23 replies to this topic

[kimbo]

So I had a Borgie done up with the shocking mounts moved in 10mm. Now it's in the car it almost looks as if the lower control arm mounts are not in the right spot. The diff points downward significantly to my eye. Any comments or observations welcome.  20240504_095410.jpg   77.79K   4 downloads  20240504_091134.jpg   65.11K   4 downloads  20240504_082633.jpg   52.86K   4 downloads  20240504_090020.jpg   75.69K   5 downloads

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[76lxhatch]

Measure it. Compare the pinion angle at ride height to the transmission angle and see what you have.

[kimbo]

Measure it. Compare the pinion angle at ride height to the transmission angle and see what you have.

A straight perpendicular line from the diff at ride height will be about 140 to 150mm lower than the transmission output shaft.

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[76lxhatch]

No, measure the angles of the pinion and the transmission. The difference in angle is the only thing that matters.

[neglectedtorana]

there is a Tremec app you can get and use your phone as an angle finder

think its called Tremec toolbox

[kimbo]

No, measure the angles of the pinion and the transmission. The difference in angle is the only thing that matters.

I get it that the angle is important when you are close. However based on the maths I did that 150mm equates to 6.8 degrees. What I am dealing with here is a diff that wasn't fabricated correctly. I have to work out my plan of action going forward.

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[kimbo]

there is a Tremec app you can get and use your phone as an angle finder
think its called Tremec toolbox

Unfortunately I need to have a driveshaft for that app to work. I don't want to order my driveshaft until I can get this roughly right.

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[76lxhatch]

It may or may not be right but you still haven't measured it yet. Forget about everything else, you need the difference in angle between the pinion and the transmission - if you have a digital angle finder, simply zero it on one end then take the reading from the other. You don't need a driveshaft in place to measure this, just compare the diff flange to the output shaft.

[kimbo]

It may or may not be right but you still haven't measured it yet. Forget about everything else, you need the difference in angle between the pinion and the transmission - if you have a digital angle finder, simply zero it on one end then take the reading from the other. You don't need a driveshaft in place to measure this, just compare the diff flange to the output shaft.

Yep ...7 degrees is the difference at anticipated ride height

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[kimbo]

The picture shows how I worked it out using straight edges and squares.  20240504_202856.jpg   49.57K   5 downloads

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[rexy]

Adjustable arms should give you what you need.

[RallyRed]

Worth putting the axles and wheels on and re measuring it at real world angle?  i.e. may be a little different.( better/worse)

 

p.s. I think you can get concentric bushes for this?  not sure, but they do something like this for track cars to keep the angle to a minimum. Helps uni joints last.

[kimbo]

Coming to the realisation that I might need a new diff. Pictures are left vs right  20240505_093922.jpg   65.46K   3 downloads  20240505_093908.jpg   60.37K   3 downloads

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[RallyRed]

Yikes!

[bat 53]

which butcher did that 

give it back to who done it and get them to fix it 

 

sorry but if people spend good money to get things done 

shoudn't have to except that 

[Shiney005]

Wow. Name and shame Kimbo.  I need to get one built in Perth soon.

[LJ RB30]

Ouch! That’s crap.

[neglectedtorana]

Have you checked your control arms are equal length, just in case they have worn over the last 45 years

[Heath]

So they haven't clocked the flanges to line up with each other on the diff housing. Is there any recourse available?

 

If you have adjustable arms, you should be able to put it together so that the pinion points the right way, but one of your brake calipers won't be clocked up exactly the same way as the other (not that anyone else will notice).

[Dr Terry]

So they haven't clocked the flanges to line up with each other on the diff housing. Is there any recourse available?

 

If you have adjustable arms, you should be able to put it together so that the pinion points the right way, but one of your brake calipers won't be clocked up exactly the same way as the other (not that anyone else will notice).

It's not just "not that anyone will notice it", it's also that the handbrake cable may or may not reach or sit properly.

 

Dr Terry

[kimbo]

It's not just "not that anyone will notice it", it's also that the handbrake cable may or may not reach or sit properly.

Dr Terry

I am going through the process of trying to get a new diff. I have also ordered McDonald Bros Lower trailing arms just in case. I will also know that the brakes are on the piss even if the hand brake works fine :-(

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[4dabush]

So they haven't clocked the flanges to line up with each other on the diff housing. Is there any recourse available?

 

If you have adjustable arms, you should be able to put it together so that the pinion points the right way, but one of your brake calipers won't be clocked up exactly the same way as the other (not that anyone else will notice).

And if they F…d that up, would you trust that the tubes are square to the pinion, or the welds are any good? I reckon Kimbo is on the right track trying to get recourse. 
 

Kimba, it’s the adjustable upper control arms you’ll need to adjust pinion angle. If you are buying lowers, you are half way there! 

[kimbo]

The update is that they are going to send me a new housing

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[LJ RB30]

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