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Consider a 5 speed (or 6 speed). With a high overdrive you can cruise at 70=
at around 1500-1700 rpm.
In a message dated 11/16/2019 11:03:42 AM Eastern Standard Time, tigers@aut=
ox.team.net writes:
The manual shows that Tiger rear ends are:=C2=A0 Salisbury hypoid =E2=80=98=
4.HA=E2=80=99 with a 2.88 to 1 ratio.=C2=A0 What does the 4.HA stand for?
My understanding is these are posi traction meaning both wheels are applyin=
g power.
Those of you with 2.88 rear ratio gears, wide ratio 4 speed top loader tran=
smissions, what is your RPM=E2=80=99s in fourth at 50, 60,70 & 80 MPH?=C2=
=A0
Those of you running other rear end rations, other factors the same, what a=
re your RPM=E2=80=99s at the same speed and what ratio?
I like to drive my cars and just got back from a 1,263 mile 6 day trip in m=
y original owner 1973 MGB with 229,000 miles on the car.=C2=A0
Things to consider:=C2=A0 1966 MK1A with 289 HiPo motor with about 300 HP a=
nd estimated 9.4.1 compression
600 cfm 4 barrel Holley carburetor
Headers with 2.25=E2=80=9D exhaust
15=E2=80=9D wheels running 205\50 x 15 tires
Wide ratio top loader 4 speed transmission
Believe Salisbury posi rear end
Closed, open, locked, posi, ratios =E2=80=93 the list is endless.=C2=A0 Wha=
t 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 acceleratio=
n for fun and highway cruising.=C2=A0 I am not there yet.=C2=A0 I have the =
acceleration for fun part in place but not the highway cruising (of course =
- avoid highways\interstate).
Data means a lot regarding RPM=E2=80=99s at speeds between 50 to 80 mph.=C2=
=A0 Those of you who have switched ratios, please share your pros and cons.
Thank you for your input.
Regards
Joel Martin
_______________________________________________
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<div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif;
font-size: 14pt; color: #000000;">
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14pt;
color: #000000;">Consider a 5 speed (or 6 speed). With a high overdrive you can
cruise at 70 at around 1500-1700 rpm.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 14pt;
color: #000000;"><br></span></div>
</div>
In a message dated 11/16/2019 11:03:42 AM Eastern Standard Time,
tigers@autox.team.net writes:
<div><br></div>
<div class="quotedReply">
<blockquote style="padding-left: 5px; margin-left: 5px; border-left: blue 2px
solid;">
<div id="yiv3614920762">
<div>
<div class="yiv3614920762yahoo-style-wrap" style="font-family: garamond, new
york, times, serif; font-size: 16px;">
<div>
<div>
<p class="yiv3614920762ydpe3a33268MsoNormal">The manual shows that Tiger rear
ends are: Salisbury hypoid ‘4.HA’ with a 2.88 to 1
ratio. What does the 4.HA stand for?</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">My understanding is these are posi
traction meaning both wheels are applying power.</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">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="yiv3614920762ydpe3a33268MsoNormal">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="yiv3614920762ydpe3a33268MsoNormal">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="yiv3614920762ydpe3a33268MsoNormal">Things to consider: 1966
MK1A with 289 HiPo motor with about 300 HP and estimated 9.4.1 compression</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">600 cfm 4 barrel Holley
carburetor</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Headers with 2.25”
exhaust</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">15” wheels running 205\50 x
15 tires</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Wide ratio top loader 4 speed
transmission</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Believe Salisbury posi rear end</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Closed, open, locked, posi, ratios
– the list is endless. 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. I am not
there yet. I have the acceleration for fun part in place but not the
highway cruising (of course - avoid highways\interstate).</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Data means a lot regarding
RPM’s at speeds between 50 to 80 mph. Those of you who have
switched ratios, please share your pros and cons.</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Thank you for your input.</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Regards</p>
<p class="yiv3614920762ydpe3a33268MsoNormal">Joel Martin</p>
</div>
</div>
</div>
</div>
</div>
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