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Old 01-29-2008, 12:19 AM   #1
nitsua y zarc
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Default Help with transmission switch

I am undertaking a fairly huge task this week (for me at least) - I am replacing my transmission. I have a 01 SOHC with the tranny already pulled out of the engine bay. I just acquired an 02 DOHC (MP3) tranny. I want to weld the diff pin on this "new" tranny (my last two trannys have blown the diff pin)

1) I was unable to find a "how-to" on welding the pin. I have a welder that is willing to do it for me. So if I had a general idea as to where he needed to work, it would help us both out.
2) Also, Are their any other guides (how-to's) to replacing my trans other than wolfman's auto-transaxle guide (I have a 5-speed)?
3) Lastly, there should be no problems with switching from a MP3 to a MP2 - right?
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Old 01-29-2008, 12:27 AM   #2
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Default Re: Help with transmission switch

I assume no longer pounding the piss out of your car isn't an option?

The transmission needs to be fully diassembled to weld the diff pin.
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Old 01-29-2008, 01:12 AM   #3
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Default Re: Help with transmission switch

Quote:
Originally Posted by nitsua y zarc View Post
2) Also, Are their any other guides (how-to's) to replacing my trans other than wolfman's auto-transaxle guide (I have a 5-speed)?
3) Lastly, there should be no problems with switching from a MP3 to a MP2 - right?
if you look again, he wrote a How-to for a manual also. Those are probally the best guides. i wrote 2 debriefs about some of the problems i encountered during my swap. they might help you out.

the tranny's will bolt up fine. however your cruise control (if you have one) will be off bc of the different gear ratios
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Old 01-29-2008, 03:02 AM   #4
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Default Re: Help with transmission switch

Quote:
Originally Posted by nitsua y zarc View Post
I am undertaking a fairly huge task this week (for me at least) - I am replacing my transmission. I have a 01 SOHC with the tranny already pulled out of the engine bay. I just acquired an 02 DOHC (MP3) tranny. I want to weld the diff pin on this "new" tranny (my last two trannys have blown the diff pin)

2) Also, Are their any other guides (how-to's) to replacing my trans other than wolfman's auto-transaxle guide (I have a 5-speed)?
3) Lastly, there should be no problems with switching from a MP3 to a MP2 - right?
2) There are a couple excellent write-ups on 'in car" clutch replacement that will give you the details on mating the transaxle back to the engine.

http://www.cristhomas.com/cars/Clutch/ClutchHowTo.html

A forum member, Lowsaturn, pointed out he removes the axles from the hubs by disconnecting the tie-rod ends instead of the ball joint. Another member tried it without success. YMMV!

3) It has been pointed out that the cruise control function in late model PCMs may not function after the swap due to differing gear ratios between the SOHC and DOHC transmissions.
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Old 01-29-2008, 07:12 AM   #5
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Default Re: Help with transmission switch

This link shows how to take the tranny apart to get to the diff pin. That said, you realize that that DOHC tranny is geared differently. It's not going to give you the best mileage and performance. If I were you, at a minimum, I'd swap the 5th gear from the SOHC in there.
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Old 01-29-2008, 12:10 PM   #6
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Default Re: Help with transmission switch

I found a transmission shop that was able to weld the diff pin without disassembling the transmission. They had to machine a portion of the threads for the speed sensor away to gain access. I really don't know how they were able to do it in such a small space but I inspected it with a flashlight and it was indeed welded in. Good Luck!
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Old 01-30-2008, 12:23 AM   #7
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Default Re: Help with transmission switch

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I found a transmission shop that was able to weld the diff pin without disassembling the transmission. They had to machine a portion of the threads for the speed sensor away to gain access. I really don't know how they were able to do it in such a small space but I inspected it with a flashlight and it was indeed welded in. Good Luck!
Hooley cow! I've seen some threads speculating about doing it that way but most people were afraid of "inadvertant" welds happening along the ground path since it's a little difficult to get the ground clamp directory onto the part being welded.
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