Super stock tires

landys car came with 7.75 15s on his 68 hemi dart. from car craft mag,1968 Dodge Dart Hemi in NHRA - Landy's Dart
Rear suspension:
NHRA Super Stock rules forbade postfactory wheeltub and fender tire clearance modifications well into the early '70s. So all Hemi A-Bodies came with special offset spring shackles and hangers, which gained 3/4-inch of sidewall clearance. You can still buy this kit from MP. At present, the Dick Landy car exhibits minitubs, a narrowed axlehousing, and leaf springs moved in-line with the rear frame longitudinals. We say bring it back to stock. The Dana 60 rear axle packs 4.10:1 gears; originally, equipment cogs were 4.88:1 (4.86:1 in automatic cars equipped with the 83/4 rear axle).

Brakes:
While four-piston Kelsey Hayes disc brakes were a regular factory option on '68 A-Bodies, they had the small 5-on-4-inch bolt pattern. Hemi A-Bodies got specific 11-inch Bendix 5-on-4.5-inch-bolt-pattern discs from the fullsize C-Body parts bin. The rear brakes are 10-inch drums with the big car 5-on-4.5-inch bolt pattern to match the front. The master cylinder mounts to a specific 1-inch offset aluminum block to make room for the Hemi. Clearance is so tight, flexible brake hoses connect the master cylinder to the body so the valve cover can be removed for valve lash adjustment without breaking into the hydraulic brake circuit.

Wheels/Tires:
As delivered to the customer, original Hemi Darts came with an unusual blend of 14- and 15-inch rollers: 14x5.5 black steel wheels with D70-14 tires up front and skinny, 7.75x15 tires mounted on oddball 15x6 rims out back. The rear hoops had a ton of inboard offset and look like-but are not the same as-later Dodge Dakota pickup truck rims. Dick Landy was a Cragar S/S man, and that's what Pat has on the car now. The front tires are vintage Goodyear 6.70-15, just like the originals. The slicks are 30x12-15 Goodyears-way bigger than anything ever used on the car. The surviving automatic Dart is not tubbed-let's make it a pair!

Transmission