TF999-Looking for the definitve answer

DarthGremlin · February 25, 2012, 08:57:56 PM

Need a replacement trans for my '84 wagon. I've found a TF999 out of an '87 Wrangler. In the "Auto Trans" post here, it states that 999 will work with some modification, but nowhere can I find exactly what that modification is. In other posts, it seems like people are saying that the 999 goes right in with no mods.

What is the final answer here? Looks like a great deal on this 999, but I don't want to pull the trigger if there is a lot of modding involved.

Any help is appreciated!

IowaEagle · February 26, 2012, 10:11:13 AM

A direct fit.

carnuck · February 26, 2012, 01:31:45 PM

Up until '90 the 999 is a direct fit. After '90 the valvebody went to electronic control.

eaglefreek · February 26, 2012, 06:34:20 PM

Just make sure you use the appropriate torque converter. I'm pretty sure the 87 YJ would be a non lock up converter and I can't remember what the years for a lock up converter were for Eagles.

DarthGremlin · February 26, 2012, 08:29:17 PM

Great information guys. This is just what I needed to know....thank you for all the help.

eaglefreek · February 26, 2012, 08:35:14 PM

Quote from: Regalwizard on February 26, 2012, 07:41:27 PM
Quote from: eaglefreek on February 26, 2012, 06:34:20 PM
Just make sure you use the appropriate torque converter. I'm pretty sure the 87 YJ would be a non lock up converter and I can't remember what the years for a lock up converter were for Eagles.

Converter is trans-specific, not body specific. If the 999 he's got is lockup, he needs a lockup for that trans, if it's non, he needs a non. Drivetrain has little to nothing to do with the body that's over top of it.

I just wanted to make sure he didn't try to use the wrong torque converter in a non lock up transmission.

DarthGremlin · February 26, 2012, 09:32:37 PM

Looks like an '87 999 is non-lock up....correct? Of course, because I have a BRAND NEW lock up converter for the bad '84 unit currently in my Eagle. Look for somebody to get a great deal on that soon!

carnuck · February 26, 2012, 11:05:02 PM

If there is a deep hole in the center of the input shaft (6" or more) then it's a lockup.

standup650 · March 01, 2012, 08:59:56 AM

Does anyone know if this info is right? as far as the years for the tf999
http://street2mud.com/forum/index.php?showtopic=381
thanks

carnuck · March 02, 2012, 12:31:59 AM

Pretty close, but the 6 cyls can be 727 or 999. V8s were all 727 (from the factory. Some people put the lockup 9xx trans in to save fuel on freeway cruisers.

standup650 · March 02, 2012, 05:43:08 PM

do you think its realy worth it, and do you think its any stronger then a well a rebuilt 998?

eaglefreek · March 02, 2012, 08:32:43 PM

998 and 999 are practically identical except for one clutch plate and a wider drum I believe. A 998 can be rebuilt to 999 specs.

carnuck · March 03, 2012, 02:05:00 AM

727 is definitely stronger and since I already owned it, cost wasn't a factor (just wish I'd kept the NP229 tcase that was on it)

standup650 · March 03, 2012, 09:45:44 AM

so just rebuild my 998 to 999 specs will be fine. and if i want more strength then a 727. seems like unless you get a great deal on a new or real low miles 999 its not worth it. thanks guys!

carnuck · March 03, 2012, 10:33:23 AM

Exactly. The planetaries are slightly better too IIRC. Steel case instead of aluminum.

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TF999-Looking for the definitve answer