superdiff

bughiabuggy · Posted: Fri Mar 20, 2015 9:50 pm Post subject: superdiff

I am in the process of building a superdiff. My problem is the output shafts are binding. The spiders are fine but its like they machined this housing to not use shims on the output shafts. It's a bugpack superdiff. Only info I find when I search is they are sloppy.if i assemble it without the thrust shims it almost perfect. Can anyone tell me if its supposed to go together without the shins? I would rather not do that. I wanted to have this together this weekend but I may have to hold off and shave a bit off at work Monday.

bugguy076 · Posted: Sat Mar 21, 2015 3:57 am Post subject:

Yes it needs shims. Without them the housing would wear quickly.
I drag race, and over the years I have used a few different manufactures diffs. Some are better than others and fit better. As long as you can turn the output shafts with a pair of slip joint pliers when it's together, it will work fine.
I shim mine tight so they won't turn. If an axle or CV joint breaks it will slip, and is still controlable and won't throw me into the wall.
_________________
Grubby Fingers Racing
1976 Drag Bug
1967 Street Bug

bughiabuggy · Posted: Sat Mar 21, 2015 4:54 am Post subject:

Do you recommend shaving the shim area on the diff cover or turn down the output shafts. If I put it on the tight side like your saying ill only need to cut the one side bit but something tells me to not take that much off one side of the output shafts. Are there shims for the diff cover plate? I wouldn't be able to shim it as it sits but just curious. There would hardly be any of the lip inside the cover touching.

vwracerdave · Posted: Sat Mar 21, 2015 4:56 am Post subject:

There are different super diffs for 10 tooth spider gears and 11 tooth spider gears.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK

bughiabuggy · Posted: Sat Mar 21, 2015 5:02 am Post subject:

Are the short shafts for the spiders supposed to be angled? The ends of the shafts barely go into the center sleeve. Dont seem very good to me.

mark tucker · Posted: Sat Mar 21, 2015 8:45 am Post subject:

yup there angled and look like poop,but they work.I like tight in the diff,and loose everywhere else.you may need to do some shim swaping or get thiner shim.is it both ends tight or just one end?are they the right gears? are they in correctly?

bughiabuggy · Posted: Sat Mar 21, 2015 10:08 am Post subject:

I read somewhere to try reorienting the gears and try it. I kept them paired but moved them and it went right together. It's torqued down and I can still move it all the way around without any binding. The bearing preload worked out but I'm gonna stop and get some plastiguage on my way home today to check the r&p backlash. It feels about ..005 but I'm gonna make sure. I dont feel like pulling it again. Dual webbers are a pain in the ass in a bug.

mark tucker · Posted: Sat Mar 21, 2015 12:45 pm Post subject:

plastigauge for backlash??? thats a new one for me.

[email protected] · Posted: Sat Mar 21, 2015 1:00 pm Post subject:

Bugpack's Superdiffs are one of the diffs made for 10 tooth spider gears. You have the 10 tooth spider, 15 tooth side gear combo, correct?

bughiabuggy · Posted: Sat Mar 21, 2015 3:00 pm Post subject:

Pretty sure I have 11 and 17? Does that sound right? I took one of my diffs with me to a place called archway and they sold me the stuff. I'm not 100% on what brand it is I'm going off of reading that bugpacks have 1/8 roll pins.i counted the teeth once to make sure everything was the same but that was the other day and I really wasn't paying attention I was just making sure everything I had matched. It's together now and about to go in the car. One thing I noticed when I put it together was the original casting wasn't large enough in a little area and the machined area was all shitty looking. Too late to take it back but if I would have noticed it there I wouldn't have bought it. The area isn't in the gear area but its just shotty work. That would have never been allowed out the door where I work. It would have been in the scrap barrel.

[email protected] · Posted: Sat Mar 21, 2015 5:33 pm Post subject:

Bugpack's part number is 5072-10 for their diff that is for 10 tooth spiders. If you didn't get any box, or anything, it's anyone's guess. Bugpack Diffs do have the 1/8 inch roll pins, and they are perpendicular to the ring gear mounting surface. Weddle's diffs use 6mm roll pins that are parallel to the ring gear surface.

mark tucker · Posted: Sun Mar 22, 2015 10:49 am Post subject:

Most of what is sold these days should be in the scrap pile Shocked

and a lot of it makes it's way there much sooner than it should Wink

thus the reason to rework everything so it's up to the task asked of it.


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