Foxaddict 3 Posted February 16, 2014 I hope someone can help. I thought I'd upgrade my old fox drive shafts with the new novafox dog bones and drives cups. Now, I've built and rebuilt a few foxes in my time and never had a problem. So this one has me scratching my head. When I put it together, with nice tight screws, the diff ends up being locked. So I loosened the gearbox screws a bit, and it improved slightly, but not much. I've downloaded the novafox manual, and There's nothing different in the set up, so I'm not missing a part. I've put a new gear set in, and it's sill the same. The only thing i think it can be is the old gearbox casing!? Has anyone else come across this issue? Help, I don't know what I'm doing wrong. Share this post Link to post Share on other sites
matman 1499 Posted February 17, 2014 I hope someone can help. I thought I'd upgrade my old fox drive shafts with the new novafox dog bones and drives cups. Now, I've built and rebuilt a few foxes in my time and never had a problem. So this one has me scratching my head. When I put it together, with nice tight screws, the diff ends up being locked. So I loosened the gearbox screws a bit, and it improved slightly, but not much. I've downloaded the novafox manual, and There's nothing different in the set up, so I'm not missing a part. I've put a new gear set in, and it's sill the same. The only thing i think it can be is the old gearbox casing!? Has anyone else come across this issue? Help, I don't know what I'm doing wrong. Are you using the E-clips ?. As you DON'T use E-Clips in the OLD fox diff . The New Fox diff is different , to use the E-clips , The Old diff used the C-clips . The out drives maybe a little long ? from what i can see , so you may have to change the length & grind them a little . But the 1st thing is , NO E-clip . I have put in the old drive system into the new fox & that works . But have not done it the other way around . So give that a go & it your still stuck , i can build a diff & see what is wrong & let you know . 1 Share this post Link to post Share on other sites
Foxaddict 3 Posted February 17, 2014 I used the e clips. I'll strip it apart and rebuild and let you know how it goes. 1 Share this post Link to post Share on other sites
WillyChang 1814 Posted February 17, 2014 just about done with NovaFox building & old Fox rebuilding frenzy here too Looked at changing driveshafts on the oldies too, but I'd want to change to the new gearbox casing too. New out drives with e-clips in the old casing will squeeze the diff together too tightly. (given I have just changed my gearboxes with NOS original parts, I wasn't about to carve them up just for installing rere shafts so I cleaned up & rejuvenated the old shafts instead. Plenty of life left!) Share this post Link to post Share on other sites
matman 1499 Posted February 17, 2014 All you need to do is put on the C-clip & NOT the E-clip & it should fit . It's the same with the Boomerang / hotshot / super hotshot re re's gear box's , You need to use the E-clip in the re re's on them , but you just use the C-clip on the Old gear box's if you wanted to use the New dog bone & drives etc . 1 Share this post Link to post Share on other sites
Foxaddict 3 Posted February 17, 2014 Sorted. E clips off, c clips on and it runs a treat. If I did it again I probably wouldn't use the c clips, because the drive cups do still pull out a bit, I'd just run it without. But to be honest, the gearbox has been apart quite a bit over the last few days, and now it ain't broke, I won't try and fix it. I suppose the other option if you're upgrading your old fox is to use the novafox gear set. Many thanks for all your wise words, now time to play! Share this post Link to post Share on other sites
matman 1499 Posted February 18, 2014 I suppose the other option if you're upgrading your old fox is to use the novafox gear set.NO !! It's the diff housing you need to replace ( D tree Part 8 & 9 ) , As the bearings you put into the housingare deeper to allow for the E-clip . " SO IT'S NOT THE GEARS " . Glade you have got it running & now you can have some fun . Share this post Link to post Share on other sites
WillyChang 1814 Posted February 18, 2014 Last night took a Fox out for a run, first time since -uh, time immemorial. Wow even stock darned thing goes like a scalded cat, on flat unpaved terrain handles pretty well too. Share this post Link to post Share on other sites