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  #1  
Old 01-01-2020, 01:07 PM
Mtnmax Mtnmax is offline
230 Tornado
 
Join Date: Aug 16, 2017
Location: Colorado
Posts: 6
1979 Cherokee Auto Tranny to T18 Manual Tranny swap questions

Hello to All and Happy New Year!

I have a 1979 Cherokee that I'm thinking of swapping out the TH400 auto tranny for a T18 manual with a mounted Dana 20 and bellhousing that I have on hand. My current setup has a Dana 20 Transfer Case bolted to a TH400. I don't think it's original. I do think somewhere along the line, someone yanked-out the Quadra-Trac and installed the Dana 20 instead.

Anyway, my question is, what do I need to do this swap? I know I need the clutch pedal assembly, clutch and assorted linkage, but what else? And can I use my automatic steering colum, or do I need to swap that out for a manual one as well?

Does anyone have a clutch pedal assembly lying around that they would be willing to part with? Maybe a steering colum as well? My T18/Dana 20 combo are both missing their shift levers, so l would need those too.

Thank you!

Max
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Old 01-01-2020, 02:58 PM
joe joe is offline
 
Join Date: Apr 28, 2000
Location: PNWet, USA
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Couple things come to mind.
The input shaft length of the T18 will have to match the AMC motor. Short shaft if the trans came from behind the 258. Long input shaft if it came from a 360/401. Obviously you'll also need the correct depth bellhousing/spacer. You also have to have the correct bull gear on the D20. Though same tooth counts, the gear if the D20 came from behind a TH400 has a different tooth pitch than the one from mounted behind the T-18.
Novak's should/probably still sell the D20 bull gear?
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Old 01-01-2020, 04:33 PM
Mtnmax Mtnmax is offline
230 Tornado
 
Join Date: Aug 16, 2017
Location: Colorado
Posts: 6
I haven't measured the input shaft on the T18, but to my eye, it looks fairly long. How long should it be for a 401? Also, the T18 that I have already has a Dana 20 mounted to it, so there shouldn't be any issues with that.

Thanks.
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  #4  
Old 01-01-2020, 05:50 PM
joe joe is offline
 
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I don't remember exactly. It's been years since I've messed with a T18 but for use with a 360/401 it's just a bit over 10". I think 10.125" or maybe 10.250" The one for the 258 I-6 IIRC is about 4" shorter?
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Old 01-02-2020, 12:04 PM
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tgreese tgreese is offline
 
Join Date: May 29, 2003
Location: Medford MA USA
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All the FSJ V8 manual transmissions have absurdly long input shafts and adapters like this:



The aluminum part in the foreground is the adapter. This is clearly a Jeep T-18, as shown by the bolt spacing on the front of the case on this side.

There is no difference in T-18 between a 304 or a 360 or a 401, though they all use different flywheels (balanced differently) and the 401/T-18 was one year only, 1974.

The T-18 for a 258 has an adapter plate that's about 5/8" thick, with a commensurately shorter input shaft. Same bell housing for all manual transmissions, 1972-79. The '71 flat-flange 258s and V8s are different, as are the '80 and up J20s with a T-18.

Without the long adapter and input shaft, you need to move the shifter stalk under the dash, or the V8 will interfere with the firewall. It is possible to heat and bend the stalk into a dogleg to clear the dash, thus allowing the swap to a Ford T-18 (shortest of all) or the Jeep short input T-18. Note that Jeep T-18s from CJs were close ratio for several years, with a 4.02:1 1st, not the 6.32:1 1st usually seen.
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Last edited by tgreese : 01-02-2020 at 12:14 PM.
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Old 01-04-2020, 06:09 AM
threepiece threepiece is offline
350 Buick
 
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Although rare, brake pedal geometry from a non power brake FSJ is different than the power brake FSJ. I Am not sure how using one will affect performance.

There is also differences in the bellcrank and possibly control rods for the clutch. I think the trucks use a different setup than the Cherokee to account for the increase in body mounting height.

Cherokees with a T18 had modified transmission tunnel covers. The modification was a cutout to the original cover and a fiberglass molded insert put in place. This provided clearance for the much taller T18. If you use a body lift you may not have clearance issue.
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Last edited by threepiece : 01-04-2020 at 06:21 AM.
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  #7  
Old 01-04-2020, 09:12 AM
Mtnmax Mtnmax is offline
230 Tornado
 
Join Date: Aug 16, 2017
Location: Colorado
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I didn't think about the flywheel. And I have read before that the flywheels are specif to the 401 versus the 360 or 304. I would need a flywheel as well if anyone has one they're not using... The list of needed parts continues to grow.

I don't currently have a body lift, but that is a possibility in the future.

Thanks for all the input so far!
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  #8  
Old 01-04-2020, 11:06 AM
joe joe is offline
 
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The 401 w/manual trans from the factory was/is extremely rare in FSJ's. For finding a used 401 flywheel or leads to a new one you'll prolly have better luck on an AMC/Rambler/AMX forum.
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Old 01-04-2020, 11:37 AM
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babywag babywag is offline
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Google lists several sellers for a 401 flywheel PN 3212655

https://www.google.com/search?q=jeep+3212655
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  #10  
Old 01-07-2020, 09:18 AM
Mtnmax Mtnmax is offline
230 Tornado
 
Join Date: Aug 16, 2017
Location: Colorado
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Thank you for the lead on the flywheel!

What about the steering column? Any ideas? Do I need to swap for a manual? Or will an automatic column work?

Thanks!
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  #11  
Old 01-07-2020, 11:41 PM
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dbabicky dbabicky is offline
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Location: Wisconsin
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You can use your auto column. That's what I am doing for my J-10 any way. I just removed the auto shift lever.
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