360 From Standard Truck into Automatic Truck

[Golden Eagle]

I'm putting a 360 from a truck with a manual transmission into a truck with an automatic transmission. Besides changing the flywheel and flexplate, any other necessary parts or swaps? Thanks.

[FSJunkie]

The adapter plate maybee.

[RAMBLINFSJ]

Remember to knock the pilot bushing out of the end of the crankshaft. If you don't take it out, you won't be able to bolt up your torque converter to the flywheel.

[Dr. Marneaus]

I dont think so. I had my engine stripped down to just the crank at the back, and all I needed to put on to run the motor on a TH400 was the new flex plate/reinforcement ring, and the bushing that goes inside the crank. No adapters or anything like that.

Using the bushing would depend on what year the motor was from, and what automatic you're mating it to.

[Golden Eagle]

Originally Posted by RAMBLINFSJ

Remember to knock the pilot bushing out of the end of the crankshaft. If you don't take it out, you won't be able to bolt up your torque converter to the flywheel.

The bushing broke into several pieces when I split the replacement motor from the manual transmission.

The replacement motor is from a 1978 J-20. Will I need a new bushing for the auto trans?

[RAMBLINFSJ]

Originally Posted by Golden Eagle

The replacement motor is from a 1978 J-20. Will I need a new bushing for the auto trans?

What year Jeep is it going into? That will depend on if you need one or not. If is going in a Jeep with a 400t, yes. If it's a Torqueflite, no.

[Golden Eagle]

Originally Posted by RAMBLINFSJ

What year Jeep is it going into? That will depend on if you need one or not. If is going in a Jeep with a 400t, yes. If it's a Torqueflite, no.

It's going into a 79 with a TH400, so I guess that means I'll need one...? Is this an auto parts store part?

[azpackrat]

Find it here...

http://performanceamstyle.com/Cart/description.php?II=1068&sessid=5b20861c4f2997d170b 1ac3c2da3df61&divi=amc

[J20 project]

Ok, let's do a little history here......

66ish - 79 th400 auto....w/ crank bushing
80 and later torque command 727.. .no bushing.
these are not pilot bushings.....


recipient 79....
donor 79.....

donor motor,,pilot bushing,,,has nothing to do w/ the auto bushing...may need removed as Ramblin said...however OP says it fell out....no prob.

Bottom line is this,, it would behoove the OP to measure the crank hole and check if it is close to the diameter of the th400 trans torque convertor nose. If a few thousandths larger, then should be good to go.
If the hole is quite a bit bigger...more research as in ask someone who has a 727 compatible engine laying around and have him measure it..

Since it is a 79 engine going in...I would think it already has said bushing.
J20

[RAMBLINFSJ]

Also, while the engine is out, I would replace the front seal in the transmission.

[Dr. Marneaus]

Originally Posted by Golden Eagle

It's going into a 79 with a TH400, so I guess that means I'll need one...? Is this an auto parts store part?

If it is a TH400-era engine, getting mated to a TH400, then it should not need the crank bushing.

If it is a TF727 Era engine, getting mated to a TH400, it will need the bushing.


Example:

I swapped in a 1987 motor, which had a TF727, into my truck which was running a TH400. I needed to slip the lil bitty bushing into the crank to take up the gap around the TC snout.

Its a tiny ring, that weighs like 2 ounces...and it costs like 25 bucks shipped. silly.

[RAMBLINFSJ]

From my experience, the hole in the crank were all machined the same size. AMC cars during the same era as the 400 equiped Jeeps were running Torqueflites. It would make sense that AMC would make a spacer ring for the 400 instead of machining two different cranks.

[tgreese]

My understanding - If you're putting a 304/360/401 engine from a manual transmission FSJ into a TH400 equipped FSJ with the AMC pattern case (ie from '73-'79), then you need the thin bushing in the crank pocket. I expect that manual transmission V8 engines from that era will not have that bushing, regardless of their year.

[Golden Eagle]

As an update: The 360 from the T-18 manual truck had a brass pilot bushing and the 360 from the TH400 automatic had no bushing at all. I knocked the bushing out of the manual 360 and the two are now identical.

[J20 project]

From my experience, the hole in the crank were all machined the same size.

Except for mine which was never machined for a automatic transmission....only a manual trans pilot bushing hole..due to it being a crate motor from 1971.

Golden Eagle,,just in case you didn't catch on, 99.9% of all amc motors were machined for both manual and auto set ups. The larger auto hole is the one that most all of the folks here were talking about. It being larger on the 727 mated engines and having a thin metal(almost indistinguishable) bushing/ spacer in the large auto hole installed on the th400 applications.. As stated earlier, might be worth measuring the auto hole,,,good luck w/ your project.
J20 project

[Carnuck]

Originally Posted by Golden Eagle

As an update: The 360 from the T-18 manual truck had a brass pilot bushing and the 360 from the TH400 automatic had no bushing at all. I knocked the bushing out of the manual 360 and the two are now identical.

Ever see a speedi-sleeve for say, a harmonic balancer? That's how thin the TH400 pilot sleeve is. If the TH400 has an adapter ring between it and a Buick (Nailhead or BOP patterned) trans, then there is a crank adapter/centering pilot about 3/4" thick and the same diameter as the crank outer diameter with a pilot that goes into the crank. (my '73 J4000 and earlier ones had that setup and it uses a different flexplate than later ones too)
If the case is AMC patterned, it should have just the thin sleeve to align the th400 pilot in the crank. You CAN get a vibration without it (loosening the converter bolts and re-tightening them often makes it go away) and the flexplate is more prone to cracking too.

'71 also had a different crank flange with no centering lip to align a flywheel/flexplate.

[fulsizjeep]

I suggest putting the torque converter up against the back end of the crank and see how well the snout fits in the hole. If there is play there, it probably needs a bushing. It is a very thin walled bushing and a link to buy one has been posted in this thread. When I changed the T400 on Krista's 76 Wag in March, it did not have the bushing and accounted for a vibration we could never find the cause for... This very likely took out the tranny pump in our case. Wah-La