InTheZone
Active Member
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how many shims did you apply to each spider gear?
I'm in the process of building and shimming my BP diff for the first time. I bought extra shims for the area between the housing and bearings and I have that sorted. Very minimal bearing play and outdrive play, any more shims and it may start to bind.
Now while putting together the spider gears I have the blocks the sit on the outside in the correct orientation (flat part against diff housing, smooth/slightly rounded side facing the center of the housing), but I noticed some play between the spider gears or between the blocks or the blocks and the housing.
With one pair of spider gears resting in the diff housing I apply pressure with a screwdriver to the center indentation and take another flathead screwdriver and see if I can gently pry and twist the gaps to check clearances. I have 5 shims on each side so far with enough gap for maybe one more shim on each side, but I don't want to bind it. The reason I apply pressure down the center is to keep the spider gears from rising as I add more shims, and trying to prevent issues when installing the rest of the spider gears. On a stock setup the big bevel gear that sits on the diff outdrive sits flush at the top of the housing when you have all spider and bevel gears installed (ring is off to see the internals). With a diff that has around 5 shims per spider gear the larger bevel gear sits flush at the top of the housing (when the diff is standing up) so I know I didn't add too many shims where the spider gears were binding on each other.
So, is it necessary to add these shims to the spider gear or should I just use one shim per gear? I definitely don't have enough spider gear shims to do more than 1 diff so if it's recommended then I'll need to order more. Thanks
edit: As I just posted this I was thinking about the large washers that rest over the o-ring (between case/ring gear and the large bevel gear) and I believe adding one there would create the same effect that when sandwiched it will push the spider gears towards the outside without needing to add several shims to each spider. Is this thinking correct?
I'm in the process of building and shimming my BP diff for the first time. I bought extra shims for the area between the housing and bearings and I have that sorted. Very minimal bearing play and outdrive play, any more shims and it may start to bind.
Now while putting together the spider gears I have the blocks the sit on the outside in the correct orientation (flat part against diff housing, smooth/slightly rounded side facing the center of the housing), but I noticed some play between the spider gears or between the blocks or the blocks and the housing.
With one pair of spider gears resting in the diff housing I apply pressure with a screwdriver to the center indentation and take another flathead screwdriver and see if I can gently pry and twist the gaps to check clearances. I have 5 shims on each side so far with enough gap for maybe one more shim on each side, but I don't want to bind it. The reason I apply pressure down the center is to keep the spider gears from rising as I add more shims, and trying to prevent issues when installing the rest of the spider gears. On a stock setup the big bevel gear that sits on the diff outdrive sits flush at the top of the housing when you have all spider and bevel gears installed (ring is off to see the internals). With a diff that has around 5 shims per spider gear the larger bevel gear sits flush at the top of the housing (when the diff is standing up) so I know I didn't add too many shims where the spider gears were binding on each other.
So, is it necessary to add these shims to the spider gear or should I just use one shim per gear? I definitely don't have enough spider gear shims to do more than 1 diff so if it's recommended then I'll need to order more. Thanks
edit: As I just posted this I was thinking about the large washers that rest over the o-ring (between case/ring gear and the large bevel gear) and I believe adding one there would create the same effect that when sandwiched it will push the spider gears towards the outside without needing to add several shims to each spider. Is this thinking correct?