Ultimate 8.8 Ford 8.8" Rear End Swap Kit for Lexus IS300

The "Ultimate GR88" 8.8 conversion kit for the Lexus IS300 utilizes our new HD Cast 8.8 differential cover. The cover features main cap supporting load bolts, a breather port, a rear fill port, a side fill port, and drain port. The rear cover uses a bolt on mounting plate which allows the cover to be mounted directly into your car with no modifications.

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The GR88 Ultimate kit has the following advantages:

1. GR88 Ultimate rear diff cover, which offers higher fluid capacity for better gear lubrication, better cooling and less fluid volatility (no catch can!)
2. Cover has breather port at 2 o'clock position for less "splash out"
3. Easy maintenance - back AND side fill ports allows oil changes while diff is in car
4. Precision CNC machining - always square and will always seal without leaks
5. Deeper bowl for big gear clearance. Previous cover setup had clearance issues with larger gears
6. Easy install, one-step install process with load bolts. No more installing cover, then setting up load bolts, then uninstalling to seal and add on the rear cage. 

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The Ford 8.8 is a great bang for your buck rear end. It has many many gear options available, which makes it not only very affordable, but also very flexible!

This kit will ONLY work with the 2003-2004 Cobra case (also lincoln Mark8 1993-1997), or the cast iron Ford Thunderbird (1989-1997) case. The cast iron thunderbird is the strongest case. 

The Grannas Racing kit will allow you to bolt in this strong, affordable rear end kit into your car with out any cutting or fabrication. The kit is 100% bolt in, and used your factory rear subframe mounting holes. The mounting parts also come with a lifetime warranty! I am confident they will hold whatever you throw at them!

THIS KIT IS NOT SOLD WITHOUT AXLES.

I offer two options for axles: 

Level 5 Axles:
These are "direct-fit" and require no work other than bolting them in. These axles feature a billet outer stub that will bolt-in to your factory wheel hubs. These axles are good for around 1000hp.

PRO Axles:
The heavy hitter option is the Driveshaft Shop Pro-Level 1400HP axles, which include a heavier bar and also upgraded spline, billet outer wheel hubs. The hub is a weak link in extreme power cars, so these will be only for the really big power guys. I recommend them for 1000+HP cars.

The Grannas Racing 8.8 Kit Includes:

1. Grannas Racing HD Cast aluminum rear diff cover
2. Rear mounting plate
3. Front mount
4. All hardware required for installation
   
5. Prothane polyurethane front mount bushings
   

Axles are normally in stock. Aluminum or Carbon Fiber driveshafts can be made for any transmission combination, i stock a lot of these as well. If you do not see your transmission listed, we can make it custom after you give us a measurement.

You can have a local shop mustang/domestic shop build your junkyard 8.8. I can provide all the rebuild parts required if you would like. In the dropdown options, you can select a GR rebuild kit which includes an Truetrac LSD, and gear ratio of your choice, and all new bearings and seals. For ring and pinion, in V160 cars I recommend a 3.25 gear, for the T56 Magnum / GR series transmissions I recommend 4.10 gearing.

I do not recommend using any other gear than Ford Motorsports, as they are the quietest gears made. The ratios they offer are 3.31, 3.55, 3.73 and 4.10

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