First off I'm new here so howdy, seems like a lot of info here. Second, I was wondering if anyone knows what the preload is supposed to be on the input/mainshaft of the getrag? I just put in a new input and the one that came out was ate up bad I think they preloaded it to much and it burned it up. I have been using Mobil 1 about 4.5 quarts. Is there any other oil recomended? I should mention that my previous input shaft only lasted a year. I had gotten it from Standard Trans in Texas. I will try to get my truck specs on here soon.

 

You should check the shop manual, I remember something like .oo4 or .oo6 but don't hold me to it. I reshimmed mine when I did the countershaft bearings and it now has 274,000 on the originals. It would appear that Redline MTL does a pretty good job,eh? I really think it is the best for this application. Synthetic is good, but it is still a multigrade which will break down in a gearbox application. Hopefully someone with a manual will chime in and give you the proper specs. Good luck, Jim (Not affiliated with the above product except that it has proven itself to me!) ;D

 

Wish I could help ya out. If you do find out the specs and where to get a manual for the Getrag, let us know. The Dodge manual shows nothing.

 

I run 5 quarts in mine, which is a quart over normal level. This seems to be a big help in preventing early Getrag death. My owner's manual calls for 5W30 synthetic, and I use Mobil 1. This is a daily driver and it tows fairly heavy on weekends. Getting close to 150K, and the trans is doing fine. 8)

 

Thanks for the replies. Help me understand, you are saying that a muli weight oil will break down sooner than a say 30 weight for example. What weight is that redline your running? Is it synthetic? Is it somthing I have to order or can I find a dealer or somthing? One more question is it real expensive?<br> Somthing I've been thinking about is if a guy runs 5 quarts instead of 4 or 3.5 whatever came in it, it seams that maybee a person could step up in the weight of the oil. What do you all think. ???

 

From what I have read, A multigrade oil will break down to it's original oil stock- say a 5-30 will break down to a straight 5 weight when it is used in a gearbox- something to do with long chain molecules and shear strength, I'm no physics person though. It just made sense. The redline is a straight weight synthetic, very thin but with a 90 weight rating. It is designed for transmissions. I hope this isn't starting to sound like an ad-I'm sorry if it is. You can get it at a place like Summit Racing and such. I wouldnt go thicker on the oil- it's a pure splash and squeeze oiling system and the oil holes in the gears a VERY small. E-mail me if you would like, I don't want to get into hot water for advertising!!! Jim ;D

 

The multigrade oils will not break down sooner if the tranny temperature is kept below 300°F. Which I think isn't an issue.<br>Also the Getrag transmission was designed for 5w-30 or equivalent viscosity oil for proper lubrication of the upper components. There was a study done on the TDR about 3 years ago and they tested the G-360, NV4500 trannies with different oils and had results on the proper lubricant for each application.<br><br>Do use 5W-30 Dyno or Synthetic is up to you. If you want to research different oil viscosities to match a different oil, then thats fine, but this is the recommended oil for the Getrag. <br><br>I had a Getrag in my 89 with 250,000 miles on it without a peep, leak or other indication that I had any problems with it and ran 5W-30 all its life.. But the extra 1/2 quart in the tranny definitely saves the input bearing, no question.<br><br>J-eh

 

All I can add is that I've talked with lots of folks about this subject in the interest of making sure my Getrag lasts. Nearly everyone who's had their Getrag last lots of miles uses 5W30 synthetic with regular changes, and overfilled. Personally, I would not try a heavier oil. Lil Dog's '89 says it all.

 

My book shows mainshaft preload as .006-.008. You say you have been running redline 90 wt trans lube for over 200 K and it still works good? Do you run empty all the time or tow? Lastly does your trans run quiet with the 90wt? One last thing the 93 factory Dodge manual I have has the getrag overhaul info in it.

 

I am still ticked off that I bought a '92 manual instead of a '93 . . . <br><br>Regardless, do you mean 6-8 thousandths end play or pre-load?<br><br>End play would make sense. Pre-load I would find kinda strange.<br><br>Thanks,<br><br>Alec

 

Preload, no endplay on the main or countershaft. By the way the countershaft has the same preload....Looked up the redline MTL, its rated as a 70-80 gear lube and a 5-30, 10-30 as a motor oil weight so it should be good in the getrag. I wonder though if a 5-30 motor oil would have a gear lube weight rating. At any rate I shook a bottle of mtl and it sounds like a 5-30.

 

When I took my tranny apart about 2 weeks ago now it had been in the truck 1 year to the month and it was growling and getting hard to shift. I was not happy. I decided that since I had paid these so called &quot;profesionals&quot; and it lasted no longer than that, that I was going in my self. The only thing I could find wrong was the pocket bearing in the input shaft was REALLY bad. Either the input shaft was the wrong temper, it came from India, or they preloaded it to much. By the way I got that shaft from Standard Trans and Gear in Texas. This last one came from Italy. We will see what happens. I really like this truck it runs and drives great the power so smooth, just wish........ Thanks for all the replies. The more we learn the better. Scott

 

Pre-load is correct!! I was used to VW transaxle stuff and that seemed kind of foreign? to me, but it worked. I stood it on end to push everything tight and measured with a depth micrometer. The Redline is rated as an equivelent to 5-30, 10-30 and such but supposedly has a gear oil rating of GL-4 90 weight I believe. All I know is it seems to work for me. I usually only tow our trailer (5500lbs) up and down the Oregon coast once a year. I wish they had put the magnet in the tranny somewhere where you could get to it to clean it once in a while. German engineering, I suppose~ Jim

 

I had another thought, when I was in my trans, I noticed and Im sure most of you have too, that the imput shaft has a slot cut in it for oiling. If there was a way to put a oil pump and filter, then return the oil right on top of the input shaft in line with that oiling slot.... Just thinking out loud I guess. 8)