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post #1 of (permalink) Old 10-21-2007, 08:16 PM Thread Starter
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tranny swap?

Hi

I have an '82 ish CJ7 with the 4 speed manual tranny.

I've got what I think (correct me if I'm wrong) is a TH400 automatic tranny out of a 73 Jeepster with about 65K on the clock...

Would that be a worthwhile swap er not really? I'm planning on a 4.6 stroker build/swap this winter and was just wondering if maybe swaping that tranny over might be an idea to run with or not...If so...would I want to stay with the Dana20 it's mated to for a x-case or use the 300 that's in my CJ already?

Thanks!
Patrick

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post #2 of (permalink) Old 10-21-2007, 11:19 PM
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Having had both the manual and auto, I prefer the auto overall.....

Tough call....the TH400 is a great auto....but the D300 is a better xfer case vs the D20....keeping in mind that the D20 is no slouch.....

tough call.....

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post #3 of (permalink) Old 10-21-2007, 11:39 PM
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Id put the TH400 in and use the D20 x-case.

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post #4 of (permalink) Old 10-22-2007, 04:57 AM Thread Starter
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Would the 300 mate to the TH400?

Anybody tell me for sure if I have the TH400?
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post #5 of (permalink) Old 10-22-2007, 05:04 AM
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Yep, that's a TH400 and yes, you can adapt the D300 to it. That is what I'd do, the D300 is a much more robustT/C. Novak sells an adaptor kit for the swap for about 475.00

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post #6 of (permalink) Old 10-22-2007, 06:04 AM
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I wouldn't have an auto box under any circumstances - they're too tricky to drive. But I'm just an

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post #7 of (permalink) Old 10-22-2007, 12:19 PM Thread Starter
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$475 for an adaptor...ouch!

I was just contemplating it as I lack coordination (though I think it will come with more practice)...had it in the garage...was doing a big engine swap...and I think the tranny I have is considered to be somewhat weak (or is that wrong)...

Thanks!
Patrick

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post #8 of (permalink) Old 10-22-2007, 02:11 PM
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The TH400 is about the strongest Tranny you will find that will fit in a Jeep. The D20 is the forerunner to the D300...You will break the adapter between the tranny and tcase long before you ever break the D20. TH400 is geared lower than a TF727 or TF999. Picture makes it look as though you do NOT have the motor to tranny adapter ring...You will need it.

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post #9 of (permalink) Old 10-22-2007, 06:42 PM Thread Starter
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I believe I have the adaptor ring in another pile...

Can someone tell me for sure from that picture if it is mated to a Dana 20?

So, a few weeks ago I listed this (tranny and xcase) on craigslist for $300. Someone said he'd take it for $200...I agreed...but he said he couldn't pick it up for a couple weeks and if I could find someone else to buy it for more I should take it...

Would a change of heart and me keeping it and swapping it into my Jeep be an OK reason for me to break this "contract?"

What else would be involved with this swap if I decide to pull the trigger? Would it be a pretty easy (relatively speaking) swap onto a 4.0 motor?

What would be some of the details I would need to know about? On the Commando the shifter was on the column...would it be easy enough to make it a floor mounted shifter?

Thanks!
Patrick

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post #10 of (permalink) Old 10-23-2007, 06:26 AM
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Sell it for the two bills and get a nice manual box.

Or sell it to your wife for $250. Since the buyer gave permission to sell it for more, I'd say that you have a very iffy contract, and shouldn't feel like too much of a heel if you broke it.

It sure looks like a D20 from that picture. Clean it up and take a better picture from the back.

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