Datsun Roadster Forum-311s.org

Since my motor is coming out I figure it’s time to put the correct speedo gear in. I’ve had this gear from mikeb for quite a while and after having another gear to compare it with I’m worried it’s more difficult than I had hoped.

Can anyone tell me what’s required to correct my speedo? I had a 3.7 rear end and have a 4.38 in there now.

The larger gear is the one I have, and I’m not sure which gear is the smaller one but the size difference worries me

Sorry I cant answer your question directly. I know the speedo drive gear color changes with the number of teeth. From Dean's site, "each tooth on a speedometer pinion gear represents 5 miles per hour. If the speedometer is running too high you need to get a gear with more teeth to slow it down.
If the speedometer is running too slow you need to get a gear with less teeth to speed it up".

Thanks to a forum member, I learned that the gear diameter increases with the number of teeth on the gear

check the techwiki

http://www.311s.org/pmwiki-311/pmwiki.p ... rannyGears

From my understanding the large orange one needs some kind of adapter which I was not able to locate. So mine sits on the bench, useless, and I estimate mph from my tach after driving along with a cell phone speedo app.

The wiki doesn’t show anything more than part numbers.

I asked Dean about it, and that's what he told me. I don't think there's a way to run it otherwise... and why I just do an educated guess by rpm and cell phone app!

The wiki does show two different sleeves, each for a certain range of teeth. Years ago when I installed my 4:62’s I bought the gear recommended by the dealer and put it in. It immediately mangled the teeth and I parked the car shortly after that, so I think that you do need to change sleeves if you stray to far from stock. I bought a used GPS from eBay for $15 that I now use for a speedometer and to track mileage. Someday I’d like to convert my stock speedo to GPS, but I’m guessing that’s pretty pricey!

Simon - Just saw your post...I sent you the carrier (or sleeve) that is the correct one to use for the orange speedo pinion. Use that and it will fit like a glove.

mikeb wrote: ↑Wed May 06, 2020 2:54 pm Simon - Just saw your post...I sent you the carrier (or sleeve) that is the correct one to use for the orange speedo pinion. Use that and it will fit like a glove.

Theres a sleeve in there too?! I didnt see it, but I also wasnt expecting to see anything else in there

mikeb wrote: ↑Wed May 06, 2020 2:54 pm Simon - Just saw your post...I sent you the carrier (or sleeve) that is the correct one to use for the orange speedo pinion. Use that and it will fit like a glove.

Well, if that's the case, where does one get this elusive sleeve!?

Gregs672000 wrote: ↑Wed May 06, 2020 3:16 pm

mikeb wrote: ↑Wed May 06, 2020 2:54 pm Simon - Just saw your post...I sent you the carrier (or sleeve) that is the correct one to use for the orange speedo pinion. Use that and it will fit like a glove.

Well, if that's the case, where does one get this elusive sleeve!?

and to piggyback on that, how difficult is it to install? Looks like at least part of the transmission needs to come apart

Simon,

I looked at the picture you posted and it looks like both pinions are already installed in the carriers. There's no disassembly of the transmission required. There's a hole in the passenger side of the transmission where the speedo pinion assembly slides into and engages a gear inside the transmission. The assembly is secured by a small tab and a short 6 mm bolt. The threaded portion of the carrier left exposed after installation
is where the speedometer cable is attached. I hope that helps.

Mike

Simon, can you post a pic of the sleeve when you get It please? Thanks!

Carrier/pinion sets are available from Nissan P/N 32702-58SXX - where xx is the number of teeth.

mraitch wrote: ↑Thu May 07, 2020 1:10 pm Carrier/pinion sets are available from Nissan P/N 32702-58SXX - where xx is the number of teeth.

The 5 speed one as well as the 16 tooth 4 speed ones are all gone from Nissan. You might be able to find a few 17 tooth ones that were for the early trucks but your speedo will be off. I know Dean sells the 5 speed ones and the 17 tooth one to use for the 4 speeds. I am looking to have new correct 16 tooth ones made for the 4 speeds.