Gearing swap in d series trans, rt4wd, and LSD options

Hey guys,
Long time lurker first time owner. A little info:
First honda at 13yrs of age, 1987 Honda elite, still have it! Next was a 1995 civic hatch. Pretty much stock with cold air, cat back, full eibach suspension, nippon racing 15" with toyo proxes T1S all around. Really fun car! Next, 1999 Civic hatch, built D16 vtec, high compression pistons, new rods, heavily worked over head, high lift cams, full ITB setup, complete dyno tune with hondata, skunk 2 FULL suspension, urethane bushings, fresh and upgraded fuel system and ignition system, seem welded body, custom plexy rear windows, CF hood and rear lip, JDM front and rear spoiler, LED blinker/tail light upgrade with HID projector headlights, nippon racing c3 in bronze, toyo proxes T1R, stock trans with LSD and full gearing swap (5th gear topped out at 122mph). Quite a few other little heres/theres but in the end we netted 171 at the wheels and with the gearing swap it was incredibly quick!!! Never made a trip down the strip but as a daily driver and circuit racer found it to outrun many an S2000, turbo B series etc. Down fall... Less gearing so the fun was over in seconds and only 120 +- MPH.
Today I own a 2000 Toyota Echo with a celica gts 1.8 swap. stupid quick for a stock motor in a tine car! I have had this one for about 3yrs as is and already have a buyer which is good because I am now in the market for a rt4wd wagon! I have absolutely fallen in love! I have a d16 vtec with various rods/piston combos sitting around, a few stock wrx turbos, various injectors, and a bit of close ratio gears from the 99 hatch setup sitting around.
So, this brings me to why I am here today:
After searching this forum for the past 3 hrs I have not really found my answer, or at least, clearly. I want to know if I can exchange gears from other d series trans into the d series rt4wd tranny. It seams that the 89 and on cars have standard d series clutches and splines so maybe also the same gears? I know the final drive is pretty awesome but I would like to make my gear change very close as it was in my 99 hatch. Well, at least have the option to play with gearing and so on.
I figure a front LSD, rear JDM LSD, urethane bushings, built drive/propeller shafts, and so on will allow for a conservative and reliable 220whp. I think this would be the ultimate little honda "anywhere" car. Kinda a rally setup is what I will shoot for. Mud flaps, brush bar, under carriage guards and fully covered in bed liner, brake upgrades, better wheels and tires to suite, mounted spare tire at rear, etc. etc. etc. You know this is now an obsession!
Really guys, I looked for ever and if you're going to keyboard kill me I can't say I will be too amused... Please, for the sake of me asking, if there are already posts on this just send the link. I say in advance you are smarter than I, have a keener eye, can search in ways I just cant and you are the honda king. I just want to join this spread out crew of diamond in the rough cars all over these 50 states and along the way, show off some naughty pics as she comes together.
Thanks in advance to all who offer answers in the interest of helping a project in motion.
Stephen
Long time lurker first time owner. A little info:
First honda at 13yrs of age, 1987 Honda elite, still have it! Next was a 1995 civic hatch. Pretty much stock with cold air, cat back, full eibach suspension, nippon racing 15" with toyo proxes T1S all around. Really fun car! Next, 1999 Civic hatch, built D16 vtec, high compression pistons, new rods, heavily worked over head, high lift cams, full ITB setup, complete dyno tune with hondata, skunk 2 FULL suspension, urethane bushings, fresh and upgraded fuel system and ignition system, seem welded body, custom plexy rear windows, CF hood and rear lip, JDM front and rear spoiler, LED blinker/tail light upgrade with HID projector headlights, nippon racing c3 in bronze, toyo proxes T1R, stock trans with LSD and full gearing swap (5th gear topped out at 122mph). Quite a few other little heres/theres but in the end we netted 171 at the wheels and with the gearing swap it was incredibly quick!!! Never made a trip down the strip but as a daily driver and circuit racer found it to outrun many an S2000, turbo B series etc. Down fall... Less gearing so the fun was over in seconds and only 120 +- MPH.
Today I own a 2000 Toyota Echo with a celica gts 1.8 swap. stupid quick for a stock motor in a tine car! I have had this one for about 3yrs as is and already have a buyer which is good because I am now in the market for a rt4wd wagon! I have absolutely fallen in love! I have a d16 vtec with various rods/piston combos sitting around, a few stock wrx turbos, various injectors, and a bit of close ratio gears from the 99 hatch setup sitting around.
