Jump to content
SAU Community

Recommended Posts

Hello everyone. I own a r32 gtr thats highly modified. But no gear box mods. For the first time I'm braking Mt gear box one right after the other. I drag race and over the years I have been building more and more power. After my first gear box failure I right away ordered 3 extra gear box.

On a side note I drag race on the air port strip that has no track bite. I keep on breaking 3rd gear no matter how easy it try to shift the gears. I'm simply tired of this. Here is my question.

 

What do you guys think would be the easiest and cheapest way to hold the stress I'm putting on these gear box. What's crazy is on my lowest setting 10psi I'm breaking by gear box. Like wtf.

I drive hard and I'm unforgiving in hoe I shift. Would a PPG get set work or would your guys recommend a full sequential box. Can anyone provide links to the parts I'll need. I'm simply sick and tired of these box problems.

Link to comment
https://www.sau.com.au/forums/topic/469963-keep-breaking-gear-box/
Share on other sites

The PPG gearsets are pretty good but rely on the stock housing / shaft sizes and positioning - ultimately this is what limits the strength of the box as material improvements can only take things so far. The feedback from PPG owners is normally positive (and it should be given the price!) but given what you are saying the OS-88 might be the way to go as a "do it right the first time" approach.

if you are looking to shave even more time off your timeslips while assuring that you aren't spraying gearbox parts everywhere (and I know I am going to be accused of heresy for this..) a built powerglide and suitable converter might potentially be more suitable for your current & future requirements in the end and for less / similar money as trying to put together a bombproof 5speed or going OS-88. 

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

If you're gonna spend the amount of coin to go down the PPG dog set, I think you're crazy not to spend the extra little bit more and get a 6 speed of some sort.

A couple years ago I was in a similar situation and after 12 months of debating, I chose the OS88. It woke the car up heaps... the extra cog is worth its weight in gold.

Getrags seem to hold up very well, perhaps that's an option to look at? Anything "higher" then that is crazy money, irrespective of what you decide. It's a bugger of a spot to be in.

  • Like 1

Thanks for that link mate.
I was wondering has anyone used the os giken close ratio gear set. Looks like a Cheap in between budget build. I see that's offer from rhdjapan with center plate for around 2800 usd. It's just a thought.

If you're gonna spend the amount of coin to go down the PPG dog set, I think you're crazy not to spend the extra little bit more and get a 6 speed of some sort.

A couple years ago I was in a similar situation and after 12 months of debating, I chose the OS88. It woke the car up heaps... the extra cog is worth its weight in gold.

Getrags seem to hold up very well, perhaps that's an option to look at? Anything "higher" then that is crazy money, irrespective of what you decide. It's a bugger of a spot to be in.

 

 

Yeah. I totally agree, as bad as I hate the idea of going down this road. I feel I have no choice. I was just putting some ideas out there to see if there was a cheaper solution, but seems like there's none. Forgive me if I sound uninformed at times. I have never been in this situation before. Drive line issues. What a drag. How did your install go with the os88 if you don't mind shinning some light on the situation. I'm planning on sourcing one from rhdjapan. Also did yours take the 4 months there saying it takes to build. ??

 

43 minutes ago, MJTru said:

Thanks for that link mate.
I was wondering has anyone used the os giken close ratio gear set. Looks like a Cheap in between budget build. I see that's offer from rhdjapan with center plate for around 2800 usd. It's just a thought.

I busted a second gear.

You need a torquey car to get the best out of those tall ratios. Cheap enough but not THAT strong. Many guys on here have busted them.

IMG_2887.JPG

11 minutes ago, MJTru said:

 

 

Yeah. I totally agree, as bad as I hate the idea of going down this road. I feel I have no choice. I was just putting some ideas out there to see if there was a cheaper solution, but seems like there's none. Forgive me if I sound uninformed at times. I have never been in this situation before. Drive line issues. What a drag. How did your install go with the os88 if you don't mind shinning some light on the situation. I'm planning on sourcing one from rhdjapan. Also did yours take the 4 months there saying it takes to build. ??

 

Mine took 8 months from full payment to receiving it. You also have to pull it apart and fix up the oil breather. YOU HAVE BEEN WARNED! I have made a post about it all.

The car will be back on the road in a month or so's time. I've so far only done 100 ish kms in it. 

I busted a second gear.
You need a torquey car to get the best out of those tall ratios. Cheap enough but not THAT strong. Many guys on here have busted them.
IMG_2887.thumb.JPG.eeeb3ad993b81e4501b1a751879376d7.JPG



I have made my mind up. 88 is the way.
I see you mention in another thread the oiling problem and a cover that was needed for the breather hole. How did that go.? Your good now. Also have a photo of what you did.? Would be helpful. Also the sensor in the box what was your reason for moving it.?
Just now, MJTru said:

 

 


I have made my mind up. 88 is the way.
I see you mention in another thread the oiling problem and a cover that was needed for the breather hole. How did that go.? Your good now. Also have a photo of what you did.? Would be helpful. Also the sensor in the box what was your reason for moving it.?

 

 

I don't have the after photos unfortunately. Basically a cover plate went over the breather.

The gear position sensor got changed for something more modern and to be used with a strain gauge nob. The factory one is just a bunch of "switches".

 

2 hours ago, MJTru said:

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

Yes they certainly are able to be done in 4WD - RIPS had a nice setup a while ago in their MEGAWOT vehicle running into the 7's and there are a few companies who make RB AWD adaptors for the powerglides locally (KEAS and a few others). I only suggest the powerglide as they are fairly cheap to build tough (in comparison to other options) and help with getting the car off the line a lot smoother and more reliably than most people can manage with a manual.

2 hours ago, MJTru said:

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

Rips has built an AWD powerglide. I don't know if he will share the info with but you could try. He would probably sell you a built up unit though.

  • Like 1

I have 3 cars that are all 4wd vehicles. The 2 gtrs I really like. So I might just get 2 os88 for those 2. The other one is a mix up machine. It's a gts4 with all gtr parts. All 3 cars are good for about 700 to 800 hp very easily. So I will have to find a cheaper solution for the gts4. Out of a gear sets and a centerplate being os giken. I might as well try the os close ratio gear set for 2800 from rhdjapan japan. The gts4 runs small wheels and street tires so they tend to spin. I think that helps with stress on the drive train. The power glide will be my very last option. After I checked around that's about 10k plus for the complete setup.

I love how in your other thread you were trying to fit the cheapest shitest wheels around but now you are talking of buying 2 boxes that are worth about 18k aud each plus another box worth around 3k like it's nothing at all

  • Like 2

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Surely somebody has one in VIC. Have you asked at any shops?  Is this the yearly inspection or did you get a canary?
    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
×
×
  • Create New...