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Old 10-06-2012, 06:14 PM   #1
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thoughts on a t-18 transmission

I have just bought a jeep project and it has a t18-1b transmission with the 6:32 low gear. What are your thoughts on this transmission? Pros vs Cons if any? I have been told that its a tuff transmission.

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Old 10-06-2012, 06:30 PM   #2
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in my opinion it is a lot tougher than anything you can get in a jeep these days..I ran one behind a 327 pulling 38 inch tires with 5.38 geared axles and never had any problem

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Old 10-07-2012, 08:04 PM   #3
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It's about the best factory gearbox made. People spend big bucks getting those into their jeeps (trust me).
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Old 10-07-2012, 08:35 PM   #4
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I was thinking the only T18 options for CJs were the T18 (4:1) or the T18-A (6:1). Maybe some full sized jeeps had T18-Bs?
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Old 10-07-2012, 08:47 PM   #5
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um, if you dont want it i will take it off your hands!
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Old 10-07-2012, 09:45 PM   #6
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Amc produced an astonishing 13 different t-18 tranissions. The golden egg you seek is a 76-79 cj7 t-18 or a swap from a ford truck. I just finished a np435 because almost all of them are geared at 6.92/1 granny and were put in ford trucks for something like 30 years. If you already have a amc v8 then you will only need a trans case adapter and a pilot bushing. If you have am i6 you will need the bell housing as well...maybe clutch linkage as well but not certain. On the plus side the t18 may bolt straight up to your skid, I moved mine back, dropped it an inch and redrilled holes and trimmed a hair off of the front of the skid lip to fit it in. Its a pretty tall transmission. On the plus side I paid less for my np435 swap than it would've cost for a correct t-18 by itself. Also, do not get the fsj t-18 without planning on swapping the input shaft.
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Old 10-07-2012, 09:50 PM   #7
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Correction. 435 is 6.62/1. With 4.56 gears I'm just shy of 61/1 in granny gear low.
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Old 10-09-2012, 06:36 AM   #8
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I installed a Jeep T18-1B in my '71. Best single mod I made to that rig over 16 years.

The tranny did need to be modified. Mine came out of a full size Cherokee, and had a ~12" input shaft. I had to replace the input shaft with a 6.5" one. Not too difficult, instructions are out on the net at various places.

I suggest you look at Parts Mike as a source for anything you need for your T18 installation. Parts Mike has been doing/providing parts for T18 swaps in CJs for more than 20 years.

Also check out Novak for any adapters you may need. Look at Novak's website, click on "Knowledge Base" and read about T18 info, and how they can also help with your T18 swap, with adapters, specialty pieces, etc.

No matter how much you spend on doing this swap, once you get your rig offroad and see the difference it makes, you'll never regret it!!

Good luck!

EDIT: I just re-read that the T18 is part of the project you just bought. If you're lucky, it's already installed, and you can just use the souces I cited as back up for info and parts if needed...
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Old 10-11-2012, 07:51 PM   #9
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I have a granny low T18 bolted to a 1980 Scout Dana 300 now that's the cat's butt. LOL
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Old 10-11-2012, 09:15 PM   #10
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Quote:
Originally Posted by RubiconRich
I have a granny low T18 bolted to a 1980 Scout Dana 300 now that's the cat's butt. LOL
I'm going to put my 6:1 T18 on my Dana 300 with the 4:1 low gear conversion. I'm assuming it will become, for all practical reasons, a three speed with crazy low 4wd capabilities.
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Old 10-12-2012, 12:04 PM   #11
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Quote:
Originally Posted by Cj7otr

I'm going to put my 6:1 T18 on my Dana 300 with the 4:1 low gear conversion. I'm assuming it will become, for all practical reasons, a three speed with crazy low 4wd capabilities.
Yep, I'm running a final ratio of 30:1 in high and 1st gear is useless on the street and I'm running 35's.
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Old 10-12-2012, 07:51 PM   #12
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and don't forget to add a twin stick to the 300!
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Old 10-13-2012, 01:17 PM   #13
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Quote:
Originally Posted by RubiconRich
and don't forget to add a twin stick to the 300!
Done!

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