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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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