Muncie 4 speed

[Paul K.]

The front slinger in the transmission is leaking, can anyone tell me how to repair or call for rebuild,

[Joe L.]

Re: Muncie 4 speed

Paul-----

Leaks from the front of a Muncie transmission are usually caused by one of the following:

1) leaking front bearing retainer gasket. This condition may be exacerbated by a plugged or partially plugged drain-back hole in the main case. Fix is to replace gasket and insure that the drain-back hole is clear (of gasket sealer, etc.);

2) leaks originating from worn front bearing retainer bolt holes in the main case. Fix is to Helicoil and seal the Helicoils with thread locker before installation;

3) leaks originating from the interface between the cluster gear shaft and the main case. Fix is to remove tranmission, disassemble and have the case bushed by someone experienced in this operation (e.g Ed Hartnett).

The above are the cause in about 99% of the leaks from the front of Muncie transmissions.

[Larry E. Howard]

Re: Muncie 4 speed

Paul,
If by the term slinger you are refering to the left hand thread nut used to hold the front bearing in place, alot of rebuilders mess up that nut and therefore the seal between the nut and the retainer. In some cases they even put the nut on backwards, the nut part goes to the bearing side and the smooth conical side goes outward, to seal aginst the matching surface of the retainer. If the flange on the nut has been chewed up by channel locks then damage is likely done to the reatainer too, Replace the nut and the front bearing retainer. You can do this youself, but pay attention the the items Joe mentions. To tighten a new nut use channel locks carefully with the tranny in reverse and another gear, which locks the input shaft from turning, tighten well then use a small file to remove the burrs made on the outer surface by the channel locks. Then use a punch to peen the nut where the small hole is on the input shaft. If your transmission has other problems such as growling in first gear or jumping out of gear then get a good rebuilder to go through it while you have it out of the car.
FYI the actual oil slinger is between the bearing and the input shaft gear on the inside of the tranny and I have never seen a bad one.

[Larry E. Howard]

Addendum

One other thing I should mention, there is nothing in the transmission to keep oil from running out the front of the tranny if the oil level gets above the center line of the input shaft. That is if it is overfilled, if you were to park on a steep incline, or even jack the rear end high for some reason. I have read lots of letters in the hot rod mags through the years about this problem. If you park on an incline make sure the nose is up, no matter what manual transmission you have.