T-18 guts swap to make T-18A? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-10-2000, 01:10 PM Thread Starter
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T-18 guts swap to make T-18A?

A friend just bought a T-18 and is interested in doing the swap to get the T-18A gears. Is there a writeup anywhere? Can anyone help? It's the T-18 that came stock in the 1974/75 CJ-5 and is mated to the 232 and Dana 20. He wants to keep the drivetrain but wants better gears.

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post #2 of (permalink) Old 10-10-2000, 04:15 PM
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Re: T-18 guts swap to make T-18A?

JEEPN-

I have never seen anything that addresses the changing of the T-18 gears to get the lower gearing setup. I would think that with the never ending search for a lower crawl ratio, it would have been done by now if it could be cost effective. On the other hand, maybe this is a business opportunity!

Kriss

post #3 of (permalink) Old 10-10-2000, 04:42 PM
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Re: T-18 guts swap to make T-18A?

I know there is a guy here in Phoenix who does that conversion. You give him a working T-18 and $675 and he turns it into a low gear T-18. Not a T-18a necessarily, because I think a T-18a bolts to a Dana 300.
Seemed expensive to me, since the Dana 20 is still in there and it only reduces at 2 to 1 in lo. I am trying to get ot around 75 or 80 to 1, so I am putting in a NP435 and Dana 300. There is a write up on this site for that conversion and some other info on T-18's at http://www.off-road.com/jeep/tech/Trans.html

'74 CJ-5, 258, NP435, D44 w/LockRite
(OK, well the np435 is in the garage next to the Jeep)
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post #4 of (permalink) Old 10-10-2000, 05:19 PM Thread Starter
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Re: T-18 guts swap to make T-18A?

I am just curious, can you swap gearsets from a Ford T-18 that's 6.32:1 into the Jeep T-18 that's 4:1? The original input and output shafts would have to remain in the Jeep tranny though.

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post #5 of (permalink) Old 10-10-2000, 05:31 PM
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Re: T-18 guts swap to make T-18A?

That I don't know, I have never opened a Ford T-18. I will try and find out.

'74 CJ-5, 258, NP435, D44 w/LockRite
(OK, well the np435 is in the garage next to the Jeep)
post #6 of (permalink) Old 10-10-2000, 05:36 PM
 
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Re: T-18 guts swap to make T-18A?

this has been covered before, But I swear I cannto rememebr for sure, But I THINK, there is a fundamental differnce in the input shafts and first gear cogs maybe.

ask Parts Mike, he would know for sure.

BTW the T18a was a designation used in the later years to designate the 6.32:1 first gear, not a transfercase application.


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post #7 of (permalink) Old 10-10-2000, 07:17 PM
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Re: T-18 guts swap to make T-18A?

In regards to the INPUT shafts, ford to jeep, they are interchangeable. I've heard people trying to use a jeep factory transfer case adapter on ford t-18 and they had to plug a bunch of holes. Personally, from my experience with T-18's, I'd say that the swap wouldn't be too tough. If you use the main shaft, case and transfer case adapter from the jeep t-18, and swap in the rest from the ford t-18, your safe. By using the ford input shaft you get a few more inches of driveline anyway. I never could figure out why jeep used those silly super long input shafts anyway. In my flat fender I run a jeep t-18a with the ford input shaft, so I know that swap at least works.

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post #8 of (permalink) Old 10-11-2000, 09:58 AM
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Re: T-18 guts swap to make T-18A?

In order to go from the 4-1 gears to the 6.32-1 gears you have to change the cluster, input, and several
other gears. The main drive for the 6.32-1 has 17 teeth while the 4-1 has 23 teeth. That necessitates
finding the 17 tooth input shaft the correct length for the Jeep case and these can be very hard to come
by. Especially if you look in the Borg Warner book and see that something like 12 o13 different lengths
were used in the T-18. The easiest is as was suggested, go with the Ford input and case and use
the T-150/T-176 bellhousing which makes it a bolt up to the engine with no adapters. Only thing you
need to do is have a pilot bushing machined for the ford input or buy one from several suppliers like Novak,
Advance Adapters, R&P etc.
$675 for a gear swap is pretty high unless that guy is supplying you with the correct input shaft to use
all your existing adapters. I know a place that sells Ford cased T-18's with 6.32-1 already adapted to
18 or 20 transfer case using a machined steel adapter for $750 exchange. I think they have $100 core
charge but that is completely rebuilt with a new mount and pilot bushing and comes with the top and stick.
They can adapt to Jeep 300 cases also and also modify the T-18 cases to bolt directly up to GM
bellhousings with no adapters. If interested e-mail me and I will give you their #.
The reason Jeep used the long adapters with the pickups and Wagoneers is to push the transmission and
transfercase back so the shifters would clear the dash and firewall. the only thing I could think of with the
CJ-s is to use up existing stocks of cases. It's a lot cheaper production wise to shorten a shaft and build
a cheap adapter than cast a whole new transmission case. Good luck. Nickmil.

post #9 of (permalink) Old 10-11-2000, 11:12 AM
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Re: T-18 guts swap to make T-18A?

Hey Mark,

The Ford internals SHOULD work with the Jeep input shaft. The reason i say this is because i had a FORD input shaft installed on my JEEP T-18 (because it came from a J truck) and that is all that was swap, and the input side bearing retainer as well. The Ford and Jeep input shaft vary in Dia by 1/16" but are both 10 spline so make sure you get the right clutch and such.

I dont know if i am much help or not but Check out my swap at:

http://ct-web.unh.edu/yankeetoys/kspeicher/t18.htm

There are a bunch of links on there that may help ya

Best Of Luck
















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post #10 of (permalink) Old 10-11-2000, 06:16 PM
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Re: T-18 guts swap to make T-18A?

JEEPN-

At $675 plus I see why I have never seen a write up on this swap out. I paid about that for my 1977 CJ T-18A with no exchange that had been gone through.

Good Luck!
Kriss

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