[gresh1003]

I just got finished with the rebuild (revmax rebuild kit, tq, and vb) and have a few questions that I am unsure of.

#1- is it necessary to flush the trans oil cooler or it is it good enough to just take the 2 lines off at the trans when it is removed and let it drain? I have not found anywhere that mentions to do anything further.

#2 is it necessary to remove a check ball after upgrading trans like I have done?
This is all I am waiting for to finish up so all replies are really appreciated!

 

[cerberusiam]

If you did a shift kit remove the check ball for better cooling flow.

The trans cooler will not drain with just the lines off, you will have a quart or so of stuff in there and any accumulated junk. The cooler itself is hard to flush due to the thermostat in it. You almost have to take it out to flush correctly.

Failure to replace or clean it will void oyur warranty at a lot of places becasue it can hold a lot of garbage.

 

[gresh1003]

I have the revmax performance/tow VB. I have no problem with removing the check ball if it is really necessary. Is there really no way to flush the cooler without taking it out? If that is the case how is the rest of the system flushed, more specific the cooler on the lt side of the engine where 1 line goes in before going to the trans. The trans is still out so I want to clean this prior to install.

 

[cerberusiam]

The lines to the front cooler and the heat exchnager are easy, just flush the normal way to clean them out. You have to take the line apart where the check ball is to do it and that leaves the cooler and the short chunk with the check ball that is hard to flush.

There is a thermostat in the cooler that close and bypasses fluid when it is less 140 degrees. Your flush will be less and it will just clean out the the bypass tube, not the main body of the cooler. You have to back flush to clean out the main body and that goe sintot he check ball line and the check ball stops the flushing so you need to remove that line also. All the lines are pointed into the engine bay so it makes it tough to get any type of flushing done on it. Most places just replace it because it is cheaper than the labor to do it correctly.

 

[gresh1003]

In all reality, since all the fluid including the trans pan and TQ will be new, could I not add the standard fluid to the TQ for prime, then add a few quarts to the trans through the fill. Then just leave the return line that goes on the trans off which will allow the new fluid to push the old out. Does this seem legit or am I way off?

 

[Spank1]

That's what I did when I did a trans flush back in the day. I'm not sure if it did the cooler or not but it pushed out a lot of dark fluid. How hard was it to do your trans rebuild. I'll be doing it in a couple of months and was curious if it's as easy as it looks in threads. I would be getting a TC and VB from goerend because I've heard too many horror stories about shift kits. I'm actually looking fwd to it, people with build trans say its the best upgrade they ever did.

 

[gresh1003]

Thanks for the reply! Everything seem ok so far, the job wasn't too bad as long as you take your time and pay attention where everything goes. You will need a torque wrench and shop press or access to it anyway. With the ATSG manual and the Internet sites it is pretty self explanatory. The most difficult thing was the seals in the kit are not marked in anyway and you have to just match them up to where they go by size but not a huge deal. I am pretty mechanically inclined (fighter jet mechanic) and found this a pretty easy job. For anyone that isn't, it may be a little difficult. I kept thinking something was wrong due to how easy it was coming together. The shifts are completely different from stock but not hard, I would prob prefer a little firmer shifts but it is what it is. Revmax has been nothing but awesome with customer service and tech support every time I contacted them. Any more questions let me know!