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Old 07-08-2011, 09:21 AM
trab trab is offline
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Default Transmission Acting Funny

Hey guys i have had the truck about 4 months now and it has been doing this since i have owned it. The truck does this at random it seems. Doesnt matter if its cold or has been driven a while, but when i pull up to a light sometimes i can feel the transmission switch gears while im at a dead stop. Then when i go to take off the truck has no power what so ever. Its almost like taking off from a light in 3rd gear. I have to almost floor the truck just to get up to speed. Once up to speed the truck seems to drive and switch gears just fine. Then at the next light it may or may not do this. It also has cut off after starting it up and putting it in drive, then i would put it back in park and it would start fine and i would have to throw it in drive and take off quickly before it would die again. Then it woudl be fine for the rest of the day. It has done this probably 4 times since ive owned it. Why would it be doing this? Thanks

Last edited by trab; 07-08-2011 at 09:27 AM.
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Old 07-08-2011, 02:27 PM
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Originally Posted by trab View Post
Hey guys i have had the truck about 4 months now and it has been doing this since i have owned it. The truck does this at random it seems. Doesnt matter if its cold or has been driven a while, but when i pull up to a light sometimes i can feel the transmission switch gears while im at a dead stop. Then when i go to take off the truck has no power what so ever. Its almost like taking off from a light in 3rd gear. I have to almost floor the truck just to get up to speed. Once up to speed the truck seems to drive and switch gears just fine. Then at the next light it may or may not do this. It also has cut off after starting it up and putting it in drive, then i would put it back in park and it would start fine and i would have to throw it in drive and take off quickly before it would die again. Then it woudl be fine for the rest of the day. It has done this probably 4 times since ive owned it. Why would it be doing this? Thanks
I would have the bands adjusted and check the fluid it might be low or burnt or outlived it's life. Take a paper towel and allow a drop of the ATF to fall on it, if the ATF spreads out on the paper the fluid is still good if it doesn't then it's outlived it's contract.
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Old 07-08-2011, 04:37 PM
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Agreed with the above, also maybe a sensor or ecu issue for the trans?
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Old 07-08-2011, 05:12 PM
trab trab is offline
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I tried to put in some lucas non slip. And it did absolutly nothing. So maybe this weekend ill change the fluid and filter.
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Old 07-08-2011, 08:43 PM
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I tried to put in some lucas non slip. And it did absolutly nothing. So maybe this weekend ill change the fluid and filter.
Their are really only two things that will make a transmission slip. Either your transmission is low on fluid or the bands are in need of adjustment. Sure it can be the friction material has worn away, or the band needs to be replaced but 9 times out of 10 when it comes to slipping it's one of those two. Now note the forward drum/band is for first gear only, the reverse drum/band is for 2nd and 3rd gear along with reverse. Just some general information on the drum system...

Your best bet is just to do a regular service on it, most likely it hasn't had service done in a long time, many people don't even service the transmission. Anyways start out with a band adjustment so you can drive it then have the fluid flushed threw an exchanger. Then you should be good to go. Now if the fluid is burnt their is the possibility the clutch packs have died, clutch pack being friction and steel plates.

Not saying you did kill the friction material but burnt fluid is only caused by a few things and like said it's limited.
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Old 07-12-2011, 01:01 AM
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Default Transmission

I just changed out my transmission fluid and filter. I saw a small amount of fine metalic powder mixed in with the fluid. Is this a bad sign or normal. I've had problems with the transmission lately. It has gone into limp home mode, Im going to schedule another fluid change because I need the bands adjusted. I started to do it myself but it seem a tad bit out of my scope of practice. any help would be appreciated
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Old 07-12-2011, 11:41 AM
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Originally Posted by JonEstey View Post
I just changed out my transmission fluid and filter. I saw a small amount of fine metalic powder mixed in with the fluid. Is this a bad sign or normal. I've had problems with the transmission lately. It has gone into limp home mode, Im going to schedule another fluid change because I need the bands adjusted. I started to do it myself but it seem a tad bit out of my scope of practice. any help would be appreciated
Fine ground metal powder is perfectly normal, if their were non I would be worried lol... Anyways the only time you want to be worried about metal shavings is when they are shavings and not powder form. Their should be a magnet inside the bottom of the fluid pan, this collects the shavings to prevent them from circulating the transmission, clean the magnet at every fluid change.

