URAL 375 - Diesel Conversion

[vtunimog]

I have finally acquired a suitable diesel for my Ural - a Detroit 6V92 , I obviously cannot mate it to the Stock Ural gearbox so I am thinking of a suitable HD gearbox (Eaton, Spicer, Dana,Allison)

will I run into trouble because of the differentials ? what are the axle ratios in this truck ?


Any feedback or ideas are always welcome

[paulob1]

interesting i have just acquired a ford 7.3litre 275bhp diesel engine...this is going into the Ural and I am trying to find an auto box to fit...it will be a great toy...

[vtunimog]

The Ford 7.3 diesel was my first choice but they tend to be hard to find in good working order here in the States so the larger 12.7L Detroit was the next choice. the 8.9:1 axle ratio is going to be tough to overcome though. I am thinking of an Eaton-Fuller 18 speed.

Space should not be a problem as the Ural gearbox is massive.

[paulob1]

ah okay, I have two of the engines just bought them, I am looking for an auto box to go in there...any ideas of a good box. i cannot imagine you need an 18 speed, I would go with an eaton 5 speed overdrive box. if you keep the high low ration box you can then use it easily for everyday use. it will give you night on 70 mph performance and as long as your engine is around 200-220 horsepower you will have plenty of go...and the eaton box is very good, if you must maybe a 9 speed with overdrive but cannot imagine you need that many gears...depends on what you are doing with her...

[vtunimog]

ah okay, I have two of the engines just bought them, I am looking for an auto box to go in there...any ideas of a good box. i cannot imagine you need an 18 speed, I would go with an eaton 5 speed overdrive box. if you keep the high low ration box you can then use it easily for everyday use. it will give you night on 70 mph performance and as long as your engine is around 200-220 horsepower you will have plenty of go...and the eaton box is very good, if you must maybe a 9 speed with overdrive but cannot imagine you need that many gears...depends on what you are doing with her...

Ideally the E40D or 4R100 , I believe the later 4R100 is much more integrated with the electronic controls. I would lean towards a 5 speed if you can. Those Automatics are complex, almost all will need some electronic controls and the older units will either not match up to the performance and torque curve of the Powerstroke or break under the torque. What is great about the Powerstroke is you can literally boost them by nearly a hundred HP in a cheap manner. Plus they are generally speaking reliable.

I think a ZF - 42S 5 speed would work with this engine.


The Eaton 5 speed is a bit hard to find here for some reason although they were put into everything. I am thinking of possibly a 10 speed as the overdrive gear(s) might give me the boost I need to match that low ratio differential gearing via the Transfer case. THe 6V92 will put out around 300 plus HP in it's current state with supercharger and turbo. it's a monster of a motor and will probably snap axles if I am not careful.

[paulob1]

chris that is useful information...I will go looking, are those gearboxes available in the US...

[Zil lover]

The ZF S-42 is plentyful in US market F350 diesel trucks. A great transmission.

[vtunimog]

I have seen a number of wreck yard trucks with this transmission. I can get a quote for a decent one for you. SHipping will be pricey, unless you can wait then it can go via mixed container.

[paulob1]

yes I will search here, but that sounds like a good choice, the zf sounds like a good box and should be able to handle the power and torque...and it will certainly handle the lower revs of the ford engine to give a higher speed than the standard box which is designed for revs up at 3500 rpm. would still prefer an auto box

[K Berg]

The 6v92 needs a few more gears than you would think, they need to be kept in their "happy" rpm band at all times, or it just a heavy gutless lump.
If you could find a 9 or 10 speed, I think it would work very well.

You see these engines with a 5 speed, but they usually have a 2 speed rear axle too.

Paul, the 7.3 should be a very nice engine, I think... Should work great, IMO.

[vtunimog]

The 6v92 needs a few more gears than you would think, they need to be kept in their "happy" rpm band at all times, or it just a heavy gutless lump.
If you could find a 9 or 10 speed, I think it would work very well.

You see these engines with a 5 speed, but they usually have a 2 speed rear axle too.

Paul, the 7.3 should be a very nice engine, I think... Should work great, IMO.

Many THanks for the input, after some long long deliberation and a garage bay stuffed with another project I finally started the removal and measure up process. The 8V92 is way to big for the Ural, the front to rear dimensions are fine but width and weight are a killer. instead I have found a suitable Cummins 6bt series motor that will work quite nicely.

Now what to do with the 8v92?

I will try to post some project photos as things move along.

[paulob1]

the 6bta will be gutless for the ural;, remember the ural is into the 10 plus tons category, bit too much for a 6bta even with 210 BHP..i would have thought anyway...