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Mark Pascoe

Help needed identifying SRB ball diff parts

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Hi folks

I stripped down a SRB gearbox today that I’ve had sitting in my parts box for years. Inside it were these parts from a ball diff. Can anybody help me identify what they are? I have no idea what the aluminium gear is from but I think the 2 axles and pressure disc may be Thorp items from the SRB ball diff (4435) but I can’t be sure.

Any advice would be greatly appreciated  .

40C5CA48-07D5-4614-9C30-6651C26C0AEC.jpeg

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45 minutes ago, Juggular said:

Here is an instruction for SRB, which shows 9 balls?  

S1cCP2H.jpg

Thank you, looking at the parts list I may have a pressure disc, part# 4442 and 2 right hand axles, part# 4445. Possibly. 

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On 4/6/2019 at 1:18 PM, SuperChamp82 said:

The aluminium gear looks like the bottom half of a Nodis geared diff. 

Thanks for the info. I’ve had a bit more of a dig around and I don’t think it’s a Nodis gear, that diff is quite a different design. Don’t know if you’ve seen this but some good Nodis info here: https://www.tamiyaclub.com/article.asp?id=186 

I think it’s more likely to be a MPI gear. Again some good info here on tha MPI diff if you haven’t already seen it: https://www.tamiyaclub.com/showroom_model.asp?cid=43754&id=5475 I still think the axles and pressure disc are Thorp however. 

Photo of a MPI diff gear for reference (not mine).

FE5295CE-D4CE-440A-9357-2F08EAE5974E.jpeg

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That looks like an MIP diff. Here is a pic of mine.  

DEF6D67F-64A5-4C50-8B21-1614CC2B55EB_zps

yours has longer outdrives for the SRB universals. 

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On 4/8/2019 at 4:15 AM, Shodog said:

That looks like an MIP diff. Here is a pic of mine.  

DEF6D67F-64A5-4C50-8B21-1614CC2B55EB_zps

yours has longer outdrives for the SRB universals. 

Thanks Shodog.

That’s a nice piece of kit there, I’ve seen some of the stuff you have collected, very nice.

I agree about the aluminium gear being MIP but looking at the axles they don’t have the 3 tapped holes like the MPI ones. Can I ask you, do both your MPI axles/outdrives have tapped holes, either internally or externally? My axles have no holes. I’m still leaning towards them being 2 right hand Thorp axles.

As for the pressure disc, not sure. 

The black plastic/nylon counter shaft gear is another mystery! and as for the “input” shaft/gear (last 2 pieces in the far right in the photo) god knows what they were thinking, I don’t know what it’s from but it wouldn’t work in a million years! 

 

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I’ve managed to pick up some NIP Thorp ball diff parts which has allowed me to compare them to these parts. The 2 axles are definitely Thorp right hand axles, part# 4445, but the pressure disc is not a Thorp one and as it fits the aluminium gear perfectly I’m assuming it’s a MIP ball diff one?

So a bit more of the puzzle solved. 

Next decision is do I sell/trade the MIP parts or try and find the missing parts to complete the diff, I suspect option 2 could be a challenge!

 

DECB1CD4-9897-4CFB-8DCA-74BFC364F39D.jpeg

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