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Old 03-04-2003, 12:09 PM   #1 (permalink)
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Stupid gay newbie tranny question :)

Will an 88 YJ auto be the same auto as an 89 XJ?
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Old 03-04-2003, 12:18 PM   #2 (permalink)
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should be.
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Old 03-04-2003, 12:20 PM   #3 (permalink)
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The Torque Flite 999 is a medium duty Chrysler 3 speed automatic transmissions. They have an aluminum case and a 23 spline output shaft. The case is ??" long and ?? bolts hold in the pan.

Modern versions are still use the 23 spline output, but engine bolt patterns have changed and the newer ones have electronic shift control. I have conflicting information about torque converters. Some say early models did not have a lock up torque converter and some say they did. Newer models have a lock up torque converter.

Usage
The TF 999 was used in CJs from 1980-1986 only with the I6 and V8 engine. It was also used in 1984-1990 SJs and J pickups with the 4.2L engine, in the YJ from 1987-1991 with the 2.5L and 4.2L engine, and in the XJ in 1991 with the 2.5L engine. A modern version of the 999 continues to be used in Wrangler YJs and TJs to this day with the I6 engine.

Transmission 1st 2nd 3rd 4th 5th Rev
TF 999 2.74 1.55 1.00 2.20
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Old 03-04-2003, 12:22 PM   #4 (permalink)
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Doesn't look like it.


The AW4 is a 4 speed automatic overdrive transmission.

Usage
The AW4 four speed automatic transmission was used in 1987 to 1990 Jeep Cherokee (XJ), & Jeep Comanche with 2.5L & 4.0L engines. The AW4 was also used in 1991 through 1992 Jeep Comanche & 1991 through 1998 Jeep Cherokee & 1993 through 1993.5 Jeep Grand Cherokee with 4.0L engines.
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Old 03-04-2003, 12:24 PM   #5 (permalink)
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I figured the overdrive might be an issue. Can the 999 go in as a replacement without issue?
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Old 03-04-2003, 12:48 PM   #6 (permalink)
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What about this. Lets say I have an 88 YJ 999/231 setup bolted together. I just need to know if I can pull the XJ setup from bellhousing back and toss in the YJ stuff without any mods (cept driveshaft). I know the computers in XJ 4.0 are different, would the system revolt the 999?
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Old 03-04-2003, 01:00 PM   #7 (permalink)
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TF999 in a YJ is also column shift...gonna have to figure that out too.
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Old 03-04-2003, 04:28 PM   #8 (permalink)
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Quote:
Originally posted by Jason R
TF999 in a YJ is also column shift...gonna have to figure that out too.
Lokar and B&M make floor shift kits for the TF999...
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Old 03-04-2003, 06:20 PM   #9 (permalink)
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Quote:
Originally posted by Monkeyboy
The Torque Flite 999 is a medium duty Chrysler 3 speed automatic transmissions. They have an aluminum case and a 23 spline output shaft. The case is ??" long and ?? bolts hold in the pan.

Modern versions are still use the 23 spline output, but engine bolt patterns have changed and the newer ones have electronic shift control. I have conflicting information about torque converters. Some say early models did not have a lock up torque converter and some say they did. Newer models have a lock up torque converter.

Usage
The TF 999 was used in CJs from 1980-1986 only with the I6 and V8 engine. It was also used in 1984-1990 SJs and J pickups with the 4.2L engine, in the YJ from 1987-1991 with the 2.5L and 4.2L engine, and in the XJ in 1991 with the 2.5L engine. A modern version of the 999 continues to be used in Wrangler YJs and TJs to this day with the I6 engine.

Transmission 1st 2nd 3rd 4th 5th Rev
TF 999 2.74 1.55 1.00 2.20
Just to add in to the confusion.
The 999 was also used behind the 84-86 XJ-chevy powered 2.8L v6s and also has the lock up torque converter. They also have the unique 60 deg v6 bell housing. (my converter locks up at 40 mph, and kicks back out at 35 mph)

Just useless info to dabble in, but shares many of the internal parts.
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Old 03-04-2003, 06:54 PM   #10 (permalink)
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I should work out for you. I am using a 91 XJ engine (was mated to an auto), harness and computer in my '88 YJ w/ a 5 spd. The engine computer does not care that all of the auto wires are disco'ed. You will probably need to just ground out the Neutral/Park switch on your XJ harness. I have an FSM from a '91 if you need pin numbers and wire colors. They will probably be different though becuase your XJ has the Renix FI in it.
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Old 03-05-2003, 10:25 AM   #11 (permalink)
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Sounds to me like it would just be easier to find a replacement AW4
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Old 03-06-2003, 09:21 PM   #12 (permalink)
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another dunb newbie

On this same note I have a 1985 jeep waggy with a 999 torque flight in it will that set-up bolt in a 90 yj with 2.5L? also its an amc 360 in the wag with what I think is a 241 t-case.

any help for this newbie?
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Old 03-06-2003, 09:54 PM   #13 (permalink)
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Blah blah blah

Hey strong how is it your threads always produce a load of usless BS



It should not be to hard to find a replacment aw-4 they go for 2-300$ up here in WA.
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Old 03-07-2003, 07:44 AM   #14 (permalink)
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Quote:
Originally posted by GPN Family
Blah blah blah

Hey strong how is it your threads always produce a load of usless BS



It should not be to hard to find a replacment aw-4 they go for 2-300$ up here in WA.
Because I like to annoy old time a-holes like you

I know worst case I can get one for $400. But the more I look into this it kinda sounds like a bad torque converter
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Old 03-07-2003, 02:33 PM   #15 (permalink)
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did you check the fluid level in it?
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Old 03-07-2003, 03:27 PM   #16 (permalink)
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Old 03-09-2003, 06:59 PM   #17 (permalink)
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Dunno if you are having the same AW4 issues I am (in my 89 4.0l XJ)...but my torque convertor quit locking up after I swapped out the master cyl and power booster. I must have narfed the switch (that unlocks the TC when brakes are applied) somehow during the swap.

Friday at lunch I made the rounds - Advance & the Zone don't list it, the Jeep Stealership wanted $40 and a week to order it...I may check NAPA tomorrow, I have heard it's about $12 there.

Anyway here is a link for some cheap mods that allow full manual control over the tranny by 'outsmarting' the Tranny computer (TCU) I plan to try this one day this week at work (it's nice to have a 'wheelin' boss) and if it bypasses the lockup switch, my life will be nearly complete & I won't have to pull the seat out and climb under there no mo!

http://www.bigoffroad.com/pages/bigp...ch/2ndgear.htm
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Old 03-10-2003, 10:21 AM   #18 (permalink)
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Quote:
Originally posted by Jason R
TF999 in a YJ is also column shift...gonna have to figure that out too.
Thats real tough, buy a floor shifter, and hook it up.. Thats what I did when I swapped in my auto into my yj .
Scott
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Old 03-10-2003, 02:05 PM   #19 (permalink)
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I bought a samurai instead I didnt wanna get into another "project" vehicle as a daily for my wife.....so she got this

http://www.rps4wd.com/cgi-bin/yabb/Y...num=1047265339
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