New 4.6L stroker build

[SilverXJ]

Not hung, the transmission is flush with the block/aluminum plate.

[dwg86]

Your Jeep had an aluminum plate between the trans and engine? I don't remember seeing that with automatics, only manual trans.

[dwg86]

Ok this is a stupid question, and I know you probably looked, but did you make sure there isn't a pilot bushing in the end of the crank?

[SilverXJ]

Yes, there is an aluminum on the automatic transmissions too. It covers several large holes in the bell housing that would otherwise be there without it. No pilot bushing. I did compare the stock 4.0L crank with the 4.2L crank and couldn't find any differences in the flex plate mounting flange or end hole that would make any difference.

[YJason]

X2 on the Aluminum plate with a auto trans. The pilot diameters are on a 4.2 is similar to a 4.0 crank. IIRC the 4.2 had a bushing in it to match the AW4 torque converter pin dia. where the 4.0 crank didn't.

[SilverXJ]

Bushing? What bushing? I didn't notice a bushing when I was examining the crank, maybe it is needed?

[YJason]

IIRC there is a thin walled bushing in the end of the 4.2 crank. I should get my engine back this week sometime and I will double check and get some pics and demensions for you. I remember something about it because I almost pulled it out when I remove the bearing and remember using my digital calipers on it. The ID is .010-.015 larger than the pilot pin on the torque converter.

I can't imagine that being your noise, being that it makes a difference wheteher the engine is hot or cold when it does it.

[SilverXJ]

Unless it is used to center the converter.

[the_wrench116]

this would be very interesting to pin down finally as i'm sure that this could be why the clutch guys don't have this particular racket in there motors. ill buy the guy that fixes silvers problem a beer as long as ya take paypal.

[dwg86]

this would be very interesting to pin down finally as i'm sure that this could be why the clutch guys don't have this particular racket in there motors. ill buy the guy that fixes silvers problem a beer as long as ya take paypal.

OK, I'm motivated to find the bushing part number now!

[YJason]

I got my engine back today, so as promised here are the pics

Bushing



Bushing ID



Bushing OD? (probably 1.032)



TC Pin OD



Crank large bore OD




TC pin flange OD (or whatever you want to call it)

[SilverXJ]

Are you sure that isn't the pilot bushing for a manual transmission? IIRC the 4.0L and 4.2L crank have the same measurement in that area.

[YJason]

I pulled the needle brg cage out of the bushing.

[SilverXJ]

If it had needle bearings it was meant for something to rotate in it, such as a manual transmission input shaft pilot.

[YJason]

If it had needle bearings it was meant for something to rotate in it, such as a manual transmission input shaft pilot.

Yes, it had a BA-10 behind it. Thats what made me start mic'ing diameters, I wanted to make sure my auto would go behind it. I thought there was a reason the diameters were so close so I just left the bushing in there.

BTW: My 4.2 crank is from a YJ.