So, this brings me to why I am here today:
After searching this forum for the past 3 hrs I have not really found my answer, or at least, clearly. I want to know if I can exchange gears from other d series trans into the d series rt4wd tranny. It seams that the 89 and on cars have standard d series clutches and splines so maybe also the same gears? I know the final drive is pretty awesome but I would like to make my gear change very close as it was in my 99 hatch. Well, at least have the option to play with gearing and so on.
I figure a front LSD, rear JDM LSD, urethane bushings, built drive/propeller shafts, and so on will allow for a conservative and reliable 220whp. I think this would be the ultimate little honda "anywhere" car. Kinda a rally setup is what I will shoot for. Mud flaps, brush bar, under carriage guards and fully covered in bed liner, brake upgrades, better wheels and tires to suite, mounted spare tire at rear, etc. etc. etc. You know this is now an obsession!
Really guys, I looked for ever and if you're going to keyboard kill me I can't say I will be too amused... Please, for the sake of me asking, if there are already posts on this just send the link. I say in advance you are smarter than I, have a keener eye, can search in ways I just cant and you are the honda king. I just want to join this spread out crew of diamond in the rough cars all over these 50 states and along the way, show off some naughty pics as she comes together.
Thanks in advance to all who offer answers in the interest of helping a project in motion.
Stephen
Comments
This is the rt4wd transmission exploded.
http://www.hondapartsnow.com/online/Pag ... fferential
heres a stock 1990 crx si 5spd open diff
I have a huge pile of both RT4WD gears as well as FWD D series gears here, and if I get a moment, I'll compare some of them to see how compatible they might be.
Well unless you want to get REALLY complicated and do stuff like swapping out 5th gear etc. you really don't need to worry about all of those gears. Not 100% sure about the ZC but I know that ALL of the 1-5 gears and shafts on the 89-91 5spd civic transmissions are exactly the same. The 88's have the same gears, but the spline # on the shaft is different. You're probably thinking about final drive ratios right? To change the final drive all you really need to do is use the ring gear off of the differential (or the whole differential in some cases) of the transmission which has the final drive that you want and put it in your transmission. Your problem is that the DX transmission has 35mm diff bearings, and there is a counter-bore in the transmission housing which is 35mm.......the Si transmission has 40mm differential bearings. So you can't just take the diff out of an si transmission and put it in your car. Long story long, buy an Si transmission, then see if you want to change the final drive. It'll be cheaper and easier for you in the long run.
I have done lots of gear swapping in the 88-91 transmissions. The best setup I ever ended up with was in my 89 hatch Street Modified autocross car. I had the ZC 1st to 5th, and the JDM Integra ZXi (RT4WD Integra) 4.4375:1 final drive. That shit ripped. Sure, 75mph in 5th was 4,000rpm, but the car, along with the optional JDM Civic LSD (O.S. Giken, same diff as the ITR, but sized for the Civic L3 tranny) and the supercharged D series in a 1,900lb car was an absolute blast! Oh, had a 7 1/2lb flywheel too!
Pretty much all the 1988-1991 Civic FWD gears can be mixed and matched. I do know that some of the EG and EK D series gears can also be swapped, but I have no experience with those, so can't offer any advice.
Looking at a table of the gear ratios...... even if they would fit, it looks like it wouldn't really be worth the effort to use the 92-95 si 1-5 gears unless you happen to have your tranny split apart and happen to have those gears sitting next to you.
http://www.knology.net/~jediklc/gearratiosdseries.htm
Matt, I didn't do the shimming myself. I trusted the "experts". I took it to a place called Gears and Rears. I did the initial grinding of 2 ring gear bolt holes just to prove the concept, and then had a machine shop open up the other 8 holes.
Alexander, if any of the transmissions your going to "chunk" is RT4WD, I'll gladly pay shipping and take it off your hands.
http://store.phantomgrip.com/catalog/pr ... 40df319097
Phantom Grip Part No. PGHO1334 is for the 4wd wagon. But if you want to be really cool you can get the one for a '66-'70 Honda S800, because the part number is PGHO1337
Is this confirmed information? Im having troubles finding gearsets for my rt tranny, but if this is correct, you just made my day.
Been looking around the quicklinks, but cant find the RT gear ratios. Is this info available?
Bottom of the page!
Any ideas on where to purchase gearsets from for the RT?