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post #1 of (permalink) Old 01-06-2006, 11:15 PM
Mr. Mohr
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T18a Exploded diagram?

Anyone know where I can get an exploded diagram on the Jeep T18a transmission? I bought one used and the input shaft appears to be bent so I have the thing half way apart but shes a little tricky.

Any tips / help will be greatly appreciated!

Just a little background on me:

My story is that I am a ford guy from way back. My first car was a 70 mustaing 302 2V automatic notch back. Once upon a time I had my first project car in the garage, an 67 GT fastback that my father had given me before he died. I had the engine out and was going through that whilst working on the body.

My new wife put an end to my automotive hobby days by driving the family car (escort wagon) 8 miles down the highway after bursting the radiator hose. The only way I could come up with money to fix that stupid escort was to sell my GT. That was 20 years ago and I gave up on motorsports after that. Until last year.....

Most of my kids are grown up now and I am on my second wife. I was driving around in the little town in Nebraska we lived in at the time and came across an 84 Jeep CJ7 sitting on a guys front yard. Needless to say 2K later I had a new toy.

The engine had bad rings and was an AMC 258. I pulled it out originally thinging I would re-ring and bearing it and throw it back together and beat that bitch like a theiving hooker. hehehe.... but then a guy threw an add on the bargin box in my new hometown of Fort Collins Colorado. 89 Ford 5.0 HO motor w/ computer complete, $100. Shazam.

So now I am fully immersed in building a beast to put into my CJ7 which is at the same time undergoing a face lift in the garage. I am just loving being back to playing with an automotive toy! The reason I joined the group is because I know that there is a lot of help out there if you just ask!

So... what I have so far for the engine is this:

Original block unbored
New .030 over keith black flat top pistons
Original crank, unturned.
New Edlebrock cam #2221 for 1500 to 6500 RPM power
New Ford Racing Roller Lifters
Edlebrock Aluminum Performer RPM heads 2.02 and 1.6
Crane 1.7 Roller Rockers for 3/8 studs
New Ford Racing Aluminum Valve Covers
New Ford Racing GT40 Aluminum EFI intake
Professional Products 75 MM throttle body
Pro-m 80mm MAF
New fluid harmonic balancer
A9L computer
Raptor Electric inline fuel pump
BBK Fuel Regulator w/ gauge
New Radiator with electric fan

Still to come / want list:

New Front and Rear Rockcrawler bumpers
New Custom Roll cage
Rebuild kit for T18a
New Axle Shafts/ rebuild kit for Dana 30
New Master kit for Dana 30 and AMC20
New brakes, all axles
New injectors 30Lb
New Fuel Rails
New large tube headers
New O2 Sensors and others...
New Painless 5.0 MAF wiring harness
New tweecer for tuning
New billet serpentine setup
New inline fuel filter
Recalibrate my Pro-m for 30Lb injectors
New Steel Flywheel
New King Cobra clutch
New Moser 1 Piece axles for the AMC20
New Flowmasters
New Mastercraft Seats
New Carpet and door panels / visors
New window glass w/ tint
New Stainless Steel Dash w/ custom gauge cluster for autometer gauges
New Autometer C2 speedometer, water temp, oil pressure, voltage and fuel mixture gauges

large beautiful field to rip to shreds with my 33" baja claw radial tires! Hehehe...

Other things already purchased for the jeep besides engine stuff!

Kenwood stereo w/ subs and amps with 4 speakers
Thor Sound Wedges and Centrapod enclosures
Phoenix Gold Amps w/ 1/2 farrad caps
Detroit Lockers and 4.10 gears front and rear
33" Baja Claw Radial tire3
4" Superlift with new shocks and steering stablizer
Autometer C2 tach w/ shift light
Jeep T18A Heavy duty low range transmission
Dana 20 and / or 300 transfer cases
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post #2 of (permalink) Old 01-06-2006, 11:24 PM
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Re: T18a Exploded diagram?


might help a little...
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post #3 of (permalink) Old 01-07-2006, 09:07 AM
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Re: T18a Exploded diagram?

You finally found us. Welcome to the board!

There were two versions of the T18a, and I don't think either was available in '84 Jeeps. What you have was probably swapped out of something else. Just to give you a warm fuzzy, Ford pickups were common donors.

The difference was in the reverse gear arrangement. The case, top cover and shift pattern were different. In my stock '78 Jeep reverse is right and forward. In others it was left and back, I think.

I doubt that the different cases made a difference to the input gear, but you should determine which you have anyway. If you have a Jeep transmission, I can scan the pages from the '78 FSM for you.

On the subject of your engine build, I think you're headed in the wrong direction. The cam, intake and big valve heads suggest that you're building a high-power engine. Jeeps work better off road with lots of low-down torque, good smooth idle, and good off-idle throttle response.

What you have will work, but an engine built to move a heavy truck would work better off road.
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post #4 of (permalink) Old 01-07-2006, 10:58 AM
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Re: T18a Exploded diagram?

I used the Parts Mike info and a Transmission Technologies Corp (Tremec) Bulletin No. Ld18-0410-0199. I brought it on Ebay but it's available other places (so I'm told). The bulletin is basicly a service manual with part numbers, photo, etc.
With these two info sources I was able to use my Jeep 4:1 low T-18 case and install Ford T-18 6:1 low guts into it. This allowed me not to buy the Ford to Jeep adapter.
If you decide to go with the adapter, I think I have a good Ford input shaft in my parts pile. PM me if your interested.

I'm not positive but I think the Alum top T-18's had the newer reverse gear location. (right & down): older versions had cast tops and reverse to the right & Up.

Good luck
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post #5 of (permalink) Old 01-07-2006, 11:36 AM
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Re: T18a Exploded diagram?

I can say that in my T-18 reverse is to the right and back. I couldn't tell you what the top is made of as I never really paid attention when I had the tranny on the floor.
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post #6 of (permalink) Old 01-07-2006, 12:36 PM
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Re: T18a Exploded diagram?

HERE's a good rebuild site..
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post #7 of (permalink) Old 01-07-2006, 01:06 PM
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Re: T18a Exploded diagram?

Excellent link Larry.....
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