PDA

View Full Version : Redline on an fj60?


sgtpeper
03-01-2009, 11:18 PM
Whats the redline on and fj60? Whats the top speed you would comfortably drive a stock fj60 at in 4th gear? And what RPM..

Thanks,

Really making up my mind now :) hehe

rover67
03-02-2009, 07:32 AM
i used (when it had the 2f and 4spd)to cruise in mine at 70 pretty comfortably on long trips.

forget what the redline is... i just shifted when it lost power.

MDH33
03-02-2009, 08:05 AM
My stock 60 drives comfortably at 65 on the flats. Any kind of incline is a totally different story. They are definitely slow.

CardinalFJ60
03-02-2009, 09:05 AM
My stock 60 drives comfortably at 65 on the flats. Any kind of incline is a totally different story. They are definitely slow.

x2 on that.

AND....redline is 4k.

sgtpeper
03-02-2009, 09:31 AM
so isnt 65 pretty much redlining the truck??

60wag
03-02-2009, 08:59 PM
It depends on the tires. With 33's mine would do 75 ..... on level ground.

sgtpeper
03-03-2009, 12:51 AM
Again though, 75 with 33" tires at what RPM??? And with stock tires, what RPM would that be??

Its all about my thoughts on how stressed the engine would be...

60wag
03-03-2009, 05:24 AM
I think it was about 3200 rpm at 75 on 33's with the stock 3.7 gears. Now my '82 sounded like it was going to blow up at 3000 while my '84 with a balanced rebuilt engine seemed fine at 3800 rpm. 33's are about 10% over the stock tire size.

rover67
03-03-2009, 07:39 AM
Mine had 33's on it and ran fine at 70. On long trips where i was pushing it a bit i'd cruise 75 i admit.

My motor was stock with 250k miles on it.

sgtpeper
03-03-2009, 08:55 AM
Can you fit 33s on an fj60 without lifting and causing other problems?

MDH33
03-03-2009, 09:13 AM
Can you fit 33s on an fj60 without lifting and causing other problems?

Depends how flattened the stock suspension is and how skinny the 33's are. I'm running 31x10.50's on flat, stock suspension and they fit well. I've seen 33x9.50's on stock that looked good too.

rover67
03-03-2009, 09:48 AM
i had a mild shackle lift with the stock springs on mine and ran 33 x 10.50's. they worked well and looked great.

subzali
03-03-2009, 12:53 PM
there are rpm charts available online too...stock gearing for an FJ60 differential is 3.73:1, tranny (4th gear) and t-case (high) are both 1:1, and you should be able to find the actual tire diameter so you can punch all that in and find what the rpm will be at all kinds of different speeds.

from my experience, 31s will fill out a stock FJ60 wheel wells nicely, maybe even slightly on the large side. I personally would be concerned with anything larger than that without giving the suspension a little help somehow.

Cruiserdrew
03-04-2009, 07:18 PM
Out of stater checking in here with an opinion....


First of all, the gear ratio is 3.70

Ring gear = 37 teeth, pinion = 10 teeth. Do the math.


Second, the old rule of thumb is to not exceed 3000 rpm for any length of time. I agree with this. You may end up shifting gears at 3200 or so, but I would not hold it there. You will find that the 2F is most comfortable from 2000-2500 rpm. It gets noisy and a bit harsh above that. With stock gearing, unfortunately, 65 mph is close to 3000 rpm, so that's about the comfortable top speed. You will also find that fuel economy declines rapidly after 2500 rpm.

Anyway, treat your 2F gently and with respect and it will run for years more. Don't expect speed, power or high RPM, that isn't what its for.

Trapper50cal
03-04-2009, 09:51 PM
I've got 35's - 4.11's and a 2F......3Grand is about it, and I don't like to stay there...Good news though is that She'll go 70 (at 3K)

Rzeppa
03-05-2009, 05:59 PM
Red Line on F/2F is about 4000 RPM.

I don't have a 60, but all 3 of my 40 series are 4:11 diffs and can do about 85 MPH tops (with either 31s or 33s). Good steering and brakes are kind of important. I routinely hit 75 MPH for extended periods. My main issue is wind noise in a 40, but 60s are much quieter, and with the 3.70 diffs, the 60 will also result in lower RPMs.