STRANGE 12 bolt housing VS GEARS
 

I have a new 12 bolt housing from STRANGE.

I was going to change the gears and I have a set of RICHMOND gears.

The pinion gear on the new RICHMOND is 3/16 shorter than the gear we took out of the car.

The new gear will not fit.

Any idea what gives here.

I thought all series 4, 12 bolt, gears were the same?

Thanks!

Re: STRANGE 12 bolt housing VS GEARS
 

The pinion gear is 3/16" shorter where?

Which ratio?

Are both gear sets Richmond?

The same series?

Re: STRANGE 12 bolt housing VS GEARS
 

I've never seen any 12 bolt gears where the pinion was shorter in depth, which is what I take it you're referring to?

Post a pic of the new and old pinion side by side.

Re: STRANGE 12 bolt housing VS GEARS
 

does the ring gear work?
i'm betting you have got a set for something other than a 12 bolt.
pete

Re: STRANGE 12 bolt housing VS GEARS
 

could it be a BOP gear set???

Re: STRANGE 12 bolt housing VS GEARS
 

Have a strange 12 bolt in our stocker,never any problems with any brand gears, you probably have wrong gears.12 bolt truck or BOP stuff.

Re: STRANGE 12 bolt housing VS GEARS
 

Richmond gear set got any numbers on it ?????

Re: STRANGE 12 bolt housing VS GEARS
 

After looking at it I see the pinion will not pass through the bearing in the case.
new one has the bearing on it.

Re: STRANGE 12 bolt housing VS GEARS
 

it appears that you simply have the wrong gear set. Maybe boxed wrong or looked up wrong number.

Re: STRANGE 12 bolt housing VS GEARS
 

If we had the number it could easily be solved...we can see the packaging in your image. ;)

Is this it? https://www.summitracing.com/parts/r...27-1/overview/

Re: STRANGE 12 bolt housing VS GEARS
 

If you think you have a problem just measure from the area that the front pinion bearing mounts to the end of the spline.....

Measure the bearing mount diameters of the front and rear pinion bearing..

Does the companion flange fit the new gear set???????????

Just looking at the pix it just appears that difference is the length of the gear teeth on the pinion caused by a ratio change.....

Just my 2 cents....

Bob

Re: STRANGE 12 bolt housing VS GEARS
 

The one on the right is a 12-Bolt Pinion gear.
I spent quality time with mine, doing my first ever ring and pinion swap from scratch, and I recognize that in an instant.
I have no idea what the one on the left is.

Re: STRANGE 12 bolt housing VS GEARS
 

He stated the new gear was on the right...maybe he has a S60 housing???

Re: STRANGE 12 bolt housing VS GEARS
 

That gear on the left has a smaller rear pinion bearing, it probably is a truck gearset. The 12 bolt truck had a diamond shape cover and a smaller bearing. Looks like the wrong part to me.

Re: STRANGE 12 bolt housing VS GEARS
 

Weary of guessing without a part number. :rolleyes:

Re: STRANGE 12 bolt housing VS GEARS
 

I missed that part.
At this point, I would be looking for any numbers on the housing and the original gear set.

Is this in the '69 Camaro in your sig?

Have you contacted Strange?

Re: STRANGE 12 bolt housing VS GEARS
 

If it is truck gear rear pinion bearing( next to teeth) is about .125'' smaller and bearing sets about .080'' closer to teeth(pinion is deeper in housing).
Mike Taylor 3601

Re: STRANGE 12 bolt housing VS GEARS
 

NEW RICHMOND NUMBER IS 79-0029-1

The gear that came with the housing ( the one without the bearing) is a US GEAR 4.88 Set up and installed by Strange Eng.

I have 5 other sets of 12 bolt gears and all of them look the same as the Richmond.
None of them will pass through the bearing in the housing.

Re: STRANGE 12 bolt housing VS GEARS
 

Have you tried looking up the numbers on the US Gear on their website to see which gear set it is?

Re: STRANGE 12 bolt housing VS GEARS
 

I think i got it, we had to polish the pinion now it seems to be working.
Please excuse my ignorance
Thanks for all the replies!!

Re: STRANGE 12 bolt housing VS GEARS
 

You should use a press to install and remove the inner pinion bearing.

You do need to polish the shaft for the outer pinion bearing, but only enough so that it slips on and off, with a little bit of force.

Are you going to use a crush sleeve or spacer to set the preload?

Re: STRANGE 12 bolt housing VS GEARS
 

Using the spacer

Re: STRANGE 12 bolt housing VS GEARS
 

Sometimes with a new part,you have to do a few things. That's how you gain experience. It was a good thing to ask before you damaged something else, in this case, you found it and we all learned something. Thank you for sharing the probable solution with the rest of us.

Re: STRANGE 12 bolt housing VS GEARS
 

Hi,

If you polish the front pinion inner race mounting area be careful....

If you make it an easy slip fit, sometimes the inner race will spin on the pinion shaft and destroy your pinion depth shims.....

Give me a call at 650 922 0407 I have some tricks that you can use....

Bob

Re: STRANGE 12 bolt housing VS GEARS
 

truck 12 bolt gears maybe?

Re: STRANGE 12 bolt housing VS GEARS
 

The Richmond gear is longer than the US Gear. The one on the left is Richmond and the one on the right is US Gear. If I have a choice I would go with the US gear. Looks stronger. http://i111.photobucket.com/albums/n...psp1sdoulg.jpg

Re: STRANGE 12 bolt housing VS GEARS
 

One day,decades ago when we both had more hair,I was building a 12 bolt for Tony Janes' Chevelle.He had a brand new out of the box Richmond ring and pinion and a brand new spool.We couldn't get the ring gear on that spool at room temperature for anything. There was an interference fit that was exaggerated by the new parts. I got the wild idea to put the ring gear in the dishwasher, and the spool in the freezer, then we took off for Mexican food at Maria's in Glendora. An hour and a half later, we returned, the ring gear was too hot to touch, so we placed it in the middle of a shop rag on the bench, then the spool came out of the freezer with frost on it.I used some grade 8 3/8 SAE bolts of various lengths to draw the ring onto the spool, and it all went together real nicely.I got all 12 bolts in and started before the frost melted off the spool, so we torqued the final ring gear bolts and finished setting up the rear end. All parts had equalized in temperature quite nicely and we never had an issue with that rear end later.