1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

5 speed

Old Sep 13, 2009 | 12:56 AM
  #1  
lodal cummins's Avatar
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are the gertag trannys a piece of crap? will they not hold up to many mods? my 92 has 174,000 on it and i don't want to grenade it as my wage does not support the repairs at this moment.
 
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Old Sep 13, 2009 | 03:23 AM
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the trannys were one of the best out there.the only problem with them was fifth gear nut falling off so u would lose fifth but that was it.ive had 2 of that model trannys and they held up great with a bunch of mods.so my opinion would be yes they are good trannys.
 
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Old Sep 13, 2009 | 06:32 PM
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There are guys out there pushing over 500hp and close to or over 1k tq through a getrag with no issues. The big thing is overfill it by one qt of fluid next time you change it. If I'm not mistaken the ones with the 5th gear nut problem is the nv4500 not the getrag.
 
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Old Sep 13, 2009 | 06:45 PM
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i changed mine about 25,000 ago and just filled it till i was running out the fill plug. so question is how to overfill it?
 
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Old Sep 13, 2009 | 06:45 PM
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Originally Posted by aaronmoore
the trannys were one of the best out there.the only problem with them was fifth gear nut falling off so u would lose fifth but that was it.ive had 2 of that model trannys and they held up great with a bunch of mods.so my opinion would be yes they are good trannys.
You are thinking of teh NV4500's. The Getrags dont have the 5th gear nut problem.

The getregs are AWESOME trannys. They get a bad rap for a couple reasons.

1. They run low on fluid. After 20 or so years.... you need to change teh fluid... also over filling by a quart helps ALOT!!!

2. Dont lug it. This is also what kills the 5th gear nut in teh 4500's
 
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Old Sep 13, 2009 | 06:46 PM
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Originally Posted by Free89W350
There are guys out there pushing over 500hp and close to or over 1k tq through a getrag with no issues. The big thing is overfill it by one qt of fluid next time you change it. If I'm not mistaken the ones with the 5th gear nut problem is the nv4500 not the getrag.
KTA is running 650hp through his stock rag...
 
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Old Sep 13, 2009 | 06:47 PM
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Originally Posted by lodal cummins
i changed mine about 25,000 ago and just filled it till i was running out the fill plug. so question is how to overfill it?
You can either ad an extension tube. Or CAREFULLY jack up teh side that the fill plug is on and add the extra quart.

You might also be able to fill it through the hole for teh shifter but I'm not sure.
 
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Old Sep 13, 2009 | 07:32 PM
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I overfill mine through the top PTO plate bolt.
 
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Old Sep 13, 2009 | 08:59 PM
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Originally Posted by aaronmoore
...the only problem with them was fifth gear nut falling off so u would lose fifth ...
That's an NV4500 problem. Never head about anything like that from a G360. Another common issue is running the wrong oil. Overfilling helps with getting a lighter (motor/ATF/Synchromesh) oil into the bearings. Gear oil at the stock level almost guarantees faiure in short order.
 

Last edited by NadirPoint; Sep 13, 2009 at 09:02 PM.
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Old Sep 13, 2009 | 09:57 PM
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how hard is it to convert an automatic, to a manual, and i want to use a getrag manual.
 
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