[Tigers] Tiger Differential

[Joel Martin]

The manual shows that Tiger rear ends are:  Salisbury hypoid ‘4.HA’ with a 2.88 to 1ratio.  What does the 4.HA stand for?

My understanding is these are posi traction meaning bothwheels are applying power.

Those of you with 2.88 rear ratio gears, wide ratio 4 speedtop loader transmissions, what is your RPM’s in fourth at 50, 60,70 & 80MPH? 

Those of you running other rear end rations, other factorsthe 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 mile6 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 isendless.  What I am looking for is avery streetable around town and on the highway posi rear end ratio that willwork well with a good balance between acceleration for fun and highwaycruising.  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 80mph.  Those of you who have switchedratios, please share your pros and cons.

Thank you for your input.

Regards

Joel Martin

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