transmission

An automatic transmission (sometimes abbreviated AT) is a multi-speed transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. Vehicles with internal combustion engines, unlike electric vehicles, require the engine to operate in a narrow range of rates of rotation, requiring a gearbox, operated manually or automatically, to drive the wheels over a wide range of speeds.
The most common type of automatic transmission is the hydraulic automatic, which uses a planetary (epicyclic) gearset, hydraulic controls, and a torque converter. Other types of automatic transmissions include continuously variable transmissions (CVT), automated manual transmissions (AMT), and dual-clutch transmissions (DCT).
The 1904 Sturtevant "horseless carriage gearbox" is often considered to be the first true automatic transmission. The first mass-produced automatic transmission is the General Motors Hydramatic four-speed hydraulic automatic, which was introduced in 1939.
Automatic transmissions are also found in some heavy commercial vehicles, particularly those which are subject to intense stop/start operation such as buses and waste collection vehicles.

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  1. BMK84CJ572

    Build Thread 1972 CJ5 “re”build

    I recently bought my first CJ mostly as a deer lease vehicle. I’ve wanted one since I was a kid listening to stories my dad would tell about his (‘74 CJ5 with the 304 V8). I knew it would need work eventually; It is much older than I am after all, but I wasn’t expecting it would be so soon...
  2. R

    Trans Can anyone help me identify my transmission?

    Okay, this is what I know. On the transmission right above the oil pan is "K3240107X 6954 7113" there's a few other numbers printed on the transmission itself. I'll post those as well. But I believe this is one of the most relative numbers from what i'm googled. On the main body, there's "80...
    • rally76cj7
    • Thread
    • gasket identification numbers pattern transmission
    • Replies: 0
    • Forum: Drivetrain
  3. BMK84CJ572

    Clutch Advice on clutch/transmission issue

    Hi y'all! I recently purchase my first CJ and I love it! But I'm having an issue I would appreciate some help with. The Jeep is a '72 CJ5 with the 258, I believe a T-15 transmission, and Dana 20 t-case. I've been doing some research and reading the forums, but I'm still not sure where to...
    • BMK84CJ572
    • Thread
    • advice clutch noise shift transmission
    • Replies: 14
    • Forum: Drivetrain
  4. W

    Trans breather on T5

    Hi everybody, I'm here looking for some insight. I have an 86 CJ7, and after an engine rebuilt I am putting some things together. During the process I found that the transmission (t5) has a plugged breather hole with what looks like a sleeve. - picture attached I am assuming that this was a...
  5. B

    Trans Unable to remove Top Cover on T176

    Hi all, Currently. working on replacing top cover gasket and am unable to remove the cover. Lifting the cover up about 3/4" shows that the rear fork is not lined up with the slot in the case. The fork is forward of the slot preventing the cover from being removed. Based on this forum entry...
  6. J

    Trans My '85 CJ7 will not stay in 2H. It will run normally in 4L

    for the past couple of weeks, I have been trying to diagnose and seal a transmission fluid leak with my T176 transmission in my '85 CJ7. After a lot of checking and looking, I thought we had the leak fixed (at least greatly diminished). I jumped into the Jeep yesterday to go to the gym, and as...
    • jdg3cj85
    • Thread
    • cj7 diagnose fluid leak transmission
    • Replies: 2
    • Forum: Drivetrain
  7. D

    Trans 2nd gear synchro?

    I am concidering purchasing a mid 70’s CJ7. With a V-8 and a T-178 4 speed. The owner is telling me that he thinks the 2 nd gear synchro is starting to go . When it is going down a hill in 2nd It pops out of gear from time to time. Is this a major repair and /or a start to...
    • Dan07
    • Thread
    • cj7 gear hill pops transmission
    • Replies: 1
    • Forum: Drivetrain
  8. shooby

    Clutch Do I have a clutch problem?

    1978 CJ-5 with V8 and T18 Transmission. Hydraulic clutch. I see conflicting opinions on this but here goes: When I try to put it in 1st or Reverse, most often I have to grind the gears. Yes, I put it in 2nd gear first and that is absolutely necessary but I still have to jam it to get it in...
    • shooby
    • Thread
    • clutch gear grinding hydraulic transmission
    • Replies: 16
    • Forum: Drivetrain
  9. JeeperChris

    Trans Replacing T150 with T18 Trans

    From what I've read on the net it looks like a striaghtforward swap. Has anyone done it? What could go wrong at each end? -Input shaft could have different splines... I don't know how the transfer case hooks to the trans so I am only assuming that it's the same for both transmissions...
  10. T

    Trans Transmission - T150 Expert help, please

    I'm going to be a little long with my description, hopefully to help describe the problem. I have rebuilt my T150 3 speed a couple of times in the past. The problem that I can't seem to solve is this.... When running thru the gears, 1st gear is quiet, 2nd gear is quiet, 3 gear is very noisy...
    • Trever
    • Thread
    • gears noise rebuild transmission
    • Replies: 7
    • Forum: Drivetrain
  11. O

    Trans Transmission for my CJ7

    I have a 1979 CJ7 258L with the T150 transmission and the Dana 20 transfer case. The transfer case is shot, so I plan to replace it with a Dana 300. I'm also considering an automatic transmission. Looking for recommendations for the best auto to put into it and best practices/pitfalls. thanks
    • oldcj7guy
    • Thread
    • cj7 drivetrain recommendations transmission upgrade
    • Replies: 14
    • Forum: Drivetrain
  12. J

    Trans 4 speed trans identifying

    I have a CJ7. I think I have a T176 trans, given that the stick comes up at an angle and it’s a 4 speed with reverse down on the passenger side. It has a tag on the right side with the numbers 5359390 RHLK3 1142 Is this enough info to determine which trans I have? Thanks
    • Jond417
    • Thread
    • drivetrain identification manual stick shift transmission
    • Replies: 11
    • Forum: Drivetrain
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