[Tigers] Tiger Differential

[coolvt at aol.com]

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 at autox.team.net writes:


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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