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Nitro Gear Packages Now Available at Rockridge 4wdG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChSPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!

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Unread 08-03-2006, 09:25 AM   #1
ckritcoad
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Tf999

What are your opinions on the TF999 3 speed auto? How well would it work with a 350 and 35's?
Thanks,

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Unread 08-03-2006, 09:43 AM   #2
BLS33
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You shoulod probably upgrade, or at least get some kickdown linkage
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Unread 08-03-2006, 09:50 AM   #3
Salt Hay
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I had one for years in an '84 CJ-7 behind a 360. It's a good trans , has a nice low 1st for an auto , but a 350 and 35's are probably too much for it ..........
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Unread 08-03-2006, 10:03 AM   #4
jeepskate
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It'll live if you're not a leadfoot. It's essentially the same basic trans as the 904 only a bit beefier and has served many people well behind V8's in it's Mopar cased version. Make sure the throttle valve (kickdown) linkage is installed and properly adjusted, run a bigger pan for more fluid, and run a cooler.
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'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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Unread 08-03-2006, 10:26 AM   #5
bdmonist
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I have a 360, 999, and 35's and so far have not had any problems. I am currently researching installing a SBC 350. I spoke with Novak Adapters and they recommended against the 999 with a 350. Their recommendation was a 700R4 or TH350. I did some research on my own and I also now believe those are superior transmissions by far. The 700R4 has an overdrive which will help on fuel as well. If you already have the setup you are asking about, I would let it go until it breaks - that's what i am doing. If you are looking for a setup to install, I would not install the 999 with a 350.
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1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.

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Unread 08-03-2006, 11:25 AM   #6
86cj74.2L
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The 999 in my inlaws 86CJ7 258 has 130k on it. When the original motor died at 115k I had the local tranny shop go through it because of the mileage it had. (even though it still had a tight kick shifting into second)

They put new bushings and seals in and slapped it back together. It looked brand new inside.

Its a good tranny! The drag racers prefer it over the 727 because of its lower 2.75:1 first gear ratio and sucks up less horsepower to spin.

Chrysler trannies like to be kept cool. Go to a swap meet and find a tranny cooler out of a Cummings plum it into the cooler lines before the rad, put a remote filter on it from Perma Cool (or Summits own version which is the perma-cool without the temp gague) and put it in the return line going back to the trans and you will have no problems.

If you're running 35 and do not change your axial ratio you will kill a turbo 350 and a 700r4 from the heat the torque converter is making from it slipping with the taller overall gear ratio the 35's change it to.

I've seen a stock V6 kill a 700r4 with mild towing which would be equivalent to the extra work it would take to spin 35s. I've seen plenty of turbo 350 die as well on full bodied Chevy's with a mild 350 under the hood.

Get a Dakota automatic trans/transfer case and bolt the tail section and transfer case to your 999 and have your overdrive unit. Changing your drive shaft lengths (according to a friend of mine who uses one in his 10.20 second Demon) will need to be done.
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Unread 08-03-2006, 12:28 PM   #7
jeepskate
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Quote:
Originally Posted by 86cj74.2L
Get a Dakota automatic trans/transfer case and bolt the tail section and transfer case to your 999 and have your overdrive unit. Changing your drive shaft lengths (according to a friend of mine who uses one in his 10.20 second Demon) will need to be done.
I'd like to hear more about this one. Could you start a new thread about this or PM me about it (I don't want to hijack this thread)? IIRC the Dakota used the NP-231 which is bolt-on compatible with the Dana 300 assuming the Dak uses 23 splines. I was about to cannibalize a spare 999 to put the lower first gear and the tail section & shaft into a Mopar 904...this sounds like an interesting alternative (like I *really* need to be entertaining changing something else in my build).
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'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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Unread 08-03-2006, 01:22 PM   #8
86cj74.2L
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Quote:
Originally Posted by jeepskate
I'd like to hear more about this one. Could you start a new thread about this or PM me about it (I don't want to hijack this thread)? IIRC the Dakota used the NP-231 which is bolt-on compatible with the Dana 300 assuming the Dak uses 23 splines. I was about to cannibalize a spare 999 to put the lower first gear and the tail section & shaft into a Mopar 904...this sounds like an interesting alternative (like I *really* need to be entertaining changing something else in my build).
I must rehook up with my buddy about that. About 2 years ago I mentioned it to him while running into him at a local Napa store. He sounded like (from 2 years ago anyway) that it would be no problem. Expecially if I didn't mind the 231 XFER case. I like the gear drive better myself if given an option between it or a chain drive unit.

I got the idea back then after finding out how much an overdrive unit costs.

When I get more info I start a new thread.
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