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Should I index my bellhousing?

Do you need to index your bell?
I do recommend checking runout on all bellhousings with an index plate. Yes, including the cast aluminum bell I sell. Any performance transmission setup should be within .005 runout of centerline. When I first setup these cast JZ bells I was really confident we would not have to do any indexing, we had 10 blocks we used for getting data... but after sending out 400+ of these bells we have found more inconsistencies in the blocks. We started noticing more and more customer's toyota blocks who are more out of spec than others. 

Machining Tolerances
We are within .002 on the bells, and consistent, so the inconsistency comes from the blocks... For example, i can take a few of my bells on the same block back to block and get pretty consistent numbers. But if you take one of my bells and try it on 10 different blocks the consistency does not follow. this tells me its a cast block machining tolerance issue.

What are your odds of being out of index?
While it is a smaller percentage (about 15 in 400 bells sold) that have shown an out of index condition, so I think it is better to play it safe and just check these to be sure. Out of index can cause premature failure of the input bearing as well as uneven wear and heat in the input gear. A tell-tale sign of an out of index bell can be a lot of rollover noise coming from the transmission. This is due to a side-loading condition on the input which over time can cause transmission issues. I do index plate rentals for any customer who purchased a bell or kit from me. 

To remove your stock dowels, i recommend soaking them in a penetrating oil and let them sit overnight. Use a pair of heavy duty vice grips and slowly work them back and forth. If the get tight, heat applied to the block around the dowel may be needed

Here is a quick video I did on indexing and offset dowel install:

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WE WON the Stick Shift Class FL2K 6.69 @ 221 mph !! VIDEO BY ThatRacingChannel

FL2K 2022 was the first setup on Orange Man's new 4-link solid axle setup. We struggled and did not get a good qualifier until pass 5 of 5... After we got it figured out, we slowly started bumping up the power. This video does a good job of showing that progression.

Grannas Racing Supra FL2K22 FL2K 2022 winner stick shift video thatracingchannel

The video below is the best TRC has done on my car by far! In the video you will get to see improvements pass to pass, but not only that you will get inside info on the setup of the car and also get to see me working on the clutch. One of my favorite parts is where I am working on the clutch saying "we are going big" right before the last pass where we win the event with the 6.69 @ 221mph pass!

By far my favorite video done so far, thanks to Javier and the crew at That Racing Channel! 

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New Grannas Racing Offset dowel pins - when and how to use them

On a performance transmission setup I always recommending indexing your bellhousing to be within five thousandths of an inch of total runout. Most of the time it is the factory block that varies in tolerance, but with multiple parts stacking up together, and a slim .005 window, the tolerance can get out of spec quickly. In this video I will try to lead you through a quick process on getting you in spec.

Offset dowel pin runout index bellhousing toyota 2jz 1jz rotary 13b 20b honda k20 k24 f20 f22c

All of my cast aluminum bellhousings are precision CNC machined to within .002 but that doesn't mean your OEM block is on center. So always check to make sure!



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Tremec T56 Magnum CLOSE ratio vs WIDE ratio. Which is best?

I get this question a lot! But honestly for me it’s an easy choice because of experience with so many different cars… Especially when dealing with import cars with these 6-speed t56 magnum transmissions.

 which is better tremec close ratio or wide ratio t56 magnum-f XL

Tremec calls the wide ratio “WIDE” because of the WIDER or BIGGER gear splits on 1-4 gears… So before I talk about this further, try to think of how a bigger gap in between gearing effects a car on shifts?

A larger gear split causes for a bigger RPM drop on shift, which results in bigger loss of boost, more lag on each shift. On a small displacement car, like most imports, this is of utmost importance! You want to minimize the car falling out of RPM and boost on shifts, which is inevitable, but the close ratio transmission will help a lot with this. Especially on the 3-4 shift.

I can tell you from experience, that I sell 99 close ratio boxes to every 1 wide. I try to talk to customers and ask why they want the wide ratio and normally after I talk to them about it they will change their thought process and go with the close ratio. Some guys are stuck on it because they want that shorter first gear. But you can not, and should not be picking a transmission based on first gear alone.

The proper way to do this is setup your rear gear to match the transmission. This will give you an ideal overall gearing setup and it will work beautifully. Normally something in the 3.70-4.30 range, depending on tire height with something around 4.10 usually being the sweet spot. If you are a V8 with lots of low end torque you may want to go with taller 3.73 gearing. If you have a small displacement motor like a rotary car or 4cyl with low torque you may want to go to something like a 4.30 gear.

Picking the proper gear depends on 3 things.

