Before I buy this T-18a - JeepForum.com
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post #1 of 11 Old 02-20-2020, 01:04 PM Thread Starter
weider1717
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Before I buy this T-18a

Guys,

Found a T-18a as I'm told it has the 6.32 1st gear and rebuilt. What will be required exactly? I am trying to read without making a new post but it depends on which t18 etc and it gets confusing.

This one its a T-18A which I read only came in 78-79 CJ's I asked him the casting on it which he said is 87-14? Surely there is more casting than that so not sure.

I read some require cutting the floor pan and more drilling etc not sure if that is the case in a cj7 or a cj5 or all?

Mine is a 78 cj7 with the 304, t-150 and dana 20

thanks for any helps with this

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post #2 of 11 Old 02-20-2020, 01:17 PM
caseypotts
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I didn't need to cut the floor but I did need a new tunnel cover.
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post #3 of 11 Old 02-20-2020, 01:27 PM
caseypotts
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I didn't need to cut the floor but I did need a new tunnel cover.
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post #4 of 11 Old 02-20-2020, 01:51 PM
Matt1981CJ7
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If it has the the short Ford 6-1/2" input shaft stick-out, you will need a custom pilot bushing. Novak sells them.

Your T-150 bell-housing will work fine.

Your T-150 clutch kit should work fine, as well, but it may be a good time to install a new kit.

Assuming it's a Ford T-18, you will need an adapter to mate your D-20 t-case to it.

The overall length of the T-18, with t-case adapter, will be longer than your T-150, so you will need different driveshafts.

You will need a different transmission tunnel cover, or modify the one you have.

You will probably need a different reverse light electrical connector for the T-18

Other than that, it should be a fairly straight forward swap.

Good luck,

Matt


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post #5 of 11 Old 02-20-2020, 02:10 PM
HackFabrication
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Quote:
Originally Posted by weider1717 View Post
This one its a T-18A which I read only came in 78-79 CJ's I asked him the casting on it which he said is 87-14? Surely there is more casting than that so not sure.
So, this is important: Is it the Jeep version of the T18 or a Ford T18? There are a few differences.

If it's the Jeep version, and it came out of a CJ, you're not going to need to gut the transmission and put in a new mainshaft. If it came out of a FSJ, you'll need a new input shaft, as it will be too long. If it's the Ford version, you will need to put in a new main shaft.

"In the end...It's all Hack."
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post #6 of 11 Old 02-20-2020, 02:11 PM Thread Starter
weider1717
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Seller says this is a “Jeep” t-18
assuming that means this came in a CJ when new
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post #7 of 11 Old 02-20-2020, 08:49 PM
CSP
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Don't assume anything when it comes to T18s, there are way too many possible variations to assume safely. Do not rely on casting numbers either. I could write a small book on this subject.

Some solid links with T18 information: http://www.jeeptech.com/convtrans/convt18.html (thanks Terry Howe, I'm still using this website!)

http://www.novak-adapt.com/knowledge...anual/t18-t19/

If it doesn't have an input shaft that has about 6.75" of stick out length from the front face of the case it is not a CJ version with the 6.32:1 first gear.
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post #8 of 11 Old 02-22-2020, 12:40 AM
RedNeckCorvette
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Rotate the input shaft in 1st gear and count six at the output shaft. That, or slightly over and that problem is solved. They made a 4.02:1 ratio also.
If the input shaft is not 1-1/8'' but is smaller in diameter ''I have to think'' maybe 1-1/16'' there is a good chance it came from a CJ7 and was a factory T-18 transmission that will bolt right up to your T150. Be careful the T-18s for AMC pickups have a very long input shaft about 12 '' long x 1-1/8''
Not out of the woods yet! You will need to modify your drive lines front and rear and I would advise looking into a CV joint in the rear with a larger pipe in the front for strength, if it will fit.
Good luck get it cheep after they sit long enough people forget what they are worth.
I have a few sitting around here and there if you have further questions maybe I can answer.
Not always on line just lurking.
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post #9 of 11 Old 02-26-2020, 08:54 AM
exheep
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I needed to move my skid plate back on my 76 CJ5 to accommodate the T18 . Fortunately the frame was pre-drilled with captive nuts.
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post #10 of 11 Old 02-27-2020, 07:53 PM
mikeyboat
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I learned the hard way that not all Dana 20s are equal.

https://www.jeepforum.com/forum/f8/s...l#post40886821

I was told my T18 came out of a Wagoneer. I bought the whole drivetrain; engine, transmission, and transfercase, all bolted together with a buggy being built around it.

I knew my original transfercase from my T150 was good, so I decided to run that. Everything seemed to go together fine, could shift through all positions in the case, but I had this whine when the gears were floating - or not under load.

Pretty sure someone mentioned this possibility when I was trying to diagnose the whine, but this page right here: https://www.novak-adapt.com/knowledge/gear-table/ will let you know what works together.
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post #11 of 11 Old 03-03-2020, 09:58 PM
CSP
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Quote:
Originally Posted by RedNeckCorvette View Post
Rotate the input shaft in 1st gear and count six at the output shaft.
You want to count how many revolutions of the input turn the output one revolution.

Quote:
If the input shaft is not 1-1/8'' but is smaller in diameter ''I have to think'' maybe 1-1/16'' there is a good chance it came from a CJ7 and was a factory T-18 transmission that will bolt right up to your T150.
Yep, 1-1/16" and any 76-79 CJ could have had this transmission.
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