6 replies to this topic

[Stedz_lc]

Hi guys
Where exactly should the pinion be in relation to the tunnel and transmission
I have one in lc and it's way to far to the passenger side by eye, looks almost like a tail shaft would hit the floor
It's a borgwarners in lc Torana
Any info be great

[Bigfella237]

I don't know the measurements for a Borg Warner but with a 9", if the pinion is centred the left axle will always be 4" shorter than the right, or if the axles are both the same length, the pinion will be offset 2" to the right, and the space between the axles will always be 1.125"

 

 Axels.jpg   45.05K   4 downloads

 

Are your axles equal length?

 

Did you have the conversion done yourself?

 

Is it possible whoever did the conversion got the left & right measurement screwed up?

 

[76lxhatch]

As long as it doesn't actually hit and the uni angles are OK I wouldn't worry about it, not many are actually completely centred when you start looking closely

[Stedz_lc]

Ok, what's the uni angles meant to be,
The diff was done by someone else when I tubbed the car I gave them over all length I need and have it in the car so the wheels are central to the tubs the pinion is miles to te passenger skde

[N/A-PWR]

Hello Ed,

 

here is one explanation:-

 

 

http://jniolon.clubf...inephasing.html

 

the same goes with the tailshaft going sideways.

[Bigfella237]

Assuming the tailshaft doesn't physically hit the tunnel under the full range of suspension movement and/or diff torque, the next thing you really need to do is accurately measure all the driveline angles?

 

The diff pinion should be roughly parallel with the gearbox output shaft on both planes (looking vertically and horizontally), and the angle of any uni joint should be kept to a maximum of:

 

 U-joint angles.JPG   24.69K   4 downloads

 

But a uni joint should always work through some angle, never zero.

 

For the table above, 4th gear in most manual gearboxes is straight-through (1:1) so in 4th the shaft speed is the same as engine RPM. To figure out shaft speed for any other gear, just divide engine RPM by the gear ratio, so if 1st gear is 2.54:1 then 5000 RPM divided by 2.54 equals a shaft speed of 1968.5 RPM.

 

But generally speaking, you want to keep the operating angle around 2 to 3°

 

If your operating angles are greater than that, you could use a two-piece driveshaft to split the difference, otherwise send the diff back and get it re-done?

[N/A-PWR]

Great info Andrew.