T18 A identification - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-02-2006, 05:21 PM
berg
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T18 A identification

Can anyone tell me how to identify a T 18 A. The transmission with the 6.32 first gear?

Thanks for the tips

Greetings

Ewoud v d Berg
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post #2 of (permalink) Old 09-02-2006, 06:07 PM
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Re: T18 A identification

Click on the graphic...it will give you the information you want.

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post #3 of (permalink) Old 09-03-2006, 06:19 AM
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Re: T18 A identification

Welcome to the board! What are you building?

The easiest way to tell the T18A from the close ratio transmission is to shift it into 1st gear and turn the input shaft. If it takes over six turns to make the output shaft turn once, it's the wide ratio box. The close ratio version is about 4:1.

If it's in a vehicle that won't run I don't know of any sure way to tell, but if you post what vehicle it's in, someone here can probably tell you which transmission was used. I think that International Scouts used the close ratio version, and Ford trucks used the wide ratio, for example. All Jeeps used the wide ratio.
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post #4 of (permalink) Old 09-03-2006, 06:25 AM
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Re: T18 A identification

Actually Jim the early cj's used the close ratio T18.
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post #5 of (permalink) Old 09-03-2006, 06:51 AM
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Re: T18 A identification

Really! I stand corected. Again!

Do you know what years used the close ratio?
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post #6 of (permalink) Old 09-03-2006, 09:35 AM
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Re: T18 A identification

Wide ratio in the CJ was 76-79. the close ratio was 72-76 if I'm not mistaken.
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post #7 of (permalink) Old 09-03-2006, 01:32 PM
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Re: T18 A identification

Well thanks for the infromation. I can buy a 73 CJ-5 with a t18 and the guy is saying its a 6.32. But I want to be sure. Thats why I am looking for a kind of identification. The best way is finding a number or a code.
post #8 of (permalink) Old 09-03-2006, 03:59 PM
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Re: T18 A identification

[ QUOTE ]
The best way is finding a number or a code.

[/ QUOTE ]

No, the best way it to count the turns of the input shaft to the output shaft. Gearsets can be interchanged.

Or if you have experience with Jeeps, just driving it will tell. If idling in 1st gear is an easy walking speed, or in 1st gear low range is a slower-than-comfortable walking speed, it's the 6.32.
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post #9 of (permalink) Old 09-03-2006, 07:06 PM
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Re: T18 A identification

If I'm not mistaken, the input shaft on the 72-76 (close ratio) CJ T-18 is slightly longer. Seems to be a familiar piece of info stored in my gray matter, but I don't have any hard fast info to back that up. The longer input shaft would also mean a longer bellhousing.

But as Jim said, only sure fire external method is to count rotations of input vs output.
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post #10 of (permalink) Old 09-03-2006, 07:27 PM
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Re: T18 A identification

Not trying to kick Jim but that walking speed thing isn't very reliable ..... diff gears can mask the tranny gear ratio. IMHO 3.73 is a very fast walk. 4.10 is a fast walk and so on but it's Vodoo Science.
Counting turns is the only way to know for sure (like he said).
How you going to do it while it's in the vehicle? Not going to be easy. Need to know the diff gear ratio. Turn the motor one turn, then count wheel turns and do some math. Might be easier to take his word for it or get it in writing.
Is it a Jeep or Ford w/adapter T-18? Ford has rectangle bolt pattern at the bell housing. Jeep isn't (Leve's picture is a Jeep T-18). I've never seen a Ford that wasn't the wide ratio but no guarentee.

The T-98 looks a lot like the T-18 and is often mistaken for a T18. The T-19 looks like a twin to the T-18, just different guts and markings.

Good luck
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