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  #1  
Old 04-14-2020, 09:27 AM
brentwood brentwood is offline
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Noisy Dana 20

I bought my truck with a 2wd drive line in it. Working on getting it back to 4wd. I bought a used Dana 20 with Novak adapters kit for divorced setup.
It's really noisy on the road. It makes a loud whiney noise as you get up to speed. All the gears looked to be in good condition before installing. I used napa 80/90w oil in tcase.
Are these Novak kits known for being noisy? What do you guys think could be the issue?
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Last edited by brentwood : 04-14-2020 at 09:53 AM.
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Old 04-14-2020, 09:33 AM
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fulsizjeep fulsizjeep is offline
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Join Date: Aug 21, 2002
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I am a bit confused. Is this for the 82 Waggy in your signature? What did the D20 come out of?
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Old 04-14-2020, 09:52 AM
brentwood brentwood is offline
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No this is for a 72 j4000 that came with a Chevy 350, t350 2wd. Transfer case was used, not sure what it came out of.
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Old 04-14-2020, 10:05 AM
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fulsizjeep fulsizjeep is offline
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Thanks for clarifying. So, maybe it's a Jeep D20 since you have right hand differential on front. Is it a straight line front to back on divorce drive shaft?

I have limited experience with D20. I had a J4000 360/T18/D20 back when it was only 4 years old. The transfer case worked flawlessly the 2 years I had it.

I'd be interested in pictures of this setup from underneath.
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Flint
Ran when parked.
http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s with a few Evil Twin & TT's Fabworks mods
76 401 Wag, 77 401 Wag, 77 401 J20
http://eviltwinfab.com http://www.ttsfabworks.com
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Old 04-14-2020, 05:20 PM
brentwood brentwood is offline
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Location: Mullica River, NJ
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So short shaft to transfer case and rear driveshaft centered. Passenger drop for front driveshaft.
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  #6  
Old 04-15-2020, 08:46 AM
brentwood brentwood is offline
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Fixed noise.

Figured out truck wasn't fully shifted into 2wd.
Whine is now gone.
But now it doesn't want to shift into 4 hi. I have 2wd, neutral, and 4lo. It is really hard to shift transfer case.

What do you think problem could be?
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Old 04-15-2020, 08:48 AM
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tgreese tgreese is offline
 
Join Date: May 29, 2003
Location: Medford MA USA
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I understand that the Dana 20 has been converted to use as a divorced transfer case. Was this a lot less expensive than their kit for the TH350? That would seem the better way to do this.

Stationary or while moving? Engaging 4WD HI can be balky if not moving.

Do you have a front driveshaft? The front driveshaft speed has to match the rear to shift into 4HI. You should be able to do this at any speed, as long as you are going straight ahead. Are the front and rear axles the same ratio? That seems a likely problem for a 2WD conversion.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
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Last edited by tgreese : 04-15-2020 at 09:11 AM.
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  #8  
Old 04-16-2020, 06:47 AM
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tgreese tgreese is offline
 
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What kind of shifter are you using? The Dana 20 uses one shift rod for each axle: high, neutral, low. The interlock pills on the shift rods will prevent one axle high and the other low. They also prevent front-only in either range.

Thus to go into 4WD high, you need to have the front axle (outer) shift rod in neutral and rear axle shift rod in high (forward). You can then move the front axle rod forward to engage the front axle.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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  #9  
Old 04-16-2020, 09:08 AM
brentwood brentwood is offline
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Join Date: Oct 01, 2015
Location: Mullica River, NJ
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Awesome information. Thank you tgreese Good call on not having front driveshaft installed yet.
I went with divorced setup because I found a cheap Dana 20 with Novak kit already installed. It would have been cheaper to swap transmission than to buy either kit.
I'll post some pics once the driveshaft and exhaust are installed.
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  #10  
Old 04-19-2020, 01:18 AM
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FSJunkie FSJunkie is offline
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A Dana 20 should be absolutely silent in 2wd, produce some light whine in 4hi, and whine pretty loudly in 4lo. The shift from 2wd to 4hi can be made at any speed driving forward, but I've personally never done it above 40 MPH. The lever will slide into 4hi like butter if you apply a little throttle as you shift, but do not spin tires. Let off the throttle to shift back to 2wd. Sometimes shifting from 4hi to 2wd requires more force on the lever due to tension built up in the drivetrain in 4hi. This can be a sign that road traction is too high for proper 4wd use.

The D20 will grind terribly if you try to shift from 2wd to 4hi with the front and rear driveshafts spinning at different speeds for any multitude of reasons: different tire sizes, turning sharply, different axle ratios front to rear, front locking hubs unlocked, or spinning tires while trying to shift.
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