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!
A direct fit.
Up until '90 the 999 is a direct fit. After '90 the valvebody went to electronic control.
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.
Great information guys. This is just what I needed to know....thank you for all the help.
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. ;)
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!
If there is a deep hole in the center of the input shaft (6" or more) then it's a lockup.
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
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.
do you think its realy worth it, and do you think its any stronger then a well a rebuilt 998?
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.
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)
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!
Exactly. The planetaries are slightly better too IIRC. Steel case instead of aluminum.
Quote from: carnuck on March 03, 2012, 10:33:23 AM
Exactly. The planetaries are slightly better too IIRC. Steel case instead of aluminum.
planetaries were the same when i compared them. was that the way it was supposed to be¿
It may have been only the V8 (304) AMC cars that got the steel cased planetary gears then. The aluminum ones were quieter, which was why they didn't stay steel for all models.
I thought that one style cage was for narrow gears and the other for wide gears?
That would be 904 vs the others. (909, 998, 998)
So not to sound dumb, just checking, steel would be better for strength and longevity right?
It is my understanding that the 999 has a lower 1st gear than the 998. 999's were in Jeeps, 998's were in Eagles. Don't quote me on this as I am no expert, that is just what I have heard from some trans guys in my 4X4 club.
9XX has wide ratios. 2.74 first. 1.54 second
727 has closer ratio. 2.45 first. 1.45 second
There is performance kit$ to get 2.74 or lower first/second gears from a race $hop in CA, but $1,000 a set was a bit steep to me. (I actually think they may be just stock 47RH planetaries)
So, it looks like I will be picking up my 999 tomorrow. It is still attached to a running 258 that happens to have a Weber carb....got the whole set for a deal that was too good to say no to. All this came from an '87 Wrangler project that was apparently too rusty to go forward with. Hope to move forward fairly quickly and get the Eagle back in fighting form.
Good luck! hope it goes smoothly for you!