  1. your RPM limit
  2. tire size
  3. horsepower 

You can use TREMEC’s calculator to fine tune your gearing choice! 

If you want pricing on a complete transmission kit or any of the Tremec transmission offerings please fill out

Magnum-F Part numbers below:

Magnum-F Part numbers close ratio wide ratio

Magnum Part numbers below:
Tremec Magnum part numbers close ratio wide ratio

Magnum XL part numbers below:
Tremec part numbers Magnum XL mustang close ratio wide ratio


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What Fluid to run in your Tremec transmission and what is the break-in process?

I get this question quite frequently and I figured the best way to address it is to make a quick tech article on recommendations. When you get your brand new Tremec transmission you will see an orange ticket on the side that says "no fluid" which means the transmission ships dry to you. You will need to add fluid before you start driving the car.

What I recommend for a 200-300 mile break-in period (easy driving, no burnouts, flat shifts, no high RPM hard/quick shifts) basically just taking it easy for those miles. I recommend 2-3 heat cycles during this period, so basically put 40 miles on it, let the trans cool down overnight or whatever, and then bring it back to temp, then cool down again.

For this break-in period I recommend using any cheap, over the counter ATF Dex3 (Auto transmission fluid - Dexron-III) or compatible fluid. This should be a non-detergent fluid, you do not want it foaming up inside the transmission.

DEX3 ATF Tremec T56 Magnum recommended break-in period

The transmission capacity is 3.75 quarts, so you will need 4 quarts of fluid to get you on the road.

IF you are on an upgraded trans with all carbon synchros (like my GR1000 units) then you do not want to run heavier fluid, the carbon synchros do not like the heavier weight fluid, i recommend just running a quality name brand ATF DEX3 fluid.

IF your transmission is not a OEM or "GR700" kit unit, then after the break-in period I recommend going to a slightly higher viscosity fluid (75W85), which will help protect the gears at high RPM, yet still allow the synchronizers to work as they should. The higher viscosity fluid will also help a little bit with rollover noise, as it helps take up that "gap" or space between the gear teeth. 

I have had guys ask "why can't i just run shockproof or heavier weight oil"... and the reason to not go to a SUPER heavy fluid is this will make the synchronizers not move as freely and can cause a "notchy" feeling and will lead to grinds, which will shorten the life of the synchronizers.

The fluids I recommend, in the order of preference are as follows: Tremec MTF, Redline MT85, and Motul 75-85. If you are outside the USA or in a place where Tremec MTF is not available i recommend the Redline or Motul option.

I have the Tremec MTF fluid available for purchase on my website, and I try to keep it in stock. It is sold as a case of 4 quarts.

Hopefully this not only helps you, but also helps me as I will get the question less often!



  • Break in period - 200 to 300 miles - use ATF DEX3
  • For built transmissions with all carbon synchros (GR1000) --- AFTER break-in use a good brand ATF DEXRON-III fluid (Valvoline, Motul, Amsoil, etc)
  • For Stock transmissions or GR700 kit transmissions --- AFTER break-in use Tremec MTF, Redline MT85, or Motul 75-85
  • Capacity 3.75 quarts (T56 Magnum, Magnum-F, Magnum XL).
  • Capacity 2.8 quarts (TKO / TKX / T5) 


Tremec MTF Fluid break-in period ATF DEX3

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Cast bell changes and updates - MADE IN THE USA!

In this video i talk about some changes I am making to our cast bell program. These bells are now made in the USA entirely, they are cast in Ohio, and machined in Pennsylvania. 

grannas cast JZ t56 bellhousing

I am also going to talk a bit about a few rare instances we found where JZ blocks varied in tolerance and how that affected the bells runout. We machine these within VERY tight tolerances but unfortunately the toyota blocks seem to vary more than i thought. 

In the past year I have sold over 350 bellhousings, and of those 350 only 4 have had issues with indexing, so it is VERY rare, but just to ensure that all bases are covered I will be including index plate rentals with every cast bell. It is better to check and find that it is OK. There are too many tolerances that combine which can create a runout issue.

Sorry for the one-take video I did but it should explain everything pretty clearly


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Grannas Racing RHD MKIV Supra single turbo kit fitment

A lot of customers have asked "Will your turbo kit fit a RHD supra?" Well, I wanted to verify this for 100% certainty before I said yes, so here are the results.

This is showing fitment of our single 60mm gate setup with a Tial/Xona turbocharger, but the most important part on the RHD is clearing the steering rack's intermediate shaft. And as you can see, it clears without issue.

