Rb25 Gearbox Into R32

[=premo=]

I've got a 2 way diff and I'd want the backlash set right so I'd have to get my diff man to set it up but I'm trying to find out which ratio is going to be best for drift with my new engine or if I should just leave it how it is.

Thanks guys

[Simon-S14]

4.1 for you mate.

a 4.3 will just rev out too quick with the power and torque you have, you'll be able to stay in a gear for longer with the 4.1

[=premo=]

so would a 3.9 be better so I have more time to play with the throttle?

stock gts-t is 4.1 isn't it?

[Simon-S14]

stock gtst is 4.3, which i have and ive got no probs with holding 3rd or 4th with that, i i had even more torque again (like what you have planned) i would change my diff to a 4.1

3.9 isnt really needed, bugger all difference between a 4.1 and a 3.9 anyway and 3.9's are a lot harder to come by.

[=premo=]

So where can I source a 4.1 to put on my 2way?

Just get a second hand crown wheel from an R33 gts-t or will I need the pinion as well?

Cheers

Edited January 20, 2008 by =premo=

[Simon-S14]

crownwheel and pinions are always matched sets.

just grab a SR s13 diff, they are 4.1

[bubba]

Conversion was successful today, took many hours a bit of swearing, welding, tapping, grunting. Most annoying part was that the rear section of my tailshaft was 17mm too short!! wtf?! will be taking that back to be rectified during the week.

280kmh dash is sweet and my guesstimations for 3.9 diff + 17T Navara cog were correct, speedo reads high by 10kmh

[=premo=]

Any pics of your cross member etc?

I still havent finished my engine so havent put the 33 box in yet. Will do a write up once I have.

[bubba]

Nope, I'll try to remember to take some next time it's on the hoist.

Basically got some flatbar, cut 2 pieces, marked the holes, drilled them, bolted it up to the car with the flatbar in between, tac'd it, took it off and welded it.

[Cubes]

Nope, I'll try to remember to take some next time it's on the hoist.

Basically got some flatbar, cut 2 pieces, marked the holes, drilled them, bolted it up to the car with the flatbar in between, tac'd it, took it off and welded it.

wow complicated.

I slide the gearbox rubber mount towards the front of the car so that the middle hole in the std xmember lined up with the rear chassis holes. Then simply drill new holes in the gearbox so you can bolt the gearbox to the rubber mount.

I then bought a $2 piece of 4mm plate, drilled 3 holes, bolted the front chassis hole up to the plate directly then the xmember's middle hole bolts through the bar in to the chassis. The xmembers rear hole requires a nut with a little locktight.

Slap a little sound deadening spray crap so it matches the rest of the floor pan and its extremely difficult to pick.

I'll grab some pics soon.

[Shaun]

Hey, i posted a question last week about my geabox getting stuck in reverse. The cause of it was that the speedo sender shaft actually snapped and left the nylon gear (and half the shaft) in the gearbox.

Ive got an R33 box in an R32 and have done the Navara sender and standard r33 gear swap.

My question is: How do i ensure that this doesnt happen again? When i installed the navara sender originally, i didnt notice that the shaft was off centre. Has this got something to do with it. Do i have to rotate the sender in the gearbox to a particular position?

I ordered the navara sender for $50 and the R33 nylon gear for $60 from Hornsby Nissan today.

Thanks,

Shaun.

[=premo=]

When you put the nivara drive in did you rotate it 180 degree's and re-slot it?

[bubba]

wow complicated.

I slide the gearbox rubber mount towards the front of the car so that the middle hole in the std xmember lined up with the rear chassis holes. Then simply drill new holes in the gearbox so you can bolt the gearbox to the rubber mount.

I then bought a $2 piece of 4mm plate, drilled 3 holes, bolted the front chassis hole up to the plate directly then the xmember's middle hole bolts through the bar in to the chassis. The xmembers rear hole requires a nut with a little locktight.

Slap a little sound deadening spray crap so it matches the rest of the floor pan and its extremely difficult to pick.

I'll grab some pics soon.

That sounds more complicated than my way we had a 32gtst w/26 in the shop so just copied that setup but with thicker flat

When you put the nivara drive in did you rotate it 180 degree's and re-slot it?

Nope, my impression was that was for 23T (bigger gear) so it doesn't push as hard against the pinion. My mechanic has been running a standard 17T Navara sender in his 25 box for years with no problems.

Edit: I'm more worried about the funky bends in the brand new speedo cable

Edited February 11, 2008 by bubba

[Shaun]

When you put the nivara drive in did you rotate it 180 degree's and re-slot it?

No i didnt. Why do you do this? Is it so that the larger gear doesnt push as hard on the gear in the box?

I can only assume that the shaft snapped because there was too much lateral force on it. Or it was wabbling around in there.

I suppose another alternative is to just use the Navara gear and have the speedo recalibrated (or live with it).

Thanks,

Shaun.

[bubba]

Mate, so your speedo doesn't work? that explains the steering going heavy after a few mins.

[Shaun]

Mate, so your speedo doesn't work? that explains the steering going heavy after a few mins.

No, No, it only just stopped working. The sender must have only just snapped. The speedo worked ok but i still had no power steering.

Shaun.

[Cubes]

If you don't mesh the gears together correctly they will smash them selves to pieces.

This is why the sender clearly is off center. So you can use different gears and adjust accordingly.

[bubba]

It's just like setting up the spur gear on your r/c car

[Shaun]

It's just like setting up the spur gear on your r/c car

^^^I dont understand what that means at all!

Anyway, i did the mod last night and put the sender with the new gear into the box in the new position (180 degrees rotated). When i turn the main shaft in the gearbox, the speedo sender rotates, so i can only assume it worked ok. Fingers crossed. The tutorial from Cubes was soooo handy; thanks mate. I didnt bother about using a circlip on the end of the shaft though. It was an extremely tight tolerance fit, so i dont think it will work its way off. What do you guys reckon?

Shaun.

[=premo=]

Hmmm, could work its way off, might be tight fit now but on a warm day travling along the freeway at 110 km/h gearbox gets hot. But I'm lazy so I'd probably do the same