4.0 Motor swap - Pilot bushing/sleeve for auto trans? - JeepForum.com
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post #1 of 7 Old 12-02-2019, 02:56 PM Thread Starter
uhohthe50
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4.0 Motor swap - Pilot bushing/sleeve for auto trans?

I'm working on replacing the 4.0 in a 2005 wrangler with another 4.0. The new (but slightly used) motor is originally out of a 03 Grand Cherokee. I have the new motor ready to go in, however I noticed it does not have the same bushing that the old motor had on the crankshaft where the motor meets the trans.

There is a bushing/sleeve in the old block that has an inner diameter that matches up to the front hub on the torque converter. I think that bushing/sleeve is needed to align and hold some of the weight of the torque converter. Can anyone confirm that is the case? Or am I over thinking it? Are the 4 bolts that mount the torque converter to the flex plate enough? It doesn't seem correct not having the id of the bushing on the crank match the od of the hub on the torque converter. If I bolt the new motor up how it currently sits, the hub on the front of the torque converter will be about a half an inch smaller than the diameter of the hole on the end of the crank.

I've been searching all over the place for info about it but all I seem to come across are posts about pilot bearings for manuals. I can't seem to find a replacement bushing anywhere. Last night I tried renting a pilot bearing puller from autozone to get the old bushing out, however the bushing sits directly against the crank. There is no room to get behind it with the puller arms. I also tried the bread trick , but again, there really isn't a gap on the back side of the bushing for the bread to get behind it.

Has anyone else ran into this before? Any suggestions?


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post #2 of 7 Old 12-03-2019, 05:45 AM
hubbabubba
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I thought that only manual trannys needed the PB & the auto's didn't
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post #3 of 7 Old 12-03-2019, 07:02 AM Thread Starter
uhohthe50
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Here's a pic of the sleeve/busing that is in the crankshaft of the old motor I pulled out of the jeep.
https://www.jeepforum.com/forum/atta...875153&thumb=1

Here's the new motor with the flex plate installed on it. Notice it doesn't have the bushing in the end of the crankshaft.
https://www.jeepforum.com/forum/atta...875155&thumb=1

And here's what the nub looks like on the torque converter. Notice it is tapered a bit. The end of it is almost the same exact size as the id of the bushing (within .01") when I measure it.
https://www.jeepforum.com/forum/atta...875151&thumb=1
Attached Thumbnails
tc.jpg   old motor.jpg   new.jpg  

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post #4 of 7 Old 12-03-2019, 01:11 PM
Rubi4MyMrs
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It might work OK without it but I wouldn’t want to chance it. Besides supporting the converter (probably the most important thing) it will also help line up the converter when bolting it to the flex plate. You don’t want to end up with vibrations from the converter not being properly lined up & also it might cause excessive wear to the trans.

If you can’t get the sleeve (bushing) out of the old crank try finding a new one.

It looks like you need part # 04736204AA which shows as discontinued but I did see it may supersede to 04736483AA.

https://www.factorychryslerparts.com...ey_model=15533

Does not show a listing for item #7 (usually means discontinued) which is the sleeve for automatics but if you put 04736204AA into the search function you get

https://www.factorychryslerparts.com...4736204AA.html

Then look down in the also bought you see “BEARING, SLEEVE. Crank Shaft Pilot, Pilot. Automatic Transmission” which takes you to


https://www.factorychryslerparts.com...4736483AA.html

Which says here “Part Number: 04736483AA
Supersession(s):04736204AB; 4736483AA”


I would do some further checking to see if 04736483AA works or even do more searching with the 04736204AA number.
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post #5 of 7 Old 12-03-2019, 01:38 PM Thread Starter
uhohthe50
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Quote:
Originally Posted by Rubi4MyMrs View Post
It might work OK without it but I wouldn’t want to chance it. Besides supporting the converter (probably the most important thing) it will also help line up the converter when bolting it to the flex plate. You don’t want to end up with vibrations from the converter not being properly lined up & also it might cause excessive wear to the trans.

If you can’t get the sleeve (bushing) out of the old crank try finding a new one.

It looks like you need part # 04736204AA which shows as discontinued but I did see it may supersede to 04736483AA.

https://www.factorychryslerparts.com...ey_model=15533

Does not show a listing for item #7 (usually means discontinued) which is the sleeve for automatics but if you put 04736204AA into the search function you get

https://www.factorychryslerparts.com...4736204AA.html

Then look down in the also bought you see “BEARING, SLEEVE. Crank Shaft Pilot, Pilot. Automatic Transmission” which takes you to


https://www.factorychryslerparts.com...4736483AA.html

Which says here “Part Number: 04736483AA
Supersession(s):04736204AB; 4736483AA”


I would do some further checking to see if 04736483AA works or even do more searching with the 04736204AA number.

I was thinking the same thing that I didn't want to chance it.

I appreciate the info, you got further than I could in searching for it. 04736204AA definitely looks to be the part. That sucks it's been discontinued though. At least I have a part number to go off of now.

04736483AA does look just like the sleeve thats in the motor. I wish they had dimensions for it so I could tell if it is for sure the same size. I'm going to keep searching around to see if I can find some dimensions for it or if I happen to get lucky and find someone with the original part (04736204AA). Thanks again!

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post #6 of 7 Old 12-03-2019, 01:55 PM
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Here is a link I found when searching. It is from 2013 & a national search did not find one part back then. He claimed to have one machined from the manual trans pilot bearing.(?) Also may have had converter issues without the sleeve.

https://www.jeepforum.com/forum/f9/n...nions-1480737/
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post #7 of 7 Old 12-04-2019, 10:40 AM
Red Rubicon
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Have you tried a transmission shop? They should either have one or have a source to get one.
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