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CursedGTR · 02-08-2009, 05:56 AM

For Discussion Purposes - Transmission/GearBox thoughts

Rules - Keep it on topic
- No BS about which is cooler, it is all about what is more EFFECTIVE for my money.

I am considering the following options for my S15 when it comes time for a gearbox.

Let me know what you think, throw in some input on either one of them. I am not looking to be baller or PIMP, I am looking to deliver power effectively over as long a period as possible without blowing shit up everyday.

Option 1 -
RB25DET Mission with O.S. Giken Cross Mission Set and soem treatments from Richmond Gears. Pros: Street Drivable Availability of parts, I have the 25 Case ready to go back, proven to about 750-800 before it blows up and in some cases even more. Cons: Cost (2300.00 or more for the gearsets, plus rebuild kit for the mission, plus shipping cost for the transmission), Clutch replacements are a bitch (triple plate RB clutches are not cheap either); Requires center plate to really deliver power effectively. TOtal cost after it is all said and done = roughly 7K

Option 2
Dog engagement Gearset (PPG), Pros: great shifts and capable of handling the power easily, fitment is not problem, cost effective for a dog mission. Cons: Has to be rebuilt at relatively short intervals (about 5k miles) and rebuild costs are extremely expensive; street drivability decreased, noisy. Cost after it all = roughly 10K to get it rolling

Option 3: O.S. Giken Sequential (OS88) Pros: nice box on the track, no missed shifts, good selection of gear ratio's. Cons: Not traffic friendly, rebuild required often but is not something you get to do in your garage, has fitment issues (need to use GTR Transfer case). Rough cost after it all = 14K

Option 4: Th400 or 4L80E Race prepped transmission with manual valve bodies, and proper stall converter. Pros: Strong, Easy to Repair, Cheap (you can find these things for a couple hundred bucks), driveable on the track and the street without too much compromise, cool options like paddle shift for the 4L80E are available. Cons: Not as fun as 5 or 6 speed, requires external cooling to last long, need numerous parts up front to adapt it. Total Cost up front = Approximately 3-5K based on what transmission is used.

Although Option 4 is the cheapest, I am not necessarily looking for the cheapest option. I am looking for your input and experiences to make a decision. I will NOT drift this car, it may see some highspeed stuff and some drag but other than that it will not see a circuit course.

SO let's discuss.

02-08-2009, 05:56 AM	#852
CursedGTR Zilvia Junkie Join Date: Aug 2007 Location: Birmingham, AL Posts: 423 Trader Rating: (6)	For Discussion Purposes - Transmission/GearBox thoughts Rules - Keep it on topic - No BS about which is cooler, it is all about what is more EFFECTIVE for my money. I am considering the following options for my S15 when it comes time for a gearbox. Let me know what you think, throw in some input on either one of them. I am not looking to be baller or PIMP, I am looking to deliver power effectively over as long a period as possible without blowing shit up everyday. Option 1 - RB25DET Mission with O.S. Giken Cross Mission Set and soem treatments from Richmond Gears. Pros: Street Drivable Availability of parts, I have the 25 Case ready to go back, proven to about 750-800 before it blows up and in some cases even more. Cons: Cost (2300.00 or more for the gearsets, plus rebuild kit for the mission, plus shipping cost for the transmission), Clutch replacements are a bitch (triple plate RB clutches are not cheap either); Requires center plate to really deliver power effectively. TOtal cost after it is all said and done = roughly 7K Option 2 Dog engagement Gearset (PPG), Pros: great shifts and capable of handling the power easily, fitment is not problem, cost effective for a dog mission. Cons: Has to be rebuilt at relatively short intervals (about 5k miles) and rebuild costs are extremely expensive; street drivability decreased, noisy. Cost after it all = roughly 10K to get it rolling Option 3: O.S. Giken Sequential (OS88) Pros: nice box on the track, no missed shifts, good selection of gear ratio's. Cons: Not traffic friendly, rebuild required often but is not something you get to do in your garage, has fitment issues (need to use GTR Transfer case). Rough cost after it all = 14K Option 4: Th400 or 4L80E Race prepped transmission with manual valve bodies, and proper stall converter. Pros: Strong, Easy to Repair, Cheap (you can find these things for a couple hundred bucks), driveable on the track and the street without too much compromise, cool options like paddle shift for the 4L80E are available. Cons: Not as fun as 5 or 6 speed, requires external cooling to last long, need numerous parts up front to adapt it. Total Cost up front = Approximately 3-5K based on what transmission is used. Although Option 4 is the cheapest, I am not necessarily looking for the cheapest option. I am looking for your input and experiences to make a decision. I will NOT drift this car, it may see some highspeed stuff and some drag but other than that it will not see a circuit course. SO let's discuss.