grind ring teeth to fit locker?

svtbronco2 · Mar 31, 2008

i gotta 7.5" rearend in a 94 mazda 2wd. i bought this richmond lockright from this guy on this site and he showd me pictures of how he had to grind teeth off of his ring gear to fit the crosspin in? other people are telling me that you only have to do this if you have a gear ratio bigger than 3:73...is this correct? i have 3:46's am i cool? b/c i would rather not grind of teeth..lol

97BlackBetty · Mar 31, 2008

You should be able to slip the cross pin in just fine. Now get to working on the truck and lock it up. :icon_cheers:

Wicked_Sludge · Apr 1, 2008

you can also purchase a modified cross pin for ratios larger than 3.73.

DangerRanger · Apr 1, 2008

Offset pins not recommended with lockrite.

Use the grinder and keep the tooth pattern off of where you ground

AllanD · Apr 1, 2008

It is critical to properly align the ring gear to the diff housing.

There is one point where the ring gear will align almost perfectly to allow
the gap between the teeth to let the cross shaft pass.

On a 3.73 you can SOMETIMES get a full diameter pin to fit without any grinding
of the inboard tips of the teeth, with 4.10's you must ALWAYS grind.

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Hahnsb2 · Apr 1, 2008

Wicked_Sludge said:
you can also purchase a modified cross pin for ratios larger than 3.73.

They will not work with a locker, the pin must be able to be fully removed from the carrier.

alaskan155 · Apr 1, 2008

just out of curiosity, does the 8.8 31 spline have the same problem with the cross pin, in gear a high as 3.55, just curious been thinking about getting a lock-right for the winter for my f150

4x4junkie · Apr 1, 2008

alaskan155 said:
just out of curiosity, does the 8.8 31 spline have the same problem with the cross pin, in gear a high as 3.55, just curious been thinking about getting a lock-right for the winter for my f150

Yes, but with 4.56 & numerically higher ratios.

chico4554 · Apr 1, 2008

i put a no-slip in my 8.8 28 spline without grinding the teeth. I had 3.73s

DieselTech07 · Apr 3, 2008

hi I have a similar question. I have a 1997 ranger with the 7.5" axle with factory 4.10 gears. and I have been thinking about installing a lockright, I have seen posts on this site which said that you need to grind the ring gear with the 4.10 ratio. I saw somebody in this thread said that the offset crosspins are not recommended with the lockright.
my questions are, could I use the factory crosspin with the lockright and how much would I need to grind the ring gear. Thank you

Hahnsb2 · Apr 3, 2008

DieselTech07 said:
hi I have a similar question. I have a 1997 ranger with the 7.5" axle with factory 4.10 gears. and I have been thinking about installing a lockright, I have seen posts on this site which said that you need to grind the ring gear with the 4.10 ratio. I saw somebody in this thread said that the offset crosspins are not recommended with the lockright.
my questions are, could I use the factory crosspin with the lockright and how much would I need to grind the ring gear. Thank you

Yes you can use the factory crosspin, the ring gear doesn't need too much grinding, mine took about 10 minutes with a dremel and a sandpaper bit, probably less than 1/16th of an inch.

TireIron · Apr 3, 2008

ok this should help everyone...

7.5 with 4.10s
before grinding

after grinding

so you can see how little actually has to be ground off the edge of the teeth. an 8.8 with 4.56s would look about the same as this. the very corner edge just has to be ground down a hair so the pin can just slip past it.

Also the factory will have a notched crosspin in the 7.5 with 4.10s but the lock-right should come with a new solid pin.

metalmacguyver · Apr 3, 2008

And to any one that does grind the gears, make sure to be as meticulous as possible about cleanup. you dont want that grinderdust in your gears and bearings.....

DieselTech07 · Apr 6, 2008

Thanks everyone

pillen140 · Apr 6, 2008

DieselTech07 said:
hi I have a similar question. I have a 1997 ranger with the 7.5" axle with factory 4.10 gears. and I have been thinking about installing a lockright, I have seen posts on this site which said that you need to grind the ring gear with the 4.10 ratio. I saw somebody in this thread said that the offset crosspins are not recommended with the lockright.
my questions are, could I use the factory crosspin with the lockright and how much would I need to grind the ring gear. Thank you

svtbronco2 said:
i gotta 7.5" rearend in a 94 mazda 2wd. i bought this richmond lockright from this guy on this site and he showd me pictures of how he had to grind teeth off of his ring gear to fit the crosspin in? other people are telling me that you only have to do this if you have a gear ratio bigger than 3:73...is this correct? i have 3:46's am i cool? b/c i would rather not grind of teeth..lol

im the one that bought the gears from the same guy, skipped on the lock right(no $$$). they were 4.10's and it looked like they were ground about 1/8 to 1/4 maybe less, im no good at measurements.

it doesnt look like it was too hard to grind off part of the tooth, and it will not effect the ring gear. it is so little it in no way will affect the strength of the gear at all. im glad i bought them already grinded, so when i have the cash for a lockright, i wont have to do it!

grind ring teeth to fit locker?

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Yeah, I built that.

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