I am looking to put a 12v in my 86 K20 4x4 but not sure what tranny combination would be easiest and cheapest to go with. Any ideas?.....thanks

 

I think that the easiest swap would be a complete drivetrain from a 91-93 Dodge as that combination will have a NP205 passenger drop for your Chevy. Just fit the drivetrain, motor mounts, trans crossmember and fit the drivelines and 90% of the mechanical is a done deal!

 

Like HRDRKN said, the first gens utilize the NP205's. I personally would use a NV4500 with a NP205, or a 47rh with a NP205. If you plan on not having a lot of power than the getrag 5 speed should be fine as long as you over fill it 1 quart. The first gen autos are non lock up over drive units and 727's with no OD. If your chevy is low geared, which more than likely is, you will want an OD trans and a decent sized tire.

 

will i just have to have a driveshaft shop make custom front and rear drive shaft?

 

Yes. A lot of times you can use parts from the dodge and parts from the chevy and have the drive shaft put it together for you.

 

awesome thanks...sounds pretty straight foreward to me. dont know if i will get around to it or not haha. I recently came up with another idea but havent looked into it much. I have an engine out of a tractor sittin in the shop but havent looked into what it would take to build it for power and most importantly adapt it to a tranny. Im sure you guys really think im crazy now haha

 

It wouldn't be any harder to run GM's 4L80E than run a dodge tranny...you would just have to get the adapter plate to mount it up, and run a standalone computer for the 4L80E to control it. NEVERMIND!!! I believe the transfer case would drop on the wrong side to hook up to the GM front axle...In that case, I'd run a Dodge tranny.

I used the A518 and NP205 combo out of a '93...As stated above...for auto's, your best bet would be an A518 or 47RH as they are not computer controlled. The A518 came from the '91-93 Dodges with the Cummins, and the 47RH was used from '94-98. My first choice there would be the 47RH, as it's got the Lock-Up.

To hook up your front drive shaft, you will need to run a conversion u-joint...then use the stock Dodge front drive shaft. The other option would be to change the pinion yoke to one out of a Dodge front axle. I'll post the conversion u-joint part number when I get a chance to look it up.

To hook up your rear drive shaft, depending on what u-joint you have now...and whether you have a solid drive shaft, or one with a slip joint in it...you shouldn't need to run a conversion joint...You can use your stock shaft (provided the length is right) and a 1410 U-joint to the transfer case.