mr2krazee
Proven Member
- 179
- 2
- Nov 30, 2012
-
spokane,
Washington
My wife and I recently purchased a 99 Spyder GST with a transmission that only had 2nd, 5th, and reverse. We drove it home like that and kept driving our 6.0 swapped trans am while I looked for a replacement transmission to swap in, I had no luck but what I did have was my 1g FWD GST transmission that shifted flawlessly in my old GST.
I began to research the similarities between the two units and found many similarities so I proceeded to remove the 2g transmission for a hands on side by side comparison. I concluded that the two were nearly identical other than the obvious mounts that were different, the speed sensors also differed between mechanical and electronic.
After having a good friend who is not only a fellow DSM owner but also is a journeyman industrial field mechanic with a strong background in transmission rebuilding agree to lend a hand, as well as several air tools and other various goodies that I do not possess. We proceeded to remove the bolts that surround each tier of the cases.
After carefully tapping the outer most case with a rubber mallet we were able to expose the top two shafts one of which is fifth gear and also the shift fork is exposed. We then removed the nuts off the two shafts exposed. After removing the reverse idler bolt on the side of the cases which was a torx on the 2g and a six sided bolt on the 1g the secondary case was free to come off exposing the full planetary gear system contained within the transmission as well as the differential which on both units was an open style diff unfortunately, no posi.
Oh well the Spyder is just a kwick daily driver. We now removed the roll pins from each shift arm and the gears sets came free, we then swapped the 1g gear sets into the 2g case and reassembled the 2g transmission. I'm pretty sure that covers it for the most part if anybody is interested in doing this or is hard pressed for a transmission for their 2g FWD as they are quite uncommon.
The best part of this is that non-turbo 1g transmissions are identical to their turbo counterparts, so you can find them in yards when you want a cheap setup to get going. I have heard the nt trans is geared a bit higher but I have not confirmed this personally.
We had to swap the 1g primary shift fork into the 2g case as the 2g had one less shift fork dowel hole in it. Nearly every component was interchangeable and the only tools we needed beyond the basics was a set of snap ring pliers on hand in case we wanted to swap synchros between gear sets but the 1g synchros were all nice so we decided not to. After reassembly each gear was tested and all checked out with proper functionality.
So there it is, if you need to do this or wonder if its possible for the everyday budget minded real world do it yourselfer the answer is yes. Transmissions aren't as scary as they are made up to be, that is what I learned today with the help of my good friend Don.
I began to research the similarities between the two units and found many similarities so I proceeded to remove the 2g transmission for a hands on side by side comparison. I concluded that the two were nearly identical other than the obvious mounts that were different, the speed sensors also differed between mechanical and electronic.
After having a good friend who is not only a fellow DSM owner but also is a journeyman industrial field mechanic with a strong background in transmission rebuilding agree to lend a hand, as well as several air tools and other various goodies that I do not possess. We proceeded to remove the bolts that surround each tier of the cases.
After carefully tapping the outer most case with a rubber mallet we were able to expose the top two shafts one of which is fifth gear and also the shift fork is exposed. We then removed the nuts off the two shafts exposed. After removing the reverse idler bolt on the side of the cases which was a torx on the 2g and a six sided bolt on the 1g the secondary case was free to come off exposing the full planetary gear system contained within the transmission as well as the differential which on both units was an open style diff unfortunately, no posi.
Oh well the Spyder is just a kwick daily driver. We now removed the roll pins from each shift arm and the gears sets came free, we then swapped the 1g gear sets into the 2g case and reassembled the 2g transmission. I'm pretty sure that covers it for the most part if anybody is interested in doing this or is hard pressed for a transmission for their 2g FWD as they are quite uncommon.
The best part of this is that non-turbo 1g transmissions are identical to their turbo counterparts, so you can find them in yards when you want a cheap setup to get going. I have heard the nt trans is geared a bit higher but I have not confirmed this personally.
We had to swap the 1g primary shift fork into the 2g case as the 2g had one less shift fork dowel hole in it. Nearly every component was interchangeable and the only tools we needed beyond the basics was a set of snap ring pliers on hand in case we wanted to swap synchros between gear sets but the 1g synchros were all nice so we decided not to. After reassembly each gear was tested and all checked out with proper functionality.
So there it is, if you need to do this or wonder if its possible for the everyday budget minded real world do it yourselfer the answer is yes. Transmissions aren't as scary as they are made up to be, that is what I learned today with the help of my good friend Don.
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