66RFE Rebuild 

Thanks for watching.

Thanks

Glad you liked it, thanks for watching.

These seem to have bad valve body problems. Had one recently that we went through 3 new valve bodies before we got one that lasted. Same problem with towing.

Yes you can. The pump cover however is the same as the 45rfe.

@@CurmudgeonTransmission can I reuse that pump cover?

@@debrisremoval3151 Yes, as long as it's not damaged.

@@CurmudgeonTransmission is remco a good kit to buy? I can only order from a certain website that starts with an A. Remco master kit stage 1 red friction and steels

I don't know anything about Remco. I use either Transtec with Raybestos clutches or the dealer kit.

Is this before or after a rebuild?

I have not ever used any of their products. I repair them myself. Maybe someone else has.

They are a pretty decent transmission.Hope all goes well no matter what you decide.

Some say don't leave the flapper out, others say it causes no problems. Has been fine so far. This is basically a 68RFE with the difference being how the overdrive/underdrive stack up goes and spring configurations in the valve body. They are supposed to have big problems with the overdrive clutches like they all do but worse. Even though we did all the updates to it and flat sanding everything, we still had to end up replacing the valve body on it. Just would not work properly all the time. Valve bodies are just pure junk on these units.

@@CurmudgeonTransmission yep they are junk and have always been (valve body) yet they have 4 versions of it. from the 45,545,68 and now 66 .. you would think they would have made a good one by now.......the Japanese makers would have fixed it for sure..American and German manufactures just don't care it seems

You have something assembled incorrectly.

Neutral switch problem, torn seal between VB and case, reverse clutch assembled incorrectly or low/reverse switch valve stuck or fell out while cleaning the valve body would be what comes to mind.

@@CurmudgeonTransmission ya i think they put it together wrong. Come to find out i took it to the worst people. They will not be touching it again. Thanks a lot for the info

If you need another shop try here. www.atra.com/ShopFinder

@@CurmudgeonTransmission thank you kindly

Dr. Tranny (Lubegard). You can find it at Transtar, WIT, Ebay, Amazon and I have seen it at some O'reilly's. I use the blue and green. Gold is no longer available.

@@CurmudgeonTransmission thank you 😊

The 66 is a cross between the 68 and 545. You can use all the clutches for a 68, and is a good upgrade for the O/D and U/D. Get the bonded valve body plate and ream the solenoid switch valve to oversize if you can. There are 2 different sizes so measure your valve first. Go to Sonnax's website and it will show you where to measure. The front half is the same as the 545. From the center support back it is the same as a 68.

Ok as I’m looking a centre support upgrade kit which is for the 68 and was told by the engineer that he wasn’t sure if the 68 and 66 shared the centre support and the he was wondering about clearances in the 4c clutch. Oh I’m completely rebuilding my 66 all bullet parts and upgrades available will be behind a 600-700hp 392 stroker. Also do you happen to know what the spline count on the output shaft (one coming out of the case) of a 65rfe ?

I have never counted the splines. The 66 is the same as the 68, you will want to stay with it. The 65 is the exact same trans as the 545. The only thing that makes it a six speed is the computer strategy.

@@CurmudgeonTransmission yes I understand all that. I’m wondering about the tail shaft of the 65rfe. My truck has a 65rfe with the BorgWarner 44-44 tcase. Got a guy that says he can retrofit a 66 onto a 5.7. He’s only done it on a 2wd. So we need spline count to figure out what we need to mate the 66 to the BorgWarner tcase.

Next time I get one in I will count them, if you haven't figured it out by then.

They go on the line pressure solenoid on the passenger rear of the transmission.

@@CurmudgeonTransmission Thank you lol we may have a few more questions keep an eye on your comments we really appreciate it we spent 2 hours trying to figure this out.. lol we subscribed and will like your videos

@@Syerror23 Thanks. Go to my Instagram and it's easier to have a conversation there.

@@CurmudgeonTransmission Whats your Instagram?

CurmudgeonTransmission@Instagram

Hello 😊

@@CurmudgeonTransmission hi sar

Pretty much leaves the 2C clutch support or solenoid assembly.

@@CurmudgeonTransmission got another valve body on the way. If that doesn’t fix it it’ll be a new center support. Thank you.

Update us one you get it, please

Either buy the factory kit or a Transtec 68RFE kit from WIT or Transtar.

So the 68rfe internals are the same as the 66rfe

Some. It is kind of a half and half unit. The front part and the case is the same as the 545RFE. From the clutch hubs back is a 68RFE. But you can use the clutch stack up in the O/D-U/D drum. Don't remember if I showed it on this video, but do yourself a favor and ream out the solenoid switch valve line up and put an oversized valve in it. They are a huge problem for any of the dodge units. There are two different sizes so to know how to tell go to Sonnax's website and they have instructions on that. I have gotten to where I don't bother to check if it is worn. I just do it on every one I build now.

What was the Transgo kit part number you used? There are 3 different ones on Rockauto for my 2014 3500 6.4