I've been reading up a lot on the 4L80E swap. I was wondering what everyone did as far as using the stock 4L60E lines to the 4L80E.

I read one thread where the person said that the rear most port on the 4L80E is a different fitting than the 4L60E cooler lines and that if it is not corrected you could burn up the rear of the transmission. Can anyone shed some light on this?

I read that the front most cooler line can be straightened out to meet the 4L80E port, which is what I will do.

For the rear, what I was 'planning' on doing was just cutting the 4L60E line and using rubber transmission hose extending it however long it needs to be (extend the stock line using the rubber hose and clamps). I hope this will work, but if not--------

I saw that a lot of people are using AN fittings to extend the rear most line to the 4L80E. Can anyone point out the exact fittings needed to do this?




one other thing, I read at one place that the 4L80E needs a special additive other than the fluid (which I read also to use Dexron III). Let me know if this is correct

thanks guys!

 

I use the stock pushlock fittings from my old 60e. Haven't had an issue with the lines or leaking. I just double hose clamp them to prevent leakage. Not as fancy as AN fittings and braided line, but it does the same job.

 

u can just bend the front line to fit and the rear line has to be lengthened(i used 100psi rubber hose)

 

I am aslo looking into cooler line info for if i swap a 80E in. Any one have pics? part numbers to help us, or links to other threads with good info? thanks!

 

Thanks guys! looks like I'll stick to my original plan with no more worries

 

The rear fitting is different (I think only on the 99 up 80e's). It looks the same from the outside of the tranny, but on the inside there is a nipple that goes into the center support. That nipple supply's the fluid to the rear of the tranny for coolant and lubrication. You will burn up a tranny in 200 miles if you do not have this, and 2 of them in 400 miles. Ask me how I know. Lol. When I bought my tranny the original fitting was removed, and it was a pain to figure out. Here is a pic of 2 60e fittings, and the different 80e fitting.

 

well **** lol, how do I know if mine needs that longer fitting or not? (I have a 1998 4L80E) good thing you replied, I would be PISSED if I had to rebuild this thing 200 miles after I got it in lol

I wonder if I can buy that fitting somewhere

 

Hey Smokeshow, did you see this? Any chance you have the wrong fitting causing a lack of lube problem?

 

well hell i think ive found my issuse with over heating aswell, and i just burnt up my 80e, and being rebuilt right now... your a life saver! can we get the admins to add this to the write up???

 

Please tell me you have the right fitting in the rear of the case.