||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (August 2010)|
|Body and chassis|
|Class||Class 6, 7 & 8, tractor unit|
The International 8000 Series, also known as the International TranStar line, is a regional-haul tractor. It is available in two variants.[when?] They differ in engines, drivetrains, and axle configurations.
|This section is outdated. (November 2012)|
The 8500 model has a wheelbase from 128 to 201 in (3.3 to 5.1 m), is powered by an International HT 570. Its front axle capacity is 10,000 lb (4,500 kg) or 12,000 lb (5,400 kg). Rear single axle has a capacity of 23,000 pounds (10,000 kg). Rear tandem axle has a capacity of 40,000 lb (18,000 kg). Both axles are either Meritor or Dana Spicer and are available with a driver-controlled locking differential. Applications include beverage, city tractor, and regional haul.
The heavier-duty 8600 model has a wheelbase from 128 to 315 inches (3.25 to 8.00 m), is powered by either a Caterpillar or Cummins diesel. Its front axle is either a Meritor with a capacity of 10,000 lb (4,500 kg), 12,000 lb (5,400 kg), or 13,200 lb (6,000 kg) or a Dana Spicer with a capacity of 10,000 lb (4,500 kg), 12,000 lb (5,400 kg), 13,200 lb (6,000 kg), or 14,000 lb (6,400 kg). Rear single axle capacity is 23,000 lb (10,000 kg). Rear tandem axle capacity is 40,000 lb (18,000 kg). Both axles are either Meritor or Dana Spicer and are available with a driver-controlled locking differential. Applications include beverage, city tractor, liquid or dry bulk, and regional haul. 
The predecessor of the first Transtar was the 1965-68 CO-4000 (which was replacing the DCO-400 Emeryville). In 1968, the company unveiled the Transtar, also known as CO/COF-4070A and as COF-4090A (with a raised cab).
An all wheel drive model was made on the Transtar basis from 1970 to 1972: the Unistar, or Universal four wheel drive with no transfer case. This truck has a modified grille, bumper, and front corner design.
The Transtar was replaced in mid 1974 by the Transtar II, a.k.a CO/COF-4070B.
Engines and transmissions
- Detroit Diesel inline 6 cylinder, RoadRanger 10 Speed.
- Detroit diesel v-12, RoadRanger 15 Speed overdrive.
Note: References for this section are the same as for Variants
-  International Trucks website- 8500
-  International Trucks website- 8600
- "International Transtar Photo Lineage from Doug McKenzie". Retrieved 2011-12-29.
- C13 ACERT
- Cummins ISM