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. J

    Trans T15 shifter frozen up

    the shifter on my T15 trans is frozen up after sitting for years, how do i un freeze it
    • jlrice59
    • Thread
    • gear maintenance mechanism shifter transmission
    • Replies: 3
    • Forum: Drivetrain
  2. C

    Trans Best Transmission for highway speed 304

    I'm a newby although I've had my 77 CJ7 w 304 and T-150 transmission for forty ! years. I'm driving 3 hours each way for hunting and deciding it is time to swap an automatic behind the 304 and not wind out the motor on the highway. What options are there for the 304 and mating with a Dana 20...
    • CJ7Fremont
    • Thread
    • 304 automatic drivetrain highway transmission
    • Replies: 5
    • Forum: Drivetrain
  3. Belizean

    Clutch Hydraulic Clutch and Slave Cylinder for Jeep CJ7 w/258/T176 transmission. What are you using ?

    Mine ( 1984 ) came with a AMC 150 4cyl. w/T4 and a hydraulic clutch with external slave on T4 that was as easy and smooth as a Honda clutch pedal. That external slave was made for that transmission only. Bolted direct to bell house. Ran very well for 35 years and I loved the hydraulic system...
    • Belizean
    • Thread
    • cj7 clutch cylinder hydraulic transmission
    • Replies: 1
    • Forum: Drivetrain
  4. I

    Clutch TO bearing "play"

    Hello, Changing out clutch on '68 CJ5 with Dauntless V6 and T-14 Trans. Torn down ok, lots to clean up. PO had oil leak for awhile. Measured for throw-out bearing. 3, 4 5 times, I'm sure it was correct. Setup adjustable TO bearing to correct measurement. Bellhousing, clutch fork with bearing...
    • its415dave
    • Thread
    • bearing clutch dauntless t-14 transmission
    • Replies: 7
    • Forum: Drivetrain
  5. O

    Trans Correct Torque Converter?

    Putting a 5.3LS and 4L60E into my 1979 CJ7. The tranny came with the torque converter, although I don't know what car or truck it came out of. I was told the stall is 1800 - 2000 RPM. Is that appropriate for my build? I will be using it for offroading (think Rubicon trail). Seems OK, but wanted...
    • oldcj7guy
    • Thread
    • build offroad stall torque transmission
    • Replies: 2
    • Forum: Drivetrain
  6. P

    Trans Omix-ada bell housing questions

    Has anyone used a new omix-ada replacement bell-housing before? It’s Omix part #16916.01 I need a bell-housing for my T150 transmission because of a few stripped holes and I believe the pedestal for the clutch fork ball is wore out/damaged. I know with some omix-ada and/or crown parts the...
    • PSully76
    • Thread
    • bellhousing quality questions replacement transmission
    • Replies: 14
    • Forum: Drivetrain
  7. G

    Trans T5 Shifting Linkage Problems

    I just got a 85 CJ7 with a Chevy 350 and the original T5 trans. It has a 2" spring lift, 2" shackle lift, 1.5" body lift, and a 1" transfer case drop. So the clutch is not disengaging completely. It's still spinning slightly when going in reverse. The free play in the pedal is less and .5" The...
    • gonzo4886
    • Thread
    • clutch linkage pivot shifting transmission
    • Replies: 7
    • Forum: Drivetrain
  8. G

    Trans T5 Shifting Linkage Problems

    I just got a 85 CJ7 with a Chevy 350 and the original T5 trans. It has a 2" spring lift, 2" shackle lift, 1.5" body lift, and a 1" transfer case drop. So the clutch is not disengaging completely. It's still spinning slightly when going in reverse. The free play in the pedal is less and .5" The...
    • gonzo4886
    • Thread
    • chevy 350 clutch linkage shifting transmission
    • Replies: 0
    • Forum: Drivetrain
  9. P

    Trans T150/Dana20 mounting question

    Hey guys! I’m new to owning a CJ and just got myself a ‘76 CJ5 as pictured here. My main question has to do with the mounting and mounting components of my trans/Tcase. I know that the main transmission bushing is mounted offset on the torque arm along with the torque arm bushing being mounted...
    • PSully76
    • Thread
    • arm bushing mounting torque transmission
    • Replies: 2
    • Forum: Drivetrain
  10. A

    Engine Mitsubishi 2.3l

    I recently bought a 1976 cj5 with no engine or transmission. I have a t150 transmission and Dana 20 transfer case and a 2.3l turbo diesel engine out of a ford ranger I’d like to adapt to it to make it drive able. Has anyone else out there done this combination? And reasons why I shouldn’t do...
    • ANDREWBLISS
    • Thread
    • adaptation cj5 drivetrain engine swap transmission
    • Replies: 0
    • Forum: Drivetrain
  11. B

    Trans Grinding gears

    Put a rebuilt Dana 20 on my t150 now when I shift it grinds just alittle in every gear and down shifting is impossible didn’t do this before the transfer case change what did I mess?
    • BBcj51960
    • Thread
    • dana gears grinding shift transmission
    • Replies: 1
    • Forum: Drivetrain
  12. C

    Trans I have a seventy eight CJ7 with a th400 transmission in it. Does anyone know where to find the linkage that bolts onto the frame for the transmission?

    I have a 78 CJ7 with a Th400 automatic in it. Does anyone know where to find the linkage that mounts to the frame across from the transmission shifter. I will include a picture, but it's rusted and broken to pieces. Any help would be greatly appreciated.
  13. A

    Trans Rebuilt t150 isn’t engaging 2nd gear

    I recently pulled the t150 transmission out of my 1975 cj5 because it was kicking out of first gear. I ordered and installed a rebuild kit and I have 1,3, and reverse but no second. When I push on the shifter it grinds and I can put it in and out of second with no clutch. I pulled the...
  14. D

    Trans T150

    I will be crawling under my 77 CJ7 this weekend to drain and fill transmission and differentials. With regards to the transmission, is there a better way other than dropping the cross member/ skid plate? I have heard people allude to this but haven't heard how. First post here, so take it easy...
    • ddickey
    • Thread
    • differentials drain fill t 150 transmission
    • Replies: 4
    • Forum: Drivetrain
  15. E

    Trans grinding

    I have a 196 cj7 with a t-5 tranny there's a rattling noise when I let off the throttle coming from the transmission any ideas? i can shift fine without any noises It only seems to happen if I accelerate or decelerate.
    • eddie12388
    • Thread
    • accelerate grinding noise rattling transmission
    • Replies: 9
    • Forum: Drivetrain
  16. BMK84CJ572

    Trans Rebuilding T15 Transmission

    I'm in the process of rebuilding my transmission. I ordered the master rebuild kit which was supposed to come with instructions, but they either weren't included or I accidently tossed them out. I've emailed Novak to see if they will send a pdf version, but I thought I would post my questions...
    • BMK84CJ572
    • Thread
    • instructions rebuild shifter synchronizer transmission
    • Replies: 3
    • Forum: Drivetrain
  17. 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...
  18. 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
  19. 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
  20. 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...
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