IMP
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Posts: 324
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Post by IMP on Aug 24, 2011 18:16:07 GMT -5
tips/tricks/questions....
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Post by derbydude on Oct 3, 2011 8:29:13 GMT -5
904 behind a /6, lost rear brakes, then lost reverse in the transmission, also had looped lines for this particular derby. found out later the transmission was leaking fluid due to the back of the yoke being knocked out. Should I a) buy a manual and rebuild kit and attack this thing b) get a total overhaul kit c) try to find another /6 transmission nearby for cheap, d) probably spend too much money and send it to a professional
This is not my main set up, but would like to get it going as a runnable drivetrain. /6 ran like a champ with and without water.
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Oct 3, 2011 10:41:58 GMT -5
they're easy to rebuild, I suggest option A. I get my rebuild kits from Transstar and they are right around $100
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Post by Krueggs81 on Oct 3, 2011 16:55:58 GMT -5
Anyone got any advice on the 904 tranny I have one I will be rebuilding in school! What kit do you get? Do you do a shift kit? etc...
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Post by derbydude on Oct 3, 2011 17:27:01 GMT -5
they're easy to rebuild, I suggest option A. I get my rebuild kits from Transstar and they are right around $100 can you refer me to a good manual also?
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dm440c
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Post by dm440c on Oct 4, 2011 10:50:59 GMT -5
hmmm, I'm a little out of touch on what is a good manual for the beginner. Factory service manuals have good detail, the ATSG manuals are a decent outline and very cheap at about ten bucks but probably a bit shy on detail for a novice. It's difficult for me to gage your comfort level.
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Post by derbydude on Oct 4, 2011 18:03:50 GMT -5
not finding many other resources besides the atsg manual, looks like thats what i'm goin with, any special tools needed?
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Oct 5, 2011 11:21:13 GMT -5
you'll probably need a slide hammer to get the pump out. You'll need a quality set of snap ring pliers, you can do it with cheapies but it can be frustrating. To get the clutch pistons apart and change the seals you'll need a special tool and/or a shop press, you can buy one or make your own tool or just skip this step. I frequently opt to skip this step out of laziness ;D the main thing is to replace the clutches and bands
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Post by long527 on Oct 8, 2011 12:50:02 GMT -5
What is the best transmission a 904 or a 727?
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Oct 10, 2011 10:32:24 GMT -5
same basic design although 727 has bigger parts. Either works fine for me
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Post by Scott#4 on Oct 11, 2011 9:13:14 GMT -5
Anyone have a place to get accurate specifications for torquing the transmission bands? I see a lot of diffrent specs out there. I have a 904 out of a 68.
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dm440c
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Post by dm440c on Oct 12, 2011 10:33:57 GMT -5
the basic recipe says to tighten to 72 lb-in and then back off two turns, now in various publications I've seen everything from 2 to 4 turns for the 900 series transmissions rear band although the front band always seems to be 2 turns. I do it by feel but maybe if you aren't comfortable with that you could split the difference and go with 3 turns...? I would expect that to be close enough.
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Post by 717wreckingball on Oct 12, 2011 17:52:48 GMT -5
do you have to drop the valve body to be able to change the shift shaft seal?
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Post by Scott#4 on Oct 13, 2011 7:55:43 GMT -5
No, you do not have to pull the valve body. Just use some kind of pick to pull it out from the top.
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dm440c
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derby drivers against drama- there's no crying in demo derby!
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Post by dm440c on Oct 13, 2011 11:00:10 GMT -5
yep. In a derby car I'd suggest just cutting away some of the floor to make it easier to get to from the top. Out of the car it's a no brainer. In a driver car they make a special tool that works slick to change them out without damaging anything.
Basically you just remove the kickdown lever and the shift lever, then it can be pried out. The new one can be installed by tapping lightly on a deep socket of the appropriate diameter until it is seated.
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