T18 in a CJ5? - JeepForum.com

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post #1 of 22 Old 09-05-2009, 12:48 PM Thread Starter
Dad03
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T18 in a CJ5?

I went out today with some experienced 70's Ford Bronco guys. I was in new territory and they took me up some steep hills (at least seemed pretty steep climbing them). My little CJ5 performed well but I definitely need to get a lower first gear for crawling. My t-15 just isn't low enough. I am told the CJ5 won't easily accept an auto so I am thinking a 4 speed is the best option. T-18 or 18A.

Will a T-18 bolt up to the Dana 20 fairly easy

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post #2 of 22 Old 09-05-2009, 12:59 PM
turnabout
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The bolt-up to a D/S20 can be quite simple if it came out of a CJ. The issues lie in having the proper bell housing, drive shaft length(s), and possibly a tunnel added to the floor area for clearance issues. With some decent fab skills and a drive shaft shop nearby you could pull it off.

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post #3 of 22 Old 09-05-2009, 01:22 PM Thread Starter
Dad03
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The Dana 20 is original on the CJ-5. I also have one from a J-20. I guess the bellhousing is the only thing I am unfamiliar with. Driveshaft and tub mods are no problem. Time to do some homework.
As puckered as I was climbing those hills I am ready to go do it again!
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post #4 of 22 Old 09-05-2009, 01:55 PM
1986cj
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I had a 79 CJ5 with a 258 T18/20 combo stock so it all is out there
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post #5 of 22 Old 09-05-2009, 02:57 PM
Full Tank
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As mentioned above, if you can find a T18 out of a CJ you're golden.

The confusion arises when people try to use a T18 out of a ford truck. That's when you have to pay one of the adapter companies some serious coin for adapters.

FT

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Dana 30--AMC20--D300--T176--258

1986 CJ7
Dana 30--AMC20--D300--T5--2.5L
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post #6 of 22 Old 09-05-2009, 10:18 PM
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Quote:
Originally Posted by Full Tank View Post
As mentioned above, if you can find a T18 out of a CJ you're golden.

The confusion arises when people try to use a T18 out of a ford truck. That's when you have to pay one of the adapter companies some serious coin for adapters.

FT
The problem is most stock CJ T18's have the 4.0 to one first. This isn't nearly as desirable as the "A" model with the 6.3 granny low. They are also hard to find and fetch a premium price.
The 75 bellhousing may need adapting/replacing, as you probably have the T15 transmission.
My suggestion is a Ford T18, Novak or stock used mainshaft/adapter, 76 or later bellhousing from a 150/176 application. This will leave you with a fairly bolt in setup that may only require some driveline work and minor sheet metal adjusting.
The other option is a gear swap, however depending on your existing gears and what you opt for,, this may effect your on road drivability.
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post #7 of 22 Old 09-06-2009, 08:57 AM
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There are some Jeep CJ t-18's that came in the wide ratio (6.32-1). Specifically 78-79.

More info here. http://www.jeeptech.com/trans/t18.html

1980 CJ-7 with a AMC 401, RE 4.5" Lift, 4-1 Dana 300, Holley TBI Projection, 35" Goodyear MTR's
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post #8 of 22 Old 09-06-2009, 09:02 PM
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You can also look at the 6cyl J trucks. I found one from a 79 and my driveshafts were close to my T176 D/300 combo length.
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post #9 of 22 Old 09-07-2009, 05:13 PM
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I have a 1977 Cj5 with a stock t-18 with the 6.32:1 1st gear.

'77 CJ-5---'63 Scout 80 FOR SALE---'71 Scout 800B---'78 F-250 Camper Special---'75 Econoline 100
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post #10 of 22 Old 09-07-2009, 09:46 PM
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Quote:
Originally Posted by Cherokeester View Post
There are some Jeep CJ t-18's that came in the wide ratio (6.32-1). Specifically 78-79.

More info here. Jeep Transmissions: T-98, T-18, T-18A
True, My statement was geared more toward informing that many of the stock CJ units commonly have this gearing
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post #11 of 22 Old 09-08-2009, 06:27 AM
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For the intermediate years you will need a T150/T176 bell housing. The T15 bell is the wrong bolt pattern. I went with J truck T18 and put a short shaft kit from Parts Mike. It was less $ than modifying a Ford T18. You'll have to lengthen/shorten drive shafts. All things considered a Teralow kit isn't much more and your driveshaft length is happier. 48:1 compare to 36:1.

Anything is possible if you don't know what you are talking about.
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post #12 of 22 Old 09-08-2009, 10:28 AM
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'80 and newer Jtrucks with V8 got T18, but it's the Ford version with an extra long input shaft and a spacer between the trans and bellhousing. You can install the shorter input shaft, but they also are 31 spline with NP208 from a Ford attached (until recently I thought they were 23 spline like the other Jeeps)
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post #13 of 22 Old 09-08-2009, 01:29 PM
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How much will the drive shafts change?
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post #14 of 22 Old 09-08-2009, 02:22 PM
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The T18 is 11.87" long. Your T15 is 10" long. Not that the length of the transmission determines true driveshaft length (you have angles and stuff to deal with) but you're looking at almost a 2" difference. A local driveshaft shop can handle the shortening/stretching. If you use adapters, the extra length will have you shopping at Tom Woods for a double cardin driveshaft and the need to reseat your rear axle to an acceptable angle.

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post #15 of 22 Old 09-08-2009, 07:09 PM
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I'm not sure about the frame of a 75' CJ, but in 78' there is another hole in the frame towards the back of the Jeep to move the skidplate/cross member back to accomodate the additional length of the T-18. The T-18 was an option for 1975 so your frame may have the same holes in the frame to accomodate the length. Finding a T-18A from a CJ, while difficult to find these days, is not impossible. Next best thing would be a T-18A from a full size Jeep and install the short shaft kit. The T-150 bellhousing is the same for the T-18 and are relatively common.
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