Advice on fj40 shorty

[andrew1]

I am chasing some advice on buying an FJ 40, the current one I am looking at has had a 307 chev put in it with the original running gear (4sp box), can anyone let me know if this mix will allow me to sit on the 100km/hr mark without killing the old girl, we plan to make an odd trip to Fraser but mainly she will be run around the local area.

Any other advice would be greatly appreciated.

[plowy]

to fit a 5 speed would certainly help it from revin so hard at top speed
and gain some sort of fuel econemy at top speed too

[pcman]

or some transfer gears the overdrive/underdrive ones

so high range is like .8 to 1 and low range is lower

prolly work out the same as 5 speed conversion

[andrew1]

Thanks for the reply, is the 5sp a simple bolt off the 4sp and bolt up the 5sp or is there a bit more to it? Also do you know the best place to source a 5sp from?? Thanks again

[plowy]

pcman your right on the money there i had a 3b with a 4 speed runnin 33s and the eng was revin hard at top speed

i converted it to a 5 speed and wacked a set of marks adapter gears the
under n overdrive gears in it

now the eng is not powerfull enough to push the rig allong in 5th gear
but works a treat when in 4th

but they will be removed as im going to fit 35s to the truck so il replace them with just underdrive gears only

as for the 5 speed swap i had to change the input shaft from memory
but another guy on the forum fitted a 5 speed from a 60 series with no prob
only thing you have to do is get the tailshafts to suit wich i did and now have to get the shafts replaced or modded as im extending the wheelbase n fitting 100 series coils n diffs

[DIRTY ROCK STAR]

Just buy it!!!!
V8 40 would rock!! well if its converted well.
checkout what sort of conversion kit, i would be wary of backyard jobs.
maybe for a bit of touring you might be better with a later model diesel middy?

[plowy]

shit forgot the main question is it enginered?

[andrew1]

Yep all engineered and ready to rock, thanks for the advice again

[Ultima RB]

My 2F pushes the FJ40 along at 100km/h no worries with 31's, revs around 2000rpm. Would like an extra gear though. Only problem is the bad aerodynamics causing lots of wind noise. Anyone fitted a truck wind foil to their bonnet? Make much of a difference?

[bad_religion_au]

My 2F pushes the FJ40 along at 100km/h no worries with 31's, revs around 2000rpm. Would like an extra gear though. Only problem is the bad aerodynamics causing lots of wind noise. Anyone fitted a truck wind foil to their bonnet? Make much of a difference?

what gearbox, what diff ratio's... standard, a 4 speed 40 will be turning 2500 -2600 when the speedo reads 100 ks an hour

my biggest concern is the T case, the early 4 speed case is a pain in the ass, i've killed 3 behind a 2f, and one behind a diesel. 1 word, weak

[muddy12]

My FJ40 with 4 spd & 2F, 31in tyres, 4.111 diffs does about 2300rpm at 100kph. Go to 33's & you'll be about 2100rpm which would be pretty comfortable. 35 in tyres will have you cruising at under 2000rpm. A 5 spd would be nice, but bigger tyres gives a decent overdrive with a few other advantages as well.... Just make sure you put disc brakes in first!

[4wheelsdriven]

ive got a fuel injected 5 lt in my cruiser and turbo 700 gear box it does 2100 revs on 100 kph with 33'' tyers V8s the way to go

[Ultima RB]

I tested my speedo against a GPS and there was about 10km/h difference, so I guess my rpm figures were for 90-95km/h. It's a 78 with 4spd std diffs, bad_religion_au. Still fun to drive though.