[Tigers] axle spline

[Gary]

 Dave,
Stock Tigers came with a Salisbury rearend. Salisbury is the British subsidiary of Dana/Spicer Corp. These British units came in Sunbeam Tigers, Jag XKEs, AC Cobras and TVR Griffiths, and used 7/16" ring gear bolts and a 10 spline (coarse) pinion gear. The factory offered other LAT ratios of 3.07, 3.31, 3.54 and 3.73 for those units.
The American version of the Dana 44 rearend uses 3/8" ring gear bolts and a 26 spline (fine) pinion gear. Most Tiger owners in the USA, who have upgrade to a positraction unit (limited-slip) and changed their rearend ratio to something other than the factory 2.88, have installed the American version with the 3/8" ring gear bolts and switch over to the fine spline input flange.
If you changed back to 2.88s, you would have to find an original Salisbury posi unit (rare) or drill out an American unit for the 7/16" ting gear bolts and get a 10 spline input flange.
In the 1980s Dana made Dane 44 2.72 rearend gears for Jeep Wagoneers, Cherokees, Grand Cherokees and C3 Corvettes. The 2.72 gears have 3/6" ring gear bolts and a fine spline pinion, and will bolt into any Tiger rearend that has the American differential.
Since I sold you the posi unit in your car (2009), this is what I recommend. The 2.72 gears will bolt right up to your posi unit and you can use your existing fine spline pinion gear flange. Changing from 3.07s to 2.72s will give you a ~14% drop in rpms in 4th gear, ~300 rpms.  However, your 1st gear will be taller, too, so do NOT run 2.72 gears with a close ratio transmission or you'll burn up your clutch in no time. 2.88 gears are bad enough with a close ratio in 1st gear, so 2.72s will be worse.
My other recommendation is to convert to a wide ratio transmission and install a 2.90 1st gear (from Dan William's Toploaders). This gives you a fabulous hole shot, while not impacting your 4th gear highway cruising. I have helped a bunch of Tiger owners convert to this setup and they all love it. It is the best of both worlds, short of a 5 speed, but at a fraction of the cost.
Gary
    On Sunday, November 17, 2019, 06:37:42 AM MST, Dave Munroe via Tigers <tigers at autox.team.net> wrote:  
   So Clyde;
Are you saying my stock rear end ( '65 Mark 1A -  B382000450) which came to me with a 3:07 set of gears could be easily changed back to a set of stock 2:88 gears ( or even lower!) ?
Do you know what the lowest possible gear set might be?
Love to drop my cruising speed rpm to something more comfortable.
Dave  
  Sent from my BlackBerry — the most secure mobile device — via the Bell Network  
|   From: tigers at autox.team.netSent: November 17, 2019 9:25 AMTo: tigers at autox.team.netReply to: clydemclaughlin at verizon.netSubject: [Tigers] axle spline |

 
 You don't need to worry about spline count on axle unless you rpl the tiger axles with something else, I changed to Ford axles. Thats another story..The other spline to note is the pinion if you change the ring and pinion. The early Dana 44 pinions have a course spline, all new replacement gears have a finer spline, more surface area and are stronger, it will require a companion flange to connect the drive shaft.  These are readily available_______________________________________________

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