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General Forums => The Mess Hall => Topic started by: kenny kustom on January 27, 2008, 01:47:15 PM

Title: 2.5L to TF999
Post by: kenny kustom on January 27, 2008, 01:47:15 PM
Whats needed with regards to input and output shafts ? Anyone done this swap ?
Title: Re: 2.5L to TF999
Post by: oldjeep on January 27, 2008, 03:22:16 PM
Whats needed with regards to input and output shafts ? Anyone done this swap ?

Input and output shafts of what?   I swapped a 999 into a 2.5L comanche a few years ago, all you had to do was remove the pilot bearing from the crank, swap the flywheel for a flexplate and adjust the driveshaft lengths.
Title: Re: 2.5L to TF999
Post by: Bounty Hunter on January 27, 2008, 06:32:27 PM
Are you switching from the 5spd to the 999?  If the 999 is compatible with the 2.5L, you have to change the transfer case input from short 21spl to long 23spline.
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 27, 2008, 06:58:10 PM
what about the input to the tranny from the engine ? same as the ax5 ?
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 27, 2008, 06:59:53 PM
i am removing the ax5 and putting in the 999
Title: Re: 2.5L to TF999
Post by: oldjeep on January 27, 2008, 08:24:55 PM
what about the input to the tranny from the engine ? same as the ax5 ?

Input from tranny to engine?
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 27, 2008, 08:25:32 PM
tranny to engine shaft.
Title: Re: 2.5L to TF999
Post by: Bounty Hunter on January 28, 2008, 02:44:50 AM
I'm not familiar with the 999 tranny, but if it was commonly available behind the 2.5L you'll likely just have to put in the appropriate pilot bushing.
Title: Re: 2.5L to TF999
Post by: Jesse-James on January 28, 2008, 10:40:07 AM
The TF999 was the auto found behind the 4.0L
Title: Re: 2.5L to TF999
Post by: Bounty Hunter on January 28, 2008, 11:36:28 AM
Good luck with that.
Title: Re: 2.5L to TF999
Post by: RoKnAzn on January 28, 2008, 11:39:35 AM
The TF999 was the auto found behind the 4.0L

I thought it was the TF904 (3Speed)?
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 28, 2008, 11:48:07 AM
This came out of a 87 with the 4.2l
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 12:27:25 PM
TF999 was also used behind the 2.5L in some cherokees and comanches
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 12:29:32 PM
TF999 was also used behind the 2.5L in some cherokees and comanches

YJ from 1987-1991 with the 2.5L and 4.2L engine, and in the XJ in 1991 with the 2.5L engine.

If was originally behind a 4.2L then it isn't going to fit on a 2.5L.   You need one that was behind a 2.5L
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 28, 2008, 12:31:33 PM
It should bolt up, just need to change the input shaft. Did they not all use the same bolt pattern ?
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 12:57:30 PM
It should bolt up, just need to change the input shaft. Did they not all use the same bolt pattern ?

Are you talking about the transmission or the transfercase now?

What did the TF999 come out of?  If it came out of a 4.2L YJ then it has the wrong bellhousing to bolt to a 2.%L
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 28, 2008, 01:04:46 PM
Tranny. Did the 6 and the 4 not share the same bellhousing ?
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 01:08:19 PM
Tranny. Did the 6 and the 4 not share the same bellhousing ?

Nope, never have.
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 28, 2008, 01:19:19 PM
So did you use a dakota housing or what ?
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 01:28:00 PM
So did you use a dakota housing or what ?

I'm getting pretty confused, but here's a shot.

I had a 2.5L Comanche.
I used a TF999 from a 2.5L Cherokee

A TF999 does not have a removable bellhousing, the trans has to match the engine.

On my YJ I have a 2.5L
I used an AW4 from a 2.5L Cherokee
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 28, 2008, 01:36:40 PM
I see. I was under the impression you used an aw4 from a 4.0L . Hmmm. I might have to make an adapter plate for it if i want to use this transmission.
Title: Re: 2.5L to TF999
Post by: Jesse-James on January 28, 2008, 01:43:36 PM
I thought it was the TF904 (3Speed)?

Sorry, I was confused for a sec. The 909 and the 904 were the same minus the converter.
Title: Re: 2.5L to TF999
Post by: oldjeep on January 28, 2008, 04:05:26 PM
I see. I was under the impression you used an aw4 from a 4.0L . Hmmm. I might have to make an adapter plate for it if i want to use this transmission.

AW4 has a removable bellhousing, so you can use any AW4 as long as you have the correct bellhousing for your application.

999's are a dime a dozen, not worth the effort to try to adapt a 4.2/4.0 999 to work with a 2.5
Title: Re: 2.5L to TF999
Post by: Jeffy on January 28, 2008, 04:08:31 PM
It should bolt up, just need to change the input shaft. Did they not all use the same bolt pattern ?

The AMC I6's use a different pattern then the 2.5L's for the bellhousing.
Title: Re: 2.5L to TF999
Post by: kenny kustom on January 29, 2008, 10:50:49 AM
Fine.. I see i have been beat. If i cant mate the tranny to the motor, i might as well just swap out the motor. I have sold my blower, so i think its time for a 360. THEN, i can use the 999......