<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I have a T5 with 3.31:1 gears. Runs around 2200 rpm at 70 mph. I’m using a Torsen type LSD with 28 spline axles from Sunbeam Specificities. I used a TruTrac diff. But there are others.<div class=""><br class=""></div><div class="">If keeping the 4 speed, I’d suggest using one of the online calculators to determine engine RPM at various speeds with various rear gears. Maybe a 3.00:1 ? Lot’s of choices. <br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 16, 2019, at 8:47 AM, Theo Smit via Tigers <<a href="mailto:tigers@autox.team.net" class="">tigers@autox.team.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="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=""><div class="">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=""><br data-mce-bogus="1" class=""></div><div class="">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=""><br data-mce-bogus="1" class=""></div><div class="">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=""><br data-mce-bogus="1" class=""></div><div class="">-Theo</div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br class=""></div><hr id="zwchr" data-marker="__DIVIDER__" class=""><div data-marker="__HEADERS__" class=""><b class="">From:<span class="Apple-converted-space"> </span></b>"tigers" <<a href="mailto:tigers@autox.team.net" class="">tigers@autox.team.net</a>><br class=""><b class="">To:<span class="Apple-converted-space"> </span></b>"Joel Martin" <<a href="mailto:jmartiniii@yahoo.com" class="">jmartiniii@yahoo.com</a>>, "tigers" <<a href="mailto:tigers@autox.team.net" class="">tigers@autox.team.net</a>><br class=""><b class="">Sent:<span class="Apple-converted-space"> </span></b>Saturday, November 16, 2019 9:16:34 AM<br class=""><b class="">Subject:<span class="Apple-converted-space"> </span></b>Re: [Tigers] Tiger Differential<br class=""></div><div class=""><br class=""></div><div data-marker="__QUOTED_TEXT__" class="">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="">A normal rear end shop can put posi in if someone didn't do yours before.<br class="">Axles, bearings, hubs are unique Tiger.<br class="">Stock is about 2450RPM at 60, way too fast unless you have a big cam IMHO.<br class="">Big carb, hopped up 289, you probably get 14mpg highway? Ouch.<br class="">I have a stock 5.0L/T-5 wide ratio.. maybe 220HP, 14in wheels =1950RPM at 70.. NICE. Like a modern car<br class="">MPG > 20 but not sure..<br class="">Good luck,<br class="">Gary<br class=""><br class=""><br class=""><div class="moz-cite-prefix">On 11/16/2019 8:02 AM, Joel Martin via Tigers wrote:<br class=""></div><blockquote cite="mid:381467494.773614.1573920156530@mail.yahoo.com" class=""><div class="yahoo-style-wrap" style="font-family: garamond, "new york", times, serif; font-size: 16px;"><div class=""><div class=""><p class="ydpe3a33268MsoNormal">The manual shows that Tiger rear ends are:<span class=""> <span class="Apple-converted-space"> </span></span>Salisbury hypoid ‘4.HA’ with a 2.88 to 1 ratio.<span class=""> <span class="Apple-converted-space"> </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 class=""> <span class="Apple-converted-space"> </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 class=""> <span class="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=""> <span class="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=""></p><p class="ydpe3a33268MsoNormal">Data means a lot regarding RPM’s at speeds between 50 to 80 mph.<span class=""> <span class="Apple-converted-space"> </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></div><br class=""></div></div><br class=""><fieldset class="mimeAttachmentHeader"></fieldset><pre class="moz-quote-pre">_______________________________________________
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