rear differential specs needed.

[busa4]

hello all. i am replacing my ring and pinion and i cant seem to find any specs on setting up the dif. does anyone know what backlash (back and forth movement when holding pinion gear and moving ring gear) i should look for when setting up the ring gear on the pinion gear? i dont want to just look at the contact pattern. i will feel better about this installation when i get a good backlash measurement from my dial indicator....
thanks all.

[bigd7315]

.003 but white lithium grease works well

[RahX]

also good to check :

PINION BEARING AND DIFFERENTIAL BEARING PRELOAD

Pinion and Differential Case Bearing Preload;


New Bearings 3.4 - 6.2 Nm (30 - 55 lb. in.)

Used Bearings 2.8 - 5.1 Nm (25 - 45 lb. in.)

Pinion Bearing Preload;


New Bearings 1.7 - 3.4 Nm (15 - 30 lb. in.)

Used Bearings 1.1 - 2.3 Nm (10 - 20 lb. in.)

[busa4]

0.003" are u sure? that is pretty tight. i was thinking .010-.012"

[dmbrisket 51]

.003 to .005 for our trucks, its very tight new, im not sure on 'throw away' speck, but that is much looser then the 3-5 thou. you started with

[busa4]

i found the spec from a ring/pinion company i searched on google. spec for backlash on a 7.5" 7.625" ring gear for street use is .008-.012"
thanks all for your help guys...

[MT-2500]

Originally Posted by busa4

i found the spec from a ring/pinion company i searched on google. spec for backlash on a 7.5" 7.625" ring gear for street use is .008-.012"
thanks all for your help guys...

Here is a link that has so good info.
http://www.differentials.com/install.html
MT