HUP Halfshaft Failure: Anyone have a spare available?
 

Afternoon all,

A friend's HUP lost rear drive on Sunday while out for a gentle run.
No drama, no "bang", just failed.

As we suspected, investigation has shown the long halfshaft failed at the start of the splines.

It appears to have been a progressive crack that finally failed.

We now are looking for a replacement.

Does anyone have a spare for sale?

Or does anyone know where else the HUP axle was used in GM's small truck range? As that may give us a lead to a spare.

Many thanks
John

Old threads might help
 

Hi John

As the saying goes been there had that happen, got the T-shirt. Over the years I've broken both rear axles on my HUP. First time, probably 20 years ago, I got lucky and somebody had a spare. But even then they were scarce as hens teeth.

When the other side snapped I when the route of having one made. It worked very well found a race car and performance out fit that gave me really good service. Will look for that old MLU thread.

Hear is a more recent thread about having new shafts made

http://www.mapleleafup.net/forums/sh...xle#post242291

Hope this helps.

Cheers Phil

Thanks Phil,

We did suspect that might be the answer.

But we were wondering what other vehicles the axle was used with, as seemed unlikely for GM to design a complete one-off for the HUP

Hi

If it did fit anything else would probably been a C15A. I don't have a parts book for those so can't check the part number. But the HUP rear axles part numbers are Right 5807334 Left 5807333.

As GM making special parts, while Ford and GM did use common parts from prewar vehicles but I don't remember any with off set differencials.

Cheers Phil

John,

Don't know if it helps, but I believe Jonathan Moore had new ones made for his C8A.

Alex

That's the earlier thread
 

Hi Alex

That's the link I reference in the earlier post. As Jonathan thread was newer and his source was closer to John who is looking.

Cheers Phil

Spline size/number....
 

Hi Phil

Did you not also have an issue with finding the correct almost unique HUP spline design for your axle shaft????

On the other hand I do have a spare long and short axle for a HUP.... not sure of the spline pattern........ wish it was not so expansive to ship across the pond or the other side of the world.

Cheers

HUP Halfshafts
 

I have contacted the same company that Jonathon Moore used, and asked for a price for another pair.

Depending on the quote, we may get several sets made as unit cost should be lower.

Will keep MLU posted

Thanks

Sorry Phil, missed that :o

John,

I think you need to team up with Jonathan & Phil in having new ones made.

But, as a very long shot, if you send me the dimensions of the shaft I can check a recently acquired stock of spares.

Hanno

Thanks Hanno,

The broken shaft is some distance away, but I will see if I can get the dimensions to you

Same here John, even basic lenght and diameter would help to ID the one or two in stock (of which I suspect are for C15A).

Hanno

HUP Halfshaft Dimensions
 

Hi Hanno,

Measured an unbroken halfshaft today:

Diameter = 1.5" (37.6mm)
Length [up to the face of the flange]: 40.75" (1034mm)

Flange diameter: 5.25" (133mm)
Flange thickness: 0.46" (12mm)

Thanks
John

Hi John, Ι have my Halfshafts out of the axles at the time, so can make any measurements for you.

If you decide to go for new made ones, I'm ready to order one set.

Kostas

John,

Will be checked this weekend, stay tuned (but don't hold your breath as it is a long shot).

Regards,
Hanno

Thanks Hanno