athawk11
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Posts: 298
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Dana 18
Jan 3, 2018 21:53:17 GMT -5
Post by athawk11 on Jan 3, 2018 21:53:17 GMT -5
Hello Gentlemen,
I recently acquired a Dana 18 TC for a good price. $40.00 plus shipping. It's a small bore ( 3-5/32" ) with a 1-1/4" intermediate shaft. The gears all look good. The intermediate gear and shaft look new. The bore is clean and smooth. The bearings and races are in okay shape, but I intend on replacing them.
I've always been disappointed with how noisy my TC is in my green 3A, even after replacing the intermediate shaft. I'm hoping to fix this up and swap it in. I'm not as familiar with these later TCs so I thought I'd ask the Team a few questions...
-It doesn't have the front or rear bearing caps. Are these interchangeable between the 1-1/8" and 1-1/4" cases?
-I've checked the numbers on all the gears and believe I'll need the 29 tooth main drive gear. Is this correct?
-The different tooth counts on these gears makes me nervous to bolt it to my drive train. Will it work? Am I missing something?
-Finally, if you had this option, would you make this change?
Any input is appreciated.
Tim
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Deleted
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Dana 18
Jan 3, 2018 23:28:22 GMT -5
Post by Deleted on Jan 3, 2018 23:28:22 GMT -5
I do not believe there are any differences in the front or rear caps, I have a nice 29 tooth input gear I can send you as well. I believe after 1954-55 all were 29T, the change (if my memory is correct) was to allow more gear surface area for larger hp engines and gear noise.
Lee
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oilleaker1
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Post by oilleaker1 on Jan 4, 2018 7:36:54 GMT -5
I'm running that very T case in my CJ2A and I put the terraflex gear set in it. It makes the same magnitude of noise the other case did. I believe they all do until you go to a Dana 20 T case. It will bolt in no problem. The larger intermediate shaft was I believe a effort to solve a wear problem and beef it up. It did little to quiet them down. If the intermediate gear is a loose fit on the thrusts, they are even noisier. This may be why your 1 1/8 t case seems noisy. Oilly
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Dana 18
Jan 4, 2018 12:14:38 GMT -5
Post by binthere on Jan 4, 2018 12:14:38 GMT -5
If I remember right, Advance adapters have a tapered bearing kit for the main shaft to get rid of those roller bearings. I had that system installed on the 55 CJ5 I built and my son put the tapered bearings in the t-case on my 3B. It helps some with the noise, but gets rid of those roller bearings and the wear you get on the main shaft. It seems the more wear on the main shaft, the more noise you get. If you interested I can find the information on it. I believe you have to have some machining done on the case, but seems wasn't that expensive. I like it.  |
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athawk11
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Posts: 298
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Dana 18
Jan 4, 2018 12:32:22 GMT -5
Post by athawk11 on Jan 4, 2018 12:32:22 GMT -5
Thanks for the input everyone. Lee...Still haven't made it over to Fred's. And you still haven't thrown me a price. I am interested in the 29 tooth gear. Perhaps we can bundle the price with all the other stuff you sent. When I replaced the shaft and small parts kits (Novak) in the current 1-1/8" case, the old thrust washers were chewed up...and the cage bearings had come slightly 'uncaged'. Thought for sure I would get a quieter box for my efforts, but didn't. I did have some pretty deep wear marks on the case surface where the thrust washers ride...as if a prior owner let a rebuild go too long past the 'Sell By' date, but the new thrust washers covered this damage, so I went with it. ( I really didn't have a choice. ) This all started because Rachel's 3A (Whitey) is very quiet when compared to mine. I'm sorry to say I'm a bit jealous. Internally, this new 1-1/4" case looks good. There are still light machine marks on the face that the thrust washers sit on. These are photos from a few years back when I swapped the intermediate shaft. I didn't get a picture of the damage inside the case. I wiped the inner bore of the intermediate gear clean, but I don't remember if it looked good or bad.   |
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Dana 18
Jan 4, 2018 15:27:43 GMT -5
Post by brucew on Jan 4, 2018 15:27:43 GMT -5
Tim, count the teeth on the high-range out put gear (the one that spins freely on the output shaft - No. 52 on page 175 in your Service Manual). I think it should have the same tooth count as the transmission output gear. It has to, for the high-range ratio to be 1:1, but I've never checked on this.  B-dubya |
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athawk11
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Posts: 298
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Dana 18
Jan 5, 2018 13:02:14 GMT -5
Post by athawk11 on Jan 5, 2018 13:02:14 GMT -5
Thanks Bruce. I'll count some teeth this weekend.
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athawk11
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Dana 18
Jan 12, 2018 22:58:03 GMT -5
Post by athawk11 on Jan 12, 2018 22:58:03 GMT -5
The high range output gear does have 29 teeth. Thanks Bruce.
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B-dubya