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1) Pinion is two deep, this is defined by the thin sharp line at the bottom of the tooth.
2) BL is on the looser end, on a performance diff you want 6-8.
I'd reduce the pinion depth by 0.008" , and tighten up the BL and run some more patterns with a LOT of force on the gears. You also want to mix gear oil in your pattern paint to help get better patterns.
1) Pinion is two deep, this is defined by the thin sharp line at the bottom of the tooth.
I'd reduce the pinion depth by 0.008" , and tighten up the BL and run some more patterns with a LOT of force on the gears. You also want to mix gear oil in your pattern paint to help get better patterns.
What gears are you installing?
will not install new gears. Only the seals and bearings will be replaced (except the pinion gear... I will leave that alone).
I will not install new gears.
Only the seals and bearings will be replaced (except the pinion gear... I will leave that alone).
How do you reduce the pinion depth?
Okay please clarify what you're doing:
1) Setting up a new set of gears
2) Putting new bearings on an old set of gears
If you're running a pattern on an old set of gears, it's irrelevant and you don't need to make any changes. Change your carrier bearings and make sure you put the shims back exactly as they were and the BL matches the previous setup . If you don't know how to make changes to pinion depth, then you don't need to be make any changes to pinion depth...
1) Setting up a new set of gears
2) Putting new bearings on an old set of gears
If you're running a pattern on an old set of gears, it's irrelevant and you don't need to make any changes. Change your carrier bearings and make sure you put the shims back exactly as they were and the BL matches the previous setup . If you don't know how to make changes to pinion depth, then you don't need to be make any changes to pinion depth...
2) I'm putting new bearings on an old set of gears.
2) I'm putting new bearings on an old set of gears.
There's no reason to run a pattern. When you change carrier bearings you need to take the BL before, and match it after. It should be the same or close if you put the carrier shims in the same place.
Sorry for the late comment. Been very busy with my students today and yesterday.
I thought GTR1999 replied on my thread, but the reply disappeared...
- Yes, I bought new axles. GTR asked for the measurements of the axles, which I gave.The new axles weren't perfect (as GTR replied in a previous post). But I think they will do the job (will not race the car). Future will tell...
- Yes, it are still the original gears from 1977.
Do you guys know how I can remove the old races and bearings that are installed on both sides of the posi. unit? It is best to replace them, when the unit is out the case?
Removing those bearings is a real pain. It requires a press and the correct bearing remover tool. Not sure I would do it with the gear on. You can not afford even one chip on those gear teeth. And you already have it all clean and assembled. Still a PITA for a first timer like me.
So why did this come apart? Leaky seal? Just do that.
Spritz the bearings with some light oil and see if they spin smoothly. Clean and examine closely and look for wear marks, pitting etc. Did they make noise?
If they pass those tests I am not sure I would mess with them.
Your choice.
BTW your diff currently looks very clean, and dry. Too clean to install actually. I would reload those clutch discs and soak them in diff oil as they go in. Or they will make noise for a long time.
Removing those bearings is a real pain. It requires a press and the correct bearing remover tool. Not sure I would do it with the gear on. You can not afford even one chip on those gear teeth. And you already have it all clean and assembled. Still a PITA for a first timer like me.
So why did this come apart? Leaky seal? Just do that.
Spritz the bearings with some light oil and see if they spin smoothly. Clean and examine closely and look for wear marks, pitting etc. Did they make noise?
If they pass those tests I am not sure I would mess with them.
Your choice.
BTW your diff currently looks very clean, and dry. Too clean to install actually. I would reload those clutch discs and soak them in diff oil as they go in. Or they will make noise for a long time.
I have a press at home. What the correct tool to remove them?
One of these. Be sure to get a good quality one - it takes a LOT of force to remove the race from the carrier and there is not a lot of contact area between the puller and the race.
Save your old races, and you can dremel them to a loose fit, cut off the needle bearings, and then use them as a press tool to put the new bearings on without damaging them.
Save your old races, and you can dremel them to a loose fit, cut off the needle bearings, and then use them as a press tool to put the new bearings on without damaging them.
Ditto…. I have a milk crate full of the old inners of various bearings I’ve replaced over the years. More than once they have come in handy.
Backlash + ring gear pattern (2nd try)
