Automatic vs manual gear box
#1
Automatic vs manual gear box
Hello every one
I have a fzj80L gnpeka with
- a442f automatic gear box
- 4.55 deffrential ratio (standard tier size 275/70 R 16 ) which I modified original is 4.11 ratio
- part time conversion with dash switch installed
- front weel hubs
I have problems with the automatic gear box so I thought of shifting to manual gear H151F 5 speed.
My concern is the 5th gear ratio in the manual is 0.881 :1 which I think will reduce the car general speed even more than what it is after my reduction from 4.11 to 4.55 deffrential ratio
In the A442F the 4th gear ratio is 1:0.756
Has any one done this shift to manual and faced this problem of general speed reduction
Thanks a lot
I have a fzj80L gnpeka with
- a442f automatic gear box
- 4.55 deffrential ratio (standard tier size 275/70 R 16 ) which I modified original is 4.11 ratio
- part time conversion with dash switch installed
- front weel hubs
I have problems with the automatic gear box so I thought of shifting to manual gear H151F 5 speed.
My concern is the 5th gear ratio in the manual is 0.881 :1 which I think will reduce the car general speed even more than what it is after my reduction from 4.11 to 4.55 deffrential ratio
In the A442F the 4th gear ratio is 1:0.756
Has any one done this shift to manual and faced this problem of general speed reduction
Thanks a lot
#4
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The combination of going from 4.11 to 4.56 gears and changing the transmission ratio from 1:756 to 1:881 will give you a 29% change in your top gearing. If, for example, before you were running 3000 rpm at 70mph, after the two changes it would require 3870 rpm for the same speed. That's a pretty big change, and you're right to be thinking twice about it. Maybe change to bigger tires at the same time to better match the new gearing.
Ron
Ron
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