3.89 gear swap!! Help! - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 38 (permalink) Old 09-30-2010, 09:16 PM Thread Starter
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3.89 gear swap!! Help!

Ok I'm doing a 3.2 to 3.5 motor swap in my 98 intrepid es and I wanted to go ahead and do the gear swap as well.

My question is can I just swap a whole 2.7 transmission or do I just need to do the gears? If so how many gears do u need out of the 2.7 transmission and which ones?? Any info would be extremely helpful also is the swap worth it? What do I gain from it exactly like 0-60 time difference? Thanks

Also what are some other performance mods I can do while I'm swapping the engine and doin the gear swap? Any shiftkits available for the intrepid? And what does a torque converter do?

Last edited by Corydavis224; 09-30-2010 at 09:19 PM.
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post #2 of 38 (permalink) Old 09-30-2010, 10:52 PM
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The two transfer gears are behind the rear cover in the transmission. You could swap a whole 2.7 trans in and that would give you the gears, or just the gears themselves. Remove the rear transmission cover, and you'll need the two gears and the chain, they come off easily just by removing the snap rings on their shafts. Do not get them mixed up, and make sure the spacer behind the one gets put back on. It gives you some nice low end torque.

Torque converter is a fluid coupling....it transfers power to the transmission, and removes power so that you can stop the car in gear....like a clutch in a manual transmission.


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post #3 of 38 (permalink) Old 09-30-2010, 11:18 PM Thread Starter
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Thanks daytrepper! Would u recommend a whole trans swap or gears only? Also is there after market torque converters or something and do u know anything about shiftkits as well?
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post #4 of 38 (permalink) Old 09-30-2010, 11:20 PM
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which trans has less miles on it?
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post #5 of 38 (permalink) Old 09-30-2010, 11:20 PM
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I'd take the lowest mile/ best condition tranny and put that in the car. There are aftermarket higher stall torque converters out there.
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post #6 of 38 (permalink) Old 09-30-2010, 11:42 PM Thread Starter
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Well my trans has 172000 miles on it and I was gonna get a 2.7 trans from my local pull-a-part and I dnt think there is a way to tell what the mileage on those so what do u all think I should do? Do u all kno where to get These aftermarket torque converters? Jcwhitney has them for $120 but idk if there anymore out there..
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post #7 of 38 (permalink) Old 09-30-2010, 11:44 PM Thread Starter
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Would I have to get a 2.7 tcm if I did a complete swap or does my computer automatically recognize the swap?
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post #8 of 38 (permalink) Old 10-01-2010, 12:55 AM
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Quote:
Originally Posted by Corydavis224 View Post
Well my trans has 172000 miles on it and I was gonna get a 2.7 trans from my local pull-a-part and I dnt think there is a way to tell what the mileage on those so what do u all think I should do? Do u all kno where to get These aftermarket torque converters? Jcwhitney has them for $120 but idk if there anymore out there..
Well, you don't know if the transmission in a car at the yard is the reason the car is in the yard. Also, they may warranty the one you pull, but if bad you have to yank it back out, get another from the yard, and put it in. So you could be doing 4 transmission swaps.
Easier to do would be just the gear swap. But if you are going to be yanking torque converters, you might as well get a 2.7 transmission from the yard, put in the shift kit, put in the high stall torque converter and then swap it in when you're ready.

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post #9 of 38 (permalink) Old 10-01-2010, 02:15 AM Thread Starter
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So you think I should do a complete swap and install a new converter and shiftkit? If so would you mind telling me where I can purchase both of these items I would greatly appreciate it!
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post #10 of 38 (permalink) Old 10-01-2010, 05:20 AM
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Originally Posted by Daytrepper View Post
...Remove the rear transmission cover, and you'll need the two gears and the chain,...
Just to add: You only need the two gears. The chain is the same regardless of the gear set installed. Sounds like you're going to get the gears from salvage (either alone or in a complete tranny), but I thought I'd mention that you don't need another chain in case you decided to purchase the gears from a dealer (cost used to be well under $100 - not sure if that's still true)
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post #11 of 38 (permalink) Old 10-01-2010, 06:01 AM
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Would I have to get a 2.7 tcm if I did a complete swap or does my computer automatically recognize the swap?
One disadvantage is that your speedometer will be out. There's a 6% difference. With the new gear set, at an indicated 70 mph, you will really be going 66 mph.

So beside the improved pickup going to 60 mph, the speedo will get there sooner too. Don't tell your friends about the gear set change and let them marvel at your much improved 0 - 60 times!

Oh, and tell them that the car only seems to be going slower because it's a high quality ride...
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post #12 of 38 (permalink) Old 10-01-2010, 06:10 AM Thread Starter
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Ok thanks Neva I would rather buy a complete tranny considering it would be a lot easier to swap the whole thing then to actually take the gears and do a swap what do u think? The tranny is only 50 bucks at the scrap yard and there are like 12 different intrepids to chose from..

And intrepidtan is there a way to fix the speedometer after doin the swap?
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post #13 of 38 (permalink) Old 10-01-2010, 06:12 AM Thread Starter
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By the way what is the name of these 2 gears and part number?
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post #14 of 38 (permalink) Old 10-01-2010, 06:57 AM
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And intrepidtan is there a way to fix the speedometer after doin the swap?
Get a compatable* TCM from a car with a 3.89 (typically 2.7L) gear ratio.

* I'm have my ideas about which would be compatable, but there are others here who know better than I. Hopefully they will jump in.

Quote:
Originally Posted by Corydavis224 View Post
By the way what is the name of these 2 gears and part number?
Gears:
04659232 Output Shaft (32 Teeth) for the 3.2/3.5L
04659831 Output Shaft (31 Teeth) for the 2.7L (and some other specific cars)

04659233 Transfer Shaft (33 Teeth) for the 3.2/3.5L
04659834 Transfer Shaft (34 Teeth) for the 2.7L (and some other specific cars)

[notice the last two digits of the part numbers match the tooth count]

Chain:
04659190 Split 2-Piece, Type 42, Trans. Drive
[I don't remember these as two piece, but it's been a while since I looked at my set.]
(As mentioned by others, there is only one chain part number regardless of which gear set (32/33 or 31/34) you are using.)

I wouldn't buy new. Just get a gear set (with chain(s) and shims) from a junk yard.

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Last edited by 98IntrepidTan; 10-01-2010 at 07:02 AM. Reason: more details about chain
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post #15 of 38 (permalink) Old 10-01-2010, 07:51 AM Thread Starter
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K where is the TCM located and should I use one from a 2.7 or is there better ones out there like that increase the performance?

Also would you happen to have a picture on where the gears are so I can get an idea of how to do the swap? Thanks intrepidtan for the information!
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