I have 4.10 gearing????
Thread Starter
Burning Brakes
Joined: Jul 2001
Posts: 905
Likes: 1
From: New Bern NC
I have 4.10 gearing????
I was thinking to myself while driving the other night that the rpm's seemed really really high. I don't have a tach or a speedo but it was a rough guess. I jacked it up today and the driveshaft spun exactly 4 times for one spin of the tire. I have 25 inch tall tires and in fourth gear a can feel my teeth rattling from the high rpm's. I just punched that into the dragstrip plus program and it said "TOO MUCH GEAR".
DOES ANYBODY HAVE A SIX SPEED THEY WANT TO GIVE ME??
DOES ANYBODY HAVE A SIX SPEED THEY WANT TO GIVE ME??
Burning Brakes
Joined: Oct 2000
Posts: 936
Likes: 0
From: Chicago Illinois
Re: I have 4.10 gearing???? (tworottiedogs)
It could be 4.11 :D Or maybe 3.90. Got access to a GPS? You can do an accurate analysis based on the speed a GPS tells you you are going at, compared with RPM, tire size, and estimated slip. Run it in a few different gears at the same speed (or different speeds).
Rob
Rob
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Re: I have 4.10 gearing???? (tworottiedogs)
Hi
Best method is the one you tried, mark both tires and turn the drive shaft.
If both tires have done exactly 1 full revolution ( with the back on jacks ), you will see exactly if you have 3.90 or 4.11.
Watching RPM versus speed relies on accuracy of your indications.
I agree, both this ratios are too much gear for a 1 to 1 4th gear.
I have 3.70 rear with manual 4 speed ( 4th 1 to 1 ) and hate it on the highway. We both need a good overdrive gear, 5 or 6 speed.
I don't like the idea of installing low rear end gears as this takes the fun of acceleartion away, even on a big block.
Good luck on your surge.
Gunther
Best method is the one you tried, mark both tires and turn the drive shaft.
If both tires have done exactly 1 full revolution ( with the back on jacks ), you will see exactly if you have 3.90 or 4.11.
Watching RPM versus speed relies on accuracy of your indications.
I agree, both this ratios are too much gear for a 1 to 1 4th gear.
I have 3.70 rear with manual 4 speed ( 4th 1 to 1 ) and hate it on the highway. We both need a good overdrive gear, 5 or 6 speed.
I don't like the idea of installing low rear end gears as this takes the fun of acceleartion away, even on a big block.
Good luck on your surge.
Gunther
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: I have 4.10 gearing???? (WESCH)
Ditto.
Throw in some low profile tires and you got some serious high RPM's on the highway. Going 5 speed next year with the 383 stroker. Sucks getting blown by and think 'If I had one more gear!'
Ya Baby! :yesnod: :mad
Throw in some low profile tires and you got some serious high RPM's on the highway. Going 5 speed next year with the 383 stroker. Sucks getting blown by and think 'If I had one more gear!'
Ya Baby! :yesnod: :mad
Safety Car
Joined: Apr 2001
Posts: 4,795
Likes: 1
From: Regina Saskatchewan, Canada.
Re: I have 4.10 gearing???? (Fevre)
4.11's work real well with a .7 overdrive gear for a final drive of about 2.80 which is damn near perfect for a C3 with an engine that can rev. 6500 in OD with 26" tall tires is just over 170mph.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: I have 4.10 gearing???? (Stingy74)
Stingy
I would be afraid to take my car up that high unless I tore it down and re-did everything myslef, or at least checked everything. Of course my speedo is on the fritz so I may have come closer than I think. :lol:
I would be afraid to take my car up that high unless I tore it down and re-did everything myslef, or at least checked everything. Of course my speedo is on the fritz so I may have come closer than I think. :lol:
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Thread Starter
Burning Brakes
Joined: Jul 2001
Posts: 905
Likes: 1
From: New Bern NC
Re: I have 4.10 gearing???? (tworottiedogs)
The tach is in and I took it for a spin. Just over 3000 rpms to keep up with traffic going about 55 - 60. Not an exact figure but that was my guess prior to installing the tach. Definitly need an overdrive. I actually tried to upshift by mistake and there were no more gears left.... :mad