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If you have replaced warn bits (bearings, diff copper shims and fibre washers, dog clutches), assembled parts in the correct orientation, torqued crush tube correctly, and spline sets and teeth are minimally worn then there should be no more backlash than 'normal'.Quote:
Originally Posted by Jazzman
Can you clarify the bit about fitting the PTO drive?
How was the housing slightly different?
Hard to tell from videos, but front shaft seems to have more play than the rear drive shaft.
Because the input shaft has a PTO drive connect to it, there is more space required at the back, basically the input shaft was longer. The gears all lined up correctly and there was an alloy spacer for the housing. Without this housing spacer it would not have been possible to shim the input bearing.
Yes I agree the front shaft seems to have more play than the rear. Interesting also the gap between the input gear and the interment gear is slightly greater than the gap between the intermediate gear and the output shaft gear. I've checked in housing for intermediate shaft hole wear and there isn't any, the hole is still round on both ends.
After going away on the weekend to Mt Skene and then doing Burgoynes Track. My front diff appears to have finally given up the ghost. I believe the backlash may have been from the front diff the whole time.
Now it is whining when I back off the throttle, which it was not doing previously. I took another video today i'll post it shortly.
Front diff backlash vs rear. This was in neutral with the hand brake off. I had just rolled the car backwards to find the grease nipple to grease the uni's thinking it might have been them.
Front diff worn - YouTube
I'd be doing both, but front definitely, most likely spider gears
The rear has recently been rebuilt with an Ashcroft ATB but using the crown wheel and pinion from the original diff as they were OK. Interesting you say this as the backlash was set for a front diff to make it a little tighter.Quote:
Originally Posted by discorevy
I think from here the plan is to rebuild the front and see how we go. The ball joints and CV's are also 390,000kms old so who knows what I'm about to find.
Yeah , with those Kay's there might be a fair bit of spline, CV , hub wear as well, I imagine a lot weren't easy Kay's either[wink11], excuse for a front atb/ locker?
You are not wrong. I've got it all back together with my spare front final drive (diff centre) fitted, new seals and ball joints. I've taken some pictures of the process, there is one of the spline wear. Something I did notice on the axle is the dust cover / seal runner must be cleaned exceptionally well before reassembly, if not the new seal will be damaged very quickly. I went to town on mine with a wire brush on the end of an electric drill. I hope that is enough as I've heard many have had issues with them leaking.Quote:
Originally Posted by discorevy
I couldn't work out how to check the CV's, I didn't disassemble the half shaft from the hub which might have had something to do with it. I would have cut the boot off if I had a replacement one.
If I didn't have a spare diff I would have brought an ATB for it. The conversion rate is great at the moment, I even checked the Ashcroft website for the front axle and CV upgrade kit but they were out of stock.
Here are some pictures of what was found when I pulled apart the front end.
Attachment 128294Attachment 128295Attachment 128296Attachment 128297Attachment 128298Attachment 128299Attachment 128300
This is a video of what the prop shafts were doing once the diff was replaced. The back last is still there as it was before the diff was broken, i guess it is moderately better but it is still there. Obviously not as bad as it was with a broken cross pin in the front diff.
This front diff is noisy but it is working, i'm going to need to pull it out again at some point to replace it with a better one. When I do I'll have the diff backlash checked, replace the axles and CV's. I'l get the rear backlash check at the same time.
I think the backlash may have contributed to damaging this diff, but to be fair I did have a bit of front wheel lift the day before it got real bad.
After diff replacement - YouTube - Prop shaft movement after diff replacement
