my freshly rebuilt rear end whines like crazy, and when you let off the gas its makes a banging/grinding sound..........sooo what the problem, is there not enough play in it or what

 

Sounds like it wasn't set up correctly. Could be the pinion depth, bearing preload, backlash or all of the above. You better park it until it is fixed. It might already be too late. The gears might already be ruined if it's making that much noise.

Setting up a set of gears is a precision job. The pinion depth and backlash must be set to within +/- .001 inch of nominal. Bearing preload needs to be within 3 inch pounds of nominal. If it is off much more than this it will cause problems.

 

hell with it, i allready spent 700 on it, might as well spend 800 more to take it to someone else

whats is concidered nominal???

 

nominal is the depth that its supposed to be set at, its etched into the gear.

i would take it back to the same person and make them fix it, free. or get a refund.

 

where at on the gear and is there a "gear jargon" that i will have to decode

and yea im going to talk to the the guy see what he says

 

sounds like whoever did the rebuild did not get the pinion
nut tight -takes quite a bit of torque on that nut to
squeeze the crush sleeve that is between the pinion
bearings(the sleeve is there to prevent the bearings
from spinning on the pinion shaft)-if the pinion bearings
are too loose the pinion can rock in the housing causing
improper gear mesh-damage to pinion bearings or gears
is possible.Jack up and support the car,get under and try
to move the pinion shaft up+down-if it moves bearings
are too loose,drain and take cover off axle,take driveshaft
off,jam gears with something,and using a cheater pipe
on breaker bar or 1/2 drive ratchet carefully tighten nut
in small increments until pinion does not move up+
down but still turns freely.Reassemble and test.
when apart check gears for damage and check for
loose bolts(check the bolt for the spider pin too-if that
comes out will ruin the day!) who knows what could be
hokey with the "rebuild".

 

i will look at that later tonight or monday when i get off work

 

Some gears are marked and some are not. The contact pattern should be used as the final word on pinion depth. Set up the pinion, set the backlash and check the pattern on the ring gear teeth. Read the pattern and make adjustments to correct the pattern. Adjustments as small as .002 can make a difference in the performance of the gears.

Setting the backlash requires the use of a dial indicator like this.

Setting the pinion bearing preload requires a preload gauge to measure resistance to rotation, like this.

 

yea im taking it somewhere else.............if i had the tools id do it myself, o well might as well spend some more $$$$, already spent alot with all the other stuff

 

ok me and the guy who rebuilt it are going to go get under it and tighten it up, it is lose, how do i stop the pinion

i seen jam the gears with something, but to be this would cause damage to the gears.............but anyway where is a good place to jam it.

i hope i get lucky and get ahold of a drive on lift so i i can just chock the front tires and then tighten it

 

english please

what are you doing? if you have to stop the gears, put a wrench on one of the carrier bolts. If you are tightening the pinion nut, just hold the pinion and use an impact gun.

 

a rear end guy told me not to use an impact that the hammering can mess up the bearing and or the crush sleeve.......he told me to get a cheater bar on it and to find a way to stop the tires from turning.... someone on here posted to jam something in the gears

but yes its the pinion thats lose and needs to be tightened up more

 

BUMP

 

The right way to do this is to remove the axles and differntial so that you can check the pinion bearing preload. There is no way to do this with the differential still in the rear end. You must know how tight the bearings are so that you can set it right. The pinion bearings need about 15 to 20 inch pounds of preload, which means that is how much torque it takes to turn the pinion, not how much torque is on the nut. Measure bearing preload like this.

It can take as much as 300 foot pounds of torque to crush a new spacer, so get a cheater bar and a strong breaker bar. You can use a large pipe wrench to hold the yoke, or make a tool out of 2X2X1/4 angle iron to bolt to the yoke. Use red Loktite on the nut. They sometimes back off and cause more problems.

 

just curious but what would happen if you over tightened the pinion nut?

 

would depend on how overtightened the pinon nut was
and how the axle was used-bearings would probably
eventually fail-either from overheating if used at high
speeds,fatigue pits developing on bearing rollers and
races and or bearings spinning on pinion shaft.

 

everything is brand new, but i got someone with a dial indicator and a preload gauge thingy working on it