Looking for a Jeep 999 auto trans

[Justwheelin]

I am looking for a what I think is known as a Jeep 999 3 speed automatic transmission. I think they were most common in Wanglers 91 and newer with the 4.0 engine. Please send me a PM if you can help me out.

 

[BrettM]

first off, there is a wanted section, second, they never came in XJs so you'd probably be better off looking at the for sale section of Jeepsunlimited or Pirate4x4, third, why not use an AW4? It's a way better tranny all around.

 

[Justwheelin]

I'll take your suggestion on other places to post inquiries.

The AW4 doesn't fit want I want to do becasue, I am running a lot of horses, I don't need an overdrive, the AW4 would require more modification to install and it cost twice as much to rebuild so it is strong enough for the application.

 

[BrettM]

how much power are you talking? the AW4 is likely stronger in stock form than the 999, are you planning on building the 999?

 

[Justwheelin]

I am getting just under 400 hp at the rear wheels, running 60s front and rear with 40" tires. Yes, I am planning to build the 999 and estimated about $600 verses 12 to $1300 for the AW4. Plus I think the AW4 is phisically a little bigger and would be a problem in the space I have, unless I start modifying the floor board. I talked to a buddy who owns a trany shop and owns 2 competition rigs, this is what he recomended.

 

[Cooter]

The 999 is a great tranny with a lot more build options than the AW4, plus there are no wiring harnesses or ECUs needed for it to operate. It is also one of the shortest auto trannies you can run.

If you don't need one set up for a CPS, the CJs from '80 on up have the 999 as well. I have one or two here, but I'm a little too far away from you.

What motor are you running? (There are several bellhousing bolt pattenrs available)

 

[RichP]

Had a 999 in our 89 wrangler. Takes alot of abuse and keeps on running. There is a neutral safety switch in there that is a bit pricey to replace so we just jumpered it out instead. Major problem was that it was so efficient that the brakes would not stop it in 4Lo.....

 

[bajacalal]

I am looking for a what I think is known as a Jeep 999 3 speed automatic transmission. I think they were most common in Wanglers 91 and newer with the 4.0 engine. Please send me a PM if you can help me out.

I'm no a/t expert, but wasn't the 999 basically the same tranny as the 727 which is a non-lockup tranny introduced in the 60's, known for durability and used on Dodge trucks and cars throught the 70's and the 999 starting in the 80s. I don't know what the spline count and other interchange issues are present w/ these different vehicles but it is be possible to get a 999 cheaply from say a half ton pickup. Maybe you could look into this, I don't know the answer, would you be able to pull some measurements to determine compatability and then hit up some junkyards. The first few years of the 727 had a cool feature that allowed you to bump start the vehicle even with an auto tranny.

 

[indyjeepnut]

Go 727 if you are running HP. Bottom line.

 

[Cooter]

999s are running in the 8's, and have a lot less rotating mass than the 727. That's why 999 guts are swapped into the 727 in the stock classes.

The 999 also has a lower first gear stock.