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Unread 02-18-2013, 09:04 PM   #1
tjeep1
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1978 CJ7 
 
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amc turbo 400 automatic tranny

im wanting to pick some brains of the great people on here that have helped me out on my build. my 258 is all done sitting at the machine shop. im being told you can put a dana 20 behind the 400 and it will work. does anyone know if it is a bolt on app. or is this person mistaking, i do not want to have to buy adaptors and what not. any help is on this subject is appreciated.

THANKS IN ADVANCE

ps. im coverting to a automatic and dont want quadratrac

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Unread 02-18-2013, 09:10 PM   #2
lucdog
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The Dana 20 is not a direct bolt on to the TH 400. If the TH 4oo you have is from a Jeep, the Qudratrac is the only transfer case that will bolt up.
There are other options, like the 999 used in CJ's from 1980 on. Bill
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
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Unread 02-18-2013, 09:37 PM   #3
tjeep1
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thanks bill so will the tf999 mate with the dana 20 transfer case or will i need to use adaptors. 20 in the rear and 30 in front,i know the shafts will need changed anything else be needed for the swap. thanks in advance
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Unread 02-18-2013, 09:53 PM   #4
lucdog
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I don't have a ton of Knowledge regarding automatics in CJ's , I do know the Dana 300 was used behind the 999. Don't know if the 999 can be adapted to the Dana 20.
I'd say a call to Novak or Advance Adapters would be good.
There is also the option of the 727.it wasn't used in CJ's , but it was in Jeep trucks, and I think Grand Wagoneer's. the problem with the 727 is front driveshaft clearance issues with less than a 4" lift. Don't know if the Dana 20 can be bolted to it either, I read mostly there run with a Dana 300
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 02-18-2013, 10:10 PM   #5
tjeep1
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thanks bill for your help
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Unread 02-18-2013, 10:12 PM   #6
lucdog
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The TH 400 was also used in a lot of GM trucks, with the Chevy bolt pattern. ( the Jeep pattern is different.) it can be used with a adapter on a jeep engine, as can any GM tranny.

If I were to build a Jeep, and wanted a automatic I'd go with the 999/Dana 300 combo, for ease of install, and cost. And depending on intended use maybe a Th700r4 GM, with the Dana 300. Lot of choices out there. So do some research on the transmissions listed , figure the cost of each, and go from there.

Other things you will need are,
1.) tranny cooler, either a stand alone one, or built into the radiator.
2,) shifter and linkage. Column or aftermarket on the floor.
3.) cooling lines from the tranny to the cooler.
4.) kick down linkage from the carburetor to the tranny.
5.) the proper flexplate and torque converter for the engine and tranny
( standard trannys use a flywheel, autos use a flexplate)

I don't have a clue what any of the correct parts are to use for a GM tranny on a Jeep Engine.

Bill
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 02-19-2013, 08:06 AM   #7
gazzo
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999 and 300 are stock on our Overlanders. Fwiw I just swapped out my 999 for manual and it is WAY better in my opinion. That auto ( and I have/had two with this config, one freshly rebuilt) absorbs quite a bit of power. The manual is a dream to drive by comparison. Just my two cents. What bill says is right, it will be easy but possibly not best. Just sayin. With a good 258 you don't really need to change gears all the time either, don't really get sick of it.
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Unread 02-19-2013, 08:33 AM   #8
CSP
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The TH400 can be used with the Dana 20, but it needs the correct output shaft and tailhousing, which is doesn't have with a Quadratrac behind it. Jeep pickups and Commandos were available with the Th400/Dana 20 combo.

The Dana 20 can be used behind the 999, but it's a bolt on only with the right adapters. Only the Dana 300 is a direct bolt on.
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