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Author Topic:   ford rearend question
killermiller
Dirt Roller

Total posts: 24
posted May 14, 2002 09:46 AM
How full does the rearend need to be of gear oil? I filled it till it was at the filler neck which is about 3/4 up on the pumpkin but now it leaks out of the rear end vent hole on the axle tube. Can I just plug the vent hole or should I not fill it so much? Thanks

uforacing51
Dirt Freak

Total posts: 349
posted May 14, 2002 01:20 PM
You can run a length of rubber hose on the vent tube, then add the vent on at the end of the rubber hose again, and that will stop most of the leaking out of the vent, but you will end up with alot of the lube in the axle tube. I ran a 9 inch in a mod on 3\8 mile tracks and didn't ever need to run more than the amount it held up to the filler, I never burned up the pinion bearing, just make sure its full every week. If you run bigger tracks, make sure that the seals are really good and add the tube to the vent and overfill the pumpkin a little and you should be ok. If you do run the big tracks consider an inner axle seal to keep the lube in the pumpkin. I had never ran a 1\2 mile track until I ran Rapid City, I didn't have the inner axle seal, and after 2 nights of racing the pinion bearing went. very expensive mistake.

BGA
Dirt Roller

Total posts: 16
posted May 14, 2002 03:59 PM
I agree.Use the axel seal.We burned up 3 pinions before we figured it out. Also I dont know if having all the extra fluid in there actually helps or does it rob some power, like if you over fill the crank case. Would the same principle apply with the rear end?
BGA

uforacing51
Dirt Freak

Total posts: 349
posted May 14, 2002 05:50 PM
like a friend always says, "the car manufacturer spent alot of money to make sure the stock piece works well for most applications". Sound thinking, it does rob a bit of the horsepower, but its cheaper than burning it down.

o5racer
Dirt Maniac

Total posts: 115
posted May 14, 2002 10:17 PM
how many quarts does a stock nine inch hold? the one under my street stock had no fill plug when i put it under there. the housing had the plug on the original third member, and the third member that went in it had the plug on its original housing. is 2 1/2 enough or does it take more?

uforacing51
Dirt Freak

Total posts: 349
posted May 15, 2002 01:32 PM
Drill a hole in the pumpkin about 2/3 of the way up the pumpkin and tap it with a tap and die, then just fill the rear end till it starts coming out of your new filler and put the plug in. (make sure you clean all the shavings out.) BTW 2 and a half sounds about right

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