As far as a band adjustment if you're not confident with doing it yourself which I can understand best to leave it to someone who has done it before and can afford mistakes lol
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Old 07-12-2011, 12:38 PM
JonEstey JonEstey is offline
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Default Transmission continued

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Fine ground metal powder is perfectly normal, if their were non I would be worried lol... Anyways the only time you want to be worried about metal shavings is when they are shavings and not powder form. Their should be a magnet inside the bottom of the fluid pan, this collects the shavings to prevent them from circulating the transmission, clean the magnet at every fluid change.

As far as a band adjustment if you're not confident with doing it yourself which I can understand best to leave it to someone who has done it before and can afford mistakes lol
I agree on the bands. I like my truck and I may be her greatest enemy if I go around trying to adjust them. Would you have any idea you she would go into "limp home mode". The fluid wasnt burnt, no shavings. She has gone dead on me quite a few times do to a nasty short somewhere in my system. I figured the power drain my have affected on of the solenoids like the TCC. I do have the notorious P0740 code come up, "Transmission Cluch Circut Solenoid malfuction" how ever I know that could be to many things to list. Any ideas. Oh yhea thnks for the last bit of information. Very helpful.
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Old 07-12-2011, 11:00 PM
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Originally Posted by JonEstey View Post
I agree on the bands. I like my truck and I may be her greatest enemy if I go around trying to adjust them. Would you have any idea you she would go into "limp home mode". The fluid wasnt burnt, no shavings. She has gone dead on me quite a few times do to a nasty short somewhere in my system. I figured the power drain my have affected on of the solenoids like the TCC. I do have the notorious P0740 code come up, "Transmission Cluch Circut Solenoid malfuction" how ever I know that could be to many things to list. Any ideas. Oh yhea thnks for the last bit of information. Very helpful.
Well you know it goes into limp home mode when it stays in 1st gear only but I always say if the worst came you can always drive backwards!
Anyways usually the transmission goes into limp home mode when the reverse drum is shot or the reverse band is shot. Remember the reverse band is for 2nd and 3rd gear so you can't go into 2nd then you stay in first which is limp home mode.

Just so you know under the steering wheel is a blue connector that is for a DRB tool that communicates directly with the transmission. The S.B.E.C communicates with the transmission as well. That blue connector is also for the Air Bag control so you can run tests and update the program on it.

Now back to the tranny, just some good stuff you can if you rebuild the transmission in the future you could update the drums with extra friction and steels so you could take a 46RH and upgrade it to be similar to that of the 48 series. Basically it would have a little more power and torque a bit stronger. Oh also very good information with the 46 series transmissions the cooler line fittings and the bell housing are tappered threads so DO NOT OVERTIGHTEN the fittings else wise you will do what I did and thats make a hairline crack in the transmission and then have to hunt down a A518 case which can be hard but they're out there. But what you can do is buy a Tap that is NPS straight thread and just re-tap the threads and replace the stock fittings with high performance straight thread fittings as well which is what I'm going to do when I put a new case on the transmission.

Their are a few things about the 46 I find annoying but all in all it's a great tranny, mines leaking fluid could use a band adjustment soon but it moves and I drove it like 300+ miles in the past couple days and it hasn't driven more than 1 mile in 6 years so it's a decent transmission.

Also pay some attention to the differential regular fluid change if you tow else wise every 50K miles is perfect. The transmission though is very important as long as you do a periodic fluid flush and use good quality ATF+4 and change the filter normally then the transmission will last forever almost. But like I said the bands wear overtime and would require replacement at one point in the lifespan of the vehicle, tragic but life...

I think I sent you that service manual for the 46, if not just PM me your email and I'll be sure to get it out to you.
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Old 07-14-2011, 10:46 AM
trab trab is offline
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I tried to adjust my bands somewhat this past weekend. I just tried the front because i wanted to see if i could do that one before i change my fluid and did the adjustment in there. Anyways, i loosened the locking nut and backed it off about 5 turns. Then put in my torx and started trying to screw it in until it stopped on the 72in lbs like the instructions say. And the adjustment screw never stops going in it seems. Should i have just kept screwing or what am i doing wrong? I just backed it out until it was where i thought it was when i started. Trucks driving fine, but i wanted to get this perfect before i try to do the one inside the trans pan. Thanks
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