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  #1  
Old 10-18-2013, 08:37 AM
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BillyWagoneer BillyWagoneer is offline
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turbo 400 and dana 20?

would you do it? in my quest for a passenger side drop transfer cases i originally was gonna go 727 and dana 300 but i came across a turbo 400 and twin stick dana 20 with an adapter for 300 bucks. kinda tempted just wanted to know what you guys thought?
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  #2  
Old 10-18-2013, 09:07 AM
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Heavy_Metal_Thunder_81 Heavy_Metal_Thunder_81 is offline
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I did it. Swapped out my QT for a Dana 20. Very stout combo. Low range sort of lacks but I don't use low range a whole lot anyways.
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  #3  
Old 10-18-2013, 09:18 AM
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yeah well im going to be, im trying tobuild a trail capable tow rig/camping vehilcle. the low range sucks on the d20 then there is no point. i think the d20 is 2.04 and the d300 is 2.66
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87 gwag
De Smogged
Promar Amc 360 Ci
.60 Over
Melling MTA-1 Cam
MSD Multi Spark TFI
Holley TA
Performer Intake
Hedmann Full Length
True Dual side pipes
TF 727 & np229
B&M Shift Kit
12 Bolt rear & D44 front
4.10's and ARB lockers
SOA & shackle flip
33 12x5's
Empty wallet
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  #4  
Old 10-18-2013, 09:20 AM
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The low range is the only real down side to the D20. They do make low range gears for them.
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Old 10-18-2013, 09:55 AM
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In case you decide to go for it, I have a new in box Teraflex LOW20 for a 20 mated to a Turbo 400
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  #6  
Old 10-18-2013, 10:10 AM
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how much would that run me
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87 gwag
De Smogged
Promar Amc 360 Ci
.60 Over
Melling MTA-1 Cam
MSD Multi Spark TFI
Holley TA
Performer Intake
Hedmann Full Length
True Dual side pipes
TF 727 & np229
B&M Shift Kit
12 Bolt rear & D44 front
4.10's and ARB lockers
SOA & shackle flip
33 12x5's
Empty wallet
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  #7  
Old 10-18-2013, 10:17 AM
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PMd you
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  #8  
Old 10-18-2013, 10:19 AM
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You can get 2.42:1 from the Dana 20 using Dana 18 parts and a Bronco sliding gear. Much less expensive than the Teraflex gears. Make sure you get the right gear - some of the sources on the net list the wrong part number.

Really, with an automatic you don't need the super low reduction that you'd like with a manual. It's a different style of driving, with one foot on the brake and one on the gas. You need good transmission cooling though.

There's an article on Pirate called "Uber 20" that you might want to read. Not sure that the output kit from Advance Adapters is still available ... you can carry an extra output housing for a lot less. http://www.pirate4x4.com/tech/billavista/Uber-20/
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  #9  
Old 10-18-2013, 11:35 AM
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[quote=tgreese]You can get 2.42:1 from the Dana 20 using Dana 18 parts and a Bronco sliding gear. Much less expensive than the Teraflex gears. Make sure you get the right gear - some of the sources on the net list the wrong part number.


It will fit in the case but wont bolt up to a th400. Only manual. Stock th400 adapter has a goofy 15 spline bull gear. The low20 is cool though prob not cheap.
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  #10  
Old 10-18-2013, 12:35 PM
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Quote:
Originally Posted by tgreese
Really, with an automatic you don't need the super low reduction that you'd like with a manual. It's a different style of driving, with one foot on the brake and one on the gas. You need good transmission cooling though.
I agree. I have a TH400-D20 combo with fairly low 3.31 axle gears. Locked in 1st gear, 700 RPM idle is about 3 MPH. Slow enough for most offroading, but when you get into particularly bad stretched all you do is one foot on the brake and one on the gas. The 360 has plenty of torque to get you through anything even just slightly above idle, and you can go as slow as you want. Don't worry about heating the brakes, it doesn't happen. The transmission will probably heat up from torque convertor slip, but that's what an auxillary cooler is for.

Works great.
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  #11  
Old 10-18-2013, 02:47 PM
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Plenty of NPxxx cases that would work, and have better crawl ratio.
Chevy & Dodge that are passenger drop.

Nothing wrong with the th400/d20, but why swap the tranny unless you have to?

If you go the TH400 route make sure it's the AMC bellhousing and not the nailhead/adapter set-up(used on '74-earlier SJ's).
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Old 10-18-2013, 04:27 PM
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HUH

I really don't think the D20 is the deficient. I would rather have the 727.
I really think you have to look at what you'll be doing. The d20 is stronger gear unit it has a lot more good attributes than bad.Iif you 're going to climb a tree then if you has no power you might want to go lower if you're just going to offroad It's fine.
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  #13  
Old 10-18-2013, 08:08 PM
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Dodge NP208 bolts onto the Jeep 727.
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