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#53809 12/20/2005 10:19 PM | Joined: Dec 2005 Posts: 5 Junior Member | | Junior Member Joined: Dec 2005 Posts: 5 | I have a 1969 Chevy 4x4 short bed PU and want to change out my married SM 420/Rockwell T-case to a divorced SM465/NP205 T-case. Can anyone help me out as I have little info. on the small (large?) details in doing this. I do recogonize that I'll need to move a cross member but am certain theres much more. Any help is great!!
Thanks,
MaddMatt
P.S. If it mnatters at all, I have a Dana 44 closed knuckle front end, that I'll be changing out with a disc set-up front end of an 80's checvy. | | |
#53810 12/21/2005 9:57 PM | Joined: Dec 2005 Posts: 5 Junior Member | | Junior Member Joined: Dec 2005 Posts: 5 | No one eh? Nobody can offer any advice? Maybe someone knows someone else who may, if so I would really appreciate the advice.
Thanks
MaddMatt | | |
#53811 12/22/2005 3:52 AM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | Just an idea...why not jump up to an NV4500? That way you'd have an overdrive 5th. | | |
#53812 12/22/2005 4:01 AM | Joined: Mar 2002 Posts: 30 Junior Member | | Junior Member Joined: Mar 2002 Posts: 30 | maddmatt,
I'll give it a shot. I think the SM 465 will bolt right in place of the SM 420 however, with the divorced set up you will have to have a new drive shaft made to go between the trans and transfer case, the front shaft will have to be lengthened and the rear shortened. You will have to pay particular attention to driveline angles as you can develop some major driveline vibrations. Make sure the drive shafts are reworked by a reputable shop that specializes in drivelines. They should be able balance the shafts, tell you how to install them in phase and give you an idea of the correct driveline angles.
The biggest concern is the fact you have a short wheelbase vehicle which may not have adequate length to use the divorced set up and achieve correct driveline angles, especially if you intend to add a lift kit.
This is how the oldie 4x4s were built so have a look at some to see what is involved. I have a 1942 Chevy, 1.5 ton Army truck (pictures in the gallery) with the divorced set up; the wheelbase is fairly long and even then the drive shaft between the trans and transfer case is extremely short.
Good luck. | | |
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