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setting 14bff backlash?

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pismorat

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I just got my DIY4X diff cover and am about to put it on; I pulled the old one off and saw some metal in the bottom of the diff. The gears look worn, but not horribly. I put a locker in it a few years back and set the backlash, but now I forgot how to check it and adjust it. Can anyone give me a run-down of what I need to do to check/adjust it?
 
get a mag base and dial indicator to check the BL.
Adjust if needed buy turning the spanners on hte sides of the carrier......loosen the caps first.
 
I set my used set .008-.012 and it has worked so far and when I painted them it came out right I run right around .009.

I also have a detroit and at the wheel it acts like it has a lot of backlash in it but the gears are pretty tight.

Ira
 
.006 is the magic number for setting up new gears. They can be up to .010 and be ok.
 
shane74 said:
.006 is the magic number for setting up new gears. They can be up to .010 and be ok.
Click to expand...
Bringing back an old thread. Is .012 too much for backlash in the 14BFF?
 
TM 9-2320-289-34​




6-15. REAR AXLE DIFFERENTIAL MAINTENANCE (ALL EXCEPT M1009) (Con’t).​




NOTE​


At this point, side bearings are preloaded. If any additional adjustments
are required, ensure that preload remains as established. If 1 adjusting nut
(8) is loosened, the other must be tightened an equal amount to maintain
this preload.
8. Mount dial indicator (22) on housing
and measure backlash between ring
gear (4) and drive pinion gear. Rock
ring gear back and forth to measure
backlash. Backlash should be
between 0.003-0.012 in. (0.076-
0.305 mm) with
0.005-0.008 in.
preferred,
(0.1 27-0.203 mm)
NOTE
If adjusting nut
(8) requires
adjustment, bolts (2 and 5) must
be loosened. Once final
adjustments have been made,
bolts must be retightened to
proper torque.
9 . If backlash is more than 0.012 in.
(0.305 mm), loosen right adjusting
nut (8) 1 slot and tighten left adjusting
nut 1 slot. If backlash is less than
0.003 in. (0.076 mm), loosen left
adjusting nut 1 slot and tighten right
adjusting nut 1 slot. Remove dial
indicator (22) from housing.
NOTE
If ring gear (4) and drive pinion were replaced, perform steps 10-13 to
check for proper gear tooth contact pattern.
10. Wipe any lubricant from housing and clean each tooth of ring gear (4).
11. Using a medium stiff brush, sparingly apply prussian blue dye to all ring gear (4) teeth. Area of
drive pinion tooth contact should be visible when drive pinion is engaged by hand.
NOTE
Excessive turning of ring gear (4) is not recommended. Ring gear should
be turned only enough to provide tooth contact pattern,
12. Apply load until it takes a torque of 40-50Ib.-ft, (54-68 N.m) to turn drive pinion.turn
companion flange so that ring gear (4) turns
1 full revolution, then reverse so that ring gear turns 1 rev in opposite direction​



1 3 . Contact pattern should be centrally located up and down on the face of the ring gear (4) teeth.​


Compare tooth contact pattern on ring gear with examples shown and make adjustments as
indicated.
NOTE
Ensure that differential cover and magnet are clean.
14. Carefully position vent tube bracket, brake line and bracket, and proportioning valve lever at
housing. DO NOT kink lines. Install new differential cover gasket and differential cover with 14
bolts. Tighten bolts to 35 Ib.-ft. (47 N.m).
FOLLOW-ON TASKS:​


•​


Install rear axle shafts. (See TM 9-2320-289-20) • Fill rear axle differential with lubricating oil. (See LO 9-2320-289-12)​


TA50589​


6-103​


 
BIGBLAZE433 said:
Bringing back an old thread. Is .012 too much for backlash in the 14BFF?
Click to expand...

If the gears are used that might be an OK number, however if they are new you should try to get the BL a little lower to have the strongest set-up.
 
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