FMTV High Speed Gears

[Awesomeness]

You want a FMTV to drive on the interstate at 75mph? That’s not what they’re for. Think about the planetaries; the tires exploding; the fuel consumption.
From my perspective these things are for bad road camping vehicles or whatever. 60mph on the highway is more than fast enough. Yeah fast gearing is great to get rpms down. Especially since the bolt on Marmon Herrington MVG-1150 transfer case has an unfortunate high range ratio of 1.09.

With the 3.07:1 gears it will only do 72MPH, but it's fine doing that, if you have the Goodyear tires. 60MPH is at high RPM in the 6th gear, so you don't want to do that any more than you want to run at 72MPH, really. I find that 65MPH is a really nice cruising speed, low into the 7th gear RPM (it switches up to 7th at 60-62MPH). The planetaries are fine at all these speeds.

If you're going to be driving at max speed, for whichever gears you have, make sure your driveshafts are balanced.

 

[Mavcaster]

Ugh, read the whole thread to get a better understanding of the swap and this book had a terrible ending. Looks like I’m a few years late on this…guess I’ll start looking for shop that can install an R&P.

 

[Keith Knight]

What were you hoping for?

 

[Mavcaster]

Some in stock carriers at a reasonable price that I can install myself…

 

[Keith Knight]

Yeah the reasonable price ship sailed long ago.
But you can install them and save money.

 

[Mavcaster]

Yeah the reasonable price ship sailed long ago.
But you can install them and save money.

Haha well you're not wrong.

 

[Schmirgel]

Hello everyone,

this thread is older - but it's about a topic that interests me too. We would also like to convert our M1078 4x4 to 3.07 differentials. Is there anyone in Germany or the surrounding area who offers this as a workshop?

 

[ramdough]

Hello everyone,

this thread is older - but it's about a topic that interests me too. We would also like to convert our M1078 4x4 to 3.07 differentials. Is there anyone in Germany or the surrounding area who offers this as a workshop?

@Berend is the closest person I can think of.


Sent from my iPhone using Tapatalk

 

[Xengineguy]

Hello everyone,

this thread is older - but it's about a topic that interests me too. We would also like to convert our M1078 4x4 to 3.07 differentials. Is there anyone in Germany or the surrounding area who offers this as a workshop?

Hi Schmirgel, I don’t know if you know about Eco Hubs. They replace the 2:1 gear reduction units with direct drive. I’m going to be listing Eco Hubs for sale on a popular auction site . That site I’m told has very good rates on international shipping.
The listing will be for one axle, so if you have a 4x4 you will need to make two separate purchases. ( They have a 2500.00 dollar limit
for over sea’s per purchase) Eco Hubs are very easy to install and work much better than 3:07 gears. Cheeper too!
PM me with any questions.

 

[Berend]

@Berend is the closest person I can think of.


Sent from my iPhone using Tapatalk

I have a set of 3.07 in the Netherlands

 

[Schmirgel]

I have a set of 3.07 in the Netherlands

I somehow can't start a private conversation right now - you are welcome to try with me.
Do you also install the differentials? And is it just the gears or the whole differentials?

Greets

 

[Schmirgel]

Hi Schmirgel, I don’t know if you know about Eco Hubs. They replace the 2:1 gear reduction units with direct drive. I’m going to be listing Eco Hubs for sale on a popular auction site . That site I’m told has very good rates on international shipping.
The listing will be for one axle, so if you have a 4x4 you will need to make two separate purchases. ( They have a 2500.00 dollar limit
for over sea’s per purchase) Eco Hubs are very easy to install and work much better than 3:07 gears. Cheeper too!
PM me with any questions.

Hi Xengineguy,

I somehow can't start a private conversation right now - you are welcome to try with me.
I don't know the ECO Hub yet - please send me more information

Greets

 

[Berend]

I somehow can't start a private conversation right now - you are welcome to try with me.
Do you also install the differentials? And is it just the gears or the whole differentials?

Greets

I somehow can't start a private conversation right now - you are welcome to try with me.
Do you also install the differentials? And is it just the gears or the whole differentials?

Greets

It’s new complete diffs, install is possible. Just send you a PM

 

[Ronmar]

You need a certain number of posts in this forum before you can initiate direct messaging. Cuts down on spammers who creat accounts immediately having access to the entire member list…

 

[coachgeo]

You need a certain number of posts in this forum before you can initiate direct messaging. Cuts down on spammers who creat accounts immediately having access to the entire member list…

@Schmirgel think it is only 5 post though. (same for posting pics or links) You may be there now though