47RE Experts - Rebuilding Overdrive - Have question

[joestewart]

This is the 47RE out of my 1996 Dodge 2500. Bone stock. I burned up the clutches when I was towing. This is my second 47RE rebuild.

I disassembled this transmission and replaced all the clutches and steels. I have the main case assembled and ready to mate up to the overdrive.

I assembled the overdrive using the ATSG manual. I compressed the spring and installed the wire type snap ring and the waved snap ring.

Then I went to take a measurement for the proper selective intermediate shaft spacer. I placed the overdrive in a holder such that all the components were moved rearward and the output shaft was not loaded. I used tool 6312 and 6311 just like the illustration in ATSG (see photo).

The measurement I get is 0.694 inches. See chart in the attached photo

0.694 inches is LESS THAN ANY OF THE RANGES GIVEN IN THE ATSG MANUAL.

So now I'm trying to figure out what could be wrong.

So the next thing I did is that I took another overdrive unit I had lying around and rebuilt it in the same way with new clutches and steels. When I took the measurement, I got essentially the same number.

Question: What could be wrong here?

I measured the bar that I am using for the measurement and it is exactly 0.5 inches thick, which is correct.

I am thinking that this measurement is dependent upon several factors, but is independent of clutch stack thickness. It would seem like wear in any of the various components would result in an INCREASED MEASUREMENT (not a decreased measurement like the one I am getting).

I stopped by the local transmission rebuilder and ran it by one of the head honchos there and he thought about it for a few minutes and then suggested that I bring it in for him to examine. I kind of want to do this rebuild on my own so I thought I would run it by you guys first.

Does anyone have any ideas what could be causing my measurement to fall out of the ranges given in the ASTG manual on page 134?

Thanks

 

[T-MAN]

Great write up, any chance the the rear bearing isnt seated properly in the retainer?

 

[thatguy69]

I measured to the face of the clutch hub when I did mine but I can't recall how I got my number for the selective. I think t man is right

 

[joestewart]

Yes, I believe that the rear bearing is fully seated in the retainer. The retainer itself is new, and there was little wear in the groove for the retainer. Otherwise, the only things I replaced in this overdrive are the friction discs and steels, and a new "spring seat" (which comes with a new "number 12 thrust bearing". Incidentally, I DID tap on the 6312 tool with a hammer to make sure it was fully seated before taking the measurement.

I forgot to mention earlier that I have disassembled and re-assembled this overdrive no less than four times, making sure that I have all the parts in there correctly and the correct number of discs / steels (I used 10 frictions and nine steels).

Now I am getting real paranoid and measuring the tool. Does anyone know how long the "6312" tool should be? I'm getting 5.6 inches for mine. Can anyone measure theirs? Maybe this is the problem.

Would love to get this issue resolved so that I can get this transmission assembled. Can't wait.

 

[T-MAN]

Here's a few pics, that selective helps set end play, that measurement your taking is a simulation of the intermediate shaft being seated in the output shaft bushing, only 3 things that can alter that measurement aside from you and your tools are . overdrive case casting, output bearing and the brass bushing not being seated all the way in the output shaft. I think from the pics i took you can see what I mean, that tool is a pass through measurement the selective on the overdrive apply piston is another story... Let us know what you find...

 

[joestewart]

Well, the length of my tool may be the problem. Mine is 5.6 inches in length, and that extra 0.100 inches would put me within the range of the values in the table on page 134.

I noticed that this tool has a bevel at one end. Am I supposed to be inserting the beveled end or the squared off end? Or does it make a difference?

Really appreciate your input.

 

[T-MAN]

The groove in the tool is so you can remove the tool from the housing, groove goes up. but im guessing ebay cheated you with close enough on the tooling....

min-max window on that measurement is .0675. your correct if your tool is .100 to long it needs to be compensated for.

 

[joestewart]

Considering this issue resolved! Will proceed with assembly! Thanks T-Man!

I bought that tool at Streetside Transmission Tools, over $100 as I recall.

Streetside Transmission Tools - Automatic Transmission Specialty Tools, Parts, Rebuild Kits