whats the best standard transmission

[ODdave]

If you want a 6 speed, dont waste your time on a 5600. Get a G56. The G56 didnt bankrupt anyone like the 5600.

 

[doghead]

Will the NV4500 take 800 hp?

I'm sure the final drives on a HMMWV will not.

 

[91W350]

Will the NV4500 take 800 hp?

I'm sure the final drives on a HMMWV will not.

If he has enough money to build an 800 HP 4BT, why does he care what transmission he destroys? I have been around some really bas azz 6BTs tbat were nowhere near 800 HP. We are talking over 1200 foot pounds.....

 

[doghead]

this category said not to disclose the specific vehicle

Where is this posted?

This Forum is not vehicle specific(meaning you can discuss engines and drive train for any vehicle). You do not need to keep it a secret.

With out specific vehicle information, obviously it is difficult to offer advise.

 

[jjramrod]

To oddave I thought the g56 could not handle the power at least from what I read. Whichever transmission I choose it will be custom built to handle more hp and torque than it will have. To doghead I don't plan to turn the motor up to 800 hp but its nice to know its possible. I will be turning this up. But only to the point of finding a good balance of power and mileage. My last souped up truck had so much torque you almost couldn't shift it fast enough. I kind of miss that one. it would wup a porsche all day long. Sold it to get this project going.

 

[ODdave]

G56 came behind the highest powered/torque cummins available. I would think your lil 4b isn't gonna hurt it.

 

[jjramrod]

I read some articles on line that since they have started using the g56 there have been many problems and isn't it also aluminum? I've seen many broken ones for sale on line.

 

[jjramrod]

Im open to any suggestions if you can show me articles or stats and most importantly experience that proves that it will last and is rugged.

 

[ODdave]

If you have been reading then you know the issue with the 5600 as well.

Sorry but to me this is sounding like a pipe dream. in all reality what are the numbers you are wanting out of this engine? What are you doing to the final drives to make them handle the power? All of the transmissions mentioned will last far longer than the rest of the drivetrain.

 

[jjramrod]

In all reality. I will probably not go any higher than 300 hp if I go that far. This is not a pipe dream. I have the vehicle and the motor already the drive train has all heavy duty hubs and axle shafts all I need is a transmission and the components to make it work. I plan on getting this done this summer and want to have everything bought and ready to assemble by spring. I just like to have real world advice and experience from others before I make my final decision on a transmission. As I don't want any regrets when im done. thanks

 

[ODdave]

All 3 will handle that in stock form without a problem. if it where me I would use a late GM 4500 with a dodge input & bearing retainer. that way you have the more adaptable 32 spline output.

 

[mudguppy]

I'd go with the NV4500 - it's super-proven to handle way more than it's rated (and, yes, they've even been behind 800+hp 5.9s).

The second reason I'd go with the '4500 is availability. The '5600s are in farely limited supply; of that supply, there are several versions and a couple of those versions had reliability problems. Whereas there are tons of '4500s...

However, if you want a 6 speed and have the room, then I'd go with the Ford ZF6; stronger than the '5600 or '4500 (or G-units, for that matter), are in fewer (more standard) configurations and are overall much more widely available (Ford diesels 1999-2008, with most common behind the 7.3s from '99-'03). The ZFs aren't cheap, but you'll be hard pressed to kill 'em.

Otherwise, build a '4500 with Dodge input shaft and GM fixed yoke short tail shaft with 1410 yoke output; this yields the correct input for the Cummins up front, a more reliable rear output (no 5th gear issue), and a shorter overall package. This is what I did...

 

[ODdave]

Pretty shure he's gonna want a 4wd not 2wd

 

[jjramrod]

Does the ford zf6 mate up to a good gear driven transfer case something like the np205. Except that goes off the drivers side instead of the passenger side.

 

[ODdave]

Ford 205 is drivers drop.......

 

[jjramrod]

Thanks for the info ill be going to get one now. Will that mate up to the zf6 though?

 

[ODdave]

Should as far as I know ford only used 1 spline count on there 4x4's and that was 31. you may have to notch the trans for the shifter.

Your next task finding an adapter to go to the zf. Destroked probably makes them but I was far less than impressed the last time I talked to them.

 

[jjramrod]

From what I read im more leaning toward the nv4500. According to what I read on wikapedia and 4bt swap the ford version has problems.
1 has an oil cooler
2 has oil pump
3 has 2 and 3the shift problem pops out of those gears
4 shifts hard like stirring asphalt in a bucket
5 shift forks bend
6 excessive bearing noise
And the gm version only solved half of those.

 

[ODdave]

Yea....ZF trans are notorious for problems, But I was gonna leave that alone to avoid an argument.......

4500 is the easiest.

 

[jjramrod]

So at this point sounds like ill be doing a nv4500 with a dodge input shaft mated to a ford np 205 transfer case.