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I have a T5 with 3.31:1 gears. Runs around 2200 rpm at 70 mph. I=E2=80=99m=
using a Torsen type LSD with 28 spline axles from Sunbeam =
Specificities. I used a TruTrac diff. But there are others.
If keeping the 4 speed, I=E2=80=99d suggest using one of the online =
calculators to determine engine RPM at various speeds with various rear =
gears. Maybe a 3.00:1 ? Lot=E2=80=99s of choices.=20
> On Nov 16, 2019, at 8:47 AM, Theo Smit via Tigers =
<tigers@autox.team.net> wrote:
>=20
> Didn't the axle spline count change at some point? So you can do the =
conversion but there are a few extra tweaks necessary, possibly up to =
and including the installation of new axles.
>=20
> IIRC most of the period posi conversions were done using a Jaguar =
differential assembly. Then there is something that sticks in my mind =
where the original ring gear bolts are smaller than what is being used =
now. So if you're using a modern posi unit then you have to use stepped =
ring gear bolts.
>=20
> My Tiger has the 3.31 gears (and a Torsen LSD) and it spins at about =
3000 RPM at 60 MPH, in fourth. The five speed makes it livable but first =
gear is really short. Still need to change it over to the Z ratios.
>=20
> -Theo
>=20
>=20
>=20
>=20
> To: "Joel Martin" <jmartiniii@yahoo.com =
> Sent: Saturday, November 16, 2019 9:16:34 AM
> Subject: Re: [Tigers] Tiger Differential
>=20
> Stock rear end is NOT posi. It is now called Dana44, same diff as a =
lot of 4x4 front as well as others.
> A normal rear end shop can put posi in if someone didn't do yours =
before.
> Axles, bearings, hubs are unique Tiger.
> Stock is about 2450RPM at 60, way too fast unless you have a big cam =
IMHO.
> Big carb, hopped up 289, you probably get 14mpg highway? Ouch.
> I have a stock 5.0L/T-5 wide ratio.. maybe 220HP, 14in wheels =
=3D1950RPM at 70.. NICE. Like a modern car
> MPG > 20 but not sure..
> Good luck,
> Gary
>=20
>=20
> On 11/16/2019 8:02 AM, Joel Martin via Tigers wrote:
> The manual shows that Tiger rear ends are: Salisbury hypoid =
=E2=80=984.HA=E2=80=99 with a 2.88 to 1 ratio. What does the 4.HA stand =
for?
>=20
> My understanding is these are posi traction meaning both wheels are =
applying power.
>=20
> Those of you with 2.88 rear ratio gears, wide ratio 4 speed top loader =
transmissions, what is your RPM=E2=80=99s in fourth at 50, 60,70 & 80 =
MPH?=20
>=20
> Those of you running other rear end rations, other factors the same, =
what are your RPM=E2=80=99s at the same speed and what ratio?
>=20
> 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.=20
>=20
> Things to consider: 1966 MK1A with 289 HiPo motor with about 300 HP =
and estimated 9.4.1 compression
>=20
> 600 cfm 4 barrel Holley carburetor
>=20
> Headers with 2.25=E2=80=9D exhaust
>=20
> 15=E2=80=9D wheels running 205\50 x 15 tires
>=20
> Wide ratio top loader 4 speed transmission
>=20
> Believe Salisbury posi rear end
>=20
> Closed, open, locked, posi, ratios =E2=80=93 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).
>=20
> Data means a lot regarding RPM=E2=80=99s at speeds between 50 to 80 =
mph. Those of you who have switched ratios, please share your pros and =
cons.
>=20
> Thank you for your input.
>=20
> Regards
>=20
> Joel Martin
>=20
>=20
>=20
>=20
> _______________________________________________
>=20
>=20
> Donate: http://www.team.net/donate.html =
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>=20
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>=20
>=20
>=20
>=20
> _______________________________________________
>=20
> tigers@autox.team.net
>=20
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> Archive: http://www.team.net/pipermail/tigers =
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>=20
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>=20
>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">I =
have a T5 with 3.31:1 gears. Runs around 2200 rpm at 70 mph. I=E2=80=99m =
using a Torsen type LSD with 28 spline axles from Sunbeam Specificities. =
I used a TruTrac diff. But there are others.<div class=3D""><br =
class=3D""></div><div class=3D"">If keeping the 4 speed, I=E2=80=99d =
suggest using one of the online calculators to determine engine RPM at =
various speeds with various rear gears. Maybe a 3.00:1 ? Lot=E2=80=99s =
of choices. <br class=3D""><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Nov 16, 2019, at 8:47 AM, =
Theo Smit via Tigers <<a href=3D"mailto:tigers@autox.team.net"; =
class=3D"">tigers@autox.team.net</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; font-family: =
arial, helvetica, sans-serif; font-size: 10pt;" class=3D""><div =
class=3D"">Didn't the axle spline count change at some point? So you can =
do the conversion but there are a few extra tweaks necessary, possibly =
up to and including the installation of new axles.</div><div =
class=3D""><br data-mce-bogus=3D"1" class=3D""></div><div class=3D"">IIRC =
most of the period posi conversions were done using a Jaguar =
differential assembly. Then there is something that sticks in my mind =
