RAT/RAN Tranny Flush?

[VeryTALONted]

I have a 67 Bronco U15 with a 289.

I have noticed a small leak around the tranny's drain plug. I want to drain all the fluid, inspect the drain plug, fix whatever is causing the leak, 'douche' out the tranny, and replace the fluid with something that will properly lubricate the transmission.

I tried to search around the web for info on doing this, but The RAN/RAT trannies seem to be a ghost that either never breaks or is replaced with something else.

So my questions are:

1) What kind of tranny does my Bronco have?
2) How much fluid does this tranny take?
3) What kind of fluid does it like?
4) What would cause the drain plug to leak?
5) Will Teflon Tape help to seal the drain plug apon re installation?
6) What is a good product to 'douche' or clean the tranny out with?
7) Should I use a friction modifier?

Thanks for any insight you can provide!

;D

 

[73azbronco]

1966/69: C3UZ-7061-E .. Output Shaft / RAN = 13 9/16" long / 32-37-28 spline teeth

1966/69: D0TZ-7061-A .. Output Shaft / RAT = 16 9/32" long / 32-37-28 spline teeth


Manual uses 3.5 pints.

No modifier.

 

[VeryTALONted]

1966/69: C3UZ-7061-E .. Output Shaft / RAN = 13 9/16" long / 32-37-28 spline teeth

1966/69: D0TZ-7061-A .. Output Shaft / RAT = 16 9/32" long / 32-37-28 spline teeth


Manual uses 3.5 pints.

No modifier.

So the output shaft is longer/shorter?

Do you have pics of where to measure from and to?

What type of fluid?

 

[73azbronco]

Gonna have to wait for the super gurus to come forward, can't say which is which offhand.

Fluid can be any good gear oil.

 

[broncnaz]

The ran tranny he listed is for a 6cyl engine. All bascially the same tranny as far as fluids are concerned. As for the drain plug yes you can use teflon tape it may help seal it. I would look at the hole its always possible someone overtightend the plug and cracked the housing.

 

[VeryTALONted]

The ran tranny he listed is for a 6cyl engine. All bascially the same tranny as far as fluids are concerned. As for the drain plug yes you can use teflon tape it may help seal it. I would look at the hole its always possible someone overtightend the plug and cracked the housing.

Oh OK.

Anything else?

 

[matts70]

There will be a metal tag attached to the side of your transmission that identifies whether it's a RAT or a RAN. It's probably covered in a thick layer of grease and dirt, but it's there. Passenger side, near the front, I believe.

Do you plan on pulling the transmission, or leaving it installed on the vehicle? If it's shifting fine and you don't intend to pull it, there's no sense in trying to wash the inside. In fact, you'd probably do more harm than good. The inside of the plug has a magnet on it, BTW. Best way to clean it out would be just like an oil change--drive it, get it hot, then pull the plug. Put a wrap of teflon tape on before you reinstall.

It uses a heavier gear oil, I believe. Somebody else will know what weight. If not, a local parts store probably will know. If not, just go to another one.

 

[broncnaz]

Standard gear oil is fine. weights are up to you. I kinda like to run the 75w-140 semi syntethic myself.

 

[VeryTALONted]

The tranny shifts fine, but drips a little bit of fluid. The exhaust pipe is there to catch the dripping and makes I nice odor. That is what I am wanting to stop.

Thanks for all the ideas, I live in West TX and the Bronco is driven only on nice days so it sees temps of 60-110*F, what fluid would be ideal for those enviorments.

 

[Explorer]

Make sure you can remove the fill plug first. Kinda late after it's drained and then realize you have a problem.

 

[VeryTALONted]

Make sure you can remove the fill plug first. Kinda late after it's drained and then realize you have a problem.

Noted....

 

[VeryTALONted]

What gear fluid....?

 

[broncnaz]

What does your local store have anything between 75-140 weiight is fine.

 

[VeryTALONted]

So to recap:

1) What kind of tranny does my Bronco have? Check for a tag
2) How much fluid does this tranny take? Till it is even with the fill plug
3) What kind of fluid does it like? 75-140
4) What would cause the drain plug to leak? Being too tight
5) Will Teflon Tape help to seal the drain plug apon re installation? Should be OK
6) What is a good product to 'douche' or clean the tranny out with? Change it while Hot
7) Should I use a friction modifier? No

Sound about right???