T-18s

[Cecil14]

Which T-18s/T-18As have the granny gear? I know they switched the model # from one the other at one point, but not sure when. Thanks peoples.



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1983 J-10 resto project
1979 J-10 parts rig
http://fsjeep.homestead.com/files/Hosted_Pix/Cecil14_Jeep.jpg

[scotty]

to my knowledge,all fsjs got the granny gear. id try and verify before handing over any nonrefundable cash,tho. unfortunately,only way is to count input turs to 1 output turn. noting in the casting #s will tell ya ratio.

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scott
85 grand wagoneer
258 with motorcraft 2bbl/t18/spicer 18 with pto/widetrac offset d44s/rear discs
38x15.5 gumbo mudders
snorkel/dual batteries/onboard air/"custom" convertable
3 inch body lift/mostly stock suspension/"modified" fender openings
custom front/rear bumpers and brushgaurd

vw turing brake,BIG tow truck PTO winch and full roll cage install very soon
4.0 aquired-4.5L stroker someday...

now we can do some 'wheelin!

[Kaiser Volfe]

I though the Cherokees used the close ratio T-18.

[scotty]

i dont think so.post 1980 used a t176,but im pretty sure all fsj t18 were wide ratio. kryel is using a 6 cyl t18 from a late 70s chero,and it is wide. our other friend is using entire drivetrain from a 79 chero(360,t18,etc.) and it is also wide.have not talked to anyone yet with a close ratio in or from a fsj.

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scott
85 grand wagoneer
258 with motorcraft 2bbl/t18/spicer 18 with pto/widetrac offset d44s/rear discs
38x15.5 gumbo mudders
snorkel/dual batteries/onboard air/"custom" convertable
3 inch body lift/mostly stock suspension/"modified" fender openings
custom front/rear bumpers and brushgaurd

vw turing brake,BIG tow truck PTO winch and full roll cage install very soon
4.0 aquired-4.5L stroker someday...

now we can do some 'wheelin!

[Kaiser Volfe]

I just looked at the tech sections and say about how they switched for the old T-18 designations to T-18(close) and T-18a(wide), but doesn't say what applications. Have a friend who has close ratio T-18s in both his cherokees, but they could have been swapped in.

[This message has been edited by Kaiser Volfe (edited June 09, 2001).]

[Stuka]

I have a T18a in my 75 cherokee. Granny gear is unsyncronized 6.32:1 (you have to rockk to get it in sometimes) reverse is like 4.2:1, its also un scynroed, if you are barely moving you cant put it into reverse. 2nd gear on the T18a is 3.09:1, 3rd is 1.9:1, 4th is 1:1. This tranny is FAR from being a close ratio. I personally like it tho. I can snap your neck in almost any gear. I cannt start out in 3rd gear. Supposably the T18a wasnt available until 76 cherokees. Mine was a custom order from the factory tho, so I guess thats why it has the T18a. The standard T18 had a 4.3:1 1st gear if i remeber right. Which is still really low.

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<UL TYPE=SQUARE>
1975 Cherokee
360 w/ Edelbrock Performer Intake and Carb
T18a
Spicer 20 T-Case
Dana44 w/3.54 Gears
[/list]

[This message has been edited by Stuka (edited June 09, 2001).]

[Kaiser Volfe]

Stuka shouldn't your T-18a have a 7.** something reverse, I know both of mine do.

[Stuka]

kaiser, very possible. I know its ****ed low. Now that I have a tach (just installed today) I will compair rpm's for speed. I know that I can back down super steep hills, and will only go like 3mph with out the brakes, just compression.

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<UL TYPE=SQUARE>
1975 Cherokee
360 w/ Edelbrock Performer Intake and Carb
T18a
Spicer 20 T-Case
Dana44 w/3.54 Gears
[/list]

[UnkleMunky]

Just for addition, the J20s used the T-18(wide ratio) from 80-83 as well if everything I've heard is correct. These were ONLY behind a 360 due to being ONLY in the J20s of those years, but would have a 2.6x:1 low range in the NP t-case too, for some REAL grunting!

I have to side with Scotty on what I've heard with the T-18s in FSJs....that ALL were likely the wide ratio. I haven't heard of a close ratio in one of these(stock) rigs yet! The "little" Jeeps(CJs) used the close ratio until '76 or so. THEIR '76-79 models are the "coveted" T-18a with wide ratio, and we all know THEY get more "publicity" and "news" than our big rigs, so much of what I've read on the T-18s comes from the CJ perspective, which to me isn't all that informative!

Reverse SHOULD be a good 7:1 or so....pretty close to the 6.32:1 in 1st gear, at least more or less. My 78 J10 with 258 has the wide ratio T-18 and I LOVE it....I'd love to find another with this combo!

Anyway....if anyone knows otherwise about close ratios in FSJs, let us know, but I'm like Scotty, only heard/known of wide ratios in these rigs!

Take care...

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Michael(UnkleMunky)
'78 J10: 258, 4 speed, longbed, topper
'76 J10: Honcho, 360, TH400/QT
'89 Plymouth Reliant(PluggerMobile)
J-Pages(some of my auto pages) (http://www.eskie.net/superior/j-pages/index.htm)
unklemunky@eskie.net

[Cecil14]

Ok, guys. Thanks a bunch for the info.
Got one question real quick: Ok, I spin the input(?) shaft and count the number of spins to one spin on the output shaft? is this right? How many should I have for a wide ratio T-18? a little over 6?

Thanks.

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1983 J-10 resto project
1979 J-10 parts rig
http://fsjeep.homestead.com/files/Hosted_Pix/Cecil14_Jeep.jpg

[Stuka]

1st gear on the T18a is 6.32:1, so the input shaft (engien side) will spin just over six and a quarter times for every one turn off the output shaft (t-case side)

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<UL TYPE=SQUARE>
1975 Cherokee
360 w/ Edelbrock Performer Intake and Carb
T18a
Spicer 20 T-Case
Dana44 w/3.54 Gears
[/list]