superliner with 3406

[Jeremy_Brault]

hi, I am looking at an 87 superliner that needs a motor, has mack motor in it now but was looking for a winter project and would like to make it a lowboy truck. Did mack ever offer the 3406 cat engine with a mack tranny behind it? I know you could get a truck with a 3406, but am having troubles finding a bellhousing to fit it with a mack tranny. any help would be great thanks.

[Superdog]

I've seen 3406's with Mack 12 speeds.There's a Superliner in WI for sale on Truckpaper that has a 12 speed behind a 8V92

[oilburner]

Yea they did come out with mack trannys, a buddy of mine has one that came factory with a 3406 and a mack 9 speed. The trany went bad and they swaped it out for a eaton 13 double over, it is a 86 model. One question i would like to ask, once a guy told me that a mack had a little diffrent pilot bearing than a eaton trans used, somthing about a lock ring or a snap ring in them that would put pressure on the crank if you did not remove the snap ring when you put a eaton in were a mack trans had been, are there any truth to this or was the guy just blowing.

[theakerstwo]

If the mack truck has a mack trans and you are going to use it then the bellhousing on the trans is same using a mack or cat engine.

[Jeremy_Brault]

yea the bellhousing is the same but i guess i meant the flywheel housing is what i was wondering

[Jeremy_Brault]

i switch an eaton 9 speed to a eaton 13 speed and then switched to a t 2090 9 speed last winter and did not encounter any pilot bearing problems when we did it. i would say that the guy was fibbing u

Edited December 29, 2012 by Jeremy_Brault

[oilburner]

i switch an eaton 9 speed to a eaton 13 speed and then switched to a t 2090 9 speed last winter and did not encounter any pilot bearing problems when we did it. i would say that the guy was fibbing u

Well i kind of thougth that, but he said it would all go togehter but something about the thing haveing a sna ring in it or something, i don't know for sure but i took it that he was trying to say that the pilot bearing had a snap ring in the end of it and when you but the eaton trans in it would ut pressure on the crank thrust and could cause problems, i guess he thought the eaton pilot shaft was a little longer, i had never herd of it before. Thanks..

[maint1]

Just happened to see this thread. Was working on a 3406 with wiped out thrust washers this week, had an Eaton, the new washers would not go in, unless I loosened the bell housing bolts. Pulled engine out to see why not enough crank end play. Found out that someone had put a new clutch in it, and had put on the snap ring on the pilot bearing like a Mack Tranny uses, removed snap ring and tapped pilot bearing into flywheel, put engine back in and had the proper crank end play. The input shaft was pushin the flywheel foward because of the snap ring. All good now, putting liners in, but thought it might help somebody else. Was scratching my head for about 3 hours.