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Old 03-12-2012, 09:47 AM   #1 (permalink)
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93 Cummins w/ Getrag 5 speed question

Have 93 with around 1/4 million miles. Understand that Getrag transmission can have issues. Have 3 quick questions.

1. Was told that overfilling transmission was a good idea. Was also told to use 5 quarts. Is that correct?
2. If so how do I add the additional 2 quarts into the tranny?
3. Any advantage to using Synthetic oil? I use it in my Jeep 4.0L engine but I noticed a tendency to leak more oil around the oil pan plug after switching to synthetic. Will the synthetic lead to more leakage?

Thanks.

Ed on Bass
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Old 03-12-2012, 10:13 AM   #2 (permalink)
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No 1 correct
No 2 top PTO cover bolt hole is where it gets filled to, use the regular fill plug until it gets full and then use the bolt hole to put last quart or so in.
No 3 Use 5W30 synthetic yes it may leak a little but add some every once in a while is cheaper than rebuilding trans.

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Old 03-12-2012, 10:50 AM   #3 (permalink)
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93 Cummins w/ Getrag 5 speed question

Just for clarification, my truck is a 2 wheel drive. Does that change how to overfill the transmission?
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Old 03-12-2012, 10:56 AM   #4 (permalink)
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Same, no matter if 2 or 4 wd.
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Old 03-14-2012, 09:20 AM   #5 (permalink)
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Follow up questions

Thanks 9297oldram,

Couple more quick questions. As I remember the original book for the Dodge calls for 10w30 oil. Why the recommendation of 5w30? Where I come from a PTO is a power take off usually associated with a tractor. I am not sure what the PTO bolt is in this case. Please clarify so that I remove the correct bolt.

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Old 03-14-2012, 10:18 AM   #6 (permalink)
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Talking about the PTO cover that is on the side of the trans, passenger side. If you use the google box top left and search Getrag transmission fluid you'll find out everyone uses 5w30 synthetic. I've never looked in my FSM to verify if that's what it says.
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Old 03-15-2012, 10:46 PM   #7 (permalink)
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Thought I would chime in on this. 9297 is correct on everything he has said. And if you follow his advice you will get many miles of trouble free service from your getrag. But... I may be one of the few who don't use 5w30 in my Getrag... After I rebuilt it I went with Mobil 50w synthetic gear lube. Same stuff as what large truck/semi transmissions use. Had it in for about 50k now and trans is still working perfectly. This fluid may not be for everybody, but I pull a gn quite a bit with it and wanted something that might tolerate that better. Just my 2 cents.
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Old 03-15-2012, 11:47 PM   #8 (permalink)
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I just added 4 quarts of 5w30 earlier today and found it gear oil in it before. What a difference in the shifting.
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Old 03-16-2012, 02:31 AM   #9 (permalink)
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The main thing is to over fill it to keep the top bearing oiled good.
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Old 03-16-2012, 02:41 AM   #10 (permalink)
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Quote:
Originally Posted by 9297oldram View Post
The main thing is to over fill it to keep the top bearing oiled good.
Yeah exactly. Mine was hard to shift when cold though n I think I found out why.
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Old 03-16-2012, 02:44 AM   #11 (permalink)
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Cold thick gearoil does that.
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92 D250 custom made bed, 190 inj., 16cm , electric cooling fan, 2nd gen air horn, 5spd., Dana 61 3.31 gears, 1 stage W/M set up

97 2500 4X4 auto DDP 40 HP injectors, no 8 fuel plate, homemade 3" intake horn, BD converter, BHAF, electric cooling fan
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Old 03-16-2012, 03:04 AM   #12 (permalink)
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Oh I know the stupid thing is the PO's runs his dads garage here in town but never bothered to try a lighter oil.
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