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LEGENDS => Drivetrain & Gearing => Topic started by: MG173 on October 14, 2016, 06:38:57 pm

Title: What gear??
Post by: MG173 on October 14, 2016, 06:38:57 pm

The used car I bought came with 2.5, 2.92, and 3.58 gears plus whatever is already in the car but that's the problem. Is there any way to check what gear is in it without actually having to take it apart? i'm taking it out for the first time to tucson speedway here in arizona and it calls for a 3.90. If that's not whats in the car what would my next best option be?

Title: Re: What gear??
Post by: RPM on October 14, 2016, 07:57:04 pm

Mark the drive shaft and rear tire.I mark the rear tire and driveshaft at the 12 o'clock position. Count the amount of rotations the driveshaft goes around in once full rotation of the tire. If it goes around just short of 4 then you have a 3.90. If 3 and 3/4 then you have a 3.73

Randy - RPM (http://www.rpmracingca.com)

Title: Re: What gear??
Post by: MG173 on October 15, 2016, 08:36:34 pm

I believe its a 3.33. what is the best gearing options for the ones I have for 3/8 miles asphalt track?

Title: Re: What gear??
Post by: justfreaky on October 16, 2016, 01:22:54 am

I would say 3.58 in 4th gear.
Unless you plan to do some road racing, the 2.50 and the 2.92 won't be of much use to you.
You can likely sell them for a decent price and buy a 3.90 and still have some extra cash in your pocket.
Just be sure you buy a ten bolt gear and not an 8 bolt gear.

Steve

Title: Re: What gear??
Post by: MG173 on October 17, 2016, 10:56:18 pm

That's what I figured, the guy I bought it from mostly did road racing. How do I tell if the gears are welded or spooled so I can gauge what kind of price to sell them for?

Title: Re: What gear??
Post by: justfreaky on October 17, 2016, 11:09:24 pm

A spooled gear will look like this:

Title: Re: What gear??
Post by: justfreaky on October 17, 2016, 11:27:32 pm

A welded gear looks like this:

Title: Re: What gear??
Post by: dirkhenry3 on October 18, 2016, 10:16:31 am

PM sent

Title: Re: What gear??
Post by: MG173 on October 20, 2016, 10:26:16 am

Thanks for all your help guys! I believe my gears are welded.