Diff question

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recessbilly
Posts: 147
Joined: Mon Jun 08, 2015 7:22 am
Location: Ashland, OR

Diff question

Post by recessbilly »

I have a 3:89 connected to the 4-speed and I sit at 3100 rpm at 65mph. Would the 3:55 give me more or less speed at that same RPM?

Thanks!!! :not worthy:
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cnicol
Posts: 571
Joined: Wed Jan 20, 2010 8:11 pm

Re: Diff question

Post by cnicol »

3:55 would provide more speed at a given RPM. However... Your numbers don't quite add up based on my experiences. I'd expect 3.89 gears to run the engine pretty close to 4000 RPM at 65. Are you sure about your car's gearing? Are your tires super tall? Not quite adding up...
'61 140 PG Rampside
'66 Rear Alum V8 4-dr
'60 Monza PG coupe (sold, sniff, sniff)
'66 Corsa Fitch Sprint Conv. (First car 1971, recently repurchased)
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