[Fot] Rear end

[U K MOTORSPORTS]

Bill...caught that diff just in time!!...you are correct, the tunnels in
the case are for lubricating the pinion bearing

Chip Collingwood


> [Original Message]
> From: Bill Babcock <billb at bnj.com>
> To: fot Triumph <fot at autox.team.net>
> Date: 9/30/2007 8:04:39 PM
> Subject: [Fot] Rear end
>
> I'm rebuilding the bits of Peyote while waiting for the fame to be  
> done. Got most of the bends and tweaks out last week, now I need to  
> weld up the cracks and have a few minor mods to the roll cage done. I  
> want a little more room in the driver's compartment.
>
> Anyway, I decided to redo the diff and put in the 3.90 gearset I  
> have. When I took the cover off I found all the ring gear bolts were  
> finger tight--most were turned out several turns, and one was  
> completely out and bouncing around in the diff case--for some time it  
> seems.
>
> I found one of the wheel bearings has some rough spots in it,  
> probably brinneling. I'll replace both. The big surprise was that  
> once I put the new gearset in, it was perfect as far as shimming is  
> concerned. I'm kind of surprised by that. The gear engagement  
> patterns were perfectly centered, deep in the tooth, with a little  
> bit of drag. I'm wondering if these gears are a bit more precisely  
> made than I expected. Took me hours to get that kind of engagement  
> with the previous set.
>
> Does anyone know what the tunnels are for in the diff case? They look  
> like they would be perfect for using the ring gear as a pump wheel  
> for pumping diff oil through a cooler. I assume they are to lube the  
> front pinion bearing, but they look a little too purposeful for that.
>
> I wonder how many more runs I could have had with that diff before it  
> blew to bits. 
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