where the original ring gear bolts are smaller than what is being used =
now. So if you're using a modern posi unit then you have to use stepped =
ring gear bolts.</div><div class=3D""><br data-mce-bogus=3D"1" =
class=3D""></div><div class=3D"">My Tiger has the 3.31 gears (and a =
Torsen LSD) and it spins at about 3000 RPM at 60 MPH, in fourth. The =
five speed makes it livable but first gear is really short. Still need =
to change it over to the Z ratios.</div><div class=3D""><br =
data-mce-bogus=3D"1" class=3D""></div><div class=3D"">-Theo</div><div =
class=3D""><br data-mce-bogus=3D"1" class=3D""></div><div class=3D""><br =
data-mce-bogus=3D"1" class=3D""></div><div class=3D""><br =
data-mce-bogus=3D"1" class=3D""></div><div class=3D""><br =
class=3D""></div><hr id=3D"zwchr" data-marker=3D"__DIVIDER__" =
class=3D""><div data-marker=3D"__HEADERS__" class=3D""><b =
class=3D"">From:<span =
class=3D"Apple-converted-space"> </span></b>"tigers" <<a =
href=3D"mailto:tigers@autox.team.net"; =
class=3D"">tigers@autox.team.net</a>><br class=3D""><b =
class=3D"">To:<span class=3D"Apple-converted-space"> </span></b>"Joel=
Martin" <<a href=3D"mailto:jmartiniii@yahoo.com"; =
class=3D"">jmartiniii@yahoo.com</a>>, "tigers" <<a =
href=3D"mailto:tigers@autox.team.net"; =
class=3D"">tigers@autox.team.net</a>><br class=3D""><b =
class=3D"">Sent:<span =
class=3D"Apple-converted-space"> </span></b>Saturday, November 16, =
2019 9:16:34 AM<br class=3D""><b class=3D"">Subject:<span =
class=3D"Apple-converted-space"> </span></b>Re: [Tigers] Tiger =
Differential<br class=3D""></div><div class=3D""><br class=3D""></div><div=
data-marker=3D"__QUOTED_TEXT__" class=3D"">Stock rear end is NOT =
posi. It is now called Dana44, same diff as a lot of 4x4 front as =
well as others.<br class=3D"">A normal rear end shop can put posi in if =
someone didn't do yours before.<br class=3D"">Axles, bearings, hubs are =
unique Tiger.<br class=3D"">Stock is about 2450RPM at 60, way too fast =
unless you have a big cam IMHO.<br class=3D"">Big carb, hopped up 289, =
you probably get 14mpg highway? Ouch.<br class=3D"">I have a stock =
5.0L/T-5 wide ratio.. maybe 220HP, 14in wheels =3D1950RPM at 70.. =
NICE. Like a modern car<br class=3D"">MPG > 20 but not =
sure..<br class=3D"">Good luck,<br class=3D"">Gary<br class=3D""><br =
class=3D""><br class=3D""><div class=3D"moz-cite-prefix">On 11/16/2019 =
8:02 AM, Joel Martin via Tigers wrote:<br class=3D""></div><blockquote =
cite=3D"mid:381467494.773614.1573920156530@mail.yahoo.com" class=3D""><div=
class=3D"yahoo-style-wrap" style=3D"font-family: garamond, "new =
york", times, serif; font-size: 16px;"><div class=3D""><div =
class=3D""><p class=3D"ydpe3a33268MsoNormal">The manual shows that Tiger =
rear ends are:<span class=3D""> <span =
class=3D"Apple-converted-space"> </span></span>Salisbury hypoid =
=E2=80=984.HA=E2=80=99 with a 2.88 to 1 ratio.<span class=3D""> <span=
class=3D"Apple-converted-space"> </span></span>What does the 4.HA =
stand for?</p><p class=3D"ydpe3a33268MsoNormal">My understanding is =
these are posi traction meaning both wheels are applying power.</p><p =
class=3D"ydpe3a33268MsoNormal">Those of you with 2.88 rear ratio gears, =
wide ratio 4 speed top loader transmissions, what is your RPM=E2=80=99s =
in fourth at 50, 60,70 & 80 MPH? </p><p =
class=3D"ydpe3a33268MsoNormal">Those of you running other rear end =
rations, other factors the same, what are your RPM=E2=80=99s at the same =
speed and what ratio?</p><p class=3D"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=3D"ydpe3a33268MsoNormal">Things to consider:<span =
class=3D""> <span =
class=3D"Apple-converted-space"> </span></span>1966 MK1A with 289 =
HiPo motor with about 300 HP and estimated 9.4.1 compression</p><p =
class=3D"ydpe3a33268MsoNormal">600 cfm 4 barrel Holley carburetor</p><p =
class=3D"ydpe3a33268MsoNormal">Headers with 2.25=E2=80=9D exhaust</p><p =
class=3D"ydpe3a33268MsoNormal">15=E2=80=9D wheels running 205\50 x 15 =
tires</p><p class=3D"ydpe3a33268MsoNormal">Wide ratio top loader 4 speed =
transmission</p><p class=3D"ydpe3a33268MsoNormal">Believe Salisbury posi =
rear end</p><p class=3D"ydpe3a33268MsoNormal">Closed, open, locked, =
posi, ratios =E2=80=93 the list is endless.<span class=3D""> <span =
class=3D"Apple-converted-space"> </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 class=3D""> <span =
class=3D"Apple-converted-space"> </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 =
class=3D""></p><p class=3D"ydpe3a33268MsoNormal">Data means a lot =
regarding RPM=E2=80=99s at speeds between 50 to 80 mph.<span =
class=3D""> <span =
class=3D"Apple-converted-space"> </span></span>Those of you who =
have switched ratios, please share your pros and cons.</p><p =
class=3D"ydpe3a33268MsoNormal">Thank you for your input.</p><p =
class=3D"ydpe3a33268MsoNormal">Regards</p><p =
class=3D"ydpe3a33268MsoNormal">Joel Martin</p></div><br =
class=3D""></div></div><br class=3D""><fieldset =
class=3D"mimeAttachmentHeader"></fieldset><pre =
class=3D"moz-quote-pre">_______________________________________________
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