Jump to content
SAU Community

Rb25 Gearbox Speedo Conversion For R32


32_Dave
 Share

Recommended Posts

We did this a few years back with my brothers car and its still working fine to this day. The VL gear is a smaller OD as you can see in the first pics and wouldn't mesh with the gear in the box, hence no speedo signal

Link to comment
Share on other sites

i used the same system for a cefiro with a 25 box worked perfectly, i used the navara speedo drive (32702-02G17) nissan part no. burnt the cog off, used the red gear on the speedo drive out of the r33 box. rounded out the middle of the cog, heated up the navara drive and tapped it on, super glued both ends. cut the slot for the locator and all good.

cheers heaps

Link to comment
Share on other sites

ive got a gtr one in mine atm but it reads like 10-20-30kph off (increases with speed)

is the navara/vl one accurate?

(it doesnt bother me too much having wrong speed as i can gauge off the revs-except in school zones.. dam 40kph have no idea what speed im doing)

Edited by Char
Link to comment
Share on other sites

I'll have a search for my post with the cog tooth count vs final drive ratios.. the 17T standard Navara cog is a pretty close match for my 3.9:1 diff gears (reads 7km/h high), you need the correct toothed cog to suit your diff gears.

Link to comment
Share on other sites

I'll have a search for my post with the cog tooth count vs final drive ratios.. the 17T standard Navara cog is a pretty close match for my 3.9:1 diff gears (reads 7km/h high), you need the correct toothed cog to suit your diff gears.

7km/hr at what speed?!? The amount that the speedo would be out would vary with speed...

Mine has a 4.3 ratio diff and is out by about 7km/h at 60km/h but 10km/h at 100km/h etc etc

Link to comment
Share on other sites

7km/hr at what speed?!? The amount that the speedo would be out would vary with speed...

Mine has a 4.3 ratio diff and is out by about 7km/h at 60km/h but 10km/h at 100km/h etc etc

@ 100km/h I'm actually doing 93km/h

Link to comment
Share on other sites

7km/hr at what speed?!? The amount that the speedo would be out would vary with speed...

Mine has a 4.3 ratio diff and is out by about 7km/h at 60km/h but 10km/h at 100km/h etc etc

i was actually wrong, at 72 speedo im doing 60 gps and 127 speedo 100 gps

in other words its miles out :thumbsup:

Link to comment
Share on other sites

  • 2 years later...
  • 4 months later...
  • 3 months later...
  • 9 months later...

just had a sensor shaft snap after this mod. the pics arent working can someone explain the 180degrees out for the locator pin for me? i didnt do any of that and maybe thats why it snaped. i just pressed the cog on and installed.

Link to comment
Share on other sites

  • 1 month later...
  • 3 years later...
  • 1 year later...

Did the conversion today and I took some pics as the original images are down.

KpiwlM6.jpg?1

Required parts.

MlLR3aq.jpg

What the drive looks like - note this one *came out* of the gearbox (didn't know what was in there). I didn't get any pics but I used a combo of a (n eventually plastic coated) cutting wheel, carbide cutter and a carbide burr on the dremel. You can see remnants of the removed black gear in the bottom right of the image. Recommend you melt it off instead, it'll be a lot quicker and less worried about damaging the spline on the shaft but messier.

What I didn't get was a picture of the flat I cut into the splined shaft. Cut 12mm down from the edge to match the new gear, or cut the flat from the gear. Either way works.

YiSyg9v.jpg

Note the gear shaft offset from the body. Also note the notch in the centre bottom, above thumb nail.

HusFz2g.jpg

Note the difference in gear size. The shaft housing needs to be rotated 180 degrees to make room for the bigger gear. The body will spin in the gearbox but you'll need to cut a new slot for the retainer.

hVFJWHD.jpg

Original retainer location in relation to notch.

wO8uIHr.jpg

*NEW* retainer location in relation to notch which needs to be made. It's mirrored around the notch. Approx 3.5mm deep x 20mm tall and 4mm away from the edge (from memory).

lbU8CH2.jpg

Cut it with three hacksaw cuts. Could use a dremel or a square file instead.

cXqxc3M.jpg

I didn't neaten it up at all as I had already cut a tiny bit too far.

4boLI07.jpg

New gear on. I applied a bit of araldite to the flat area just to be safe. Don't use superglue as I think it may melt the gear. Notice I started cutting the flat out of the gear, before realising I could cut the shaft instead (and would provide better location on the shaft, not that I imagine there's much force on it anyway).

VhAwXRL.jpg

Note, the gear doesn't bottom out on the housing like the black gear. Top of gear is flush with the shaft (as shown in an earlier photo).

vdexDX8.jpg

Going into the gearbox - if the gears are meshed, it should slide up to here with minimal effort. Note the location of the notch in the speedo drive body (should be pointing down).

CiTzJwk.jpg

All done!

 

 

 

  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share



×
×
  • Create New...