Differential Ring Gear Diameter?

[Nicholas R]

Does anyone know the diameter of the differential ring gear in the DeLorean transmission? I've been running some torque/hp numbers through the transmission with a guy at work but one key element that I dont have is the dimensions of the differential. I know the ratio is 3.77:1 but thats it. I really wish I would have measured while I had the transmission apart.

Does anyone know this information or have a transmission apart enough that they can measure it?

For reference, this is what I need the diameter of:


Thanks a lot!

[David T]

You should also have the number of teeth on the pinion and the crown wheel. If you are going to calculate the #'s at the wheels you also have to know the wheel's true diameter.
David Teitelbaum

[Nicholas R]

Already have those. Luckily I have good photos of each from when they were apart. 32 teeth on the ring gear, 9 on the pinion. Also I was wrong, we dont have the 3.77:1 ring gear, we (supposidly) have the 3.44:1. Still, the math for 32 teeth and 9 doesn't really work out. Simply put, 32/9=3.55 so maybe the ratio isn't exactly 3.44:1?

Either way, still looking for the diameter. There's a torque relationship I want to work out.

EDIT:
After doing more research, the DeLorean differential (assuming it's the 3.44:1) should only have 31 teeth not 32. The photo I'm counting from is from the back side but I still definitely count 32 teeth indications. Kind of odd.

[jawn101]

Nicholas, I don't know if this will help but here's a more "dead-on" shot of my differential. I don't have the measurements you're after unfortunately.

[dmc6960]

If there are 32 teeth, then wouldn't there only be 31 depressions for the 9 teeth on the pinion to sink into?

[DMCMW Dave]

185 mm +/-

[Nicholas R]

If there are 32 teeth, then wouldn't there only be 31 depressions for the 9 teeth on the pinion to sink into?

No because it's a ring, not a rack. There's no extra tooth like on the edge of a rack, there has to be the same number. Still puzzling. The documentation even says it should be 31x9 but I definitely count 32.

185 mm +/-

Thanks Dave! Hmmm... not as big as I was hoping for. I was hoping for at LEAST 8".