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Stock rear end is NOT posi. It is now called Dana44, same diff as a
lot of 4x4 front as well as others.<br>
A normal rear end shop can put posi in if someone didn't do yours
before.<br>
Axles, bearings, hubs are unique Tiger.<br>
Stock is about 2450RPM at 60, way too fast unless you have a big cam
IMHO.<br>
Big carb, hopped up 289, you probably get 14mpg highway? Ouch.<br>
I have a stock 5.0L/T-5 wide ratio.. maybe 220HP, 14in wheels
=1950RPM at 70.. NICE. Like a modern car<br>
MPG > 20 but not sure..<br>
Good luck,<br>
Gary<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/16/2019 8:02 AM, Joel Martin via
Tigers wrote:<br>
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<p class="ydpe3a33268MsoNormal">The manual shows that Tiger
rear ends are:<span> </span>Salisbury hypoid ‘4.HA’ with
a 2.88 to 1
ratio.<span> </span>What does the 4.HA stand for?</p>
<p class="ydpe3a33268MsoNormal">My understanding is these
are posi traction meaning both
wheels are applying power.</p>
<p class="ydpe3a33268MsoNormal">Those of you with 2.88 rear
ratio gears, wide ratio 4 speed
top loader transmissions, what is your RPM’s in fourth at
50, 60,70 & 80
MPH?
</p>
<p class="ydpe3a33268MsoNormal">Those of you running other
rear end rations, other factors
the same, what are your RPM’s at the same speed and what
ratio?</p>
<p class="ydpe3a33268MsoNormal">I like to drive my cars and
just got back from a 1,263 mile
6 day trip in my original owner 1973 MGB with 229,000
miles on the car.
</p>
<p class="ydpe3a33268MsoNormal">Things to consider:<span>
</span>1966 MK1A with 289 HiPo motor with about 300 HP and
estimated 9.4.1 compression</p>
<p class="ydpe3a33268MsoNormal">600 cfm 4 barrel Holley
carburetor</p>
<p class="ydpe3a33268MsoNormal">Headers with 2.25” exhaust</p>
<p class="ydpe3a33268MsoNormal">15” wheels running 205\50 x
15 tires</p>
<p class="ydpe3a33268MsoNormal">Wide ratio top loader 4
speed transmission</p>
<p class="ydpe3a33268MsoNormal">Believe Salisbury posi rear
end </p>
<p class="ydpe3a33268MsoNormal">Closed, open, locked, posi,
ratios – the list is
endless.<span> </span>What I am looking for is a
very streetable around town and on the highway posi rear
end ratio that will
work well with a good balance between acceleration for fun
and highway
cruising.<span> </span>I am not there yet. I have the
acceleration for fun part in place but not the highway
cruising (of course - avoid highways\interstate).<br>
</p>
<p class="ydpe3a33268MsoNormal">Data means a lot regarding
RPM’s at speeds between 50 to 80
mph.<span> </span>Those of you who have switched
ratios, please share your pros and cons.</p>
<p class="ydpe3a33268MsoNormal">Thank you for your input.</p>
<p class="ydpe3a33268MsoNormal">Regards</p>
<p class="ydpe3a33268MsoNormal">Joel Martin</p>
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