TH350 or Th400 ??? in my CJ-7 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-19-1999, 03:57 PM
sheesley
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TH350 or Th400 ??? in my CJ-7

I have a used th350 and th400 both in great shape sitting in my garage. I am currently in the middle of a fiberglass body swap and frame up restoration. I just yanked my old th350 out that was attached to a a NP203 transfer case. Both good transmissions that I have are set up for this full time transfer case, but my friend has a np205...gear driven part time for the th350. What transmission do you guys think I should go with...Off road use is about 40-50%. I currently have 35's, spring over, 350 engine and full size uncut gm drivetrain. thansk for your input.
~TIM~

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post #2 of (permalink) Old 12-19-1999, 04:59 PM
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Re: TH350 or Th400 ??? in my CJ-7

I have a Turbo 350 with Heavy Duty clutch packs and I have had no problems with it. I know the T400 is a beefier unit but I have had my T350 in some pretty crazy stuff and haven't had any problems. I would go with the T350/NP205 combo.

Just my opinion

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post #3 of (permalink) Old 12-19-1999, 05:03 PM
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Re: TH350 or Th400 ??? in my CJ-7

Just food for thought, a 350 is about 3 inches shorter and has a very slightly lower 1st gear, if either of those are considerations.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
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post #4 of (permalink) Old 12-19-1999, 05:09 PM
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Re: TH350 or Th400 ??? in my CJ-7

unless you are abusing it(rough wheelin) or are producing major power stick with the 350.
the 400 is a beefier trany but also uses a lot of HP.



CJJ
post #5 of (permalink) Old 12-19-1999, 06:00 PM
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Re: TH350 or Th400 ??? in my CJ-7

IF your friend has a 205 setup for a TH-350 then that is the one that I would go with. It is smaller than the 203 and is gear driven instead of chain.
Go for the TH-350 & 205.

post #6 of (permalink) Old 12-19-1999, 10:34 PM
 
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Re: TH350 or Th400 ??? in my CJ-7

This is just my opinion, but...
The TH-350 will probably live doing almost anything you can put a jeep through.
The TH-400 really isn't necessary unless you are making more than 400 to 450 honest to god horse power, and able to apply it to the ground.
(Applying 400 HP to the ground is no small feat! Ask any drag racer.)

You may consider the TH-700R-4 also. It is much stronger than the TH-350, and almost as strong as the TH-400, but lighter, gives you an extra gear to keep you in the power band, can be used with or without lockup converter, doesn't waste power like the TH-400, and is something that not every off-roader has.
I saw the adaptors and tail shaft kits for under $200 in two different off road catalogs recently.
Good luck and happy trails.


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post #7 of (permalink) Old 12-20-1999, 02:22 AM
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Re: TH350 or Th400 ??? in my CJ-7

The TH-400 is definately the HD choice, however; GM always mated TH-350's to small blocks and reserved the big blocks for TH-400's. Jeep happened to choose the TH-400 for various models and years for the extra beef. The 205 xfer is like the TH-400, bullet proof. It's drawback is the puny low range of 1.96:1. The 203 is no better at 2.01:1. With the choices you've listed, I'd go with the 400/205 combo if you can afford the adaptor to mate the two. If not then the 350/205 would be the next choice. Don't go with a small convertor, or the additional heat in the fluid will shorten the life expectancy of the tranny. By the way, the TH-700R4 is comparible to a 4 speed TH-350, not as heavy duty as a TH-400. Where the 700R4 really shines, besides the 30% overdrive, is the lower 1st & 2nd gears compared to both the 350 & 400 trannies.

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post #8 of (permalink) Old 12-20-1999, 08:23 AM
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Re: TH350 or Th400 ??? in my CJ-7

<font color=purple> Gonna let everyone in on a little secret here, the TH350 is the toughest choice for a 4x4. The TH700 is not nearly as heavy-duty & the TH400 has ONE major weakness - full-throttle downshifts into 1st gear. Not something that ever happens in a dragster or a towing vehicle, but pretty common for anyone who's ever been stuck in the mud. You've got one & it's an easier fit anyway, so go with the TH350. </font color=purple>

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post #9 of (permalink) Old 12-20-1999, 12:03 PM
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Re: TH350 or Th400 ??? in my CJ-7

I don't honestly think there's a tranny shop around that say a TH-350 is tougher than a TH-400. That's why you don't find TH-350's behind big block motors. A TH-350 behind a small block motor that's not punched to the limit is a good choice. A TH-400 is better for beef and longevity.

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post #10 of (permalink) Old 12-20-1999, 12:13 PM
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Re: TH350 or Th400 ??? in my CJ-7

<font color=purple> Every shop in my area will say exactly what I said. In cases where you'd have to do a full-power downshift into 1st, don't use a TH400 UNLESS you convert it to TH475. Granted, that's limited application, but it certainly applies in the 4x4 world. I have two friends running similar 700-plus HP big-blocks in competition mud bogging. The TH400 goes back for repairs at least once a season - the TH350 has been in there since '95 untouched. We only have two guys I can think of off the top of my head who run deep mud with a TH400, but lots of guys who USED to run one. Granted, what I say may not have anything to do with what the guy who threw up the original post has planned. But, I did qualify my response by saying where the TH400's Achille's heel is. I ran a TH400 in my hot street truck, but a TH350 in my mud racer. </font color=purple>

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