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[Fot] Rear end

To: fot Triumph <fot@autox.team.net>
Subject: [Fot] Rear end
From: Bill Babcock <billb@bnj.com>
Date: Sun, 30 Sep 2007 17:04:06 -0700
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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