Leakin Dana 300 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-22-2001, 05:32 PM
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Leakin Dana 300

I finally got around to checking the fluid in my 1980 CJ-7 Dana 300 transfer case. To say it was low was an understatement. I had to put in about 1 1/2 quarts of gear oil to fill it up. After getting it filled I was able to shift it into all 3 positions, which I could not do previously.

The next morning , however I found out why it was so low. I had about a half a quart of gear oil on my driveway under my jeep. It seems to be leaking from the front output shaft seal and possibly from the gasket. Do I need to pull the case to replace the seal? the gasket? Could it be anything else?

Thanks in advance

Tom

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post #2 of (permalink) Old 01-22-2001, 07:07 PM
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Re: Leakin Dana 300

That seal will be very difficult to replace without pulling the case. The housing for the front output shaft also retains the shift rails, and they can be a real PITA to put back in the bearing retainer due to the little shift detent balls and springs. It is no big deal to pull that case, you can have it out in under and hour, all you need to do is unhook the driveshafts, disconnect the shifter, unplug the 4wd light and remove it. Of course, you need to remove the skid plate and support the engine with a jack. When you do replace that seal you may as well replace the 2 shift rail seals also. Almost forgot, don't forget the t-case input shaft seal that is in the back of the tranny. You should always use a new one, just pop it out with a screwdriver and put a new one in.

Brad
ORC Land Use Section Editor
http://www.off-road.com/land
Vice-Pres. Rock Garden 4 Wheelers, Farmington, NM
post #3 of (permalink) Old 01-22-2001, 07:20 PM
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Re: Leakin Dana 300

You will find that particular seal very difficult to deal with without pulling the case, see for yourself if you so choose. The case is so darn easy to pull, it will make your life a lot easier in the long run.

Brad
ORC Land Use Section Editor
http://www.off-road.com/land
Vice-Pres. Rock Garden 4 Wheelers, Farmington, NM
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