MPG for 3FE before and after h55 conversion?

[Herbert]

Does anybody have a 5 speed gearbox and a 3FE combo? Did your fuel mileage increase compared to the auto tranny?

 

[Aseif007]

The overdrive ratio is a little better in the A440F (2.94:1) than it is on the H55F (3.11:1). I have just done this conversion and do not have enough miles to comment on my mileage yet. The swap is advatageous to FJ-60 owners since their last gear is 1:1 with a 3.7:1 final ratio.

 

[Dunbar]

I do not bother to check my milage but the final ratio on my 62 with 33" BFG's is very near the A440F with 31's.

I would imagine that there is an increase of a mile or two per gallon bacause the A440F robs lots of power from the 3FE.

I did not do the swap for MPG but to get rid of the damn slushbox.

Just do it and get big tires.

Dunbar

 

[90FJ62]

I do not bother to check my milage but the final ratio on my 62 with 33" BFG's is very near the A440F with 31's.

I would imagine that there is an increase of a mile or two per gallon bacause the A440F robs lots of power from the 3FE.

I did not do the swap for MPG but to get rid of the damn slushbox.

Just do it and get big tires.

Dunbar

When you did your conversion did you keep the vacuam TC or switch to a manual TC?

David

 

[rick_d]

please place mental note to correct

37 teeth on ring and 10 teeth on pinion do not equal 3.73. %$#$$@%!!!

fj60's, some fj40's and some fj55's have this combo, the other option being 37 ring vs 9 pinion equal to 4.11.


H55's do little if any for miles per gallon in FJ60 conversion (had 40,000 on mine) but drivability is night and day. search miles per gallon threads, but 17/18 is tops in a fj60 and typical is 13 mpg highway w/ smog installed.

fj62 has always been slightly less.

 

[Aseif007]

Fixed it for ya. So the overdrive of the H55 vs the 1:1 4th gear of the H42 makes no difference at all on fuel efficiency? What about on the freeway? It seems to me that lower RPMs on the freeway would equal a little better gas mileage?

please place mental note to correct

37 teeth on ring and 10 teeth on pinion do not equal 3.73. %$#$$@%!!!

fj60's, some fj40's and some fj55's have this combo, the other option being 37 ring vs 9 pinion equal to 4.11.


H55's do little if any for miles per gallon in FJ60 conversion (had 40,000 on mine) but drivability is night and day. search miles per gallon threads, but 17/18 is tops in a fj60 and typical is 13 mpg highway w/ smog installed.

fj62 has always been slightly less.

 

[Dunbar]

When you did your conversion did you keep the vacuam TC or switch to a manual TC?

David

Kept the FJ62 Tcase with the vacuum actuated engagement. Works on the fly!

For more info search for Dunbar and H55F and you will find my full write up.

Cheers,

Dunbar