Are 9 bolt gear ratios stamped on the ring gear?
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Joined: Jan 2015
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Are 9 bolt gear ratios stamped on the ring gear?
Had another project going on but for whatever reason I felt compelled to pull this cover off and inspect.
I had assumed it was a 3.27. Did I get lucky? Is this a 3.70?
I had assumed it was a 3.27. Did I get lucky? Is this a 3.70?
Joined: Sep 2005
Posts: 27,895
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Are 9 bolt gear ratios stamped on the ring gear?
Hard to say. Probably not but definitely maybe. Most mfrs stamp the tooth count on them, if anything. 3.70 was 10:37. 3.27 was 11:36. Nearly all gear ratios have at least one prime number on one of the gears.
Thread Starter
Senior Member
Joined: Jan 2015
Posts: 565
Likes: 47
Re: Are 9 bolt gear ratios stamped on the ring gear?
Well that’s not what I wanted to hear. I was thinking my 10 bolt had the ratio stamped on the gear but my brain may have made that up.
I guess I’ll have to go do some counting.
I guess I’ll have to go do some counting.
Joined: Sep 2005
Posts: 27,895
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Are 9 bolt gear ratios stamped on the ring gear?
Hey, most of the time you're the bug, but once in awhile you get to be the windshield. 
Joined: Oct 2001
Posts: 12,219
Likes: 1,141
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Are 9 bolt gear ratios stamped on the ring gear?
Nice score, I have a set of BW 370 gears on the shelf for a future project.
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