3 Sp RAT/RAN Manual Trans Rebuild - Issues and Questions

[bulletpruf]

So, I rebuilt my Dana 20 transfer case and extension housing and I need to rebuild the original 3 speed manual next for my '69 project. I'm having difficulty finding a good video on YouTube; anyone have a good thread, video, or similar?

Thanks,

Scott

 

[bulletpruf]

I got it apart, but it's a slightly different process than the passenger car transmissions, so it took a bit of figuring out. The Shop Manual isn't a model of clarity, and there are no YouTube videos of a RAT rebuild that I could find.

And now in pieces. I disassembled the gear cluster since I took this pic.

I did end up finding a good thread here with some helpful details - https://classicbroncos.com/forums/threads/3-speed-rat-noise-after-rebuild.325701/

Need to see if I can make a counter dummy shaft or find one - part number is T63-7111-B - looks like it's .865" diameter x 5.070" long. The counter gear itself is 5.6" long, and the original counter gear shaft is roughly 6.8" long, and I'm getting .870" or so for diameter. If I had a spare, I could just cut down to size.

I also posted another thread about plastic thrust washers; the kit that Wild Horses sells is from USA Standard Gear has these. I'll use my original counter gear washers and I found some NOS reverse idler washers on eBay.

Will work on getting the gear cluster reassembled before I start work this morning.

 

[Oldtimer]

The counter gear shaft is a light press fit in front of case, to keep gear oil inside.
Dummy shaft needs to be a bit smaller so it will slide thru front of case, but large enough to keep needle bearings in place.
I would look at EMT conduit, copper pipe, pvc pipe, black iron gas pipe, etc. for a diameter that will work, and cut to length needed.

 

[.94 OR]

If you ended up with a thinner walled PVC that was slightly oversized, you could cut a slit in it and compress into the bearing cavity and let it's external pressure hold it in place.

 

[bulletpruf]

The counter gear shaft is a light press fit in front of case, to keep gear oil inside.
Dummy shaft needs to be a bit smaller so it will slide thru front of case, but large enough to keep needle bearings in place.
I would look at EMT conduit, copper pipe, pvc pipe, black iron gas pipe, etc. for a diameter that will work, and cut to length needed.

Excellent idea. Looks like 3/4" Schedule 40 PVC is about .840" OD. 3/4" copper tubing may work, but I may have to remove some material (supposed to be .875" OD).

 

[bulletpruf]

Cluster gear is together. That was fairly simple and didn't require a press.

Input and counter gear are loaded with needle bearings - 25 on each side for the cluster gear and 15 for the input.

Seal is installed in bearing retainer.

O-rings installed on shift arms.

 

[Oldtimer]

And before mating to extension housing, is the double lip seal installed in the extension?

 

[bulletpruf]

And before mating to extension housing, is the double lip seal installed in the extension?

Had to watch my video to refresh my memory, but it's at 6:02 -

 

[cldonley]

There's a shop near me in Clifton, Texas where a friend of mine just got his 3 speed rebuilt out of his 67 F100. Guy has everything and has done it all-if you need some answers I can get his info. Nice job on the video.

 

[bulletpruf]

There's a shop near me in Clifton, Texas where a friend of mine just got his 3 speed rebuilt out of his 67 F100. Guy has everything and has done it all-if you need some answers I can get his info. Nice job on the video.

If you could get a phone number that would be much appreciated. Thanks! Scott

 

[bulletpruf]

The counter gear shaft is a light press fit in front of case, to keep gear oil inside.
Dummy shaft needs to be a bit smaller so it will slide thru front of case, but large enough to keep needle bearings in place.
I would look at EMT conduit, copper pipe, pvc pipe, black iron gas pipe, etc. for a diameter that will work, and cut to length needed.

3/4" PVC was too thick at 1" but 1/2" galvanized pipe is .853" OD - damn near perfect. Got a 2' piece from Lowes. Thanks again for the suggestion.

 

[bulletpruf]

The counter gear dummy shaft should be the same length as the counter gear, correct? The Ford/Rotunda dummy shaft is about 1/2" shorter than the counter gear, but I"m guessing that's just so it can be used in shorter counter gears in other transmissions.

 

[Oldtimer]

Needs to be short enough to drop into the case, long enough that when you push it thru hole at front of case, to center forward thrust washer, the needle bearings at back of case don't drop out.

 

[bulletpruf]

Needs to be short enough to drop into the case, long enough that when you push it thru hole at front of case, to center forward thrust washer, the needle bearings at back of case don't drop out.

Ok, I'm going to cut it to where it's the same length as the counter gear.

Thanks

 

[cldonley]

If you could get a phone number that would be much appreciated. Thanks! Scott

Standard Transmission Center, Clifton TX 254-675-6464.

 

[bulletpruf]

Standard Transmission Center, Clifton TX 254-675-6464.

Thanks!