ZF6 swap questions - Dodge Cummins Diesel Forum
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post #1 of 42 (permalink) Old 06-26-2019, 07:37 PM Thread Starter
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ZF6 swap questions

Haven’t found much in the way of a build thread on doing this swap but I know there’s a few out there that have done it and I get the gist of it all. I’ve located a 4x4 ZF6-750 in the area I’m hoping to pick up in the next few days then start amassing the rest of the parts.

My main question is about the transfer case. I see most people put a np271 manual shift in behind the ZF6 but I’m not having luck finding one for a decent price, the ones I’ve been finding are more than I’ll be getting the trans for. Question is, I know the np271 is a common drop in mod to throw in behind the nv4500, so I should be able to just use the np241,with extended linkage, I already have to put behind the ZF6 correct? Input size/splines and mounting pattern should be the same right? I know the 271 is stronger but if I can hold off on finding one cheaper than the $1400 going rate I will.

Rest of the parts list needed to order so far:

- conversion flywheel and clutch (Southbend)
- conversion hydraulics (Southbend)
- adapter plate (wild horse Mfg)
- 6.0L ford starter
- modify driveshafts
- modify or fabricate trans crossmember
- oil cooler system for trans

If anyone else who’s done this has suggestions on the crossmember and cooling system please chime in.


1996 2500 ECLB, NV4500, 4X4
Engine: 24 Valve P-Pump Swapped,
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, Adj. Timing Gear @ 20*, Haisley L19 studs, DAP 3 Piece Mani, Fluidampr, Southbend DD3250, 5" Exhaust+FTE Resonator
Air: HE351VE w/ Banshee Controller
Fuel: 215HP P7100, Infinite Performance 6x11 VCO, Scheid Conversion Lines, PDD 055s, AirDog II 165, Dual Feed, #0 plate, 4K GSK
Suspension: Thuren 3" Coils, Thuren Sway Bar, DOR Track Bar, DOR Shackle Flip, DOR Extreme Bent Long Arms, Synergy Steering, Fox 2.0 IFPs, Yukon Hub Conversion, Dynatrac BJs, 37x12.5x17 Toyo M/T's on H2s

Last edited by colin91; 06-27-2019 at 02:48 PM.
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post #2 of 42 (permalink) Old 06-26-2019, 07:54 PM
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Why not just find a NV5600? it's stronger and doesn't have the gated reverse/low on the left, which i hate personally. Pus the NV5600 will reuse your current cross member and you should be able to find factory linkage and a married set up with a NV5600/271 ready to go. Seems easier to me, i did the swap on my 02 back in the day and i loved it. (originally an auto) kinda wish i still had that truck....

Not sure what current rates are, but i know when i did my swap i got the married conversion, with a bunch of extra parts for around $2000. This would've been maybe 8-9 years ago though.

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post #3 of 42 (permalink) Old 06-26-2019, 08:25 PM Thread Starter
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@Loki223 compared to a no the ZF6 is better designed, stronger, parts are more available/cheaper and I don’t have to pay an arm and a leg to put the correct oil, that isn’t made anymore, in it. Gated reverse and low doesn’t bother me. Driven many trucks with far worse patterns and transmissions in general.

For what I can get this ZF6 for I would be a shame to pass it up

1996 2500 ECLB, NV4500, 4X4
Engine: 24 Valve P-Pump Swapped,
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
, Adj. Timing Gear @ 20*, Haisley L19 studs, DAP 3 Piece Mani, Fluidampr, Southbend DD3250, 5" Exhaust+FTE Resonator
Air: HE351VE w/ Banshee Controller
Fuel: 215HP P7100, Infinite Performance 6x11 VCO, Scheid Conversion Lines, PDD 055s, AirDog II 165, Dual Feed, #0 plate, 4K GSK
Suspension: Thuren 3" Coils, Thuren Sway Bar, DOR Track Bar, DOR Shackle Flip, DOR Extreme Bent Long Arms, Synergy Steering, Fox 2.0 IFPs, Yukon Hub Conversion, Dynatrac BJs, 37x12.5x17 Toyo M/T's on H2s
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post #4 of 42 (permalink) Old 06-26-2019, 08:28 PM
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Just buy an nv5600? Good one. Everyone wants them buggers now that that guy in Texas makes them bang gears.
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post #5 of 42 (permalink) Old 06-26-2019, 08:56 PM
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Destroked450 is who you need to talk to he has a zf6 behind a Cummins, I have a zf5-42 behind one of my Cummins and I wound't swap it out for a NV.

