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Gear Ratio Changes #3197451 12/14/23 12:53 PM 12/14/23 12:53 PM
Joined: Apr 2010 Posts: 38 Memphis, TN M MoparJason0O0 OP member
MoparJason0O0 OP member M Joined: Apr 2010 Posts: 38 Memphis, TN	Wanting to get some advice or examples of anyone changing to Lower gears in 1/8 mile. Info: 1/8 mile only footbrake bracket car Current 4.11 gears 1.80 Powerglide 32x14s Shift at 6700 and cross right around 6700-6800 6.0s at 112mph in 1/8 Any issues going to a 5.00 gear ratio? Thoughts? Last edited by MoparJason0O0; 12/14/23 03:33 PM.

Re: Gear Ratio Changes [Re: MoparJason0O0] #3197453 12/14/23 12:59 PM 12/14/23 12:59 PM
Joined: Jan 2003 Posts: 75,004 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,004 U.S.S.A.	You should ask this in the race forum . What engine, what RPM is the torque and HP peaks ? running up my post count some more .

Re: Gear Ratio Changes [Re: MoparJason0O0] #3197475 12/14/23 02:27 PM 12/14/23 02:27 PM
Joined: Jan 2003 Posts: 15,348 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,348 Omaha Ne	Originally Posted by MoparJason0O0 Wanting to get some advice or examples of anyone changing to Lower gears in 1/8 mile. Info: 1/8 mile only footbrake bracket car Current 4.11 gears 1.76 Powerglide 32x14s Shift at 6700 and cross right around 6700-6800 6.0s at 112mph in 1/8 Any issues going to a 5.00 gear ratio? Thoughts? If I read the above correctly, you're shifting at 6700 and crossing the line at about the same. Going from a 4:11 to a 5:00 is going to have you crossing ~7.5- 8k (rough guess). Can the motor handle that? www.tandmautomotive-omaha.com

Re: Gear Ratio Changes [Re: MoparJason0O0] #3197609 12/14/23 10:55 PM 12/14/23 10:55 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	I would try shifting it out of low at 7000 PM and see what that does to all the times on slips, 60 Ft.' 330 and 660 ET and MPH. If that slows your car down try shifting it sooner, say at 6200 or 6300 RPM out of low gear Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Gear Ratio Changes [Re: Cab_Burge] #3197613 12/14/23 11:07 PM 12/14/23 11:07 PM
Joined: Jan 2003 Posts: 15,348 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,348 Omaha Ne	Originally Posted by Cab_Burge I would try shifting it out of low at 7000 PM and see what that does to all the times on slips, 60 Ft.' 330 and 660 ET and MPH. If that slows your car down try shifting it sooner, say at 6200 or 6300 RPM out of low gear www.tandmautomotive-omaha.com

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