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Old Feb 1, 2009 | 08:09 AM
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I was just wondering what are the differences in the 3 transmissions in the title?(4L60E,TH350,&TH400) i am needing to know to prove a point to my dad that the transmission in my 94 Chevrolet C1500 pickup is a 4L60E and not a 350 transmission. see my transmission has been acting funny but i think its because when i pulled the engine to rebuild it, it took so long to get it back in there that the transmission might've gotten some trash in it and just needs to be drained & have a new screen put in it. anyways he says that the cable from the tranny to the steering column needs to be fixed but i told him that the 4L60E doesnt have a cable because it is Electronic, thats what the E stands for. and he thinks whats in the truck is a 350 transmission. just to let ya know, after i got the truck back running, when i put it in a gear(P,R,N,D,3,2,1) sometimes it will just sit there for 30 seconds sometimes lol and then in first gear it feels like it slips sometimes, & it has just quit pulling for 2 or 3 seconds going about 40 then went back like normal. anyways there it is.
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Old Feb 1, 2009 | 10:16 AM
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Originally Posted by Coonass350
I was just wondering what are the differences in the 3 transmissions in the title?(4L60E,TH350,&TH400) i am needing to know to prove a point to my dad that the transmission in my 94 Chevrolet C1500 pickup is a 4L60E and not a 350 transmission. see my transmission has been acting funny but i think its because when i pulled the engine to rebuild it, it took so long to get it back in there that the transmission might've gotten some trash in it and just needs to be drained & have a new screen put in it. anyways he says that the cable from the tranny to the steering column needs to be fixed but i told him that the 4L60E doesnt have a cable because it is Electronic, thats what the E stands for. and he thinks whats in the truck is a 350 transmission. just to let ya know, after i got the truck back running, when i put it in a gear(P,R,N,D,3,2,1) sometimes it will just sit there for 30 seconds sometimes lol and then in first gear it feels like it slips sometimes, & it has just quit pulling for 2 or 3 seconds going about 40 then went back like normal. anyways there it is.
4L60E will have a round electrical connector coming out of the right side just behind the servo cover. If it is a t350 or it will have a vacuum mod on the back and a 400 has a vacuum mod on the right front side.

Sounds like you should check the oil level first.
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Old Feb 1, 2009 | 10:23 AM
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in 93 chev changed to a 4l60e in the trucks-your father is somewhat correct, there is linkage from the col to the trans, thats what changes gears in the trans-way back when they used 350's, they had a kickdown cable from the trans to the carb-then when they switched to 700r4's, they used a TV cable, which if not adj right, would cause problems
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Old Feb 1, 2009 | 11:19 AM
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Sorry for the stupid question but did you check the trans fluid level?
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Old Feb 1, 2009 | 11:23 AM
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Sorry for the stupid question but did you check the trans fluid level?
yeah i checked it and its fine.

in 93 chev changed to a 4l60e in the trucks-your father is somewhat correct, there is linkage from the col to the trans, thats what changes gears in the trans-way back when they used 350's, they had a kickdown cable from the trans to the carb-then when they switched to 700r4's, they used a TV cable, which if not adj right, would cause problems
yeah but he said that i couldnt pull the engine outta the truck without unattaching the cable from the transmission. he is wrong, i pulled the engine without having to unattach anything from the transmission going to the engine. i know there is a cable going from the column to the trans otherwise it couldnt go into gear right? but he said that i wouldve had to detach a cable going from the trans to the engine and i know for a fact i didnt have to.
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Old Feb 1, 2009 | 11:50 AM
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You have a 4l60e the 400 and 350 are three speed autos If you had one of those your shifter would say prnd21 , But it sounds like you are gonna need a trans
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Old Feb 1, 2009 | 02:04 PM
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oh okay. and does it really? you dont think a cleaning would help it any? i mean it wasnt like that before the engine messed up. it set up for about half a year you dont think it just got dirt n debree in it?
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Old Feb 1, 2009 | 03:30 PM
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not likely on the dirt and debris however a high milage trans setting up for a year is not a good thing seals dry out and harden etc
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Old Feb 1, 2009 | 03:40 PM
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oh okay. so you think it is going to go out eventually? i mean ill drive it until it does go out which i hope it last another year so i can get my trans am first lol
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Old Feb 1, 2009 | 04:00 PM
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When did the mods in your signature appear? Before or after the transmission problems?

Does the check engine light come on when driving? Does the light test at start up?
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Old Feb 1, 2009 | 05:29 PM
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the mods were there before the transmission problems. actually i had a bigger cam before the engine messed up so when i went back with the engine i went with a little smaller one for gas mileage
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Old Feb 2, 2009 | 08:20 AM
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will the tranny eventually give out?
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Old Feb 2, 2009 | 11:31 AM
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They all evenutually fail. When depends on the it current condition and how hard you drive it.
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Old Feb 2, 2009 | 09:29 PM
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alright, well i dont drive it hard much, only when i get on the interstate i have to punch give it some gas to get out in front of traffic but thats only once a week lol. its the stock tranny with 129,800 miles on it and never been rebuilt or anything, do you think changing the fluid and the screen or filter will help it a little?
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Old Feb 2, 2009 | 09:46 PM
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Originally Posted by Coonass350
alright, well i dont drive it hard much, only when i get on the interstate i have to punch give it some gas to get out in front of traffic but thats only once a week lol. its the stock tranny with 129,800 miles on it and never been rebuilt or anything, do you think changing the fluid and the screen or filter will help it a little?
I don't know that you need to totally baby your transmission. Changing fluid without knowing the history of the transmission is not a good idea. If it has never been changed, you will have problems.
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Old Feb 2, 2009 | 09:51 PM
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Originally Posted by tptransmission
I don't know that you need to totally baby your transmission. Changing fluid without knowing the history of the transmission is not a good idea. If it has never been changed, you will have problems.
Just wondering why it is a bad Idea to change your trans fluid. I would think it is a good thing to put new fluid in especially if you don't know when it has been done last.
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Old Feb 2, 2009 | 10:02 PM
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Just wondering why it is a bad Idea to change your trans fluid. I would think it is a good thing to put new fluid in especially if you don't know when it has been done last.
yeah i was just wondering the same thing. i thought it was a good thing to change the fluid...
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Old Feb 2, 2009 | 10:11 PM
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it is because the fresh fluid could knock loose any crap in the trans therefore making it fail...
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Old Feb 2, 2009 | 10:12 PM
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Transmission fluid additives break down over time. When this happens the internal components get a tarnish on them and the frictional characteristics are changed in such a manner that this poor gritty fluid helps with the transmission functionality. When you add new oil it does not blend with the old oil the additives.
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Old Feb 2, 2009 | 10:14 PM
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Originally Posted by CamaroRacing12
it is because the fresh fluid could knock loose any crap in the trans therefore making it fail...
damn, no ****? thats crazy, i always thought that it was good to change the fluid. and say i got a new tranny, how often do you change the fluid?
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