3 speed manual trans problem

Bigfoot21075 · Post by **Bigfoot21075** » March 15, 2010, 7:20 am

Hi Everyone,

I have a 1965 F100 with a 240 and a 3 speed manual trans. The trans leaks like crazy from the rear seal where the drive shaft goes in.

Is that seal separate from the bearing or is it one piece bearing and seal? If it is separate I would think I should also change the bearing as well (along with the u-Joints since I have to take the drive shaft off anyway).

How hard is the bearing and or seal to replace with the trans in the truck. Would I use a piece of PVC pipe and the outer bearing race to tap in place?

Any tips are GREATLY appreciated!

f100jim · Post by **f100jim** » March 15, 2010, 7:40 am

The seal is separate. There is a bushing right in front of the seal. The bearing is located between the tailshaft housing and main case and could be pressed on the shaft. I've had them come off easy and not so easy. With the driveshaft in,how sloppy is it in the tailshaft housing?

Bigfoot21075 · Post by **Bigfoot21075** » March 15, 2010, 7:56 am

I do not feel any real play, I was just changing the bearing because I was going to have the shat out any way - but if that is not a good idea then i will leave it alone....

f100jim · Post by **f100jim** » March 15, 2010, 12:54 pm

Bigfoot,was the trans making noise? Does the speedo work ? If trans is quiet and the speedo is alright and the driveshaft fits snug in the tailshaft housing bushing(not too much up & down motion), I'd slap a driveshaft yoke seal in the rear and let it be. I had one whiring when I would let out on the cluch in neutral, bad imput shaft bearing ... Like I said sometimes those bearings come right off, sometimes they're a pistol and you have to drop the gears inside the case to the bottom,remove the shift rails and shifting forks, separate the main shaft which means the needle bearings fall out in the case. What I'm getting at is..IF IT AINT BROKE DON'T FIX IT jim

Bigfoot21075 · Post by **Bigfoot21075** » March 15, 2010, 12:58 pm

f100jim wrote:Bigfoot,was the trans making noise? Does the speedo work ? If trans is quiet and the speedo is alright and the driveshaft fits snug in the tailshaft housing bushing(not too much up & down motion), I'd slap a driveshaft yoke seal in the rear and let it be. jim

THANKS JIM!

Yes, it is tight, everything works and it is quiet. I think you saved me some work Jim - THANKS AGAIN!

Rob