Gear ratio assistance

[Pezzer]

Hi all, could anyone please advise the diff ratios I should be looking at for my Shorty, mainly hway pulling boats, this is the rubber currently fitted....

[Stropp]

might help if you say what ratio you have now?? and if its petrol or deisel

[threedogs]

Your VIN plate will tell you what diff you have now,
20" rims eh

[Pezzer]

Hi its a tb42 at the moment but am converting to TD42, Ford Maverick Vin doesn't show ratios at all my mates GQ does...

[Stropp]

ok it will be hard to work out then but i would say off the top of my head 4.1 or 4.3, i have 315 tyres on my td42 and have 4.3 diff gears

[Winnie]

Those tyres are only a tiny bit bigger than what comes factory, so I would not worry about changing ratios.

[Clunk]

Those tyres are only a tiny bit bigger than what comes factory, so I would not worry about changing ratios.
yep I agree, they're only approx 32" tyres

[Pezzer]

Well when Im doing 110kph Im only on 1800revs and its gutless going up hill especially when towing...

[BigRAWesty]

Well when Im doing 110kph Im only on 1800revs and its gutless going up hill especially when towing...

That's really low

[Clunk]

Well when Im doing 110kph Im only on 1800revs and its gutless going up hill especially when towing...

That's normal for a TB42, I'm guessing yours is a manual, which I believe the diff ratios are 4.1........ the TD42 manuals are also 4.1

If yours is an auto, then the diff ratios should be 3.9 and turn the overdrive off if towing, it'll be a bit more spritely

[BigRAWesty]

That's normal for a TB42, I'm guessing yours is a manual, which I believe the diff ratios are 4.1........ the TD42 manuals are also 4.1 If yours is an auto, then the diff ratios should be 3.9 and turn the overdrive off if towing, it'll be a bit more spritely

Really. That's a huge difference as mine is close to 2800 at 100km/h

[Clunk]

Really. That's a huge difference as mine is close to 2800 at 100km/h

no, I thought I'd just make it up for the hell of it

[BigRAWesty]

no, I thought I'd just make it up for the hell of it
Who would know with you lol.

[Pezzer]

Mine is Auto and that is with Overdrive off, box has been checked and is A1...

[Clunk]

Who would know with you lol.

Well i do own both numbnuts

[Winnie]

Mine revved more than that Clunk, do you think that would be the difference between the auto and manual?

[Clunk]

Mines an auto too and just checked, its actually got 4.1 diffs. I haven't driven it for a while but i remember it used to rev at about 1800rpm at 110kph with the overdrive on and about 2200 with it off. Thats running on 33s.
So whether they ran different ratios in the Mavs, i really dont know.

Oh and Kallen, my TD42 runs at 2400rpm at 110kph in 5th gear.

[Winnie]

Is the auto overdrive equivalent to the 5th gear in the manual? Mine revved at about 2400 the same as my TD42

[Clunk]

Is the auto overdrive equivalent to the 5th gear in the manual? Mine revved at about 2400 the same as my TD42

Yeah basically a 4 speed box

[Stropp]

With the 3.9 mine was 2100 at 100 kph now with the 4.3 it's about 2600 on 35's

[BigRAWesty]

My apologies. Was to used to the farked dash lol.
But yea 2400rpm at 100kmh

[nissannewby]

Yeah basically a 4 speed box

The auto will be lower in engine rpm due to its nature. The td42 auto we have sits on less than 2000rpm with 31's unsure on thw ratio would have to look but would lnly be 3.9 or 4.1