Getrag rebuild

[WLehto]

I'm new to the forum and have recently purchased a 91 dodge for a conversion. Looking for some advice on what I need to replace in my Getrag. I have not rebuilt a transmission before so I'm kind of unsure what is normal wear. First I bought the truck knowing it popped out of four gear right away. It seemed to shift fine into all the other gears. I know have removed the transmission and have gotten the top cover off and have removed the input and output shafts. The 3-4 shift fork was worn down. The 3-4 synchro teeth also look worn down. I'm not sure if the clutch gear teeth on the input shaft are worn or are ok, is there spoused to be a flat spot on the teeth? There was also a chunk out of 5th gear. Also there were shims on the front bearing retainer. There were no shims on rear for the output or the countershaft. I figure I will need bearings as well. Any input would be greatly appreciated.

 

[dpuckett]

Popping out of gear is related to your detent springs and balls in your synchro assembly(s).



From the pics, everything looks normal. Some wear isnt bad, but since you are having problems, I'd put in a different 3-4 shift fork, along with a synchro ring for 3-4.



There is supposed to be a flat spot on the input shaft; it facilitates removal of the input and main shafts.



I'd replace the 5th gear.



Do you have a FSM, or the Getrag rebuild section? If not, get one. ALso do a search under mysteryman and 1stgen4evr, and you will find lots of information on Getrags.



Daniel

 

[1stgen4evr]

Also there were shims on the front bearing retainer. There were no shims on rear for the output or the countershaft.





Anyone ever seen shims on the front? I have not. The shims should be on the rear. The transmission will spit a gear when the main shaft isn't correctly loaded (shimmed). I have seen a problem with the detents but my first guess is that the preload was completely out.



Maybe you should consider a trip to SOP. There will be several there who are current on the Getrag.



The chip out of fifth probably happened earlier. (And might prove useable on careful inspection)



James

 

[WLehto]

Thanks Daniel and James for the information. Is wear on a shift fork related to the detent springs and balls? I do have the Getrag rebuild section, that is what kind of made me wonder about the shims being in the front. I'll have to look tonight in the case to see if there is the chip from the 5th gear and take a closer look at the gear.



Wayne

 

[CSteinke]

QUESTION??

Just got my getrag apart

any one have info on where to get parts? need 3/4th hub and sleeve, 2 berrings and lock dogs if i said that last part ok

CHET

 

[MMiller]

I've only had 3 apart now, and have NEVER found shims on the front. I wonder if this pushed the countershaft back far enough, that the shift fork for forth would not stay in gear? Have to think about that one some more.



I deal with Zumbrota Gear and Bearing in Minnesota(zbag.com). They have all the items that usually fail, new in stock, and they have a bunch of getrags for parts that don't break much. The one thing I have not found yet, is the large snap ring for the front countershaft bearing. I will admit, I've not done much research past Zumbrota.



Michael

 

[CSteinke]

Thanks Michal

Ya I need that snap ring also

 

[1stgen4evr]

pushed the countershaft back far enough, that the shift fork - - - -



Sounds comletely reasonable to me. At the very least, things are not in the designed position.





Is wear on a shift fork related to the detent springs and balls- - -



No. The purpose of the detent is to hold the rail and thus the fork in the correct designed positon. If you examine the fork to see which side the wear is on, I am thinking that you will find the clutch collar (that the fork fits into ) is being thrust out of (whatever) gear. If the detent is failing, you won't get much wear on the fork.



Be aware that if the gear has been jumping out over a long period of time, the mating teeth will have a taper which will cause the gear to still spit out, even with an otherwise correct rebuild. Examine the clutch teeth with strong magnification, inside the collar and on the gear



If you are in the deep south, Man-Tran in Tallahassee Fla has parts and Southern gear in Atlanta.



I have seen an input shaft made in India that didn't suit my preference. Stick with domestic parts if at all possible.



Look up Mysterymans post on the replacment shift yokes.



Buy a spare transmission if one comes up near you that is reasonable.





James

 

[mysteryman]

At times there will be shims in the front retainer,

Also there were shims on the front bearing retainer. There were no shims on rear for the output or the countershaft.





Anyone ever seen shims on the front? I have not. The shims should be on the rear. The transmission will spit a gear when the main shaft isn't correctly loaded (shimmed). I have seen a problem with the detents but my first guess is that the preload was completely out.



Maybe you should consider a trip to SOP. There will be several there who are current on the Getrag.



The chip out of fifth probably happened earlier. (And might prove useable on careful inspection)



James

 

[WLehto]

I was able to take the counter shaft out last night and found that it also was shimmed in the front. Seems like that would have shifted everything back to far.