Which tranny to run -TH400 or TF727? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-19-2003, 03:55 PM Thread Starter
 
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Which tranny to run -TH400 or TF727?

I purchased a 401 that will find a home in my CJ soon and have turned my thoughts to a tranny. I could and may keep my current T-18 behind it, but have always been somewhat curious about those wheelers who do not do the three pedal dance while trying to re-start a stalled engine on an obstacle.

Both the trannies I am asking about came behind a 360 so I think either would work with my 401. What about adapting to my Dana 300? Bolt up or no? I am running it fully clocked (flat skid), any problems with driveshaft clearance in that configuration with either tranny?

Thanks
Max
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post #2 of (permalink) Old 04-19-2003, 10:00 PM
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Re: Which tranny to run -TH400 or TF727?

Don't think you can get much better than a Turbo 400 and you don't have to mess with a Kick Down...But I think you will have to make a few changes with any auto (keeping the 300). If you want to part with the T18, let me know.

Andy
post #3 of (permalink) Old 04-19-2003, 10:10 PM
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Re: Which tranny to run -TH400 or TF727?

</font><blockquote><font class="small">In reply to:</font><hr />
Don't think you can get much better than a Turbo 400 and you don't have to mess with a Kick Down...

[/ QUOTE ]

Partly true. The TF727 kickdown in mechanical from the throttle shaft on the carb/throttle body. The TH400 uses an electrical kickdown switch activated by the throttle pedal just above your right foot.
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post #4 of (permalink) Old 04-19-2003, 11:09 PM
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Re: Which tranny to run -TH400 or TF727?

If you can get a 727 out of a G-Waggie they came bolted to 360's and Dana 300 t-cases, so it would bolt right up. IMHO, the 727 is a better trans than the T-400 and it doesent have the adapter issues. But I'm a MoPar guy so I am biased. I doubt you would break either trans with a 401. These transmissions came behind the baddest musclecars of the '60's and early 70's and a 401 just doesent put out the power of an LS6 or a HEMI !
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post #5 of (permalink) Old 04-19-2003, 11:17 PM
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Re: Which tranny to run -TH400 or TF727?

The T400 that was bolted to a 360 was also bolted to a quadratrac transfer case, so it will bolt right to the 401, but you will need an adapter to either the D18 or the D300.

The TF can be found in waggies and CJs bolted to both sixes and eights and the D300, so if you find one of those you will not need the adapter to the D300 or the engine as both the 258s and the V8s are the same bolt pattern.

Both are great trannies and will work with the right parts. I would say whichever you can find that is a better deal would be the one to go with. Keep in mind the adapter for the T400 to the D300 are in the $400 range, so keep that in mind when shopping.
post #6 of (permalink) Old 04-20-2003, 01:28 AM
 
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Re: Which tranny to run -TH400 or TF727?

While I think most agree that the TF727 is a great tranny and has some advantages, It also has disadvantages.

Plus's:
1. BEEF! Good luck hurting it!
2. It will run well in off camber and steep stuff.
3. No adapters necessary to bolt to your 401or 300.

Minus's:
1. The huge tranny pan!
2. Kick down cable
3. If you want to clock your 300 flat , you should have a clocking ring. (stronger than drilling new holes)


The minus of the huge tranny pan was a big one for me. I ended up having to go with a two piece front driveshaft. If you don't clock the tansfer case flat you can get by without one as long as you have enough lift. Mine is clocked flat.

I am only running a 258 right now but plan on going to a V8 as soon as the bugs are worked out. I only have room for exhaust down the drivers side. This means you will have to run a single exhaust with the crossover infront of the tranny. This could create a clearance issue.
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post #7 of (permalink) Old 04-20-2003, 09:54 AM Thread Starter
 
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Re: Which tranny to run -TH400 or TF727?

The biggest issue for me it seems like is the driveshaft one. I am using a clocking ring and currently have the Dana 300 clocked flat; I like it a lot that way and would not go back. I have a lot of lift SOA w/ customized waggy packs, 1 in. BL and I have raised the drivetrain itself another inch or so. I don't think availability is an issue; both trannies are plentiful in waggies at the local pull n save. I didn't think the Dana 300 came behind either tranny? That case was only used in CJ's, right? And they only came with the 904 or 999. Maybe the J trucks used Dana 300 + 727? Looks like the issues boil down to:

727: kickdown linkage harder, driveshaft clearance issues with clocked Tcase

400: adapt to Dana 300

Thanks for all info and opinions.

Max
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post #8 of (permalink) Old 04-20-2003, 08:42 PM
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Re: Which tranny to run -TH400 or TF727?

Let me make sure that I don’t mislead you…..You can use either a Factory type linkage for the kick down on the 727 or you can purchase a cable type but the cable ones that I know of run well over a hundred bucks. I used a cable one on my 440 Ramcharger because of Intake height and it was easier to set-up than the linkage.

Andy
post #9 of (permalink) Old 04-21-2003, 02:58 AM
 
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Re: Which tranny to run -TH400 or TF727?

The kick down from Lokar is not that much, only about half.

Lokar Kick Down
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post #10 of (permalink) Old 04-21-2003, 10:31 AM
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Re: Which tranny to run -TH400 or TF727?

Th400's also came with stock d-20 transfer cases no adapter needed.
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