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Unread 11-03-2011, 11:25 PM   #1
TA-YJ
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1992 YJ Wrangler 
 
Join Date: Dec 2007
Location: Pennsylvania
Posts: 533
TF904/999 Differences and Swap Info

My buddy has a 4cyl auto with the 904 in it. Unfortunately the trans wasnt good anymore and he has to get a new one. He found a 999 for a good price, but for some reason the 904s are 3x the price around here. He was saying because of info that he had heard he would have to switch the axles, get an adapter plate, and use a different transfer case etc. From doing some research it doesnt seem like there would be anything near that much needed. So far all I have found the bellhousing needs swapped and driveshafts need swapped due to length. I thought Id ask the experts on here what all is needed to do the swap. Thanks for the info

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1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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Unread 11-04-2011, 01:07 AM   #2
94chb
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1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell, TN
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i have a 999 and the bell housing is all one piece with trans. so not sure where you got your info from. also the reason the 904 costs more is cause they are alot more rare and hard to find. tell your buddy to just take his trans and have it rebuilt and reinstall it.
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Unread 11-04-2011, 09:00 PM   #3
TA-YJ
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1992 YJ Wrangler 
 
Join Date: Dec 2007
Location: Pennsylvania
Posts: 533
Haha just shows some of the misinformation thats rolling around the internet. I realize why the 904 is so much more expensive. Still, what all would be required to swap the two?
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1992 YJ 2.5L
Engine Mods:4.0L TB, Ford Design III 19lb Injectors, Firepower Ignition System, Ford TBird Electric Fan, Pacesetter Header, Magnaflow Cat, Dynomax Super Turbo Exhaust
Suspension Mods:BDS 2" Lift, M.O.R.E. 5/8" HD Shackles, 1" Brown Dog MML
Other:LED Tails and Herculined
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Unread 11-04-2011, 09:02 PM   #4
94chb
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1989 YJ Wrangler 
 
Join Date: Dec 2009
Location: Whitwell, TN
Posts: 1,956
an adapter plate (if they even make one, which i highly doubt) 999 trans with torque converter, matching transfer case and may have to shorten/lengthen driveshafts
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