This will hold true for any of the setups with the single gate setup. So T4 open or T4 twin-scroll / divided, PTE vband inlet (non-promod) or XONA/TIAL vband inlet. You can see these options on the Grannas Racing Turbo Kits page.

I will be testing the twin 44mm gate setup next, but for now the single 60mm gate kits will fit like a glove! 

You can also see our RHD Supra clutch master cylinder kit fitting nicely as well.

RHD Supra MKIV Turbo kit grannas racing xona tial precision pte garrett

RHD Supra Toyota MKIV JZA80 2JZ single turbo kit fitment

Grannas Racing single turbo kit rhd supra mkiv jza80 is300 sc300 2jz swap

Grannas racing supra midpipe downpipe turbo header manifold tubular rhd lhd







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Tilton ST246-HD will drive like a daily but can hold 1500 horsepower

In this video one of my customers Mo's shows his 1000+WHP S14 240sx and just how amazing it drives with the GR700A T56 Magnum kit along with the Tilton ST246-HD clutch. This is the Heavy Duty version of the Tilton ST246 clutch, but as you will see in this video it drives amazing.

Tilton ST246-HD clutch

The ST246-HD clutch is rated for 1250 ft lbs of torque, so on a 2JZ application this clutch can pretty much hold 1500WHP.

The standard duty ST246 clutch is rated for about 950 ft lbs, so it can hold about 1000WHP on a 2JZ setup. I recommend this clutch for pretty much any car making between 600whp and 1000whp.

The GR700A kit uses Grannas Racing's new cast aluminum bell housing which makes for an easy installation, quieter performance, and easier serviceability. This kit combined with the Tilton ST246 clutch provides the ultimate combination in comfortability and drive-ability in a manual transmission application. I offer the GR700A kit for almost all the common 2JZ/1JZ swap applications and even offer a universal kit for cars that are not as common.

All of Grannas Racing kits are a bolt in setup, and include all the hardware, to make a seamless, easy install without any need to run to the hardware store for hardware or any need to make another order for missing parts.

Rather than purchasing off of my website, I highly recommend letting me work up a quote specifically for your car. This is an easy process using my quote form

View all of the kits I offer

More videos of the ST246 clutch

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Complete Grannas Racing Supra 8.8 rear kit install video

In this video Ryan Scott from Pure Function installs one of our complete 8.8" Ford rear kits. In the video Ryan covers every aspect of the install, from the removal of the OEM toyota differential, to swapping the ABS tone rings onto the new axles, to setting up the pinion angle.

MKIV Supra SC300 8.8" ford rear end differential install video

The kit Ryan chose was the MKIV Supra kit, with DrivesshaftShop Level5 axles, and aluminum driveshaft. He chose the thunderbird rear differential for his 1100HP build and we sourced the core and built and assembled him a complete setup ready to bolt into the car. No need for trying to find a pumpkin, we got it covered! He only had to add the oil, and bolt the differential into the car.

I recommend the 8.8 kits for those looking for a strong, quiet, street car differential. You can find our 8.8" kits on the website under the differentials section. We make a few different 8.8 kits but the most popular kits I offer:

MKIV Supra 8.8 rear kit

IS300 Ford 8.8 rear end kit

Subaru BRZ / Scion FRS / Toyota 86 8.8" rear end kit

If you are interested in pricing on a full kit, please fill out this form and I will work it up based on your car

Take some time to watch this comprehensive guide on the install. The only thing not covered here is the optional PRO LEVEL wheel hub install, which basically requires pressing off the OEM wheel hubs and installing the billet DSS Pro wheel hubs which are good for 1500HP Supras.

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Dan Dulac's MK2 Supra with GR700A transmission kit - 2JZ swap

Check out Dan's "time capsule" MK2 supra. This is such a clean, well thought out build, with everything done right. Take a look through these pictures and his video below!

grannas racing gr700a mk2 supra mkii 2jz 1jz t56 swap kit

mk2 supra GR700A t56 swap kit 2jz 1jz 6-speed tremec magnum

This 2JZ swapped MKII Toyota Supra is utilizing one of our GR700A transmission kits along with the complete McLeod Single disc setup with Tilton release bearing, the Grannas Racing MK2 master cylinder adapter kit, to make everything bolt in and drive super smooth.

Grannas Racing supra aluminum t56 bellhousing 2jz 1jz tremec magnum-f

The new GR700A kit uses our new cast aluminum bell which is recommended for easier installation and quieter operation in a street car, along with a larger service window for clutch or release bearing servicing.

grannas racing GR700A transmission kit MK2 MKii toyota supra t56 magnum 2jz 1jz

Thanks Dan for sharing your build with us and choosing my transmission kit for your build.

Here is his video

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