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  1. 70Hardtop

    8.75 SureGrip , Is this Normal?

    I just saw your nasty reply from 2 years ago (a reply you made three years after the last post! Anyone who comes along three years later to post such unwarranted vindictive remarks on a PUBLIC forum is a sad and miserable loser indeed. In fact I'm surprised that a moderator didn't remove it...
  2. 70Hardtop

    727 Torque Converter Recommendations??

    No probs...thanks for reply anyway
  3. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    I just did some reading on the Torque to yield bolts. Very interesting. And I'm glad you mentioned it, as now I know about it and have learnt a bit more. However, as another fellow here said, and I don't mean to knock your post, but it is not relevant in our ol' skool world, unless we used...
  4. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    Good story and I'd say that has happened more than once around the world, maybe even more than twice... A good reason to replace them if you didn't know the previous history of the unit. You did well to get that LH tap, ebay can be a saviour sometimes.
  5. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    Ah ok. But what bolts on the engine are TTY then? The service manual doesn't say to replace the head bolts but it says to replace the ring gear bolts. BTW, what exactly does torque to yield mean? Is that at the limit of a bolt's stretch? I thought torquing bolts is meant to prevent a bolt...
  6. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    haha, that reminds me of a funny situation when I was removing them, happened to be about 2am and cold and I wasn't fully alert. Yes I knew they were LH thread, so I was undoing them with a ratchet and every time the ratchet eased up to finger tight I pulled it off and started undoing with my...
  7. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    Thanks for advice - but I cannot work out what TTY is? Something to do with torque values? Are head bolts and main cap bolts TTY? As I said in another reply, in Aust I will have to pay between $56 (OEM) and $76(ARP) for them. So not exactly cheap.
  8. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    Yeah, it's easy to get ripped on the shipping. I have bought a few things for my Mopars from Canada and shipping wasn't too bad at the time (sellers helped out). Re the bolts - I just priced some, Doctor Diff has some for A$54 (incl shipping cost by First Class) and there are some ARP ones...
  9. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    thanks for reply, I think I will, yes it is, well not really cheap, as I have to get them imported in but it is easy insurance. And good point about the Loctite and dealerships etc, hadn't thought of that. In my case however, there was no thread locker on them and I was helping the guy that...
  10. 70Hardtop

    727 Torque Converter Recommendations??

    Sounds like you have some worthwhile experience with TC, I dont!... So I was wondering what you think about Coan TCs? As I have a new one ready but not yet installed. Thanks
  11. 70Hardtop

    Is it necessary to replace the crown wheel bolts on 8-3/4 ?

    We say crown wheel, Americans say drive gear (or ring gear) and the service manual says to discard the old bolts when it is removed/replaced for service or ratio change or rebuild etc. Also I see there are many kits online with the new set of bolts. So I am wondering how much stress do these...
  12. 70Hardtop

    741 - crush sleeve and shims?

    Yes I was thinking about the backlash adjustment - I have a dial indicator and the factory service manual. I have less than 70 inch pounds full assembled (as I said, we got about 60 or less) so looks like this is ok then, should be even less when full of oil. BTW This forum is great, really...
  13. 70Hardtop

    741 - crush sleeve and shims?

    "By crown bolts, I assume your talking about ring gear bolts? When they came in the bearing kit I would use them. Other wise I have reused used ring gear bolts many many times without an issue. There are only two different types to watch for , non shouldered and shouldered bolts. just use the...
  14. 70Hardtop

    741 - crush sleeve and shims?

    Thanks for the offer Roy. I have not even pulled the main part (crown wheel bit) off yet. So I have not seen what spacers or shims are in it. We only just got to check out the turning torque of the carrier fully assembled. With the small click style torque wrench, we came up with approx...
  15. 70Hardtop

    741 - crush sleeve and shims?

    "You may also be getting that tight reading because sitting on the shelf all these years the oil drained away from the bearings. So squirt some oil in to those rollers and see if that doesn't change your preload." thanks, Yeah, I did consider that as a big factor. I only have 'click' style...
  16. 70Hardtop

    741 - crush sleeve and shims?

