FIXED ON PG 2

hunterguy86

hunterguy86

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I put a tranny cooler on my 86 k5 today. Now, when I drive it, it slips between first and second gear. I didnt want to go fast enough to see if it would catch 3rd.

I have it hooked up as follows:

Hard line from tranny to the radiator, out of the radiator to the cooler, out of the cooler back to hard line goin back to tranny.

There are no leaks. The tranny is full of fluid and not over filled.

The tranny was fine before I put the cooler on. The lines aren't kinked or anything.

So why is it slipping now?

I gotta get this thing runnin by the end of this week so I can go home for easter. I need some ideas.
 
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I'd run the lines back through the cooler in the radiator only ,bypassing the new cooler and see if the condition goes away.it is possible that new cooler could be faulty restricting your transmission line pressure.
 
When I changed my radiater,I have a cooler as well,I was having a liittle problem the tranny actin funny.I finally just floored it.Not recomended,but hey worked for me.I would bypass it and try it.
 
I checked my tranny fluid and it is full. Today i'm gonna bypass the cooler and see if it makes any diffrence.

Could my cooler be to big?
Maybe the tranny is running to cool?
 
not real sure but could putting in a aux. change your line pressure on the 700? just a thought since the 700 uses line pressure to shift?
 
hunterguy86 said:
I checked my tranny fluid and it is full. Today i'm gonna bypass the cooler and see if it makes any diffrence.

Could my cooler be to big?
Maybe the tranny is running to cool?
Click to expand...
No way its running to cold.

Are you checking the fluid when the truck is warmed up and with the truck running?
 
hunterguy86 said:
Could my cooler be to big?
Maybe the tranny is running to cool?
Click to expand...

Well, mine might shift a little harsh at -20F, but it still shifts, so I'm gonna have to throw out the "too cool" possibility. The only problem with being too cool is that it won't warm up enough to evaporate any moisture that condensed inside. But that's a long-term problem, not immediate.

How about if you disconnect the cooler and blow through it with compressed air to make sure it is not blocked somewhere?

Other than too much restriction, it has to be a fluid level thing or air trapped somewhere...unless you knocked some junk loose somewhere and it's sticking in something.
 
You know what, these trannys are infamous for going bad after a fluid change because new fluid dissolves stuff that has been sitting there for years. Before this cooler install, when was the fluid last changed?
 
The fluid was changed a few weeks ago and this tranny was rebuilt about a year ago. So everything should still be good.


Any more thoughts on the line pressure idea?

How about air in the lines?

Should I maybe pull the return line off and let it pump fluid for bit and hook it back up?

I checked the fluid after i let the truck idle for a bit and then drove it. So it was pretty much at opertating temp.

I didnt have a chance to look at it today but I will be getting to it tomorrow.


keep those ideas coming
 
Thats what I was thinkin with mine after the radiater swap(air in the lines)don't know if thats possible.I drove mine three or four times actin funny ,not really slippin,more like a vibration after the the converter locked up 35-45mph.So like I said I got up to problem speed and floored it and all is good now:D
 
Is the tranny getting hot?
You may have a clogged cooler, pull the line coming out of the cooler and start the truck (have a bucket handy) if little to no fluid comes out you have a clogged cooler.
Other then that it has to be a fluid level problem.
A cooler isnt going to affect the PSI much if any at all.
 
I drove the truck today. It seemed to shift but not right at all. It would shift through the gears but the 1-2 shift was really late and it banged into gear. The 2-3 shift came sooner that it normally would and kinda banged a bit. I checked the fluid and it was perfectly fine. It was exactly full.

I figured that the cooler may be the problem so I took off the lines and hooked it back up stock. Then when I drove it, it wouldnt even shift out of 1st.

I'm lost here yall, give me some ideas.


Should I try adjusting the TV cable?
 
hunterguy86 said:
I drove the truck today. It seemed to shift but not right at all. It would shift through the gears but the 1-2 shift was really late and it banged into gear. The 2-3 shift came sooner that it normally would and kinda banged a bit. I checked the fluid and it was perfectly fine. It was exactly full.

I figured that the cooler may be the problem so I took off the lines and hooked it back up stock. Then when I drove it, it wouldnt even shift out of 1st.

I'm lost here yall, give me some ideas.


Should I try adjusting the TV cable?
Click to expand...
Sounds like the governor gear, its just odd that it would do it on a fresh tranny after just adding a cooler.
 
Well I pulled the governer gear and all was well with it so I decided to adjust the TV cable.

Turns out thats all it needed. Shifts like she always has now!!!!
 
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