Has anyone done this before ??????

[mysteryman]

Has anyone out there ever converted a 1972,73 or 74 Dodge W300, standard cab long bed 4wd 4spd gas truck that has a divorced transfer case over to a Cummins with a Getrag 5spd trans????



What I would like to do is leave the divorced case where it is ... But it seems like I will not have enough space left to get the intermediate drive shaft in between the trans and the transfer case after installing the cummins/getrag...



If anyone has ever successfully done a cummins/getrage conversion of a gas truck and been able to keep the divorced t/case please do let me know how you did it. Thx... ///Terry

 

[DKarvwnaris]

Has anyone out there ever converted a 1972,73 or 74 4wd gas truck that has a divorced transfer case over to a cummins with a Getrag 5spd trans????



What I would like to do is leave the divorced case where it is ... But it seems like I will not have enough space left to get the intermediat drive shaft in between the trans and the transfer case after installing the cummins/getrag...



If anyone has ever sucessfully done a cummins/getrage conversion of a gas truck and been able to keep the divorced t/case please do let me know how you did it. Thx... ///Terry

What brand, model truck?..... Dodge, Ford? They both had this set up.

Is it a standard cab, ext cab, crew cab, long bed, short bed? This makes a huge difference in useable driveline length. You can move the divorced transfer case backwards with no problems if its an longer wheelbase truck. Dropping the transfer case down will also give you an easier shaft degree angle to contend with.



While a divorced transfer case is fine, I would not use a boat anchor like a getrag for anything but a gas powered 1/2 ton. You are far better off spending the money on a nv-4500 now than later.

To fit the intermediate shaft is dependant on original transmission tailshaft location verses the new transmission's position once installed.

A 300 inline six ford engine was common in their trucks, they were similar in dimensions to the 6bt with all their accessories installed. a difference of about 5" if I remember right in overall length. This will not be too hard. Dodge had a few slant six engines those years that were of near similar dimensions. Main difference is the tailshafts of these trucks were fixed, not slip yoke types like the getrag/nv-4500 of recent model years. I remember a few aftermarket companies selling fixed yoke conversions for several 2wd transmission's.

With more info from you, its alot easier to help you. I have built several mud runners on the older trucks like the years you are asking about, just need to know which you're dealing with to get specific. All were refitted with different drivetrains than stock, most had relocated transfer cases by the time I was done.

 

[Desperado]

Looks like it should be a Dodge (W300) I don't recall Ford using a W in their line up.

 

[DKarvwnaris]

Looks like it should be a Dodge (W300) I don't recall Ford using a W in their line up.

Upon the posters edit, yes it does say w-300, not originally



You are going to have a very difficult time getting a standard cab long bed to accept this setup.

You will be able to move the transfer case back maybe 6", much more than that and you will have worse driveline angles than a comparable shortbed chassis.

There is not much room to gain forward for the engine since the older dodge bodies are just as tight in the engine bay with the cummins as the 89-93 models were, You can gain maybe 1" to 2" if you modify the core support to move the engine forward, but you'll put even more weight on the front axle and not really gain much to speak of after alot of work to get there.

An extended cab will be a much more viable option, but I doubt that will be of much help to you as I am betting the reason you want to use this truck and power train is you already have it.

The cost to find a fixed yoke conversion for the getrag or Nv-4500 will quickly suck up any savings in just changing the tail section of the transmission over to a 4wd assembly and mounting a 205 out of a 89-93 4wd ram diesel. I've found the 205's for as little as $200 in useable condition, a rebuilt one is up in the $800 or higher range. Lots of older dodge parts on here for sale though, so you may end up lucky.

 

[mysteryman]

I figured that I would be changing to a married getrag/205... . If anyone has one that they don't need please let me know... . I will also need the cross member as well . . This is going to be a major pain in the rear ! But If I want to use the truck it has to be done..... They don't make gas anymore that will run this truck... It is too heavy and just burns up engines in the summer months ..... And lets not forget that it get 6 mpg on high test . It weigh's in at 7880 lbs empty. .

I have had this truck for over 30 years... It has 700K + on it now.....

It is actually a cab/chassis 135" wheel base ... It has a 9 foot "utiline" bed on it. I got the truck when I was at Chrysler... .



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Upon the posters edit, yes it does say w-300, not originally



You are going to have a very difficult time getting a standard cab long bed to accept this setup.

You will be able to move the transfer case back maybe 6", much more than that and you will have worse driveline angles than a comparable shortbed chassis.

There is not much room to gain forward for the engine since the older dodge bodies are just as tight in the engine bay with the cummins as the 89-93 models were, You can gain maybe 1" to 2" if you modify the core support to move the engine forward, but you'll put even more weight on the front axle and not really gain much to speak of after alot of work to get there.

An extended cab will be a much more viable option, but I doubt that will be of much help to you as I am betting the reason you want to use this truck and power train is you already have it.

The cost to find a fixed yoke conversion for the getrag or Nv-4500 will quickly suck up any savings in just changing the tail section of the transmission over to a 4wd assembly and mounting a 205 out of a 89-93 4wd ram diesel. I've found the 205's for as little as $200 in useable condition, a rebuilt one is up in the $800 or higher range. Lots of older dodge parts on here for sale though, so you may end up lucky.

 

[TKingsbury]

Why not just move the t-case back a bit to get a useable length for the jack shaft? You should have plenty of wheelbase to do this. And since your truck is not lifted it should not really impact your driveline angles.

Travis. .

 

[DKarvwnaris]

I figured that I would be changing to a married getrag/205... . If anyone has one that they don't need please let me know... . I will also need the cross member as well . .

You really need to look for a nv-4500 4wd transmission and a 205 transfer case. The NV-4500 will directly bolt to the dodge 205 transfer case with just a spline coupler swap out. The bellhousings are different, but you can a retrofit bellhousing from advanced adapters. Personally, I would just scrounge up all 94 and newer nv-4500 bellhousing parts so you can use factory dodge parts. The hydraulic clutch assembly is going to the same for either one, the slave cylinder from a getrag transmission will bolt right up to a nv-4500 bellhousing.

If you want a useable getrag transmission, I sold off my used one to Rocky Mountain truck in Great Falls, MT (406 452 8561) It was a working transmission, I just didn't have any faith in it to make trips from Montana to Oregon every week. They get used ranch trucks in from time to time, so you may be able to find all the parts you need through them.