    I appreciate the advice John and have a question about your post after this... Yes true, well even though this guy is white South African, he still has the Aussie trademark attitude of that as I described. I don't think there would be many places in Aust that would run in and get a torque...
  17. 70Hardtop

    741 - crush sleeve and shims?

    "just curious but what was the pinion preload that you say was too tight ----.most people cannot believe how tight 20-25 in/lbs rotating will feel when turning just the pinion and the effort increases with the carrier installed" Well as I said, I have not checked that yet although I have two...
  18. 70Hardtop

    741 - crush sleeve and shims?

    Great advice, I do have a 6" Vernier and I also have a 440 pushrod, so I will look into that. The dummy bearing is a good idea but will have to see what I have in that department.
  19. 70Hardtop

    741 - crush sleeve and shims?

    wow, that is a big difference with the seal. I will get into it, no way to learn without some hands on. Will order a correct socket for the nut tonight. Thanks for your help and sounds like you are pretty experienced.
  20. 70Hardtop

    741 - crush sleeve and shims?

    yes the centre is out and as I said all newly rebuilt, so yes, new bearings. I have not as yet put a torque wrench onto it (have to hunt up a 1-1/8" socket) but I can know without any doubt that it is more than inch pounds. I can turn it with two hands and the diff guy who is twice my size and...
  21. 70Hardtop

    741 - crush sleeve and shims?

    Thanks for that info Jadaharabi - that's exactly what I was looking for! Of course, I will only learn if I pull it apart myself but now I have a better idea of where things go. I was not sure about setting, if pinion depth and doing preload and backlash were the same, I thought these were the...
  22. 70Hardtop

    741 - crush sleeve and shims?

    thanks for clarification Cass, yes I see now, sorry I did not notice that popup as they are very small and I am not usually looking for, or tuned in to looking for popups. What happened is that when I clicked on the 741 selection the left hand side picture came up with the crush tube picture...
  23. 70Hardtop

    741 - crush sleeve and shims?

    Thanks guys, just as I thought. I know Dr Diff is pretty good usually, although on the two occasions where I emailed both these guys to confirm, with what I thought were emails worthy of a good reply, both were not at all helpful (no helpful explanation, just a link) so that's why I came here...
  24. 70Hardtop

    741 - crush sleeve and shims?

    Hi all, I need to get the pinion preload reset on my 741 (it is too tight from a previous rebuild many years ago) and want to buy a set of shims to give to the diff shop. (BTW , I'm in Australia so not much info around on these 8.75's, and differential shops usually are not familiar with old...
  25. 70Hardtop

    Video reference, TF727 600hp rebuild

    Surely couldn't be as bad as the kiwi accent? That takes the cake for horrible-ness. BTW, spellings are: "awful" "Grateful"
  26. 70Hardtop

    8.75 SureGrip , Is this Normal?

    I'm not sure why the pinion is stiff, I don't think it would be foreign matter, but as I said, now with oil all around it, it is a little easier. However it still behaves like an open centre. And no, with it out of the car and no axles, it was still super tight to turn. With both axles bolted...
  27. 70Hardtop

    8.75 SureGrip , Is this Normal?

    OK, I'm not sure...is that the LSD additive that is required when using standard gear oil? Because i am using an 85W-140 high quality transmission/diff oil that states it is for use in LSD's (In Australia, LSD is just the blanket term for Limited Slip Diff, applies to all makes of car). Or do...
  28. 70Hardtop

    8.75 SureGrip , Is this Normal?

    yes, good idea. I was also thinking that will make it better all round.
  29. 70Hardtop

    8.75 SureGrip , Is this Normal?

    Thanks AJ, interesting about the differences. and I'm glad you said about the directions of rotations. Hopefully that means mine is behaving normally. But just too stiff. Don't forget it has been sitting dry on a shelf for about 3 years. Although I would have liked to have thought that the...
  30. 70Hardtop

    What can the 7.25 handle?

    My 71 Challenger 318 2bbl had a 7.25. Unless it had been put in afterwards, I can't be sure but I very much doubt it as this car was bought as an unmodded family car. Chrysler wouldn't have used this diff in a heavy car with a 318 unless they were reasonably confident it would handle the load...
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