Convertor slip and gear change 1/4 to 1/8

[Stan Weiss]

I have always run a manual trans.


Based on one person I know. Making only a change to a lower gear ratio reduced his convertor slippage.



Stan

[Tom Goldman]

Making a change from a 4.29 rear gear to a 4.56 gear reduced slip on my converter from 12% down to 5 1/2% . of course the converter flash stall dropped about 300 rpm .
overall trap rpm increased 200 rpm and MPH increased by 2 MPH.

[Jeff Stout]

My bracket car had 4.30 gears and went to 4.88 converter is 500 tighter on leave and 10% slip at 1/8 mile. Down from 13% car runs 6.50 in 1/8

[DailyDriverSst]

Originally Posted by Tom Goldman

Making a change from a 4.29 rear gear to a 4.56 gear reduced slip on my converter from 12% down to 5 1/2% . of course the converter flash stall dropped about 300 rpm .
overall trap rpm increased 200 rpm and MPH increased by 2 MPH.

Originally Posted by Jeff Stout

My bracket car had 4.30 gears and went to 4.88 converter is 500 tighter on leave and 10% slip at 1/8 mile. Down from 13% car runs 6.50 in 1/8

This is exactly the info I was hoping to hear. I'd feel better having more-common 4.88 instead of 4.71. It sounds like the slip difference will be sufficient enough to make the former work.

Thank you for the feedback.