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. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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
  9. 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
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