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Unread 10-08-2010, 03:26 AM   #1
bprimrose
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1978 CJ5 
 
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t150 to t18 swap

Hi,
I'm looking for answers concerning a transmission swap. I have a 78 cj5 I6 T150/dana 20
I can get a 1980 cj5 I6 with T18.

1st how can I tell the gear ratio before I buy? I really want that granny gear for my farm work.

2 Is this swap very difficult and can an average backyard mechanic do it?

3 what parts will I need and what SHOULD I replace when doing this swap
Thanks
Brian

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Unread 10-08-2010, 05:11 AM   #2
4lowherewego
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1979 CJ7 
 
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whats wrong with your 4.2 and T150?

I mean I understand the T18 upgrade definately...
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Unread 10-08-2010, 05:42 AM   #3
bprimrose
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Why change

Well, the t150 pops out of gear so I assume it need rebuild. If I'm going to go through the work of taking it out and rebuild, does it make sense to change trans to a heavier, lower geared trans?
$300 for Jeep T18, driveshafts, bell housing I thought was good.
What do you think?
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Unread 10-08-2010, 06:09 AM   #4
4lowherewego
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be a fool not to =)

You're absolutely right, if ur gonna pull the tranny out and rebuild it...go for the stronger better geared T18 and be done with it!!
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Unread 10-08-2010, 07:33 AM   #5
79jeepincj7
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if hes giving you the transmission, transfer, bell housing and driveshafts it should all bolt right in if its the right input shaft (which it should be if its already in the jeep) If he isnt giving you the transfer it will all work with the Dana 20 off your T150 as well. For some odd reason when I put mine in I had to get a different pilot pushing because the shaft was bigger on the T18 than the T5 blew to pieces.

You can definitely do it. Take the driveshafts out, put a jack under the tail shaft, take the crossmember out and all the clutch linkage., starter and dust shield. I recommend taking the transmission off the bell housing to take it out leaving the bell housing on the motor and the same to put the new one in, put the bell housing up first but that's MY own opinion. I change them myself and the T18 is pretty heavy to lower and raise and line up just by bench pressing it, but its only a few hour job to have the old out and new in if you know what your doing.
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The VIN says its a 79 CJ
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Unread 10-08-2010, 07:36 AM   #6
CSP
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Provided the transmission has the short input shaft and has the 6.32 ratio, that's a great deal.

Put the transmission in first gear and see how many turns of the input result in one revolution of the output, or the tcase output if it's attached. Six+ turns means it has the granny first gear.
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Unread 10-08-2010, 08:00 AM   #7
78treehugger
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Just in case you are going by the sellers word that it's a T18. The 1980 CJ 4 speed wasn't a T18 from the factory. So if he is claiming it's the original T18 that came in the jeep he is incorrect. 76-79 were the 6.32:1 ratio trannies. Please correct me if I'm wrong. My 4 speed in my 1980 CJ is a T176. I believe the SR4 came behind the 4 cyl. Again please correct me if I'm mistaken. So make sure you look at the tranny to be sure it's the T18.

Jeep Transmissions: T-98, T-18, T-18A

Jeep Transmissions: T-176, T-177, T-178
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Unread 10-08-2010, 09:49 AM   #8
carnuck
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Seems everyone on here is too far away from me. My '82 J10 Honcho is getting the 360/T18A/NP208 pulled soon and hopefully sold. (6:1 first gear $500 for the works) I have a Rambler 290/AX-15/NP208 to put in so it'll be affordable as a daily driver for distances.
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Unread 10-08-2010, 10:14 AM   #9
jp360cj
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Quote:
Originally Posted by carnuck View Post
Seems everyone on here is too far away from me. My '82 J10 Honcho is getting the 360/T18A/NP208 pulled soon and hopefully sold. (6:1 first gear $500 for the works) I have a Rambler 290/AX-15/NP208 to put in so it'll be affordable as a daily driver for distances.
Not a good swap for a CJ. The input shaft would have to swapped, and the t-case adapted.
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Unread 10-08-2010, 10:29 AM   #10
carnuck
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Actually, it's a short input trans (they changed after '81 in the FSJs when they went to NP tcases) It's a Ford trans with a Jeep input shaft and bell on it. As for the Tcase, it would be better for a YJ swap as is, or a Dodge NP208 (I have one of those for sale too) with a Ford 31 spline input gear swapped in.
'81 up FSJ V8 T18s are Ford units
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Unread 10-08-2010, 10:31 AM   #11
SaddleTramp
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Treehugger has it right, the CJ T18 ended in the 1979 model year as did the Dana 20 transfer case. 1980 CJs came with Dana 300 so I world make sure of what the guy is really selling; maybe he has a 1979 set up and is confused about the year. The 1979 CJ T18 will have reverse over and up, prior to that they were over and down. The case also has a little different bulge on the side to compensate for the change. $300 is a great price in my neck of the woods.

Still this is an easy swap. Take a look at this:

Swapping a CJ T-18 into a CJ
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Unread 10-08-2010, 11:25 AM   #12
CSP
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Quote:
Originally Posted by SaddleTramp View Post
The 1979 CJ T18 will have reverse over and up, prior to that they were over and down.
You have this backwards. '78 and older is far right and up. '79 is far right and down.
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Unread 10-08-2010, 01:43 PM   #13
SaddleTramp
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Quote:
Originally Posted by CSP View Post
You have this backwards. '78 and older is far right and up. '79 is far right and down.
Oops, switched them. My 1977 CJ T18 is over and up.
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