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post #6 of 42 (permalink) Old 06-26-2019, 10:09 PM
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Just curious for my own knowledge - whatís the advantage of swapping to a zf6 or nv5600 vs going with a gear vendors overdrive? Iíve thought about going that route with my 96. Thx.

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1996 2500 NV4500 SLT Regular Cab (purchased new)
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post #7 of 42 (permalink) Old 06-27-2019, 12:49 AM Thread Starter
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Quote:
Originally Posted by beyler View Post
Just curious for my own knowledge - whatís the advantage of swapping to a zf6 or nv5600 vs going with a gear vendors overdrive? Iíve thought about going that route with my 96. Thx.
Stronger transmission. And overdrive doesnít do anything to help the transmission power wise
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1996 2500 ECLB, NV4500, 4X4
Engine: 24 Valve P-Pump Swapped,
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
, Adj. Timing Gear @ 20*, Haisley L19 studs, DAP 3 Piece Mani, Fluidampr, Southbend DD3250, 5" Exhaust+FTE Resonator
Air: HE351VE w/ Banshee Controller
Fuel: 215HP P7100, Infinite Performance 6x11 VCO, Scheid Conversion Lines, PDD 055s, AirDog II 165, Dual Feed, #0 plate, 4K GSK
Suspension: Thuren 3" Coils, Thuren Sway Bar, DOR Track Bar, DOR Shackle Flip, DOR Extreme Bent Long Arms, Synergy Steering, Fox 2.0 IFPs, Yukon Hub Conversion, Dynatrac BJs, 37x12.5x17 Toyo M/T's on H2s
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post #8 of 42 (permalink) Old 06-27-2019, 03:54 AM
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Someone tell if I am wrong, but I don't believe the NV5600 requires special lube. The NV4500 most certainly does!

1995 RAM2500 Club Cab Laramie SLT 2 W/D 5.9 P-Pump w/ NV4500 3.54 Dana 80. Nearly stock. Timed @ 15.5* Currently 317,000 miles and counting.
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post #9 of 42 (permalink) Old 06-27-2019, 04:19 AM Thread Starter
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Quote:
Originally Posted by dd453ford View Post
Someone tell if I am wrong, but I don't believe the NV5600 requires special lube. The NV4500 most certainly does!
Factory mopar recommendation is the same oil as a nv4500. Considering the quick synchro failures I’ve seen on 4500 running the wrong stuff I’ll take their word for it on the 5600 too

1996 2500 ECLB, NV4500, 4X4
Engine: 24 Valve P-Pump Swapped,
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
, Adj. Timing Gear @ 20*, Haisley L19 studs, DAP 3 Piece Mani, Fluidampr, Southbend DD3250, 5" Exhaust+FTE Resonator
Air: HE351VE w/ Banshee Controller
Fuel: 215HP P7100, Infinite Performance 6x11 VCO, Scheid Conversion Lines, PDD 055s, AirDog II 165, Dual Feed, #0 plate, 4K GSK
Suspension: Thuren 3" Coils, Thuren Sway Bar, DOR Track Bar, DOR Shackle Flip, DOR Extreme Bent Long Arms, Synergy Steering, Fox 2.0 IFPs, Yukon Hub Conversion, Dynatrac BJs, 37x12.5x17 Toyo M/T's on H2s

Last edited by colin91; 06-27-2019 at 02:47 PM.
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post #10 of 42 (permalink) Old 06-27-2019, 08:18 AM
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Quote:
Originally Posted by beyler View Post
whatís the advantage of swapping to a zf6 or nv5600 vs going with a gear vendors.
Gear vendors are known to fail under deceleration load, such as towing heavy with an exhaust brake.

