[Tigers] Tiger Differential

Sat Nov 16 11:38:28 MST 2019

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.

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. 

> On Nov 16, 2019, at 8:47 AM, Theo Smit via Tigers <tigers at autox.team.net> wrote:
> 
> 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.
> 
> 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.
> 
> 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.
> 
> -Theo
> 
> 
> 
> 
> From: "tigers" <tigers at autox.team.net <mailto:tigers at autox.team.net>>
> To: "Joel Martin" <jmartiniii at yahoo.com <mailto:jmartiniii at yahoo.com>>, "tigers" <tigers at autox.team.net <mailto:tigers at autox.team.net>>
> Sent: Saturday, November 16, 2019 9:16:34 AM
> Subject: Re: [Tigers] Tiger Differential
> 
> 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 =1950RPM at 70.. NICE.  Like a modern car
> MPG > 20 but  not sure..
> Good luck,
> Gary
> 
> 
> On 11/16/2019 8:02 AM, Joel Martin via Tigers wrote:
> 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?
> 
> My understanding is these are posi traction meaning both wheels are applying power.
> 
> 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? 
> 
> Those of you running other rear end rations, other factors the same, what are your RPM’s 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 my original owner 1973 MGB with 229,000 miles on the car. 
> 
> Things to consider:  1966 MK1A with 289 HiPo motor with about 300 HP and estimated 9.4.1 compression
> 
> 600 cfm 4 barrel Holley carburetor
> 
> Headers with 2.25” exhaust
> 
> 15” wheels running 205\50 x 15 tires
> 
> Wide ratio top loader 4 speed transmission
> 
> Believe Salisbury posi rear end
> 
> 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).
> 
> 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.
> 
> Thank you for your input.
> 
> Regards
> 
> Joel Martin
> 
> 
> 
> 
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