how to tell the difference between a t-18 and a t-18a

[Gwamp]

I have a t-18/D-20 combo that I am going to be selling and I am wanting to know which of hte T-18's I have. It is marked T18 1B on the case. Does this make it the closer ratio 4.02 first gear instead of the 6.32 granny geared T-18a?

[mandoneer]

t-18-1b is the 4 to 1 rate

[Gwamp]

Originally posted by mandoneer:
t-18-1b is the 4 to 1 rate

thanks, that is what I thought. I just wanted to make sure.

[Crazy_Jeepman]

Ummm I would double check that, I have seen the 6.32 to 1 in the 1B case. Put it in 1st, T-Case in Hi, turn the t-case output once, count the trans input, 4 turns 4.02, 6 1/4 is the 6.32. If it came out of a FSJ, I would bet it to be a 6.32 to 1

[Knucklehead]

Hey Gwamp, what do want for that set up?

Jon

[mandoneer]

I will check mine too I assumed that it was the 4 to 1 but who knows

[mandoneer]

yep 4 turns

[mandoneer]

http://www.off-road.com/jeep/tech/trans/t18.html good info on a t-18

[Gwamp]

Originally posted by Crazy_Jeepman:
Ummm I would double check that, I have seen the 6.32 to 1 in the 1B case. Put it in 1st, T-Case in Hi, turn the t-case output once, count the trans input, 4 turns 4.02, 6 1/4 is the 6.32. If it came out of a FSJ, I would bet it to be a 6.32 to 1

I will have to try that tomorrow to make sure. Thanks for the tip!

[Gwamp]

Originally posted by 66HD:
Hey Gwamp, what do want for that set up?

Jon

Probably $250. I just pulled it out and got it inside today. I need to open the cases up and make sure everything is in good shape. the tranny seems to shift fine in and out of gear. The T-case is sticky and needs to be "worked" a bit

[Knucklehead]

Let me know what you find. I'm interested if I can figure out the shipping. You want a new th400 and high range q-trac?

Oh yeah, and what bell housing does that t-18 use (as jeep used about 14 different t-18s)

Jon

[ December 31, 2003, 08:14 PM: Message edited by: 66HD ]

[scotty]

Originally posted by mandoneer:
t-18-1b is the 4 to 1 rate

the casting number has absolutely nothing to do with the ratio. both my t18(from behind a 360) and my friends t18(from behind a 6 cyl) are cast T18-1B as well,and both are the wide ratio-little over 6 1/4 turns in 1st. the only way to verify is to count the turns.

if the t18 is from a FSJ its prolly a wide ratio,i have never know a fsj to come with a 4:1,close ratio t18

if its from a cj,it doesnt really matter,cause the cj guys will pay big bucks for the short input shaft t18,regardless of the ratio [img]smile.gif[/img]

also,just a FYI, the link above has one bit of incorrect info- the 80+ t18/208 has a 31 spline output,not 23

[Crazy_Jeepman]

Originally posted by scotty:
</font><blockquote>quote:</font><hr />Originally posted by mandoneer:
t-18-1b is the 4 to 1 rate

the casting number has absolutely nothing to do with the ratio. both my t18(from behind a 360) and my friends t18(from behind a 6 cyl) are cast T18-1B as well,and both are the wide ratio-little over 6 1/4 turns in 1st. the only way to verify is to count the turns.

if the t18 is from a FSJ its prolly a wide ratio,i have never know a fsj to come with a 4:1,close ratio t18

if its from a cj,it doesnt really matter,cause the cj guys will pay big bucks for the short input shaft t18,regardless of the ratio [img]smile.gif[/img]

also,just a FYI, the link above has one bit of incorrect info- the 80+ t18/208 has a 31 spline output,not 23</font>[/QUOTE]Yup I agree, have seen the same, and have never ever pulled a 4 to 1 out of a FSJ, though that has only been a couple dozen over the years. [img]tongue.gif[/img]

[scotty]

now that i think about it,another friend has a t18 out of a 77 chero,from behind a 360 and its t18-1B as well. im pretty sure that even the t18/208 a friend is running in his xj from an 83 j20 is also cast the same.

[Grantshire]

Weren't the T-18B's all the long shaft FSJ T18's? I have never seen one that didn't have a 6.32:1 first gear. Don't the CJ, Scout and Ford T-18's have short(er) shafts? I think it was some of the Scout T-18's that also came with the 4:1 ratio.