Thread: 01 gtp tranny question

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  1. #1 01 gtp tranny question 
    GTP Level Member dazedandconfused's Avatar
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    I have a 01 with 155k on it and 4th gear is gone. Found a junkyard tranny but he don't know if it's a HD or out of a non SC car. Has around 100k on it. My question is what can I read on the tag to see if it's a HD tranny? If it's not how can I covert it over. I obviously know from using the search function the diff and converter need swapped but I can't find any working links that show me how to. No one rebuilds these transmissions in my area anymore. Getting it tuned for the different ratio isn't an issue and I read something about the passenger axle shaft being different which isn't a big deal. Anyone have any useful info on this subject?

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  2. #2 Re: 01 gtp tranny question 
    Turbo is the way to go. BillBoost37's Avatar
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    Skip the tag and measure the size of the differential cover. The HD cover is longer than the non-HD. That's the quickest way to tell. Also look at how your transmission lines connect to the trans.

    If it's HD there are 37 drive teeth and 33 driven teeth so it's 1.121 ratio, Non-HD is 35 and 35 is 1.00 ratio. After those ratios the diff makes the rest of the difference. Shoot a pm to Scottydoggs or if you find a link to Dropbox from him the rebuild manual is in there.

    Heres the torque converter How to install a torque converter onto the transmission
    In case you need removal of a trans: How to remove a transmission

    I know I've got diff removal somewhere. ... where though? You remove the bolts for the diff cover, then put a large screwdriver into the diff where the output shaft sits and give it a quick hard smack with a hammer. The circlip will release and you'll have the diff out. To reinstall slide the output shaft about 3 inches to the other end of the transmission, put diff in place and cover (if cover does not sit flush by hand there are is a bearing behind diff and parking pawl that needs to be reset (use a dab of grease to hold it in place) on. Then slide output shaft back to the diff and with a block of wood on it.. give it a smack to reseat it.
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  3. #3 Re: 01 gtp tranny question 
    GTP Level Member dazedandconfused's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    Skip the tag and measure the size of the differential cover. The HD cover is longer than the non-HD. That's the quickest way to tell. Also look at how your transmission lines connect to the trans.

    If it's HD there are 37 drive teeth and 33 driven teeth so it's 1.121 ratio, Non-HD is 35 and 35 is 1.00 ratio. After those ratios the diff makes the rest of the difference. Shoot a pm to Scottydoggs or if you find a link to Dropbox from him the rebuild manual is in there.

    Heres the torque converter How to install a torque converter onto the transmission
    In case you need removal of a trans: How to remove a transmission

    I know I've got diff removal somewhere. ... where though? You remove the bolts for the diff cover, then put a large screwdriver into the diff where the output shaft sits and give it a quick hard smack with a hammer. The circlip will release and you'll have the diff out. To reinstall slide the output shaft about 3 inches to the other end of the transmission, put diff in place and cover (if cover does not sit flush by hand there are is a bearing behind diff and parking pawl that needs to be reset (use a dab of grease to hold it in place) on. Then slide output shaft back to the diff and with a block of wood on it.. give it a smack to reseat it.
    All great info Bill. Trans works great aside of the 4th gear being shot would it be worth replacing the 4th gear hub? I have no 1811 code or any other codes just no 4th gear? Worth it?

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  4. #4 Re: 01 gtp tranny question 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by dazedandconfused View Post
    ...would it be worth replacing the 4th gear hub? I have no 1811 code or any other codes just no 4th gear? Worth it?
    If you are mechanically inclined, I would say yes. It would also be a great time to instal a shift kit. Having the side cover off gives you access to the part of the kit that usually get left out. 2 birds, one stone.
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  5. #5 Re: 01 gtp tranny question 
    Turbo is the way to go. BillBoost37's Avatar
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    I've done it .. Brandon's done it. You could.l
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  6. #6 Re: 01 gtp tranny question 
    GTP Level Member dazedandconfused's Avatar
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    Ok planning on doing the 4th gear hub, along with a shift kit. Gunna kill 2 birds with one stone and do my headers while the cradle is lowered. On that note, would it be benificial to pull the trans out all the way to do the 4th hub or not? And do I need any other parts besides the 4th hub?

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  7. #7 Re: 01 gtp tranny question 
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    Quote Originally Posted by BrandonHall10 View Post
    If you are mechanically inclined, I would say yes. It would also be a great time to instal a shift kit. Having the side cover off gives you access to the part of the kit that usually get left out. 2 birds, one stone.
    What part is that?

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  8. #8 Re: 01 gtp tranny question 
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    It's been a looong time since I had those instructions in my hands. I want to say the 3-4 accumulator.
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  9. #9 Re: 01 gtp tranny question 
    Turbo is the way to go. BillBoost37's Avatar
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    I think that's the right name.
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  10. #10 Re: 01 gtp tranny question 
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    if it's a transgo kit, the only thing in the side cover is that 4th gear accumulator. 2 & 3 are in the pan, bolted to the case.

    the actual hubs are a whole different story, that's a complete tear down.
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  11. #11 Re: 01 gtp tranny question 
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    Quote Originally Posted by dazedandconfused View Post
    Ok planning on doing the 4th gear hub, along with a shift kit. Gunna kill 2 birds with one stone and do my headers while the cradle is lowered. On that note, would it be benificial to pull the trans out all the way to do the 4th hub or not? And do I need any other parts besides the 4th hub?

    Sent from my SM-G973U using Tapatalk
    Anymore input on this? Would doing a gemini chain be a good idea too? Or will clutches and/input shaft give problems before the drive chain?

    Goal is to run a 3.4 pulley when the dust settles so would a shift kit and gemini chain hold up for awhile driven fairly conservatively?

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    97 gtp, cone filter mod, downpipe and glasspack to stock muffler mod, 180* t-stat mod, bad driver mod
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