[Fot] Broken Diffs

Thu Nov 22 12:23:57 MST 2018

 Back to broken diffs.  At the suggestion of Bob Tullius, I welded up the spider gears in the diff of my TR-4A IRS.  I raced with this setup, using all of the available gear ratios, for 24 years, and never had a driveline failure, including driveshaft, half shafts and differential.  I used Corvair stub axles (also per Tullius), and with these, I never had a stub axle failure.  I always felt the welded up rear end was easier on the drive train than the various LSD's available at that time (Detroit Locker was the most popular).
Just relaying my experience.
Jack Wheeler

    On Thursday, November 22, 2018, 1:31:25 PM EST, Mike Munson via Fot <fot at autox.team.net> wrote:  

 I took it as Keith was throwing those numbers out there to give us an idea as to how much power the LSDs can handle. Thanks Keith, it was helpful info. FYI I use Lincoln Lockers in my TR6. I won’t post dyno sheets because my HP/Talent ratio is too high!
Mike #28 TR6

Sent from Yahoo Mail for iPhone

On Wednesday, November 21, 2018, 7:27 PM, John Styduhar via Fot <fot at autox.team.net> wrote:

Any of you blokes that claim HP numbers need to attach the dyno sheet.  

On Wed, Nov 21, 2018 at 12:11 PM Keith Files via Fot <fot at autox.team.net> wrote:

Hi Bob,
i am pretty sure that Tran X is the same as a Salisbury LSD and is still available through TR Enterprises here in the UK.
I do not know what car you are using (TR4 i think) so a new Tran X is probably ok. I have 2 Salisbury LSD units in 2 axles for my TR4.
However, if you are running a TR6 then I would recommend a Gripper LSD as they can handle the extra power and need a lot less maintenance than the Salisbury (I swapped out and sold both my Salisbury LSDs for 2 new Grippers for my TR6).
www.gripperlsd.com
Of interest my TR4 produces 194 bhp at the flywheel and my TR6 produces 252 bhp at the flywheel.
Hope that helps,
Keith

On 21 Nov 2018, at 14:40, Jack Wheeler via Fot <fot at autox.team.net> wrote:
 Should be a lot of used carriers around?

    On Tuesday, November 20, 2018, 11:34:42 PM EST, Robert Lang via Fot <fot at autox.team.net> wrote:  

 Hi,
I broke a diff at Thompson back in October and I finally did a post-mortem. Looks like a couple of bolts backed out and when the shit hit the fan, the 4 or 5 that were still holding on sheared off. In any case, lots of metal bits in there. Some of the big pieces bounced around in the diff and there's some gouges in the Tran-X center section. The question to the group is - assuming that I find no cracks in the center section, it it accepted practice to clean off the dings to prevent stress risers and re-use it or is this a "tosser".
Speaking of Tran-X, does anyone sell those now or are we limited to Quaife and GKN? I see that Rimmer lists both of those units. To be honest, I'm not a fan of Quaife because I have to run the rear a lot softer to prevent wheel spin in the tight stuff - that kills my times at places like Thompson and Palmer (like 1.5 to 2 seconds a lap.) Speaking of GKN, I know nothing about them other than "clutch type differential". Feel free to chime in if you have experience with those units.

Also, I am nearly 100% certain that I was using new lock washers and Red Loctite high strength thread compound, so the bolts backing out was a total surprise when I cracked the case open. I was assuming that the pinion head had sheared off based on how the car felt when the diff broke. It was BANG and done - box full of neutrals.
Off topic - looks like I'm not driving at ButtonWillow, I got a reply from Joe Siam that he has nothing available for that date. Oh well. Look like my budget is going to gears and stuff anyway... ;-)
c ya,Bob Lang
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