CRG Discussion Forum

Camaro Research Group Discussion => General Discussion => Topic started by: 69z28302 on October 30, 2011, 04:16:02 AM

Title: 69 12 Bolt with 411 gears
Post by: 69z28302 on October 30, 2011, 04:16:02 AM

I was going to change the gears in 69 and was wondering with a E-70-15 tire what RPM the engine would turn at 55 MPH and 70 MPH with a 4.11 ratio.

Thanks CRG

Mike

Title: Re: 69 12 Bolt with 411 gears
Post by: JohnZ on October 30, 2011, 04:55:46 PM

About 2900 at 55, and 3700 at 70 (E70-15 tire is 26.4" in diameter).

Title: Re: 69 12 Bolt with 411 gears
Post by: MyRed67 on October 30, 2011, 07:59:36 PM

JohnZ;  can you tell me what RPM's I can expect with 255R60 X 15 tires and 4:11 gears at 55 mph and 70 mph?  Thanks!

Title: Re: 69 12 Bolt with 411 gears
Post by: tmodel66 on October 30, 2011, 08:48:49 PM

Around 2800 at 55 and 3550 at 70.  Diameter is 27.1