Quote:
Originally Posted by Loki223 View Post
Why not just find a NV5600? it's stronger .
The nv5600 is strong (550-600 ft lbs. ) but not as strong as the Zf-6 (650-750). Also parts availability is getting scarce for the 5600. Plus a Zf-6 is over a hundred pounds lighter. And it has a center bearing on the main shaft. Having run both (towing) Iíll take the Zf-6 hands down.

Quote:
Originally Posted by colin91 View Post
Havenít found much in the way of a build thread on doing this swap but I know thereís a few out there that have done it and I get the gist of it all. Iíve located a 4x4 ZF6-750 in the area Iím hoping to pick up in the next few days then start amassing the rest of the parts.



My main question is about the transfer case. I see most people put a np271 manual shift in behind the ZF6 but Iím not having luck finding one for a decent price, the ones Iíve been finding are more than Iíll be getting the trans for. Question is, I know the np271 is a common drop in mod to throw in behind the nv4500, so I should be able to just use the np241,with extended linkage, I already have to put behind the ZF6 correct? Input size/splines and mounting pattern should be the same right? I know the 271 is stronger but if I can hold off on finding one cheaper than the $1400 going rate I will.



Rest of the parts list needed to order so far:



- conversion flywheel and clutch (Southbend)

- conversion hydraulics (Southbend)

- adapter plate (wild horse Mfg)

- 6.0L ford starter

- modify driveshafts

- modify or fabricate trans crossmember

- oil cooler system for trans



If anyone else whoís done this has suggestions on the crossmember and cooking system please chime in.

Iíve heard that you can change out the input on a dodge 271 to ford and itíll work. The plus is you can then run a 1 piece aluminum drive line.
The easiest way for me was to fab a new cross member. I wanted to keep the drivetrainís attitude as close to stock as possible so downpipe clearance gets pretty tight. Had to massage the seam on the cab floor a little and put a small indent on the 4Ē pipe.

I just mounted a cheap cooler on the frame rail and it works fine. I donít have a trans temp gauge but Iíve done the hand test after a hard pull and itís fine.




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post #11 of 42 (permalink) Old 06-27-2019, 10:46 PM Thread Starter
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Well I picked up the ZF6 today. Looks solid, spun all the gears by hand with no issues, I'm still going to look into splitting the case for a closer inspection though

1996 2500 ECLB, NV4500, 4X4
Engine: 24 Valve P-Pump Swapped,
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
, Adj. Timing Gear @ 20*, Haisley L19 studs, DAP 3 Piece Mani, Fluidampr, Southbend DD3250, 5" Exhaust+FTE Resonator
Air: HE351VE w/ Banshee Controller
Fuel: 215HP P7100, Infinite Performance 6x11 VCO, Scheid Conversion Lines, PDD 055s, AirDog II 165, Dual Feed, #0 plate, 4K GSK
Suspension: Thuren 3" Coils, Thuren Sway Bar, DOR Track Bar, DOR Shackle Flip, DOR Extreme Bent Long Arms, Synergy Steering, Fox 2.0 IFPs, Yukon Hub Conversion, Dynatrac BJs, 37x12.5x17 Toyo M/T's on H2s
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post #12 of 42 (permalink) Old 06-27-2019, 11:00 PM
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I did an Eaton FSO 8406A that is good to 900ft lbs. Big difference in size compared to my old nv4500. Plus, I get to use cheaper clutches that are just as strong as southbends. I also get to use an air assist clutch that makes it really easy to actuate the heavy clutch. Plus now I have a 1-3/4 input shaft rather than the 1-3/8 that are on the NV trannys.
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