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Hi all, wonder if anyone could give me some information on the idea of changing out a gen 81 WB 1 tonner diff with something around 2.78 to give me better milage up the highway. I have done some research on earlier model holdens that have run 2.78 ratios, which of these would I be able to bolt straight in. I currently running a 4 speed manual M21 with the 4.2 up front.
Any info on this matter would be great.
thanks
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Joined: 3/03/2005(UTC) Posts: 287 ![Australia]( "Australia")
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Been there done that 253/M21/3.08 diff stay with that combo. The 253 needs some RPM to run, its not a torquey motor and the aero dynamics is not good. did what you want to a HZ Sdn and could only pull 170kph in top gear and that was about 3500 rpm. it jus
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Rank: Member
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Joined: 3/03/2005(UTC) Posts: 287 ![Australia]( "Australia")
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Been there done that 253/M21/3.08 diff stay with that combo. The 253 needs some RPM to run, its not a torque'y motor and the aero dynamics is not good. did what you want to a HZ Sdn and could only pull 170kph in top gear and that was about 3500 rpm. it ju
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Rank: Veteran
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no good, stay with 3.08 or even go to 3.36
AFTER 1972 THERE AINT NO MUSCLE CARS AND MATCHING NUMBERS ARE FOR TIMES TABLES....
XY GTHO PH111 , now thats muscle...
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Agree. It'd be bad enough in first or reverse with a load as it is!
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If we all had the same (good) taste, who would buy all the Fords? |
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If we all had the same (good) taste, who would buy all the Fords? |
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Rank: Veteran
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Joined: 1/03/2005(UTC)
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Agree. Itd be bad enough in first or reverse with a load as it is!
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords? |
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords? |
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From personal experience I would probably leave the diff as it is and spend the money on either a Celica or Supra 5spd box.This way you will get good economy a decent spread of ratios and wont lose to much of your low down grunt.
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Thanks for your help, I will leave her as is.
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