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1971 1800E Rear Gear ratio? 1800

posted by  RepairmanJackal on  Fri Apr 11 15:28 CST 2008
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last visit: Tue Jun 10 09:52 CST 2014
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What is the normal (factory stock) gear ratio for the rear of a 1971 1800E?

Is it any "better" than the 4.10 gear ratio for the 1968 130? By "better" I mean better mileage at highway speeds with an M41.








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1971 1800E Rear Gear ratio? 1800

posted by  planetman on  Fri Apr 11 16:25 CST 2008
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last visit: Fri Oct 24 09:29 CST 2014
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Hello,

4:30 for manual tranmission equipped
4:10 for automatic transmission equipped
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90501








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is 4.10 a more efficient high-speed ratio than 4.30? 1800

posted by  RepairmanJackal on  Sat Apr 12 10:52 CST 2008
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The 1800E was an M41J manual.








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Yes it is a taller gear,and your engine will rev less.NMI 1800

posted by  Redwood Chair on  Sat Apr 12 15:41 CST 2008
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Yes it is a taller gear,and your engine will rev less.NMI 1800

uid 4464's pic
posted by  brettsutherland on  Sun Apr 13 05:12 CST 2008
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Look at it this way ... one of the first thing OEMs did was go to a lower numerical axle ratio ie from 4:10 to 1 to 3:23 to 1 to improve mileage .... drag racers put in highder numerical ratios like 4:56 to 1 for acceleration off the line ..... and we all know that drag racers are OT looking for mileage ... :-)

Brett

--
Brett Sutherland & the 1.5 million mile 122 CANADIAN --- WINDSOR, Nova Scotia the birthplace of HOCKEY www.ecvintagevolvo.com








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Yes it is a taller gear,and your engine will rev less.NMI 1800

posted by  RepairmanJackal on  Sat Apr 12 18:16 CST 2008
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Sorry, I'm being dense on this. You're saying that the 4:10 is more efficient than the 4:30?

I'd be better off with the 130's stock 4:10 rear end over the 1800E's 4:30 rear end?








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Yes it is a taller gear,and your engine will rev less.NMI 1800

posted by  Redwood Chair on  Sat Apr 12 18:35 CST 2008
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last visit: Tue Feb 25 21:29 CST 2014
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In short yes you are better off with what you have for freeway travel.

4.30 means the propeller shaft spins 4.3 times to turn the wheels once
4.10 takes 4.10 revs to turn the wheels.
Check the ID plates on the pumpkins,
and or spin the wheels,and count the prop revs.
--
71-145-S ; 72-145-E ; 72-1800-ES







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